Spatiotemporal changes and influencing factors of soil salinity in the Hetao Irrigation District
CHANG Xiaomin1,2, WANG Shaoli1,2*, CHEN Haorui1,2, FU Xiaojun3, XU nannan1,2, YANG Xiaoping4
1.Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2.National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 3.Shahaoqu Experiment Station of Hetao Irrigation District, Shanba, Inner Mongolia 015400, China; 4.Jiefangzha Administration Bureau of Hetao Irrigation District in Inner Mongolia, Hanggin Rear Banner, Inner Mongolia 015400, China
Abstract：To study the soil salinity dynamics and the main influencing factors in Hetao Irrigation District, the Jiefangzha Irrigation Scheme(JFIS)was selected as a study area. With the soil salinity in different soil layers, irrigation water, drain discharge, groundwater depth, salt concentration of the groundwater, rainfall, evaporation, etc. as the data foundation, combining with the cultivated land and salt wasteland area changes, the total soil salinity changes of 1-m-deep soil layer both in the cultivated land and salt wasteland during 2006—2016 was quantitatively estimated, the soil salinity dynamics was analyzed, and a prediction model for soil salinity of 1-m-deep soil layer was established. The results show that the annual salt accumulation is 571 200/y, 46.12% of which accumulates in 1-m-deep soil layer and the rest migrates to deep soil or groundwater, the soil salinity of 1-m-deep soil layer decreases by 6.34$ in the cultivated land, while increases by 86.8% in salt wasteland.The results of principle component analysis show that groundwater depth, drain discharge and annual evaporation have the greatest impact on soil salinity, followed by salt concentration of the groundwater, irrigation water and rainfall. Multiple linear regression analysis indicates that the soil salinity of 1-m-deep soil layer in the cultivated land is significantly related to groundwater depth, and the correlation coefficient can research 0.732.
[1]郑佳伟, 史海滨, 李正中, 等. 内蒙古河套灌区解放闸灌域土壤水盐空间变异性研究 [J]. 节水灌溉, 2010(2): 52-55. ZHENG Jiawei, SHI Haibin, LI Zhengzhong, et al. Research on spatial variability of soil water-salt in Jiefangzha Irrigation field of Hetao Irrigation District in Inner Mongolia[J]. Water saving irrigation, 2010(2): 52-55.(in Chinese)[2]IBRAHIMI M K, MIYAZAKI T, NISHIMURA T, et al. Contribution of shallow groundwater rapid fluctuation to soil salinization under arid and semiarid climate [J]. Arabian journal of geosciences, 2014, 7(9): 3901-3911.[3]刘显泽, 岳卫峰, 贾书惠, 等. 内蒙古义长灌域土壤盐分变化特征分析 [J]. 北京师范大学学报(自然科学版), 2014(5): 503-507. LIU Xianze, YUE Weifeng, JIA Shuhui, et al. Variation of soil salinity in the Yichang irrigation district Inner Mongolia [J]. Journal of Biejing Normal University, 2014(5): 503-507.(in Chinese)[4]江红南, 塔西甫拉提·特依拜, 丁建丽 等. 新疆渭干河灌区土地盐渍化时空变化影响因子分析 [J]. 干旱区地理2008, 31(6): 885-891. JIANG Hongnan, TASHPOLAT Tiyip, DING Jianli, et al. Tempo-spatial change driving forces of land sali-nization in Weigan Irrigated Area, Xinjiang [J]. Arid land geography, 2008, 31(6): 885-891.(in Chinese)[5]YU R H, LIU T X, XU Y P, et al. Analysis of salinization dynamics by remote sensing in Hetao Irrigation District of North China [J]. Agricultural water management, 2010, 97(12): 1952-1960.[6]FENG Z Z, WANG X K, FENG Z W. Soil N and salinity leaching after the autumn irrigation and its impact on groundwater in Hetao Irrigation District, China [J]. Agricultural water management, 2005, 71(2): 131-143.[7]王少丽, 焦平金, 许迪, 等. 新疆旱区浅层土盐分动态及其影响因素 [J]. 排灌机械工程学报, 2013, 31(7): 623-628. WANG Shaoli, JIAO Pingjin, XU Di, et al. Variation trends and influencing factors of shallow soil salinity in arid area of Xinjiang [J]. Journal of drainage and irrigation machinery engineering, 2013, 31(7): 623-628.(in Chinese)[8]李亮, 李美艳, 王世锋, 等. 河套灌区解放闸灌域盐荒地积盐量分析 [J]. 排灌机械工程学报, 2015, 33(5): 434-441. LI Liang, LI Meiyan, WANG Shifeng, et al. Analysis of salt accumulation in wasteland of Jiefangzha irrigation field in Hetao irrigation district [J]. Journal of drainage and irrigation machinery engineering, 2015, 33(5): 434-441.(in Chinese)
