摘要
内蒙高原东南部现代沙漠化过程可分为四种:(1)、沙丘活化过程;(2)、草原灌丛沙漠化过程;(3)、风蚀砾质化过程;(4)、农田土壤风蚀过程。七十年代中期该地区有各类沙漠化土地2万多km^2,八十年代中期发展到3.3万km^2,年增长率为5.1％。研究区近十年降水量普遍减少,变率增大,雨量集中,旱季加长。这种不利的气候趋势未见回转的迹象,沙漠化会继续发展。公元2000年沙漠化土地将达到4.4万多平方公里。发展当地农业经济的总方针应是“巩固农业,发展林、牧业”。完善防护体系,改变种地不施肥的陋习,建设稳产高产基本田,防治土地沙漠化是巩固农业的关键。
In Southeast part of Inner Mongolia, the contemporary processes of desertification can be divided-into four types: (l)The process of dune reactivation; (2)The process of steppe shrub desertification; (3)The process of Wind erosion and gritty Surface formation; (4)The process of farmland soil deflation. In middle 70's,there were over 20,000km2 of all kinds desertified areas in the region but up to mid-80's,the desertified areas had grown to 33,000 km2. The annual growth rate is 5. 1%. In the studied region,the precipitation is decreaseing commonly and varies greatly,the drought season tends to be prolonged. The desertification will continue to develop. It may be predicted that by the 2000,the desertified land will expand to 11,000km2,the total areas will amount to 44,000km2.
The general policy for developing local agricultural economy might be 'To strengthen the agriculture, develop the forestry and stock raising',to perfect the system of farmland protective forest,change the habits of cultivation without fertilizing and set up high and stable-yield farmlands. To control the land desertification is the key for the development of agriculture.
出处
《中国沙漠》
CSCD
北大核心
1991年第2期11-19,共9页
Journal of Desert Research
