基于最大有效持水率的区域土壤墒情监测点布设方法

Monitoring and Setting Method of Regional Soil Moisture Based on Maximum Effective Water Holding Capacity

【目的】准确获取区域土壤墒情,有效提升农业用水管理水平,支撑现代农业发展。【方法】基于经典统计学和地统计学方法,以土壤最大有效持水率为关键参数,构建土壤墒情监测点的优化布设方法,并以北京市大兴区冬小麦田为例进行验证。【结果】试验区土壤最大有效持水率在土层深度为0~20、20~40、40~60、60~80 cm以及0~40、0~80 cm的均值都表现为中等程度变异;0~40、0~80 cm土层深度的空间区域合理监测数分别为6个和4个,且确定了监测点的位置坐标;优化布设点监测值与全区域61个监测点实测平均土壤墒情相比,误差均在10%以内。【结论】基于最大有效持水率的区域土壤墒情监测点布设方法能够在保证区域土壤墒情监测精度的情况下,大幅减少监测点布设数量。

【Objective】The purpose of this paper is to make accurate acquisition of regional soil moisture can effectively improve the level of agricultural water management and support the development of modern agriculture.【Method】Based on the classical method and geostatistics,the maximum effective water holding capacity of soil was used as the key parameter to construct the optimal layout method of soil moisture monitoring points,and took the winter wheat field in Daxing District of Beijing as an example to verify method.【Result】The maximum effective water holding capacity of soil in the experimental area has moderate variation at the soil depth of 0~20 cm,20~40 cm,40~60 cm,60~80 cm and 0~40 cm,0~80 cm;The reasonable monitoring points number of 0~40 cm and0~80 cm soil depth is 6 and 4,respectively,and the location coordinates are determined;Compared with the average soil moisture content of 61 monitoring points in the whole region,the error of the monitoring value of the optimized monitoring point was within 10%.【Conclusion】The method of arranging soil moisture monitoring point based on the maximum effective water holding capacity can greatly reduce the number of monitoring points when the condition of ensuring the monitoring accuracy of regional soil moisture.