摘要
【目的】分析干旱盐渍化灌区非饱和一饱和带水盐的时空分布特征及其内部关联度，为内蒙古河套灌区盐渍化防治提供理论依据。【方法】运用经典统计学和地质统计学方法，分析了内蒙古河套灌区隆胜试验示范区作物播种前、生育期、收割后土壤水盐的时空变异特征，并利用灰色关联分析对不同地下水埋深条件下的土壤含水量、土壤含盐量、地下水埋深和地下水矿化度进行了交叉综合排序。【结果】内蒙古河套灌区隆胜试验示范区在播种前、生育期、收割后的土壤含水量和地下水埋深均呈中度偏弱变异性，而表层（0～40cm）土壤含盐量和地下水矿化度均呈中度偏强变异性。表层土壤含水量、含盐量均表现出北高南低的空间分布趋势，地下水埋深呈北浅南深趋势，地下水矿化度分布为西北高东南低。对不同地下水埋深条件下的水盐因子进行关联度分析发现，当地下水埋深年均值为1．5m时，对地下水埋深关联度最大的因子为土壤含水量（关联度为0．7261），土壤含水量、土壤含盐量和地下水矿化度均以地下水埋深为最大关联因子（关联度依次为0．7240，0．6832，0．6432）；在地下水埋深年均值为2．0m条件下，各因素间灰色关联度达到相对平衡状态；当地下水埋深年均值为2．5m时，土壤含盐量与土壤含水量、地下水埋深与地下水矿化度互为关联度最大的因子。【结论】建议采取合理措施降低研究区北部地下水埋深，防止区域土壤盐渍化加剧。
[Objective] Spatial and temporal distribution characteristic and inner correlation of water- salt in unsaturated-saturated zone at regional scale in drought and salinization irrigation area were analyzed to provide theoretical basis for salinization prevention and control in Inner Mongolia Hetao Irrigation District. [Method] The spatial and temporal distribution characteristics of water and salt were analyzed at the stages of before sowing,plating season and after harvest in Longsheng experimental demonstration zone in Inner Mongolia Hetao Irrigation District using classical statistics and geostatistics. Besides,grey relational degree method was used to conduct cross comprehensive sorting on soil moisture content, soil salinity, groundwater table,and groundwater salinity at different depths. [Result] In Longsheng test demonstration region in Hetao Irrigation District of Inner Mongolia, soil water content and groundwater depth before seeding,at planting date and after harvest had moderate to weak variability. The surface soil （0-40 cm） salt content and groundwater salinity showed strong to moderate variability. Surface soil moisture and salt content showed high variability in north and low in south, and groundwater depth distribution was characterized by low in north and high in south, while the groundwater salinity distribution was characterized by low in southeast and high in northwest. The relational grade analysis between water and salt under different depths of groundwater showed that the highest correlation factor for the depth of groundwater was soil moisture （correlation of 0. 726 1） when the groundwater depth average was about 1. 5 m. Groundwater depth was also the maximum correlation factor for soil moisture, salt content and groundwater salinity in groundwater with correlation coefficients of 0. 724 0,0. 683 2,and 0. 643 2, respectively. When the groundwater depth average was 2.0 m, the grey relational degree between every factor reached relative balanced state. When the groundwater depth was 2
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2015年第8期165-173,共9页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目"内蒙古河套灌区农田水土环境安全因子限制下引黄水量阈值与环境预报研究"(51469021)
内蒙古自治区自然科学基金项目"河套灌区影响农田生态安全的环境因子试验研究"(2014MS0335)
内蒙古水利科技项目"河套灌区影响作物生长的限制因子筛选研究"(NSK201407)
关键词
水盐分布
盐渍化灌区
灰色关联分析
克里格插值
河套灌区
distribution of the water and salt
salinization irrigation district
grey relational analysis
Kriging interpolation
Hetao Irrigation District
