黑土坡耕地水保措施下土壤水分时空变异分析

Spatial-temporal variation of soil moisture under the soil and water conservation in black soil sloping farmland

利用经典统计学和地统计学对黑土坡耕地水保措施下土壤水分含量的时空变异规律进行研究,结果表明,黑土坡耕地土壤水分呈现中等强度的空间异质性,水土流失对土壤含水量的影响可达2 km,采取水保措施可逐渐减弱其空间异质性,对土壤水分的影响可缩短到100 m以内。不同水保措施对减弱土壤水分空间变异程度表现不同,其中梯田和地埂植物带最为显著。合理使用人工水保措施是黑土坡耕地高效管理的重要措施。

Spatial-temporal variation of soil moisture and its spatial correlations were analyzed with the classical statistics and geostatistics in a black soil sloping farmland under soil conservation measures. Results showed that the soil moisture in the farmland was moderate spatial heterogeneity. The distance of soil moisture influenced by soil erosion was 2 km, and the soil and water conservation measures decreased the spatial heterogeneity gradual y, the distance of soil moisture influenced by soil erosion could be reduced to 100 m.The degree of different measures to decrease soil water spatial variability were different. The soil and water conservation mearsures of the terraces and interval earth bank did the best. Hence, suitable soil and water conservation measures are the important measures for the management in black soil sloping farmland.