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通过天然径流演变对河流生态系统和生态条件进行定量分析是目前河流生态学领域的重要研究手段之一。本研究采用长江宜昌站1978年-1991年实测日径流资料,从中提取径流演变统计特征量,利用主成分分析方法对统计特征量进行降维,通过对流量机制特征量主成分与长江中下游各省水产业总产量及其增长率的回归分析,发现:径流演变特征值与水产业总产量之间显著相关,径流演变特征值与水产业增长率存在显著的滞后性相关关系。研究结果表明:长江上游径流演变对于中下游河流生态系统的维持和发展有重要意义。
Quantitative analysis of river ecosystem and ecological conditions through natural runoff evolution is one of the important research methods in the field of river ecology. In this study, we used the measured daily runoff data of Yichang Station in the Yangtze River from 1978 to 1991 to extract the statistical features of runoff evolution, and used principal component analysis (PCA) to reduce the statistical features. Through the analysis of the main components of the characteristics of the flow mechanism and the middle and lower reaches of the Yangtze River The regression analysis of the total output of aquaculture and its growth rate shows that there is a significant correlation between the eigenvalues of runoff evolution and the total output of aquaculture. There is a significant lag correlation between the characteristics of runoff evolution and the growth rate of aquaculture. The results show that the evolution of runoff in the upper reaches of the Yangtze River is of great significance to the maintenance and development of the river ecosystems in the middle and lower reaches.