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Position: Home > Articles > Effects of Soil Hydraulic Parameters on Long-range Correlation of Soil Moisture Based on Numerical Simulation Journal of Soil and Water Conservation 2022,36 (1) 80-85+94

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

作  者：
李玲;武冬冬;王铁军;狄崇利
单  位：
天津大学地球系统科学学院表层地球系统科学研究院;天津市环渤海关键带科学与可持续发展重点实验室
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
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。
译  名：
Effects of Soil Hydraulic Parameters on Long-range Correlation of Soil Moisture Based on Numerical Simulation
作  者：
LI Ling;WU Dongdong;WANG Tiejun;DI Chongli;Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University;Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim;
关键词：
soil moisture;;long-range correlation;;detrended fluctuation analysis;;HYDRUS-1D;;soil hydraulic parameter
摘  要：
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-1 D) 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, α was the predominant hydraulic parameter affecting long-range correlation in humid area, α and 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.

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