摘要
神府、东胜煤田50000Km^2范围内现有沙漠化土地37990.2Km^2,占总土地面积的72.9％,比七十年代后期的41153.67Km^2减少了3163.46Km^2,减少了6％左右。通过对土地沙漠化形成因子的多元分析,表明土地沙漠化是在全球或区域气候变化的背景下演进的。人为活动也在相当程度上受气候干湿变化的制约。人为活动对土地沙漠化的诱发作用具有气候因素控制下的复杂反应性质。根据土地沙漠化多因子控制模型,预测沙漠化发展趋势,并提出了相应的防治对策。
Based on the field investigation,mapping depending on the time - lapse remote sensing images, sand sampling and analysis,short-term surveying and measuring of the windblown sand,wind tunnel simulating of different soils and calculation, this dissertation dealt with desertification of the Shenfu-dongsheng coal field, which lies in the southeast Ordos plateau. The results show that the desertified lands are 37990. 21km2,about 72. 9% of the total research area.Both natural and anthropic factors causing desertification are analyzed. According to strata records and C dating, 103 yrs quasiz - cyclic evolution of dry and wet climate changes since 10480 a. B. P are found. The luxuriant steppe stages were 10480,8000,7000-7500,6000-6500,5000-5500,3500-4000,2000-2500,and 1000-1500 a. B. P respectively when the dunes were stabilized in large scale. 290,130, 50, 35,14, 7 and 3yrs,quasi-cyclic of dry and wet changes are also found by cyclic graph and energy spectrum analysis. Periodic desiccation have been combining the irrational anthropic activities to cause land desertification. Intensity of wind erosion would increase by 3. 5-15 times in the first construction period if the intervention of coal mine developing were not brought under control.
出处
《中国沙漠》
CSCD
北大核心
1991年第4期50-60,共11页
Journal of Desert Research
