2013—2022年乌兰布和沙漠东北缘沙尘活动特征及其对土地利用类型变化的响应
郭文芳 1辛智鸣 肖辉杰 1罗凤敏
作者信息
- 1. 2013—2022年乌兰布和沙漠东北缘沙尘活动特征及其对土地利用类型变化的响应
- 折叠
摘要
本研究基于乌兰布和沙漠东北缘荒漠—绿洲过渡带及绿洲内部两座50 m风沙监测铁塔2013—2022年的观测数据，分析沙尘水平通量、降尘量及风况变化特征，并结合土地利用类型变化探讨其对沙尘活动的影响。结果表明：2013—2022年研究区农田面积年均增加46.84 km2，草地和裸地面积分别年均减少18.16 km2、27.19 km2。过渡带沙尘水平通量及风速高于绿洲内部，而绿洲内部的降尘量高于过渡带；随高度增加，沙尘水平通量和降尘量呈波动下降趋势，风速呈增加趋势。2013—2019年沙尘水平通量和降尘量呈降低趋势，2020—2022年出现阶段性回升，且同期冬季过渡带风速较高。农田扩张降低了过渡带降尘量，但显著提高了风速，防护林面积增加降低了过渡带及绿洲内部的沙尘水平通量和降尘量。冗余分析表明，土地利用类型变化对沙尘活动的解释度（82.1%）高于气候因子（17.9%），其中防护林面积贡献最大（55.6%）。
Abstract
This study analyzed variations in horizontal dust flux, dustfall flux, and wind regimes from 2013 to2022, based on observations from two 50 m aeolian monitoring towers in the desert-oasis ecotone and oasis interior. Accordingly, the effects of land- use change on dust activity were further explored. The results showed that cropland increased by 46.84 km2 each year during 2013- 2022, whereas grassland and bare land decreased by 18.16 and 27.19 km2 respectively each year, respectively. Horizontal dust flux and wind speed were generally higher in the ecotone than in the oasis interior, while dustfall flux was higher within the oasis. With increasing height above the ground surface, horizontal dust flux and dustfall flux exhibited fluctuating downward trends,whereas wind speed increased. Horizontal dust flux and dustfall flux decreased during 2013-2019 but rebounded during 2020-2022, accompanied by higher winter wind speeds in the ecotone. Cropland expansion reduced dustfall flux in the ecotone but increased wind speed, whereas increases in shelterbelt area reduced horizontal dust flux and dustfall flux in both the ecotone and oasis interior. Redundancy analysis showed that land-use change explained a larger proportion of the variation in dust activity (82.1%) than climatic factors (17.9%), with shelterbelt area contributing the most (55.6%).关键词
沙尘水平通量/降尘量/风况/土地利用类型/乌兰布和沙漠东北缘Key words
horizontal dust flux/dustfall/wind/land use type/northeastern margin of the Ulan Buh Desert引用本文复制引用
郭文芳,辛智鸣,肖辉杰,罗凤敏.2013—2022年乌兰布和沙漠东北缘沙尘活动特征及其对土地利用类型变化的响应[EB/OL].(2026-09-11)[2026-09-13].https://chinaxiv.org/abs/202609.00100.学科分类
环境科学理论
