澜沧江—湄公河及部分支流鱼类多样性与水文特征的关系

The Correlation between Fish Diversity and Hydrological Parameters in Lancang-Mekong River and its Upper Tributaries

选取了澜沧江—湄公河流域的干流和部分支流,对鱼类种类数与水文及流域特征的关系进行了统计分析.在一元线性回归分析中:特有种类数与鱼类种类数呈极显著性正相关;鱼类种类数和特有种类数的绝对数与干流长、流域面积、多年平均流量呈极显著性正相关.全部种类数和特有种类数的多元逐步回归分析得到的最优回归方程分别保留了多年平均流量、含沙量以及流域面积和含沙量.主成分分析得到的第1和第2主成分分别反映了不同水域中鱼类相对数目、绝对数目与流域的水文特征之间的关系.

Take the mainstream and some tributaries of Lancang-Mekong River as the sample,and use regression and principal components to analyze statistically the correlation between freshwater fish number and hydrological parameter and basin character.It is found that there are positive significant between endemic fish species number and all fish species number,same as the correlation between all fish species number and endemic species number to mainstream length,basin area,and average river discharge.Average river discharge and falling gradient of river are preserved in the Multifactor stepwise regression analysis of all fish species number,as the Basin area and falling gradient of river in the stepwise analysis of endemic species number.The first and second principal components reveal correlation between fish species number and hydrological parameter and basin character.