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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。
The sampling density of soil infiltration directly affects the reasonable characterization of its spatial distribution variability, and then affects the evaluation of slug irrigation performance and system design. In this paper, based on the measured data obtained from the test plots in Xinjiang, the statistical eigenvalues, the spatial variability structure and status of the simplified Green-Ampt infiltration model parameters under different soil compaction sampling densities were analyzed by using geostatistics and conditional simulation methods. Comparing the effect of different soil compaction sampling density on the simulation results of furrow irrigation performance, the suitable soil compaction sampling density was comprehensively determined. The results show that when the sampling density of soil compaction is more than 50 / hm2, the parameters of the simplified Green-Ampt infiltration model tend to be stable in field scale and spatiotemporal distribution, The relative error between the simulated value and the measured value of the evaluation index is kept within 10%, so the appropriate sampling density of soil compaction should be not less than 50 / hm2.