The species diversity at the regeneration stage, inflenced by different water levels, is important for community composition in the later growing season.Regeneration diversity of Carex lasiocarpa community under diffe...The species diversity at the regeneration stage, inflenced by different water levels, is important for community composition in the later growing season.Regeneration diversity of Carex lasiocarpa community under different water levels was studied at two stages, recruitment and adult, in the Sanjiang Plain, Heilongjiang Province, China.The results showed that, at the two growing stages, important value of C.lasiocarpa population and species richness of the community decreased with the increasing water level, while the Simpson and Shannon-Wiener diversity indexes and Pielou evenness index increased.Under different water levels, community diversities were higher at the recruitment stage, while population important values of C.lasiocarpa were higher at the adult stage.Indexes in vegetation evaluation must be chosen prudentially for successful restoration and effective management of wetlands, and especially for wetland restoration, the optimal time should be selected according to the restoration objectives and costs.展开更多
This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the com...This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the compression performance of RAC columns as well as the flexural performance of RAC slabs are overviewed and summarized.The seismic responses of beam-column joints,shear walls as well as frames made of RAC are also covered.The experimental observations indicate that the structural performance of RAC elements and structures is somewhat similar to that of natural aggregate concrete(NAC) members.A brief introduction to the application of RAC in sustainable buildings in China is also presented.展开更多
基金Under the auspices of the National Basic Research Program of China (No. 2009CB421103)Northeast Revitalization Program,Chinese Academy of Sciences (No. DBZX-2-024)
文摘The species diversity at the regeneration stage, inflenced by different water levels, is important for community composition in the later growing season.Regeneration diversity of Carex lasiocarpa community under different water levels was studied at two stages, recruitment and adult, in the Sanjiang Plain, Heilongjiang Province, China.The results showed that, at the two growing stages, important value of C.lasiocarpa population and species richness of the community decreased with the increasing water level, while the Simpson and Shannon-Wiener diversity indexes and Pielou evenness index increased.Under different water levels, community diversities were higher at the recruitment stage, while population important values of C.lasiocarpa were higher at the adult stage.Indexes in vegetation evaluation must be chosen prudentially for successful restoration and effective management of wetlands, and especially for wetland restoration, the optimal time should be selected according to the restoration objectives and costs.
基金supported by the Natural National Science Foundation of China (Grant No. 51178340)the Shanghai Science and Technology Committee (Grant No. 10231202000)the New Century Excellent Talents in China Ministry of Education Project (Grant No. NCET-06-0383)
文摘This paper presents a review of the studies on the structural performance of recycled aggregate concrete(RAC) elements and structures in the past 10 years in China.The flexural and shear behaviour of RAC beams,the compression performance of RAC columns as well as the flexural performance of RAC slabs are overviewed and summarized.The seismic responses of beam-column joints,shear walls as well as frames made of RAC are also covered.The experimental observations indicate that the structural performance of RAC elements and structures is somewhat similar to that of natural aggregate concrete(NAC) members.A brief introduction to the application of RAC in sustainable buildings in China is also presented.
