黑河是我国第二大内陆河流域，是西北乃至全国重要的生态安全屏障，但随着人口增长与人均土地资源减少之间的矛盾日益突出，导致湿地环境遭到严重干扰和破坏，生态环境不断恶化，为此，及时准确地掌握湿地植被演替规律及其驱动机制，已成为现阶段湿地保护恢复中迫切需要解决的问题。本研究以黑河流域中游湿地的张掖黑河湿地国家级自然保护区作为研究对象，收集林业、水务部门相关的植被、水文变化历史资料；利用黑河保护区湿地设置的固定样地，补充设置调查样地，开展植被、土壤及水文的野外调查、观测以及实验室化验、分析。通过相关分析方法，阐明黑河保护区湿地植被群落空间分布及演替规律，土壤理化特性的空间分布特征；确定水文变化对植物群落和优势种、关键种的生长动态和生物量影响，以及水文变化对土壤理化特性空间变异的影响；揭示植被与土壤相互作用的机制，提出湿地保护与恢复的对策、建议，将对湿地保护、生态环境实现可持续发展具有重要的科学意义。

Heihe River is the second largest inland basins of China and the key ecological security barrier of the northwest and even the whole country. The wetland ecosystems have been seriously disturbed and damaged and the ecological conditions continue to worsen mainly because the conflict between population growth and the decrease of land resources per capita is becoming more and more seriously. Therefore, the timely and accurate understanding of the succession rules and driving mechanisms of wetland vegetation has been the key problem for current wetland protection and restoration. This project studies the Heihe national natural wetland reserve in Zhangye, the middle reaches of Heihe River, through the field investigation of vegetation, soil and hydrological processes in the permanent sampling plots and supplementary plots in the Reserve, and the data collection from the forestry and water resource authorities. It is aimed to elucidate the spatial patterns and succession rules of wetland vegetation community and the physicochemical properties of soils in the Heihe Reserve; and to clarify the influences of hydrological variations on the growth dynamics of plant communities, dominant species and keystone species, biomass as well as the effects on the spatial variability of soils; and to fully understand the interaction mechanisms between vegetation and soil. The further purpose of this study is to offer the countermeasures and advice for wetland protection and restoration, which is of great importance to wetland protection and the sustainability of ecological conditions.