海螺沟冰川退缩区原生演替碳氮磷生物地球化学过程

The succession of plant community has crucial theoretical and practical significance and primary vegetation succession plays an important role in the plant community succession. At present, relevant researches on primary succession of vegetation are merely scarce owing to the fact that the continuous and complete succession proves is required to support this process. This project aimed at the primary succession of nitrogen and phosphorus biogeochemical cycle of the key function .Using the vegetation succession and biogeochemical principles and methods, the biogeochemical cycle of the primary succession sequence of carbon, nitrogen and phosphorus in Hailuogou deglaciated region was studied by measuring the migration and transformation of these elements. To evaluate the absorbing strategy of nitrogen and phosphorus elements in the process of plant growth and development, it can be revealed the effect of carbon, nitrogen and phosphorus on the stability of top level communities during the primary succession process and the quantitative character of continuous and complete primary succession sequences. It will be quantified of biogeochemical processes of carbon, nitrogen and phosphorus in primary succession in Hailuogou deglaciated region .The continuity and integrity of the primary succession will be confirmed for the first time，and will be added the new content of the primary succession，and can aslo would provide the data reference and theoretical basis for the restoration and stable development of ecosystems in the primary succession of carbon, nitrogen and phosphorus biogeochemical cycles under the future climate change.

植物群落演替规律具有重要的理论和实践意义，原生演替是植物群落演替理论的重要内容，原生演替过程需要连续、完整的演替序列实证，对此目前还缺乏相关的研究成果。本项目针对原生演替氮磷生物地球化学循环这一主要功能过程，运用植被演替和生物地球化学原理和方法，通过测定不同层次碳氮磷元素在海螺沟冰川退缩区原生演替的迁移、转化，研究原生演替序列碳氮磷的生物地球化学循环。评价植物生长发育过程中氮磷元素的利用策略，揭示碳氮磷生物地球化学循环在原生演替过程中对形成顶级群落稳定性的作用。量化表达海螺沟冰川退缩区原生演替碳氮磷生物地球化学过程，首次实证原生演替序列的连续性和完整性,丰富原生演替的内容。模拟在未来气候变化情景下原生演替碳氮磷生物地球化学循环模式,将为生态系统恢复和稳定发展提供数据参考和理论依据。

依托贡嘎山高山生态系统观测试验站，在系列样地长期观测的基础上，运用植被演替和生物地球化学原理和方法，多层次研究了海螺沟冰川退缩区原生演替碳氮磷生物地球化学过程。在固定样地测定不同阶段生态系统碳氮磷元素的变化，在演替序列探索元素驱动机制。探明了原生演替中碳氮磷元素的迁移、转化的方式、途径和循环模式，明确了生物因子和非生物因子的作用。探明了原生演替碳氮磷元素生物地球化学过程对形成顶级群落稳定性的作用，评价了植物生长过程中氮磷元素的利用策略。研究结果将为生态系统恢复和环境保护提供理论依据和一些具体的方法措施。