渭河流域生态环境对野鸭数量分布的影响

环境是动物生存的基础，人类的活动对环境所造成的影响，直接导致动物种群数量的变动。通过渭河咸阳段气候、水质、水域面积、植物等环境因素的改变对野鸭数量分布影响的调查，表明环境的恶化导致了动物的生存受到威胁，数量减少，分布区域缩小。随着环境保护意识的增强，渭河流域的水土流失，水质污染、退耕还草等环境问题逐渐得到解决，动物的生活环境不断得到改善，其种群数量、分布范围随之增加。

INFLUENCE OF ECO-ENVIRONMENT CHANGE IN WEIHE RIVER VALLEY ON DISTRIBUTION OF WILD DUCK

The present article is aimed at studying the change of eco-environment, or the habitat of the wild duck in Weihe River Valley, Shaanxi Province. As is known, eco-environment is the survival basis for all the creatures, including wild birds. Intensive human activities, especially, human activities in recent years have resulted in a great change in the habitat of the wild duck and caused a serious drop of their population. In order to bring about a clear picture, the present author has done a detailed investigation of all the environmental factors, especially, those of survival factors of the wild duck, for example, the changes with the local climate, the water quality, the water space, the plant population, and so on, in the Weihe River along the river, particularly in the section of Xianyang. From this investigation, it can be found that the wild duck population drops mainly due to the ever worsening of their habitats. However, the local government and local people have now been aware of this problem and began to pay attention to the improvement of the habitat, including strengthening of water and soil protection by turning part of farmland back into grassland. Thus it can be certain that with the improvement of their habitat, the wild duck population will have surely been increasing day by day. The population size will be increased and its distribution will be more and more appropriate as a result of the continuing improvement of their habitats.