Liao Jie, Peng Fei, Kang Wenping, Chen Xiaojie, Sun Jianbo, Chen Ben, Xia Yu, Du Heqiang, Li Sen, Song Xiang, Wang Tao
Drylands Salinization Research Station, Northwest Institute of Eco-Environment and Resource, Chinese Academy of Sciences, Lanzhou 730000, China.
Drylands Salinization Research Station, Northwest Institute of Eco-Environment and Resource, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, China.
Sci Total Environ. 2024 Aug 20;939:173558. doi: 10.1016/j.scitotenv.2024.173558. Epub 2024 May 30.
Center Pivot Irrigation system (CPIs) is widely used in newly exploited arable land in sandy lands. These sandy lands are currently stable because of climate change and ecological restoration efforts since the beginning of the 21st century in northern China. The exploitation of these fixed sandy lands to arable land with CPIs may affect the soil wind erosion, yet it remains unknown. The temporal changes of CPIs and its effect on wind erosion module were analyzed and modeled from 2000 to 2020 in Mu-Us sandy land using satellite images and Revised Wind Erosion Equation (RWEQ). The establishment of CPIs started from 2010, boomed in 2015 and peaked in 2020. They were mainly transformed from woodland, grassland, and barren land near rivers in east and southeast, and from cropland in inter-dunes in west and southwest of Mu-Us sandy land. The temporal and spatial pattern of CPIs well aligns with the land consolidation and requisition-compensation balance policies. In most of the Mu-Us sandy land, the annual erosion module is <25 t ha a. Despite great variation, the annual, Winter and Spring erosion module of the Mu-Us sandy land or in Otog Qian and Yuyang, the CPIs concentrated counties, all decreased during 2000-2019. Although, wind erosion module in CPIs was lower than the surrounding area, it increased in 2019 given the same climate conditions as in 2010. Our results suggest 1) the establishment of CPIs in Mu-Us sandy land greatly depends on the local policy and natural endowment, and 2) although the set-up of CPIs showed no impact on the wind erosion with CPIs accounting for <1 % of Mu-Us sandy land, post-harvest of CPIs should be carefully concerned to prevent soil wind erosion.
中心支轴式灌溉系统（CPIs）在中国北方21世纪初以来因气候变化和生态恢复努力而目前处于稳定状态的沙地新开垦耕地上被广泛使用。利用这些固定沙地通过CPIs开垦耕地可能会影响土壤风蚀，但情况仍不明朗。利用卫星图像和修正风蚀方程（RWEQ），对2000年至2020年毛乌素沙地CPIs的时间变化及其对风蚀模数的影响进行了分析和建模。CPIs的建设始于2010年，在2015年蓬勃发展，并于2020年达到顶峰。它们主要由毛乌素沙地东部和东南部靠近河流的林地、草地和荒地，以及西部和西南部沙丘间的农田转变而来。CPIs的时空格局与土地整理和占补平衡政策高度契合。在毛乌素沙地的大部分地区，年侵蚀模数<25 t ha a。尽管变化很大，但毛乌素沙地或CPIs集中的鄂托克前旗和榆阳区在2000 - 2019年期间的年、冬春侵蚀模数均有所下降。虽然CPIs区域的风蚀模数低于周边地区，但在与2010年相同的气候条件下，2019年其风蚀模数有所增加。我们的研究结果表明：1）毛乌素沙地CPIs的建设很大程度上取决于当地政策和自然禀赋；2）尽管CPIs占毛乌素沙地面积不到1%，其建设对风蚀没有影响，但CPIs收获后应谨慎关注以防止土壤风蚀。
