The natural environment is excellent in Xinjiang Uygur Autonomous Region in China. There are huge mountains and extensive desert in wild *** and industrial developments have rapidly occurred in this region resulting d...
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The natural environment is excellent in Xinjiang Uygur Autonomous Region in China. There are huge mountains and extensive desert in wild *** and industrial developments have rapidly occurred in this region resulting development of traffic networks and *** management should be made to keep the excellent natural environment in this *** present condition of tourism of Xinjiang observed by the authors and some considerations on the nature conservation based on these observations and comparisons with Japan were given in this paper.
Recent experiments that demonstrated a positive effect of species diversity on primary productivity have generated both considerable interest and *** methods have been developed for analyzing and interpreting the dive...
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Recent experiments that demonstrated a positive effect of species diversity on primary productivity have generated both considerable interest and *** methods have been developed for analyzing and interpreting the diversity-productivity *** we propose a new"subset approach"to directly test the existence of complementarity effect at any diversity *** analyzed whether each multi-species combination performs better than its subset combinations(the less diverse combinations comprised by its component species),and test the existence of complementarity effect at different diversity *** subset approach and several other methods(ANOVAs, overyielding index,and"additive partition") were applied to data from an aquatic microcosm *** this experiment,we used five algal species,cultured in all possible combinations,to create a species richness *** analysis implied that species diversity had a progressive stronger positive effect on productivity through time,but the selection effect became less ***"additive partition"method showed positive selection and complementarity *** selection effects exceeded the complementarity effect at the early stage of the experiment;but the two types of mechanisms contributed equally at the later *** overyielding test found small proportion of mixtures yielded more than the most productive monoculture of component species,and offered little evidence for niche complementarity ***"subset approach"analysis proved significant complementarity effect at 2-species diversity level at some time points during the experiment;but rejected the existence of complementarity at higher diversity levels.
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