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| 1 | Effect of Snow-cover Duration on Plant Species Diversity of Alpine Meadows on the Eastern Qinghai-Tibetan Plateau显示文摘Although snow cover plays an important role in structuring plant diversity in the alpine zone,there are few studies on the relationship between snow cover and species diversity of alpine meadows on the eastern Qinghai-Tibetan Plateau.To assess the effect of snow cover on plant species diversity of alpine meadows,we used ten parallel transects of 60m×1m for this study and described the changes in species diversity and composition associated with snow depth.With the division of snow depth into six classes,the highest species richness(S)and species diversity(H')occurred with an intermediate snow depth,i.e.,class III and class IV,showing a unimodal curve with the increase in snow depth.The relationship between snow depth and plant diversity(both richness and Shannon index)could be depicted by quadratic equations.There was no evident relationship between diversity(both S and H')and soil water content,which implied that other more important factors influenced species diversity.The patterns of diversity found in our study were largely attributed to freeze-thaw alteration,length of growing season and disturbances of livestock grazing.Furthermore,snow depth affected species composition,as evaluated by the Srensen's index of similarity.In addition,almost all species limited to one snow depth class were found only in class III and class IV,indicating that intermediate snow depth was suitable for the survival and growth of many alpine species. | CHEN Wennian WU Yan WU Ning LUO Peng | 2008 | Journal of Mountain Science2008，5，4： | 19 |
| 2 | Primary inquiry of intemal as cast residual stress of ingot mould made of grey cast iron显示文摘 | ZHU Shuceng WU Shibin HAN Wennian | 1991 | Hebei Institute of Technology1991，，1： | 1 |
| 3 | Oxidant Effect of H2O2 for the Syntheses of Quinoline Derivatives via One-Pot Reaction of Aniline and Aldehyde显示文摘 | Qiaoxia Guo Wennian Wang Weiling Teng Liwei Chen Yanqing Wang Baojian Shen | 2012 | Synthetic Communications2012，，17： | 1 |
| 4 | Spatiotemporal variations of CO_(2) fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir(TGR),China显示文摘Aims Riparian ecosystems play an important role in overall ecosystem function,including the global carbon cycle of terrestrial ecosystems,at both landscape and global scales.Yet few studies have reported in situ measurements of CO_(2) in riparian areas where flooding is a unique disturbance to carbon cycling.Methods At multiple locations across riparian zones(RZ)with different water submergences in Xiangxi Bay(XXB),we studied seasonal variations of CO_(2) exchange between this Cynodon-dominated community and the atmosphere for 2 years by using static chambers.Important Findings We found that the seasonal changes in CO_(2) fluxes were apparent and dependent on the biophysical environment.In the beginning of spring,low gross primary productivity(GPP)in lightly flooded zones(LFZ)resulted in a positive net ecosystem exchange(NEE),indicating a net CO_(2) source.With the increase in temperature,more species and vegetation abundance appeared,and the increased GPP turned the LFZ from a net CO_(2) source into a sink.This transi-tion seemed predominantly controlled by the physiological growth of vegetation.The mean NEEs,REs and the light-use efficiency(α)of the vegetation at HFZ and MFZ were significantly higher than those at LFZ and UFZ.Yet the coefficients of variation(CV)of NEE and RE at MFZ and HFZ were lower than those at LFZ and UFZ.Submergence promoted the emission and uptake of CO_(2) to the atmosphere.Elongated submergence reduced the number of spe-cies and lowered the spatial variability of the RZ,further lowering the variation of the CO_(2) exchange. | Wenli Zhang Jiquan Chen Ju Liu Fangqing Chen Quanfa Zhang Zutao Ouyang Changliang Shao Yi Fan Wennian Xu | 2018 | Journal of Plant Ecology2018，11，6： | 1 |
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