种子萌发强烈地影响植物生存，种群大小和物种分布范围，而一年生植物占优势的干旱区植物群落，种子萌发状况决定了植物多样性变化，是剖析生物多样性形成和维持机制重要方面，但目前将种子萌发与植物群落多样性变化联合研究极少。本项目以世界典型的准噶尔荒漠为研究地点，以对荒漠生态系统稳定和多样性维持起到重要作用的一年生植物为研究对象，通过研究80个常见物种种子萌发的温度水分依赖、系统进化关系，以及母体效应、气候变化和种间、种内相互作用对种子秋萌的影响，总结生物和非生物作用对种子秋萌的作用强弱，以及这种秋萌变化对白梭梭等群落优势物种种子萌发和幼苗定居的影响。通过建立降水、温度等环境因子、种子萌发等功能特征与植物多样性三者结合的模型，揭示气候变化下一年生植物秋萌对群落多样性的影响。本项目对丰富群落生态学研究内容，预测气候变化下准噶尔荒漠植被动态和群落演替特征，及时提出植被保护措施具有重要意义。

Seed germination strongly affects plant survival, population size and species distribution. And the seed germination decides the changes of species diversity in the arid area plant communities which were dominated by annual plants,as well as plays an important role in the analysis of biodiversity formation and maintenance mechanisms. However,there is little joint research on seed germination and changes of plant community diversity. This project is based on the typical Junggar Desert in the world as the research area and annual plants which are important for maintaining the stability and diversity of desert ecosystems as the objects of study. In this study,our aim is to summarize the effects of environmental factors such as biological and non-biological effects on the germination of annual plant seeds,as well as the changes on the seed germination and seedling settlement of dominant species such as Haloxylon ammodendron during study the temperature, moisture dependence and systematic evolution of the seed germination of 80 common annual species and the impacts of maternal effects of 12~16 species,climate change and the interaction between inter-species and intra-species on the seed germination in autumn.Furthermore,through intergrating the environmental factors(e.g., soil moisture),functional characteristics(e.g., seed germination) and the change of species diversity to set a theoretical model,and then to summarize the effects of autumn germination of the annual plants on the community diversity under climate change.This project has a great significance for enriching the studies of community ecology, predicting the dynamics of vegetation and characteristics of community succession under climate change in Junggar desert, and proposing the measures of vegetation protection in time.