基于数值模拟的土壤水力参数对土壤水长程相关性的影响分析  

Effects of Soil Hydraulic Parameters on Long-range Correlation of Soil Moisture Based on Numerical Simulation

作　　者：李玲[1] 武冬冬 王铁军 狄崇利 LI Ling;WU Dongdong;WANG Tiejun;DI Chongli(Institute of Surface-Earth System Science,School of Earth System Science,Tianjin University,Tianjin 300072;Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim,Tianjin 300072)

机构地区：[1]天津大学地球系统科学学院表层地球系统科学研究院,天津300072 [2]天津市环渤海关键带科学与可持续发展重点实验室,天津300072

出　　处：《水土保持学报》2022年第1期80-85,94,共7页Journal of Soil and Water Conservation

基　　金：国家重点研发计划项目(2019YFC1804400);国家自然科学基金项目(42171036)。

摘　　要：为探究不同气候条件下土壤水力参数对土壤水长程相关性的影响,利用HYDRUS-1D模型,以湿润、半干旱和干旱气候区的气象数据为驱动,结合生成的砂土和黏壤土土壤水力参数集,模拟生成土壤水时间序列集;而后,利用去趋势波动分析法对生成的土壤水数据进行长程相关性分析。结果表明:(1)土壤水标度指数(h)介于0.570~1.915,土壤水中存在显著的长程相关性。砂土中土壤水变化主要表现为持续性,黏壤土中持续性和反持续性均较为显著。(2)土壤水长程相关性与土层深度、黏粒含量、干旱指数存在正相关关系。(3)影响土壤水长程相关性的主要土壤水力参数包括土壤孔隙分布参数(n)、进气值倒数(α)和饱和导水率(K_(s))。在砂土中,n是所有气候区中土壤水长程相关性的主要控制参数;在黏壤土中,α是湿润区、α和K_(s)是干旱和半干旱区土壤水长程相关性的主要控制参数。研究结果为揭示土壤水长期演变机理提供依据。To investigate the effects of soil hydraulic parameters on the long-range correlation of soil moisture under different climatic conditions,a 1-D vadose zone model(HYDRUS-1D)was utilized to simulate soil moisture time series under different climatic conditions in China(humid area,semi-arid area,and arid area)using generated soil hydraulic parameters datasets for sandy and clay loam soils.Then,the long-range correlation of soil moisture data was calculated by detrend fluctuation analysis.The results showed that:(1)The scale exponent(h)of the simulated soil moisture ranged from 0.570 to 1.915,indicating that there was an obvious long-range correlation.Soil moisture time series was mainly characterized by persistence for sandy,but for clay loam,there were both persistence and anti-persistence.(2)The long-range correlation was positively correlated with the soil depth,clay fraction,and aridity index.(3)The main soil hydraulic parameters affecting long-range correlation were n,α,and K_(s).Specifically,n was the main hydraulic parameter affecting long-range correlation for sandy soils at all locations.For clay loam soils,αwas the predominant hydraulic parameter affecting long-range correlation in humid area,αand K_(s) were the main hydraulic parameters affecting long-range correlation in semi-arid and arid areas.The results can provide some reference for revealing the long-term evolution mechanism of soil moisture.

关 键 词：土壤水 长程相关性 去趋势波动分析法 HYDRUS-1D 土壤水力参数 

分 类 号：S152.7[农业科学—土壤学]