文献类型：期刊文献

英文题名：Effects of Seasonal Freezing and Thawing on Soil Moisture and Salinity in the Farmland Shelterbelt System in the Hetao Irrigation District

作者：Luo, Chengwei[1,2,3] Wang, Ruoshui[1,3] Hao, Kexin[1,2] Jia, Xiaoxiao[1,2] Zhu, Junying[1,2] Xin, Zhiming[4,5] Xiao, Huijie[1,2]

第一作者：Luo, Chengwei

通信作者：Xiao, HJ[1];Xiao, HJ[2]

机构：[1]Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China;[2]State Key Lab Efficient Prod Forest Resources, Beijing 100083, Peoples R China;[3]Forest Ecosyst Studies, Natl Observat & Res Stn, Jixian 042200, Peoples R China;[4]Natl Forestry & Grassland Adm, China Inner Mongolia Dengkou Desert Ecosyst Natl O, Dengkou 015200, Peoples R China;[5]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou 015200, Peoples R China

年份：2024

卷号：14

期号：7

外文期刊名：AGRONOMY-BASEL

收录：;Scopus(收录号：2-s2.0-85199645650);WOS:【SCI-EXPANDED(收录号:WOS:001278181900001)】；

基金：This research was funded by the Provincial Scientific Research Projects of Inner Mongolia, China (2022YFHH0065), the National Key Research and Development Program of China (2023YFF1304204, 2023YFE0121800), the National Natural Science Fund (32371961), and Inner Mongolia Autonomous Region 'Unveiling the List and Leading the Project' (2024JBGS0002).

语种：英文

外文关键词：agroforestry; secondary salinization; soil freezing and thawing; machine learning model

摘要：Water resources are scarce, and secondary soil salinization is severe in the Hetao Irrigation District. Farmland shelterbelt systems (FSS) play a critical role in regulating soil water and salt dynamics within the irrigation district. However, the understanding of soil water and salt migration within FSS during the freeze-thaw period remains unclear due to the complex and multifaceted interactions between water and salt. This study focused on a typical FSS and conducted comprehensive monitoring of soil moisture, salinity, temperature, and meteorological parameters during the freeze-thaw period. The results revealed consistent trends in air temperature and soil temperature overall. Soil freezing durations exceeded thawing durations, and both decreased with an increasing soil depth. At the three critical freeze-thaw nodes, the soil moisture content at a 0-20 cm depth was significantly lower than at a 40-100 cm depth (p < 0.05). The soil water content increased with time and depth at varying distances from the shelterbelt, with an average increase of 7.63% after freezing and thawing. The surface water content at the forest edge (0.3H, 4H) was lower than inside the farmland (1H, 2H, 3H). Soil salt accumulation occurred during both freezing stable periods and melting-thawing periods in the 0-100 cm soil layer near the forest edge (0.3H, 4H), with the highest soil salinity reaching 0.62 gkg(-1). After the freeze-thaw period, the soil salt content in each layer increased by 11.41-47.26% compared to before the freeze-thaw period. Salt accumulation in farmland soil near the shelterbelt was stronger than in the far shelterbelt. The multivariate statistical model demonstrated goodness of fit for soil water and salt as 0.94 and 0.72, respectively, while the BP neural network model showed goodness of fit for soil water and salt as 0.82 and 0.85, respectively. Our results provide an efficient theoretical basis for FSS construction and agricultural water management practices.