黑土区农田尺度田间持水率的空间变异性研究  

Spatial Heterogeneity of Field Capacity of Chernozem Soil in Northeast of China

作　　者：刘继龙 徐清 李林[2] 付强 王小慧 马博思 闫佳铭 刘海岳 LIU Jilong;XU Qing;LI Lin;FU Qiang;WANG Xiaohui;MA Bosi;YAN Jiaming;LIU Haiyue(School of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin 150030,China;College of Water Conservancy and Architecture Engineering,Tarim University,Alar 843300,China)

机构地区：[1]东北农业大学水利与土木工程学院,哈尔滨150030 [2]塔里木大学水利与建筑工程学院,新疆阿拉尔843300

出　　处：《灌溉排水学报》2021年第2期55-61,124,共8页Journal of Irrigation and Drainage

基　　金：国家自然科学基金重点项目(51439006);国家自然科学基金项目(51409046);黑龙江省自然科学基金项目(E2018005)。

摘　　要：【目的】探究黑土区农田田间持水率的空间变异性机制。【方法】利用传统统计学和多重分形方法量化了田间持水率的空间变异强度,分析了造成田间持水率空间变异性的局部信息;利用联合多重分形方法确定了田间持水率与土壤基本物理特性在多尺度上的相关性。【结果】研究区域田间持水率具有多重分形特征,随土层深度增加,田间持水率的空间变异程度先降后增;田间持水率的大值数据对0~5 cm和10~15 cm土层田间持水率空间变异性的贡献较大,小值数据对5~10 cm和15~20 cm土层田间持水率空间变异性的贡献较大;单一尺度上,与田间持水率相关程度最高的土壤基本物理特性在0~5 cm土层是黏粒量和土壤体积质量,在5~10 cm和10~15 cm土层是粉粒量和黏粒量,在15~20 cm土层是土壤体积质量和粉粒量;多尺度上,与田间持水率相关程度最高的土壤基本物理特性在0~5、5~10和10~15 cm土层是黏粒量和粉粒量,在15~20 cm土层是土壤体积质量和粉粒量。【结论】黑土区农田田间持水率的空间变异程度为弱变异,田间持水率与土壤基本物理特性的相关程度在单一尺度和多尺度上有所差异。【Background】The soil moisture characteristic has the obvious spatial heterogeneity,and the determination of its spatial heterogeneity is the theoretical basis for the precision management of soil water.Field capacity is an important soil moisture characteristic parameter,at present,the study on the spatial heterogeneity of field capacity is relatively few.Furthermore,the soil degradation in chernozem soil is serious,the capacity of soil moisture preservation is decreasing,and the spatial heterogeneity of field capacity in chernozem soil is a scientific problem worthy of discussing.【Objective】The aim of this work is to explore spatial heterogeneity mechanism of field capacity in chernozem soil.【Method】Spatial heterogeneity degree of field capacity and local information causing its spatial heterogeneity were analyzed with traditional statistics and multifractal methods,and multi-scale relationship between field capacity and soil physical property were studied with joint multifractal method.【Result】􀀁Field capacity had multifractal characteristics,and its spatial heterogeneity degree first decreased and then increased with the increase of soil layer depth.The local information that caused spatial heterogeneity of field capacity was mainly its high value information in 0~5 cm and 10~15 cm soil layers,and was mainly its low value information in 5~10 cm and 15~20 cm soil layers.At the single scale,the most obvious soil physical property that correlated with field capacity was clay content and soil bulk density in 0~5 cm soil layer,was silt content and clay content in 5~10 cm and 10~15 cm soil layers,and was soil bulk density and silt content in 15~20 cm soil layer.At the multi-scale,the most obvious soil physical property that correlated with field capacity was clay content and silt content in 0~5 cm,5~10 cm and 10~15 cm soil layers,and was soil bulk density and silt content in 15~20 cm soil layer.【Conclusion】Spatial heterogeneity degree of field capacity was weak in farmland of chernozem soil.Rel

关 键 词：黑土区 田间持水率 空间变异性 多重分形 农田 

分 类 号：S152.7[农业科学—土壤学]