沙漠-绿洲过渡带风沙活动特征——以敦煌黑山嘴地区为例

统计2013-2014年度敦煌黑山嘴地区沙漠-绿洲过渡带气象资料，对区域风沙活动特征进行系统研究。结果表明：区域内合成起沙风以偏南风为主，即由沙漠指向绿洲。从沙漠腹地到绿洲内部，由于植被和房屋增多，起沙风频次和合成输沙势减小，风沙活动减弱，且春季风沙活动最强烈。夏秋季节植被可有效降低风速，减少起沙风频次，改善局地气候。平均气温与平均空气湿度负相关。月平均气温与月平均风速呈现同步性，越靠近沙漠腹地，两者同步性越强；日间气温与风速变化存在同步性，但夜间沙漠与绿洲气温差对风速存在影响，温差越大，风速波幅越大。

Characteristics of the Sand Transportation Intensity in the Desert-oasis Ecotone: A case study in Heishanzui Area of Dunhuang

According to meteorological data of the Heishanzui area of Dunhuang, the authors conducted systematic study about the regional sand activity characteristics. The results show that the main direction of the resultant sand-driving wind is south, just from desert hinterland to oasis. From desert to oasis, the vegetation and buildings cover increase, thus the frequency of sand-driving wind and drift potential reduce. So the sand activities have gradually been weakened, and spring has the strongest sand activities. In summer and autumn, the vegetation of oasis not only effectively reduce the wind speed, but also reduce the frequency of sand-driving wind and thus improve the microclimate. The relation between the daily variation of temperature and humidity is obviously negative. However, with the increase of monthly average wind velocity, the monthly average temperature rises. And the more closer to the desert hinterland, the higher of their correlation. But this phenomenon of between day and night just exist in the summer and autumn.