农业机械学报2017，Vol.48Issue(4)：198-205,8.DOI:10.6041/j.issn.1000-1298.2017.04.026
黄土高原南北样带不同土层土壤容重变异分析与模拟
Variation Analysis and Simulation of Soil Bulk Density within Different Soil Depths along South to North Transect of Loess Plateau
摘要
Abstract
To provide soil hydraulic parameters for simulating soil hydrological processes,classical statistics were used to characterize the spatial distribution of soil bulk density (BD) within different soil depths (0 ～ 10 cm,10 ～20 cm and 20 ～40 cm) along south to north transect of the Loess Plateau.Furthermore,the multiple stepwise regressions,pedotransfer functions and the first order autoregressive state-space models were applied to simulate the distribution of BD.The magnitude of BD variability in the 0 ～ 20 cm soil layer was moderate according to the coefficient of variations,while the BD variability in the 20～ 40 cm soil layer was weak.The key factors affecting the spatial distribution of BD differed in different soil depths.Soil organic carbon,clay and sand contents were the key factors in the 0 ～ 10 cm soil layer;soil organic carbon content,clay and sand contents and precipitation were the key factors in the 10 ～20 cm soil layer;while in the 20 ～40 cm soil layer,clay and sand contents,precipitation and land use were the key factors to affect the spatial distribution of BD along south to north transect.Statespace models were consistently more effective than multiple stepwise regression functions and pedotransfer functions for estimating spatial distribution of BD.State-space model that included clay and sand contents,precipitation and land use factors showed the best simulation result,and the combination of such variables explained 92.3％ of the total variation of BD.State-space models were recommended for studying spatial relations between soil bulk density and other variables on the Loess Plateau.关键词
容重/状态空间/传递函数/模拟/空间变异Key words
bulk density/state-space/pedotransfer function/simulation/spatial variation分类
农业科技引用本文复制引用
易小波,邵明安,赵春雷,张晨成..黄土高原南北样带不同土层土壤容重变异分析与模拟[J].农业机械学报,2017,48(4):198-205,8.基金项目
国家自然科学基金项目(41530854、41501233) （41530854、41501233）
