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| 1 | 小麦/蚕豆,玉米/蚕豆和小麦/玉米间作对根际细菌群落结构的影响显示文摘利用PCR-DGGE技术研究了小麦/蚕豆、玉米/蚕豆和小麦/玉米间作对作物根际细菌群落结构的影响。结果表明:间作能够提高作物根际细菌群落多样性、改变根际细菌群落结构组成。其中,小麦/蚕豆间作对根际细菌群落结构的影响最为突出,作物花期时小麦/蚕豆间作显著提高和改变两种作物根际细菌多样性和群落结构组成。玉米/蚕豆间作主要表现出对苗期玉米根际细菌多样性的显著提高和群落结构组成的改变。小麦/玉米间作对作物根际细菌群落结构的影响程度较弱。同时,3种间作体系都具有不同程度的产量优势。结果证明了间作体系中地上部植物多样性与地下部微生物多样性存在紧密联系。 | 宋亚娜 MARSCHNER Petra 张福锁 包兴国 李隆 | 2006 | 生态学报2006，26，7： | 88 |
| 2 | Sorption of Water-Extractable Organic Carbon in Various Clay Subsoils: Effects of Soil Properties显示文摘Clay-rich subsoils are added to sandy soils to improve crop yield and increase organic carbon(C) sequestration; however, little is known about the influence of clay subsoil properties on organic C sorption and desorption. Batch sorption experiments were conducted with nine clay subsoils with a range of properties. The clay subsoils were shaken for 16 h at 4?C with water-extractable organic C(WEOC, 1 224 g C L^(-1)) from mature wheat residue at a soil to extract ratio of 1:10. After removal of the supernatant, the residual pellet was shaken with deionised water to determine organic C desorption. The WEOC sorption was positively correlated with smectite and illite contents, cation exchange capacity(CEC) and total organic C, but negatively correlated with kaolinite content. Desorption of WEOC expressed as a percentage of WEOC sorbed was negatively correlated with smectite and illite contents, CEC, total and exchangeable calcium(Ca) concentrations and clay content, but positively correlated with kaolinite content. The relative importance of these properties varied among soil types. The soils with a high WEOC sorption capacity had medium CEC and their dominant clay minerals were smectite and illite. In contrast, kaolinite was the dominant clay mineral in the soils with a low WEOC sorption capacity and low-to-medium CEC. However, most soils had properties which could increase WEOC sorption as well as those that could decrease WEOC sorption. The relative importance of properties increasing or decreasing WEOC sorption varied with soils. The soils with high desorption had a low total Ca concentration, low-to-medium CEC and low clay content, whereas the soils with low desorption were characterised by medium-to-high CEC and smectite and illite were the dominant clay minerals. We conclude that WEOC sorption and desorption depend not on a single property but rather a combination of several properties of the subsoils in this study. | Trung Ta NGUYEN Petra MARSCHNER | 2016 | Pedosphere2016，26，1： | 5 |
| 3 | Plant growth and soil microbial community structure of legumes and grasses grown in monoculture or mixture显示文摘A greenhouse pot experiment was conducted to investigate the in?uence of soil moisture content on plant growth and the rhizosphere microbial community structure of four plant species (white clover, alfalfa, sudan grass, tall fescue), grown individually or in a mixture. The soil moisture content was adjusted to 55% or 80% water holding capacity (WHC). The results indicated that the total plant biomass of one pot was lower at 55% WHC. At a given soil moisture, the total plant biomass of white clover and tall fescue in the mixture was lower than that in a monoculture, indicating their poor competitiveness. For leguminous plants, the decrease in soil moisture reduced the total microbial biomass, bacterial biomass, fungal biomass, and fungal/bacterial ratio in soil as assessed by the phospholipid fatty acid analysis, whereas, lower soil moisture increased those parameters in the tall fescue. The microbial biomass in the soil with legumes was higher than that in the soil with grasses and the two plant groups di?ered in soil microbial community composition. At high soil moisture content, microbial communities of the plant mixture were similar to those of the legume monoculture, and the existence of legumes in the mixture enhanced the bacterial and fungal biomass in the soil compared to the grasses grown in the monoculture, indicating that legumes played a dominant role in the soil microbial community changes in the plant mixture. | MARSCHNER Petra | 2008 | Journal of Environmental Sciences2008，20，10： | 5 |
| 4 | Clay Addition to Sandy Soil Influence of Clay Type and Size on Nutrient Availability in Sandy Soils Amended with Residues Differing in C/N ratio显示文摘Addition of clay-rich subsoil to sandy soil results in heterogeneous soil with clay peds(2-mm) or finely ground(< 2 mm) clay soil(FG), which may affect the nutrient availability. The aim of this study was to assess the effect of clay soil particle size(FG or peds)and properties on nutrient availability and organic C binding in sandy soil after addition of residues with low(young kikuyu grass,KG) or high(faba bean, FB) C/N ratio. Two clay soils with high and low smectite percentage, clay and exchangeable Fe and Al were added to a sandy soil at a rate of 20%(weight/weight) either as FG or peds. Over 45 d, available N and P as well as microbial biomass N and P concentrations and cumulative respiration were greater in soils with residues of KG than FB. For soils with KG residues,clay addition increased available N and initial microbial biomass C and N concentrations, but decreased cumulative respiration and P availability compared to sandy soil without clay. Differences in measured parameters between clay type and size were inconsistent and varied with time except the increase in total organic C in the < 53 μm fraction during the experiment, which was greater for soils with FG than with peds. We concluded that the high exchangeable Fe and Al concentrations in the low-smectite clay soil can compensate a lower clay concentration and proportion of smectite with respect to binding of organic matter and nutrients. | Shermeen TAHIR Petra MARSCHNER | 2017 | Pedosphere2017，27，2： | 4 |
| 5 | Influence of salinity and water content on soil microorganisms显示文摘Salinization is one of the most serious land degradation problems facing world.Salinity results in poor plant growth and low soil microbial activity due to osmotic stress and toxic ions.Soil microorganisms play a pivotal role in soils through mineralization of organic matter into plant available nutrients.Therefore it is important to maintain high microbial activity in soils.Salinity tolerant soil microbes counteract osmotic stress by synthesizing osmolytes which allows them to maintain their cell turgor and metabolism.Osmotic potential is a function of the salt concentration in the soil solution and therefore affected by both salinity(measured as electrical conductivity at a certain water content)and soil water content.Soil salinity and water content vary in time and space.Understanding the effect of changes in salinity and water content on soil microorganisms is important for crop production,sustainable land use and rehabilitation of saline soils.In this review,the effects of soil salinity and water content on microbes are discussed to guide future research into management of saline soils. | Nan Yan Petra Marschner Wenhong Cao Changqing Zuo Wei Qin | 2015 | International Soil and Water Conservation Research2015，3，4： | 3 |
| 6 | Soil Respiration, Microbial Biomass and Nutrient Availability in Soil After Addition of Residues with Adjusted N and P Concentrations显示文摘Microbial activity and nutrient release are known to be influenced by organic matter properties,but it is difficult to separate the effect of C/N ratio from that of C/P ratio because in most plant residues both ratios are either high or low.An incubation experiment was conducted to investigate the effects of reducing the C/N and C/P ratios of slowly decomposable plant residues(young eucalyptus leaves,mature wheat straw,and sawdust) to those of rapidly decomposable residues(young kikuyu shoots) on soil respiration,microbial biomass,and N and P availability.The C/N and C/P ratios of the former were adjusted to 15 and 89,respectively,by adding N as(NH_4)_2SO_4,P as KH_2PO_4 or both and residues were added at 10 g C kg-1 to a silt loam.Soil respiration was measured over21 d;microbial biomass C(MBC) and available N and P were measured on days 0,7,and 21.Compared to the unamended soil,addition of kikuyu increased cumulative respiration 20-fold,MBC concentration 4 to 8-fold,and available P concentration up to4-fold,whereas the increase in available N concentration was small and transient.Cumulative respiration and MBC concentration were low in the sawdust-amended soil and were not influenced by reducing the C/N and C/P ratios.Cumulative respiration with original wheat and eucalyptus was 30%-40%of that with kikuyu.Reducing the C/N ratio alone or both C/N and C/P ratios increased cumulative respiration and MBC concentration 2-fold compared to the original wheat and eucalyptus,whereas reducing the C/P ratio had little effect.Throughout the experiment,the available N concentration after addition of residues with reduced C/N ratio increased in the following order of eucalyptus < wheat < sawdust.By independently lowering the C/N and C/P ratios,microbial activity was more limited by C and N than P.However,lowering the C/N ratio of very slowly decomposable sawdust had no effect on soil respiration and MBC concentration,suggesting that other properties such as concentration of poorly decomposable C compounds limited decomposition. | Trung Ta NGUYEN Petra MARSCHNER | 2017 | Pedosphere2017，27，1： | 3 |
| 7 | Structure and function of the soil microbial community in a long-term fertilizer experiment显示文摘 | Petra Marschner Ellen Kandeler Bernd Marschner | 2003 | Soil Biology and Biochemistry2003，，3： | 2 |
| 8 | Phosphorus and nitrogen in the soil interface between two plant residues differing in C/nutrient ratio:A short-term laboratory incubation study显示文摘In studies on the effects of mixing residues with different properties on decomposition rate and nutrient release,the extent of contact between the different residues is not known.In this study,we used an experimental design where crop residues were spatially separated by a layer of soil.Microcosms were set up using young faba bean residue(low carbon(C)/nutrient ratio,L)and mature barley straw(high C/nutrient ratio,H).The microcosms comprised of two caps of PVC tubes,each filled with moist soil.Between the two caps,there were three layers each separated from the others by fine nylon mesh with the middle layer being the moist interface soil.Microcosms had similar(H/H or L/L)or different(L/H)residue types,or only residue type(H/S or L/S)while the other cap had no residue.In treatments with only one residue,measured parameters,except microbial biomass P(MBP),were higher in L/S than H/S.In treatments with two residues,all parameters were lowest in H/H.In L/H compared to L/L after 14 days,available P and microbial biomass N(MBN)were lower,available N was similar and MBP was higher.After 28 days,available P and N were lower in L/H than L/L,but MBP and MBN did not differ.In L/H,measured resin P,MBP and MBN were higher than expected whereas available N was lower.The experimental design used in this study allows assessing the effect of residues on properties of the soil between them. | Kehinde O.Erinle Petra Marschner | 2020 | Soil Ecology Letters2020，2，3： | 1 |
| 9 | Structure and function of the soil microbial community in a long-term fertilizer experiment显示文摘 | Petra Marschner Ellen Kandeler Bernd Marschner | 2003 | Soil Biology and Biochemistry2003，，3： | 1 |
| 10 | Phosphorus uptake and rhizosphere properties of intercropped and monocropped maize, faba bean, and white lupin in acidic soil显示文摘 | Haigang Li Jianbo Shen Fusuo Zhang Petra Marschner Greg Cawthray Zed Rengel | 2010 | Biology and Fertility of Soils2010，，2： | 1 |
| 11 | Addition of organic and inorganic P sources to soil – Effects on P pools and microorganisms显示文摘 | Muhammad Asghar Malik Petra Marschner Khalid Saifullah Khan | 2012 | Soil Biology and Biochemistry2012，，： | 1 |
| 12 | Root exudation and physiological status of a root-colonizing fluorescent pseudomonad in mycorrhizal and non-mycorrhizal pepper (Capsicum annuum L.)显示文摘 | Petra Marschner David E. Crowley Richard M. Higashi | 1997 | Plant and Soil1997，，1： | 1 |
| 13 | Residue chemistry and microbial community structure during decomposition of eucalypt, wheat and vetch residues显示文摘 | Karen Baumann Petra Marschner Ronald J. Smernik Jeffrey A. Baldock | 2009 | Soil Biology and Biochemistry2009，，9： | 1 |
| 14 | Soil Respiration, Microbial Biomass C and N Availability in a Sandy Soil Amended with Clay and Residue Mixtures显示文摘Crop yields in sandy soils can be increased by addition of clay-rich soil, but little is known about the effect of clay addition on nutrient availability after addition of plant residues with different C/N ratios. A loamy sandy soil(7% clay) was amended with a clay-rich subsoil(73% clay) at low to high rates to achieve soil mixtures of 12%, 22%, and 30% clay, as compared to a control(sandy soil alone) with no clay addition. The sandy-clay soil mixtures were amended with finely ground plant residues at 10 g kg^(-1): mature wheat(Triticum aestivum L.) straw with a C/N ratio of 68, mature faba bean(Vicia faba L.) straw with a C/N ratio of 39, or their mixtures with different proportions(0%–100%, weight percentage) of each straw. Soil respiration was measured over days 0–45 and microbial biomass C(MBC), available N, and p H on days 0, 15, 30, and 45. Cumulative respiration was not clearly related to the C/N ratio of the residues or their mixtures, but C use efficiency(cumulative respiration per unit of MBC on day 15) was greater with faba bean than with wheat and the differences among the residue mixtures were smaller at the highest clay addition rate. The MBC concentration was lowest in sole wheat and higher in residue mixtures with 50% of wheat and faba bean in the mixture or more faba bean. Soil N availability and soil p H were lower for the soil mixtures of 22% and 30% clay compared to the sandy soil alone. It could be concluded that soil cumulative respiration and MBC concentration were mainly influenced by residue addition, whereas available N and p H were influenced by clay addition to the sandy soil studied. | Sharmistha PAL Petra MARSCHNER | 2016 | Pedosphere2016，26，5： | 1 |
| 15 | Residue chemistry and microbial community structure during decomposition of eucalypt, wheat and vetch residues显示文摘 | Karen Baumann Petra Marschner Ronald J. Smernik Jeffrey A. Baldock | 2009 | Soil Biology and Biochemistry2009，，9： | 1 |
| 16 | Structureand function of the soil microbial community in a long-termfertilizer experiment显示文摘 | Petra Marschnera Ellen Kandeler Bernd Marschner | 2003 | Soil Biology and Biochemistry2003，35，3： | 1 |
| 17 | Root exudation and physiological status of a root-colonizing fluorescent pseudomonad in mycorrhizal and non-mycorrhizal pepper (Capsicum annuum L.)显示文摘 | Petra Marschner David E. Crowley Richard M. Higashi | 1997 | Plant and Soil1997，，1： | 1 |
| 18 | Brassica genotypes differ in growth, phosphorus uptake and rhizosphere properties under P-limiting conditions显示文摘 | Petra Marschner Zakaria Solaiman Zed Rengel | 2006 | Soil Biology and Biochemistry2006，，1： | 1 |
| 19 | Microbial activity and biomass and N and P availability in a saline sandy loam amended with inorganic N and lupin residues显示文摘 | Ahmed Elgharably Petra Marschner | 2011 | European Journal of Soil Biology2011，，5： | 1 |
| 20 | Phosphorus uptake and rhizosphere properties of intercropped and monocropped maize, faba bean, and white lupin in acidic soil显示文摘 | Haigang Li Jianbo Shen Fusuo Zhang Petra Marschner Greg Cawthray Zed Rengel | 2010 | Biology and Fertility of Soils2010，，2： | 1 |
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