考虑入渗空间分布变异性的适宜土壤紧实度采样密度分析  

Analysis of sampling density for suitable soil compaction considering spatial variability of soil infiltration

作　　者：刘姗姗[1,2] 许迪[1,2] 白美健[1,2] 章少辉[1,2] 

机构地区：[1]国家节水灌溉工程技术研究中心(北京),北京100048 [2]中国水利水电科学研究院水利研究所,北京100048

出　　处：《水利学报》2015年第3期307-314,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(51279225);国家863计划重点项目课题(2011AA100505);国家支撑课题(2012BAD08B05)

摘　　要：土壤入渗采样密度直接影响其空间分布变异性的合理表征,进而影响畦灌性能评价与系统设计。本文基于新疆供试田块上获得的实测数据,借助地质统计学和条件模拟方法分析不同土壤紧实度采样密度下简化的Green-Ampt入渗模型参数的统计特征值、空间变异结构与状况,对比不同土壤紧实度采样密度对畦灌性能模拟效果的影响,综合确定适宜的土壤紧实度采样密度。结果表明,当土壤紧实度采样密度大于50个/hm2时,简化的Green-Ampt入渗模型参数的变程和空间分布状况在田块尺度上都趋于稳定,而畦田尺度上的畦灌性能评价指标模拟值与实测值间的相对误差均保持在10%以内,故适宜的土壤紧实度采样密度值应为不低于50个/hm2。Sampling density greatly affects the rational investigation of the spatial distribution variability of soil infiltration, and subsequently affects performance evaluation and design of basin system. In this study, the statistical characteristics, spatial variability structure and spatial distribution of simplified G-A infiltra-tion model parameters were analyzed using the methods of geo-statistics and conditional simulation, based on measured data obtained from experiment field in Xinjiang Uygur Autonomous Region,China. Meanwhile, the impacts of soil compaction sampling density on simulation effects of basin irrigation performance were analyzed in order to determine the suitable soil compaction sampling density. The results showed that the range and spatial distribution of simplified G-A infiltration model parameters tend to stabilize in the field scale when the sampling density of soil compaction is more than 50 per ha. Moreover, the relative errors between observed data and simulated data of basin irrigation performance evaluation indexes are less than 10% in the border check scale. Therefore, the appropriate sampling density of soil compaction is not less than 50 per ha.

关 键 词：入渗 空间变异 采样密度 条件模拟 土壤紧实度 

分 类 号：S152.7[农业科学—土壤学] S275.3[农业科学—农业基础科学]