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| 1 | The impact of vegetation restoration on erosion-induced sediment yield in the middle Yellow River and management prospect显示文摘According to the characteristics of water and erosion environments of different natural zones on the Loess Plateau, this paper studies changes of vegetation types, distribution boundaries of forest and grass as well as restoration capacity of vegetation in different natural zones in the middle Yellow River. The annual precipitation of 530 mm is the critical annual pre-cipitation for forest and grass distribution in the middle Yellow River. Among the zonal and azonal environmental factors affecting watershed sediment yield, the intermediate diameter D50 (mm) of suspended load and forest coverage (V, %) play the leading role. Of them the effect weight of forest coverage (V, %) on catchments sediment yield is only 3.4% less than the role of the intermediate diameter (D50, mm), they are almost the same. To effectively control soil erosion in semiarid, especially in hilly-gullied areas and make sediment transport modulus reduce to less than 6000 t/km2, it is rather difficult by merely relying on natural restoration of forest. In the process of cultivated land conversion into forest land and grassland, measures suiting local conditions should be adopted in tree species selection and artificial afforestation (grass planting) based on management with biological measures for slopeland and engineering measures for hilly-gullied areas, so that watershed forest coverage in key counties can reach at least over 30%.Compared with the standard period of precipitation prior to the 1960s, with the decrease of an-nual precipitation at various periods, plant productivities decline to different degrees under natural conditions. The main reason accountable for the low survival rate of new seedlings and grass over years is due to precipitation decrease. In light with regression models of annual pre-cipitation and natural vegetation productivities, it is possible to obtain estimated values of wa-tershed natural vegetation productivity and eco-water consumption needed for the restoration to the standard period respectively for the present time or arbitrary period since the 1970s, thus providing a scientific basis for forest and grassland restoration in the middle Yellow River and the management prospect. | CHEN Hao1, ZHOU Jinxing2, CAI Qiangguo1, YUE Zhongqi3, LU Zhongchen4, LIANG Guanglin1& HUANG Jianguo5 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Re-search, Chinese Academy of Sciences, Beijing 100101, China 2. Institute of Forestry, Chinese Academy of Forestry Sciences, Beijing 100091, China 3. Department of Civil Engineering, University of Hong Kong, Hong Kong, China 4. Eco-environmental Research Center, Chinese Academy of Sciences, Beijing 100085, China 5. College of Resources and Environment, Southwest Agricultural University, Chongqing 400716, China Correspondence should be addressed to Chen Hao | 2005 | Science China Earth Sciences2005，48，6： | 7 |
| 2 | Pseudomonas aeruginosa pyocyanin causes airway goblet cell hyperplasia andmetaplasia and mucus hypersecretion by inactivating the transcriptional factorFoxA2显示文摘 | HAO Y KUANG Z WALLING BE | 2011 | Cell Microbiol2011，14，3： | 1 |
| 3 | A hybrid LDA and genetic algorithm for gene se lection and classification of microarray data显示文摘 | Edmundo BonillaHuerta Be' a trice Duval Jin-Kao Hao | 2010 | Neuro computing2010，，73： | 1 |
| 4 | Organization of serpin gene-1 from Mandeca sexta 显示文摘 | Hao Be Jiang Yang Wang Yanling | 1996 | Biol Chem1996，271，28： | 1 |
| 5 | Pseudomonas aeruginosa pyocyanin causes airway goblet cell hyperplasia and metaplasia and mucus hypersecretion by inactivating the transcriptional factor FoxA2显示文摘 | Hao Y Kuang Z Walling BE Bhatia S Sivaguru M Chen Y Gaskins HR Lau GW | | 0，，： | 1 |
| 6 | Investigation of solvatochromism and aggregation behavior of C_(60)(C_4H_(10)N^+)I^- in binary solvent mixtures显示文摘Water-soluble N,N-dimethyl[60]fulleropyrro-lidinium iodide (C60(C4H10N+)I-), when dissolved in binarymixtures of tetrahydrofuran and water, was found to exhibit remarkable solvatochromism. Correspondingly, the UV-vis spectra showed obvious changes by variation of the solventcomposition of tetrahydrofuran and water. It was found that both concentration and temperature had strong influence on the stability of monomer-state C60(C4H10N+)I-, while theyhad little effect on the stability of aggregated C60(C4H10N+) I-The formation of cluster was confirmed by TEM and AFMmeasurements. | WANG Guanwu1, HAO Erhong1, JIAO Lijuan1 & YAN Lifeng2 1. Department of Chemistry, University of Science and Technology ofChina, Hefei 230026, China 2. Department of Chemical Physics, University of Science and Technol-ogy of China, Hefei 230026, China Correspondence should be addressed to Wang Guanwu (e-mail: gwang @ustc.edu.cn) | 2003 | Chinese Science Bulletin2003，48，18： | 1 |
| 7 | Pseudomonas aeruginosa elastase provides an escape from phagocytosis by degrading the pulmonary surfactant protein-A 显示文摘 | Kuang Z Hao Y Walling BE | 2011 | PLoS One2011，6，27： | 1 |
| 8 | Antitumor activity and immune enhancement of murine interleukin-23 expressed in murine colon carcinoma cells显示文摘 | Shan BE Hao JS Li QX | | Cell Mol Immunol0，3，1： | 1 |
| 9 | Stoichiometric NbTiAl_3 (γ1 Phase) Alloy in Ti-Al-Nb Ternary System显示文摘The microstructure and phase constitution in stoichiometric NbTiAl3 (γ1 phase) alloy treated at 1000℃ were examined by metallography and X-ray diffraction. The alloy microstructure is mainly γ1 phase containing η second phase [(Ti,Nb)Al3] less than 1%. DTA analysis shows no phase transformation from room temperature to 1200℃. In the diffusion couple of NbTiAl3 with 7-TiAl compound, clear phase boundary and composition jump exist between γ1 and γ phase.These results further confirm the existence of γ1 single phase at 1000℃ in Ti-Al-Nb ternary system. | Jingxia CAO Jinjun DING and Shiming HAO (Dept. of Materials Science and Technology, Northeastern University Shenyang 110006, China)(To whom correspondence should be addressed)Guoliang CHEN (Dept. of Materials Science and Technology University of Science | 1996 | Journal of Materials Science & Technology1996，12，6： | 0 |
| 10 | Strong Inclusion Complexation Using Hydroxypropyl-β-Cyclodextrin as Host Molecule显示文摘Inclusion complexes of nitro-compounds using β-cyclodextrin and hydroxypropyl-β-cyclodextrin as host molecule have been studied by cyclic voltammetric method. The inclusion constants of the corresponding complexes have been determined. Strong inclusion complexation by hydroxypropyl-β-cyclodextrin has been | Shu Qin LIU Hui Zhi FAN Wen Hui JIA Jing Hao PAN(To whom correspondence should be addressed.) (Department of Chemistry, Shanxi University,Taiyuan 030006) | 1997 | Chinese Chemical Letters1997，8，3： | 0 |
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