金华市高山与平原无公害蔬菜生产的环境质量比较

对金华市高山、低山和平原无公害蔬菜基地的水、大气和土壤等环境质量的系统监测及对蔬菜生产现状的调查分析结果表明：三地环境优良，均适宜发展无公害蔬菜生产、高山区气候独特，昼夜温差大，蔬菜产量高，品质好，是发展经济途径之一，但山地环境脆弱，应加强环境保护。

ENVIRONMENTAL PROBLEM IN THE HISTORY OF DEVELOPMENT ON THE HANJIANG RIVER VALLEY

The juncture of development all over the Hanjiang River Valley was that immigrants poured into this area and population increased enormously in Ming and Qing dynasties.The economic development in the valley brought about eco environmental destruction,which was mainly manifested by:(1) indiscriminate reclamation and cultivation of waste land in mountain areas of the upper and middle basins of Hanjiang River resulted in forest destruction,water and soil erosion and the eventual all round deterioration of eco environment.(2) on the lower basin,vicious expansion of Yuantian over the Jianghan Plain led to silting up of rivers and lakes,hence the chaos of the river system and the frequent occurrence of floods.