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以河北平原区望都灌溉试验站为例,选取210m×210m的正方形田块进行试验,在该范围内布置64个测点,分别测量0~30、30~50、50~80cm三个深度的土壤含水率信息。利用经典统计和地统计方法分析了田间土壤含水率的空间变异结构,并采用协同克里格插值技术得到了该区域土壤含水率的空间分布状况。结果表明,0~30cm土层及50~80cm土层的土壤含水率具有中等空间相关性,其相关距离分别为66.4、75.7m,而30~50cm土层表现出了强烈的空间相关性,相关距离为88.2m,研究结果可为实现灌区精准灌溉和土壤墒情预测提供科学的理论指导。
Taking Wangdou Irrigation Experimental Station in Hebei Plain as an example, 210m × 210m square plots were selected for testing. Within this range, 64 measuring points were set up to measure soil depths of 0-30, 30-50 and 50-80cm respectively Moisture content information. The spatial variability of soil moisture content in field was analyzed by using classical statistics and geostatistical methods. The spatial distribution of soil moisture content in this area was obtained by using the collaborative Kriging interpolation technique. The results showed that the soil moisture of 0 ~ 30cm soil layer and 50 ~ 80cm soil layer had a moderate spatial correlation with the correlation distances of 66.4 and 75.7m, respectively. However, the spatial correlation of soil moisture in 30 ~ 50cm soil layer showed a strong correlation The result is 88.2m, which can provide scientific theoretical guidance for the precision irrigation and soil moisture prediction in irrigation area.