中文摘要：

土壤水分是沙漠沙生植物成活和生长的最主要因子,不同的地形类型下土壤水分空间分布差异明显。利用智能中子水分仪定时测定土壤水分的方法,测定并分析了巴丹吉林沙漠东南缘不同地形下0~200 cm深土壤共10个层次的水分时空变化特征。结果表明：巴丹吉林沙漠东南缘土壤水分空间分布具有一定规律性,土壤水分丘间地下部〉丘间地中部〉丘间地上部〉沙丘上中下部,沙丘上中下部的年季变化不大,总体处于平稳状态;丘间地土壤水分变化较其他地形大,春季土壤水分不是很丰富,土壤水分波动不大;夏季受植物生长、太阳蒸腾和降雨的影响,土壤水分时空变化差异明显,20 cm以上水分增多,40~180 cm表现为水分变化活跃层;秋季水分整体含量增加。巴丹吉林沙漠东南缘不同地形下土壤水分时空变化研究为大规模的沙漠生态平衡治理、生态系统人工修复以及沙区可持续发展等提供了科学的依据。

英文摘要：

Soil moisture is the most important factor for the survival and growth of desert psammophytes. Under different types of terrain, spatial distribution of soil moisture has significant differences. Using smart neutron moisture meter timing measurement of soil moisture, different terrain 0-200 cm deep soil moisture of 10 levels of spatial and temporal variation characteristics were measured and analyzed in southeast edge of Badain Jaran desert. The results showed that： soil moisture spatial distribution of the southeastern margin of the Badain Jaran desert had a certain regularity： lower interdune lowland〉middle interdune lowland〉upper interdunal lowland〉the upper, middle and lower of dunes. And the annual variability of sand dune was overall in a steady state; soil moisture of interdune lowland changed than other terrain. In spring, soil moisture was not very rich, soil moisture had little fluctuations; In summer, plant growth were limited by transpiration and rainfall, there was significant differences of temporal and spatial variation of soil moisture, soil moisture above 20 cm increased and 40- 180 cm were the active layer of the performance of moisture of change; moisture content increased in the overall fall. The southeast edge of the Badain Jaran desert soil moisture temporal and spatialvariation in topography study provided a scientific basis for the massive desert ecological balance governance, ecosystem artificial restoration and sandy areas of sustainable development.