喷灌条件下农田土壤水分的空间变异性研究

本试验对喷灌区不同水分处理的麦田进行取样分析,分别测定0～10、10～20、20～40、40～60cm四个层次的土壤水分。应用传统统计学的方法对所取的数据进行了分析,结果表明10～20cm土层受降雨、蒸散和根系等因素的影响最大。通过地统计学的半方差函数分析,发现不同处理的同一层次、同一处理的不同层次的空间相关性均存在差异以及喷灌对土壤水分空间相关性的影响。比较各处理相应层次的变程,其随灌水量的增大而增大,表明喷灌区灌水多的处理水分分布更均匀。所得结论可用于提高水分利用效率和精确农业(灌水)的研究和实践。

A Study on Spatial Variability of Soil Moisture in Wheat Field Under Sprinkling Irrigation Condition

This experiment was carried in a wheat field with different water treatments under sprinkling irrigation conditions. Soil samples were obtained from each point under four layers of 0~10cm, 10~20cm, 20~40cm and 40~60cm. Soil water content was measured. The classical statistics was applied to analyze the data, and the results indicated that the 10~20 cm layer was affected most by rainfall and evapotranspiration. Further more, Semivariance analysis found that the difference of spatial correlation existed among different treatments with the same layer or different layers with the same treatment, and that effect of sprinkling irrigation on spatial correlation of soil moisture existed. In addition, when comparing the same layers’ range with different treatmented, range tended to increase and water was more uniformly distributed in the soil as the irrigating amount increased. These results showed some merits in increasing water use efficient and precision agriculture.