论文部分内容阅读
一、前言印度塔尔沙漠面积28600平方公里,是世界上居住人口最多的沙漠区。其气候和土壤条件特点是温度高、雨量低而不稳、蒸发远大于降水、土壤有机质含量低、干燥风强。随着人口和牲畜数量的增长,食物、饲料、木材和薪材的需求日益增加,从而使森林和边缘农地开发过度,继而渐渐导致严重的沙漠化和环境退化。在沙漠区主要城镇附近建起的工业则进一步增加了这种危险。
I. Preface Thar desert in India covers an area of 28,600 square kilometers and is the desert area with the largest population in the world. Its climate and soil conditions characterized by high temperature, low and unstable rainfall, evaporation is much larger than precipitation, soil organic matter content is low, strong dry wind. As the population and numbers of livestock increase, the demand for food, feed, timber and fuelwood is increasing, leading to over-exploitation of forests and marginal agricultural lands, which in turn leads to serious desertification and environmental degradation. Industry built near major towns in the desert added further to this danger.