长江以南有大片丘陵山地 ,这些山地多数坡度陡 ,土层浅 ,生态脆弱 ,有植被时满山葱绿 ,一旦植被破坏 ,三年两载便石层外露 ,迅速荒漠化。近年来 ,随着果业生产的迅猛发展 ,丘陵山地被陆续开发。开发丘陵山地的过程中 ,如水土保持工作滞后 ,极易造成人为的荒漠。尤其是长江中下? In the south of the Yangtze River, there are large hilly mountains. Most of these mountains have steep slopes, shallow soil layers and fragile ecosystems. When vegetation is covered with verdant vegetation, once the vegetation is destroyed, the rock bearing layers are exposed for two years and are rapidly desertified. In recent years, with the rapid development of fruit industry, hilly and mountainous areas have been gradually developed. During the process of developing hilly and mountainous areas, such as water and soil conservation work lagging behind, it is very easy to cause artificial desert. Especially the middle and lower reaches of the Yangtze River?