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| 1 | Are humic substances soil microbial residues or unique synthesized compounds?A perspective on their distinctiveness显示文摘Humic substances(HS),which are defined as a series of highly acidic,relatively high-molecular-weight,and yellow to black colored substances formed during the decay and transformation of plant and microbial remains,ubiquitously occur in nature.Humic substances represent the largest stable organic carbon pool in terrestrial environments and are the central characteristic of the soil.However,the validity of the HS concept and the justification of their extraction procedure have been recently debated.Here,we argue that the traditional humic paradigm is still relevant.Humic substances are distinctive and complex because the extracted HS formed during the humification are chemically distinct from their precursors and are heterogeneous among soils.By reviewing the concept,formation pathways,and stabilization of HS,we propose that the key question facing soil scientists is whether HS are soil microbial residues or unique synthesized compounds.Without revealing the distinctiveness of HS,it is impossible to address this question,as the structure,composition,and reactivity of HS are still poorly known owing to the heterogeneity and geographical variability of HS and the limits of the currently available analytical techniques.In our view,the distinctiveness of HS is fundamental to the soil,and thus further studies should be focused on revealing the distinctiveness of HS and explaining why HS hold this distinctiveness. | Sen DOU Jun SHAN Xiangyun SONG Rui CAO Meng WU Chenglin LI Song GUAN | 2020 | Pedosphere2020，30，2： | 12 |
| 2 | Sorption of Eu(Ⅲ) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques显示文摘Bentonite has been extensively studied because of its strong sorption ability and low permeability.In this work,the Na-bentonite from Gaomiaozi County (China) has been characterized by XRD,FTIR and acid-base titration.The sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01 mol/L NaClO4 solution.The effects of pH,HA,contact time and initial Eu(III) concentrations were also investigated.The results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH values.The presence of HA had little effect on Eu(III) sorption at low pH values,but decreased Eu(III) sorption at high pH values.X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite hybrids.The re- sults indicate that Eu(III) was bound to O atoms at a distance of about 2.39 at pH 4.15.The results are crucial for the evalua- tion of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials. | HU Jun1,2,XIE Zhi3,HE Bo3,SHENG GuoDong1,CHEN ChangLun1,LI JiaXing1,CHEN YiXue2 & WANG XiangKe1 1Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China 2School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China 3National Synchrotron Radiation Laboratory,University of Science & Technology of China,Hefei 230029,China | 2010 | Science China Chemistry2010，53，6： | 12 |
| 3 | Effects of urea enhanced with different weathered coal-derived humic acid components on maize yield and fate of fertilizer nitrogen显示文摘Humic acid(HA) is a readily available and low-cost material that is used to enhance crop production and reduce nitrogen(N) loss. However, there is little consensus on the efficacy of different HA components. In the current study, a soil column experiment was conducted using the ^(15)N tracer technique in Dezhou City, Shandong Province, China, to compare the effects of urea with and without the addition of weathered coal-derived HA components on maize yield and the fate of fertilizerderived N(fertilizer N). The HA components were incorporated into urea by blending different HA components into molten urea to obtain the three different types of HA-enhanced urea(HAU). At harvest, the aboveground dry biomass of plants grown with HAU was enhanced by 11.50–21.33% when compared to that of plants grown with U. More significantly, the grain yields under the HAU treatments were 5.58–18.67% higher than the yield under the urea treatment. These higher yields were due to an increase in the number of kernels per plant rather than the weight of individual kernels. The uptake of fertilizer N under the HAU treatments was also higher than that under the urea treatment by 11.49–29.46%, while the unaccounted N loss decreased by 12.37–30.05%. More fertilizer-derived N was retained in the 0–30 cm soil layer under the HAU treatments than that under the urea treatment, while less N was retained in the 30–90 cm soil layer. The total residual amount of fertilizer N in the soil column, however, did not differ significantly between the treatments. Of the three HAU treatments investigated, the one with an HA fraction derived from extraction with pH values ranging from 6 to 7, resulted in the best improvement in all assessment targets. This is likely due to the abundance of the COO/C–N=O group in this HA component. | ZHANG Shui-qin YUAN Liang LI Wei LIN Zhi-an LI Yan-ting HU Shu-wen ZHAO Bing-qiang | 2019 | Journal of Integrative Agriculture2019，18，3： | 11 |
| 4 | Synthesis of a novel ternary HA/Fe-Mn oxides-loaded biochar composite and its application in cadmium(Ⅱ) and arsenic(Ⅴ) adsorption显示文摘Cadmium (Cd) and arsenic (As) are two of the most toxic elements.However,the chemical behaviors of these two elements are different,making it challenging to utilize a single adsorbent with high adsorption capacity for both Cd(Ⅱ) and As(Ⅴ) removal.To solve this problem,we synthesized HA/Fe-Mn oxides-loaded biochar (HFMB),a novel ternary material,to perform this task,wherein scanning electron microscopy (SEM) combined with EDS (SEM-EDS) was used to characterize its morphological and physicochemical properties.The maximum adsorption capacity of HFMB was 67.11 mg/g for Cd(Ⅱ) and 35.59 mg/g for As(Ⅴ),which is much higher compared to pristine biochar (11.06 mg/g,0 mg/g for Cd(Ⅱ) and As(Ⅴ),respectively).The adsorption characteristics were investigated by adsorption kinetics and the effects of the ionic strength and pH of solutions.X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR) revealed that chelation and deposition were the adsorption mechanisms that bound Cd(Ⅱ) to HFMB,while ligand exchange was the adsorption mechanism that bound As(Ⅴ). | Jianhua Guo Changzhou Yan Zhuanxi Luo Hongda Fang Shugang Hu Yinglan Cao | 2019 | Journal of Environmental Sciences2019，31，11： | 10 |
| 5 | Sorption of uranyl ions on TiO_2:Effects of pH,contact time,ionic strength,temperature and HA显示文摘Sorption of U(VI) onto TiO_2 as functions of pH, ionic strength, contact time, soil humic acid(SHA), solid-to-liquid ratio and temperature was studied under ambient conditions using batch and spectroscopic approaches. The sorption of U(VI) on TiO_2 was significantly dependent on pH and ionic strength. The presence of SHA slightly enhanced the sorption of U(VI) on TiO_2 below pH 4.0, while it inhibited U(VI) sorption in the higher pH range. U(VI)sorption on TiO_2 was favored at high temperatures, and the sorption process was estimated to be endothermic and spontaneous. Reduction of U(VI) to lower valent species was confirmed by X-ray photo-electron spectroscopy analysis. It is very interesting to find that U(VI) sorption on TiO_2 was promoted in solutions with higher back-ground electrolyte concentrations. In the presence of U(VI), higher back-ground electrolyte made more TiO_2 particles aggregate through(001) facets, leading more(101) facets to be exposed. Therefore, the reduction of U(VI) was enhanced by the exposed(101) facets and more U(VI) removal was observed. | Jingjing Wang Bihong He Xiaoyan Wei Ping Li Jianjun Liang Shirong Qiang Qiaohui Fan Wangsuo Wu | 2019 | Journal of Environmental Sciences2019，31，1： | 7 |
| 6 | Study on correlation between humic acid and selenium in Kaschin-Beck disease areas显示文摘The relationship between humic acid and selenium content was studied in this research. The results of calculation showed that there is more humic acid and less selenium in Kaschin-Beck disease areas in China. Fulvic acid in soil could increase selenium level in plants. The chemical bonding between humic acid and selenium was observed with an I.R. spectroscope. It was remarkable for the changes of absorption peak and frequency in 1100-1000 cm-1, 900-700 cm-1. | Zhang Xuelin, Ren Shufen, Li Wencheng,Wang Wensheng, Wang Jinda, Wang Wenjun,and Zhang Yuxiachangchun Institute of Geography,Chinese Academy of Sciences,Changchun,China | 1991 | Journal of Environmental Sciences1991，3，4： | 5 |
| 7 | Redox-active humics support interspecies syntrophy and shift microbial community显示文摘The network of microbial electron transfer can establish a syntrophic association of microbes by connecting interspecies metabolisms, and a variety of redox-active shuttles in environment have been proved to accelerate the electron flow in a microbial community. Using humic substances as models, we investigated how different redox-active shuttles with different electrochemical properties influence interspecies electron transfer, and affect the shift of microbial communities. The co-culture of two species was constructed with supplements of humics, and the electron transfer between these two strains was found to be linked by humic acid with a wider window of redox potential and multi-peaks of redox reactions. Based on the shift of microbial composition, the humic substances with a wide potential window and multi-peaks of redox reactions for accepting and donating electrons could increase the biodiversity(Chao 1 and phylogenetic diversity) with a large extent. The mechanism by which redox-active shuttles mediate the microbial electron transfer network could facilitate our understanding of syntrophic interactions between microbes. | ZHENG Yue KAPPLER Andreas XIAO Yong YANG Fan MAHADEVA Gurumurthy Dummi ZHAO Feng | 2019 | Science China(Technological Sciences)2019，62，10： | 5 |
| 8 | Biochemical changes in grape rootstocks resulted from humic acid treatments in relation to nematode infection显示文摘Objective:To investigate the effect of humic acid on nematode infected,resistant and susceptible grapes in relation to lipid peroxidation and antioxidant mechanisms on selected biochemical parameters known as proactive substances.Methods:The grape rootstocks,superior,superior/ freedom and freedom were reacted differently to Meloidogyne incognita and Rotylenchulus reniformis according to rootstock progenitor.Two weeks after inoculation,two commercial products of humic acid were applied at the rate of(2,4 mL or grams/plant) as soil drench.After 4 months,nematode soil populations were extracted and counted.A subsample of roots from each plant was stained and gall numbers,embedded stages per root were calculated,final population, nematode build up(Pf/Pi),average of eggs/eggmass were estimated.Subsamples of fresh root of each treatment were chemically analyzed.Results:Freedom reduced significantly the nematode criteria and build up.Humic acid granules appeared to be more suppressive to nematode build up on superior and the higher dose on superior/freedom than liquid treatments.On freedom,all treatments reduced significantly the nematode build up regardless to the material nature.The higher dose was more effective than the lower one.As a result of humic acid applications,the malondialdehyde(MDA) and H_2O_2 contents were significandy reduced after humic acid treatments while the antioxidant compounds glutathione(GSH),ascorbic acid(ASA) and total phenol contents were significandy increased when compared with check.Antioxidant defense enzymes ascorbate peroxidase(AFX),superoxide dismutase(SOD),catalase(CAT) and polyphenol oxidase(PPO) showed significant increase in their specific activities in treated plants compared with nematode treated check.Conclnsions:Humic acid treatments improve we yield of grape by increasing the contents of antioxidant compounds and the specific activities of antioxidant enzymes. | Hosny H Kesba Hossam S El-Beltagi | 2012 | Asian Pacific Journal of Tropical Biomedicine2012，2，4： | 4 |
| 9 | Using humic acid for remediation of sandy soils contaminated by heavy metal显示文摘This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). Distribution of amount of Cr (VI) in the aqueous or solid system containing humic acid and sandy soil, was studied using batch experiments, es-pecially for effects of reaction time, pH, concentrations, temperature and irradiation on the reduction of Cr (VI), and the optimum reaction conditions. The results indicated a significant increase of the adsorption of Cr (VI) because of the complexion reaction between HA and Cr (VI) that occurred under acidic condition. The reaction mechanisms of HA with chromium on sand surfaces were certified. Thus it came to a conclusion that HA could be used effectively on remediation of Cr (VI)-contaminated soil and groundwater in a wide range of pH, with or without sunlight. These results suggest that the organic-inorganic complex-such as sandy soils coated with humic substances-is important as a metal reservoir in the environment. | YaJun Wang 1, HongLang Xiao 1, JinXi Wang 2, Yong Wang 3 1. Heihe Key Laboratory of Ecohydrology and River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China. 2. School of Chemical Engineering, Gansu Lian He University, Lanzhou, Gansu 730000, China. 3. Yantai Institute of Coastal Zone Research for Sustainable Development,Chinese Academy of Sciences, Yantai, Shandong 264003, China. | 2009 | Research in Cold and Arid Regions2009，1，3： | 3 |
| 10 | Visible-light-driven photocatalytic inactivation of bacteriophage f2 by Cu-TiO_2 nanofibers in the presence of humic acid显示文摘Pathogenic viruses in drinking water are great threats to public health. Visible-lightdriven photocatalysis is a promising technology for virus inactivation. However, the existing photocatalytic antiviral research studies have mostly been carried out in single-component systems, neglecting the effect of natural organic matter, which exists widely in actual water bodies. In this paper, electrospun Cu-TiO2 nanofibers were prepared as photocatalysts, and their photocatalytic antiviral performance in the presence of humic acid(HA) was comprehensively studied for the first time. The properties of the reaction mixture were measured during the reaction. In addition, the safety, reliability and stability of photocatalytic disinfection in the mixed system were evaluated. The results showed that the virus removal efficiency decreased with the increase of the HA concentration. The type of reaction solution, such as PBS buffer solution or water, did not affect the removal efficiency noticeably. Under acidic conditions, the electrostatic forces between photocatalysts and viruses were strengthened, leading to higher virus removal efficiency. As the reaction time went on, the pH value in the solution increased first and then tended to be stable, the conductivity remained stable, and the dissolved oxygen increased first and then decreased. The safety test showed that the concentration of Cu ions released into the solution was lower than specified by the international standards. No photoreactivation was observed, and the addition of HA significantly reduced the reutilization efficiency of the photocatalysts. | Rong Cheng Mi Kang Zhi-peng Shen Lei Shi Xiang Zheng | 2019 | Journal of Environmental Sciences2019，31，3： | 2 |
| 11 | Adsorption kinetics,isotherm,and thermodynamic studies of adsorption of pollutant from aqueous solutions onto humic acid显示文摘In the present study,humic acid was used as an adsorbent for the investigation of the adsorption kinetics,isotherms,and thermo-dynamic parameters of hexavalent chromium from aqueous solution at varying pH,temperatures,and concentrations.Adsorption isotherms and equilibrium adsorption capacities were determined by the fittings of the experimental data to three well-known iso-therm models:Langmuir,Freundlich,and Redlich-Peterson.The results showed that the Langmuir and Redlich-Peterson models appear to fit the adsorption better than did the Freundlich adsorption model for the adsorption of chromium onto humic acid.The equilibrium constants were used to calculate thermodynamic parameters such as the change of free energy,enthalpy,and entropy.The derived adsorption constants (logaL) and their temperature dependencies from Langmuir isotherm have been used to calculate the corresponding thermodynamic quantities such as the free energy of adsorption,heat,and entropy of adsorption.The thermo-dynamic data indicate that Cr (VI) adsorption onto humic acid is entropically driven and characterized by physical adsorption. | YaJun Wang,HongLang Xiao,Fang Wang Heihe Key Laboratory of Ecohydrology and River Basin Science,Cold and Arid Regions Environmental and Engineering Re-search Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China. | 2009 | Research in Cold and Arid Regions2009，1，4： | 2 |
| 12 | A new hypothesis for the etiology of Kaschin-Beck disease显示文摘Kaschin-Beck disease (KBD) could be exogeneous free radical induced endemic osteoarthropathy under conditions of lacking necessary antioxidant defences.especially selenium-cored defence in Chinese eco-en-vironment. Experimental evidences have been provided for the internal relations among previously suggested pathologic factors, i.e., selenium deficiency, organic matters of drinking waterand mycotoxins from contaminated grains, based on the facts that the former is a preventory factor while the others are exogenous freeradical carriers. ESR spectrum shows that these exogenous free radical carriers have a property of semi-quinone compounds and are toxic in in-vitro cartilage cell culture and animal tests in inducing lipid peroxidation process. | Peng An, Wang Zijian, Wang Wenhua and Yang Chunlinresearch Centre for Eco-Environmental Sciences.Chinese Academy of Sciences,Beijing 100083,China | 1991 | Journal of Environmental Sciences1991，3，4： | 1 |
| 13 | Ozonation as an efficient pretreatment method to alleviate reverse osmosis membrane fouling caused by complexes of humic acid and calcium ion显示文摘Humic acid has been considered as one of the most significant sources in feed water causing organic fouling of reverse osmosis (RO) membranes, but the relationship between the fouling behavior of humic acid and the change of its molecular structure has not been well developed yet. In this study, the RO membrane fouling behavior of humic acid was studied systematically with ozonation as a pretreatment method to control RO membrane fouling. Furthermore, the effect of ozone on the structure ofhumic acid was also explored to reveal the mechanisms. Humic acid alone (10-90 mg/L, in deionized water) was found not to cause obvious RO membrane fouling in 45-h operation. However, the presence of Ca^2+ aggravated significantly the RO membrane fouling caused by humic acid, with significant flux reduction and denser fouling layer on RO membrane, as it was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). However, after the pretreatment by ozone, the influence of Ca^2+ was almost eliminated. Further analysis revealed that the addition of Ca^2+ increased the particle size of humic acid solution significantly, while ozonation reduced the SUVA254, particle size and molecular weight of the complexes of humic acid and Ca^2+(HA-Ca^2+ complexes). According to these results and literature, the bridge effect of Ca^2+ aggregating humic acid molecules and the cleavage effect of ozone breaking HA-Ca^2+ complexes were summarized. The change of the structure of humic acid under the effect of Ca^2+ and ozone is closely related to the change of its membrane fouling behavior. | Xuehao Zhao Yinhu Wu Xue Zhang Xin Tong Tong Yu Yunhong Wang Nozomu Ikuno Kazuki Ishii Hongying Hu | 2019 | Frontiers of Environmental Science & Engineering2019，13，4： | 1 |
| 14 | Electrokinetic chemical characteristics of humic and dannic acids effecting on the natural water and its coagulation显示文摘Taking streaming current(SC)as the electrokinetic parameter,this paper demon-strated the electrokinetic chemical characteristics of humic and dannic acids(HA and DA)in sus-pensions including turbid water,coagulated water and HA or DA contained water.Accordingly,the studies were carried out for determining the relationship between streaming current and zeta po-tential ζ(expressed by eleetrophoretie mobility EM)in above water conditions.In addition,themechanisms of HA effecting on streaming current within or after coagulant addition and the elec-trokinetic detection principles for HA or DA were also investigated on experiments and theoreticalanalysis.The results indicated that the change of SC like ζ presented meaningful information con-cerning the degree for destabilization of a particulate suspension,and HA or DA in water could re-markably decrease the effect of inorganic coagulant upon streaming current,which is in accordancewith their influence on coagulation. | Qu Jiuhui Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China | 1997 | Journal of Environmental Sciences1997，9，1： | 1 |
| 15 | STUDY ON THE FORMATION OF BLACK PATINA ON BRONZE MIRRORS INDUCED BY HUMIC ACID显示文摘The black patina on some ancient Chinese bronze mirrors is known as 'Black Lacquer Antique'(BLA) or 'Hei-qi-qu', which looks jet-black and shiny. BLA’s were corroded slowly, one of them was about 10-4mm per year in the soil. Many scholars have studied the composition and structure of BLA, but the formation remains obscure. In this paper the formation of BLA on the surface of bronze mirror samples induced by humic acids under different conditions has been studied. | Zhao Zeng MA* Lian Ji JIN Department of Chemistry, University of Science and Technology Beijing, Beijing 100083 | 1993 | Chinese Chemical Letters1993，4，1： | 1 |
| 16 | Performance evaluation of polyamide nanofiltration membranes for phosphorus removal process and their stability against strong acid/alkali solution显示文摘In this study,a quantitative performance of three commercial polyamide nanofiltration(NF) membranes(i.e.,NF,NF90,and NF270) for phosphorus removal under different feed conditions was investigated.The experiments were conducted at different feed phosphorus concentrations(2.5,5,10,and 15 mg·L^-1) and elevated pHs(pH 1.5,5,10,and 13.5) at a constant feed pressure of 1 MPa using a dead-end filtration cell.Membrane rejection against total phosphorus generally increased with increasing phosphorus concentration regardless of membrane type.In contrast,the permeate flux for all the membranes only decreased slightly with increasing phosphorus concentration.The results also showed that the phosphorus rejections improved while water flux remained almost unchanged with increasing feed solution pH.When the three membranes were exposed to strong pHs(pH 1.5 and 13.5) for a longer duration(up to 6 weeks)it was found that the rejection capability and water flux of the membranes remained very similar throughout the duration,except for NF membrane with marginal decrement in phosphorus rejection.Adsorption study also revealed that more phosphorus was adsorbed onto the membrane structure at alkaline conditions(pH 10 and 13.5) compared to the same membranes tested at lower pHs(pH 1.5 and 5).In eonelusion,NF270 membrane outperformed Nf and NF90 membranes owing to its desirable performance of water flux and phosphorus rejection particularly under strong alkali solution.The NF270 membrane achieved 14.0 L·m^-2·h^-1 and 96.5% rejection against 10 mg·L^-1 phosphorus solution with a pH value of 13.5 at the applied pressure of 1 MPa. | Yen Khai Chai How Chun Lam Chai Hoon Koo Woei Jye Lau Soon Onn Lai Ahmad Fauzi Ismail | 2019 | Chinese Journal of Chemical Engineering2019，27，8： | 1 |
| 17 | Effects of Plant-derived Humic Acid Organic Fertilizer on Selenium Content of Rice in Northern Guangxi显示文摘This study was to find out the suitable application amount of plant-derived humic acid organic fertilizer for selenium-rich rice production in northern Guilin area by applying the fertilizer at different amounts.The results showed that plant-derived humic acid organic fertilizer could effectively activate selenium in selenium-rich soil,and then promote the uptake of selenium by rice.With costs,selenium enrichment and rice yield as the main evaluation indicators,A4 was chosen as the best treatment,that is,the application of 4 500 kg/hm^2 of plant-derived humic acid organic fertilizer as base fertilizer could achieve the best benefit. | Yunwei JIANG Lixiu HUANG Dongmei WANG Liping PAN Qianchi MO Ri MING Zongji ZHANG Jinping CHEN Hengzhi ZHAO Youxing YANG Xiongying JIANG Dayong FAN Yongxian LIU | 2019 | Agricultural Biotechnology2019，8，3： | 1 |
| 18 | Effects of Nano-carbon Humic Acid Water-retaining Fertilizer on Citrus Growth and the Soil Bacterial Community in Citrus Field显示文摘[Objective] In order to reveal the effects of reducing the amount of novel nano-carbon humic acid water-retaining fertilizer(CSF) on soil microbial community structure and citrus growth. [Method]In this study,conventional fertilization was as the control(KC1) in Wanzhou citrus orchard of Three Gorges Reservoir area. CSF reductions by 0%(KC2),10%(KC3),20%(KC4),30%(KC5) and 40%(KC6) were used to analyze the changes of soil bacterial community structure,citrus yield and quality. [Result]The results showed that the observed species,Shannon index,Chao1 index and PD_whole_tree of KC6 were higher than those of KC1,and were the same as KC2. The abundance of Xanthomonadaceae was the highest in KC5. Compared with KC1,the Xanthomonadaceae in KC3,KC4 and KC6 was significantly decreased,and the levels of Nitrosomonadaceae and Pseudomonasaceae were higher than that of KC1 after the treatment of KC6. Sphingomonas in different reduction treatments was lower than that of KC1,but Burkholderia and Pseudomonas were significantly higher than those of KC1. It was found that the similarity among treatments was small after bacterial community similarity clustering analysis,and citrus yield increased somewhat after CSF fertilization reduction.When CSF fertilization reduced by 30%,citrus yield increased by 4. 50%. When CSF fertilization reduced by 40%,citrus yield decreased by4. 14%. After CSF fertilization,citrus quality did not change significantly in CSF conventional fertilization and reduction of 10% and 40%,while significantly decreased in 20% and 30% of fertilization reduction. [Conclusion] CSF fertilization reduction changed the diversity of soil bacterial community structure and the yield and quality of citrus. | Men Shuhui Ding Fangjun Zhang Hong Ke Chao Zhang Shiwei Huang Zhanbin | 2018 | Meteorological and Environmental Research2018，9，6： | 1 |
| 19 | Phosphorus release from vivianite and hydroxyapatite by organic and inorganic compounds显示文摘Based on recent mining rates and the exhaustion of global phosphorus(P)reserves,there is a need to mobilize P already stored in soils,and its recovery from secondary resources such as Ca-and Fe-phosphates is important.The Ca-phosphate hydroxyapatite forms a good fertilizer source,while vivianite is formed in waterlogged soils and sediments.During sludge treatment,the formation of vivianite has been identified,being mainly Fe-phosphate.Long-term P release from both hydroxyapatite and vivianite was studied using different inorganic(CaCl2 and CaSO4)and organic(citric and humic acid)reagents during batch experiments.Reagents CaCl2 and CaSO4 represent the soil solution,while citric and humic acids as organic constituents affect P availability in the rhizosphere and during the process of humification.Additionally,the flow-through reactor(FTR)technique with an infinite sink was used to study the long-term P release kinetics.The cumulative P release was higher by organic acids than by inorganic compounds.The cumulative P release rates were higher in the FTR with CaCl2 as compared to the batch technique.The infinite sink application caused a continuously high concentration gradient between the solid and liquid phases,leading to higher desorption rates as compared to the batch technique.The predominant amount of the total P released over time was available for a short term.While inorganic anion exchange occurred at easily available binding sites,organic acids affected the more heavily available binding sites,which could be embedded within the mineral structure.The results showed that organic compounds,especially citric acid,play a superior role as compared to the inorganic constituents of the soil solution during the recovery of already stored P from the tertiary phosphates vivianite and hydroxyapatite. | Stella GYPSER Dirk FREESE | 2020 | Pedosphere2020，30，2： | 0 |
| 20 | Theoretical Researches on the Charge Transport Properties of Humic Acid Coordinating with Fe^(3+)\Cu^(2+)\Al^(3+) Metal Ions显示文摘Humic acid is a key component of extracellular electron acceptor. Experimental study elucidates that humic acid molecular ligand with different metal elements has different abilities to accept electrons. By using density functional theory, this article selected the leonardite humic acid(LHA) organic macromolecule as ligand to study interactions between the ligand and different metals. At the same time, the calculation of binding energy, the analysis of characteristics for the complex structure and the distribution of frontier molecular orbital were also completed. On the basis of Marcus theory, the reorganization energy, matrix element and charge transport rate constant were calculated. The results show that the order of the charge transfer rates is Fe^(3+)>Cu^(2+)>Al^(3+) for different metal complexes, and are in good agreement with the experimental ones. | 罗惠 陈晓 刘柳斜 张明 李来才 田安明 | 2019 | Chinese Journal of Structural Chemistry2019，38，3： | 0 |
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