荒漠生态系统C、N、P生态化学计量研究进展

生态化学计量学是通过研究生物有机体主要元素含量及其比值的变化关系，揭示生态系统各组分间元素循环规律的一门学科，生态化学计量也是荒漠生态系统研究的重要内容。因此，综合掌握水分和养分限制环境下C、N、P生态化学计量的关系对揭示荒漠生态系统植物的限制性元素、土壤营养的供给能力、养分的有效性等都具有重要的意义。基于此，回顾和分析了国内外荒漠生态系统C、N、P生态化学计量最新研究和动态，分别从植物、凋落物、土壤、土壤微生物、土壤酶进行较为系统的评述，讨论了植物-土壤-微生物-酶四者的关系，提出了荒漠生态系统C、N、P生态化学计量的未来研究方向，期望为全面理解固沙植被的演变过程、稳定性维持机制及其科学管理提供理论指导。

Research progresses in ecological stoichiometry of C， N and P in desert ecosystems

Ecological stoichiometry is one of the important researches directions of desert ecosystems， in which the relationship between the contents and ratios of main elements in biological organisms is studied， in order to reveal the elemental circulation rules among the components of the ecosystem. Therefore， comprehensively understanding the ecological stoichiometry of C， N and P in water and nutrient limited situations is of great significance to reveal the judgment of plant restrictive elements in desert ecosystems， the supply capacity of soil nutrients， and the availability of nutrients. In this paper， the latest researches trends and progresses of ecological stoichiometry of C， N and P in desert ecosystems were reviewed based on the stoichiometry of C， N and P in plants， litters， soil， soil microorganisms and soil enzymes. The relationships among plant-soil- microorganism-enzyme were also discussed. Finally， the future research directions of ecological stoichiometry of C， N and P in desert ecosystems were put forward. We do hope this review could provide theoretical guidance for the comprehensive understanding of the evolution process， stability maintenance mechanism and scientific management of sand-fixing revegetation.