CROP PRODUCTION IS A POPULATION PROCESS AN ECOLOGICAL STUDY ON CLUPANODON PUNCTATUS IN THE WATERS OF DONGSHAN ISLAND Ecological characteristics of Abies georgei population at timberline on the north-facing slope of Baima Snow Mountain, Southwest China Growth Plasticity of Ramets of Phalaris Arundinacea Population in the Different Habitats of Xiliao-River Plains Heterogeneity of Carchesium polypinum(Ciliophora: Peritrichida)in Donghu Lake Analysis of the Plasticity of Growth and Density-Dependent Regulation of Hordeum Brevisubulatum Population of the Songnen Plan Population ecology of Aulacoseira granulata in Xijiang River Current Situation about the Research of Bamboo Clonal Population Ecology and Its Application Prospect Progress report on the study of Psathyrostachys huashanica and its application to wheat improvement