农业科学研究2025，Vol.46Issue(4)：47-56,10.DOI:10.13907/j.cnki.nykxyj.2025.04.006
宁夏银北地区盐渍化土壤水盐变异特征
Variation Characteristics of Soil Water and Salt of Salinized Soil in Yinbei Area of Ningxia
摘要
Abstract
Due to the influences of climate and topography,soil salinity profiles in the Yinbei area of Ningxia exhibit considerable spatial and temporal heterogeneity.This study employs geostatistical methods and isocontour mapping to analyze the variation characteristics of soil water and salt,thereby facilitating a systematic understanding of the distribution patterns of these factors and providing a theoretical foundation for the prevention and scientific utilization of low-lying saline soils in the Yinbei irrigation area of Ningxia.The research focuses on an area of 103 hm2 of cultivated land and afforested land at the Saline-Alkali Land Improvement Experimental Station in Pingluo County in northern Yinchuan.Soil samples were collected through stratified sampling,incorporating both field surveys and laboratory analyses to measure soil moisture and salinity.The spatial distribution characteristics of soil water and salt were assessed through geostatistics and Kriging interpolation,resulting in the generation of contour maps.The results show that:① In the 0～100 cm soil profiles,water content exhibits weak to moderate variability,while salinity shows moderate variability,with both water and salt variability decreasing with increasing soil depth;② Water content in the 0～20 cm soil layer is influenced by both spatial structures and random factors,whereas below 20 cm,it displays strong spatial correlation.Soil salinity is primarily influenced by natural structural factors,with minimal contributions from human-induced random factors;③ The predominant soil types in the study area are of moderate salinity,exhibiting medium variability and strong spatial variability due to autocorrelation,with spatial structure characteristics of salinity well described by Gaussian and Exponential models;④ Notably,areas with sparse forest and grass to the north exhibit significan soil salinization,while the southern area benefits from drainage ditches that effectively facilitate salt leaching.Thus,a comprehensive drainage system is vital for maintaining water-salt balance in agricultural fields.This study elucidates the spatiotemporal variations of water and salt in the low-lying saline soils of Yinbei,Ningxia,providing a theoretical basis for their prevention and utilization.关键词
土壤盐分/半方差函数/地统计学/变异特征Key words
soil salinity/semi-variances/geostatistics/variation characteristics分类
农业科技引用本文复制引用
李沛峰,吴兰,王旭..宁夏银北地区盐渍化土壤水盐变异特征[J].农业科学研究,2025,46(4):47-56,10.基金项目
宁夏回族自治区重点研发计划项目(2022BBF03032-03) （2022BBF03032-03）
国家重点研发计划项目(2021YFD1900605-05) （2021YFD1900605-05）
宁夏回族自治区农业科技自主创新项目(NGSB-2021-11-03) （NGSB-2021-11-03）
农业基础性长期性科技工作观测监测(NAES091AE18)等项目联合资助 （NAES091AE18）
