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[1]ZHANG Xuanhua,HUANG Yanan,LI Zhi.Multi-factor Combined Action and Main Controlling Factors of Soil Water in Deep Loess Profiles in Northern Shaanxi[J].Research of Soil and Water Conservation,2023,30(03):173-180,187.[doi:10.13869/j.cnki.rswc.2023.03.025]

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Multi-factor Combined Action and Main Controlling Factors of Soil Water in Deep Loess Profiles in Northern Shaanxi

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 173-180,187 Column: Public date: 2023-04-10

Title:: Multi-factor Combined Action and Main Controlling Factors of Soil Water in Deep Loess Profiles in Northern Shaanxi

Author(s):: ZHANG Xuanhua, HUANG Yanan, LI Zhi; (College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: soil moisture; vegetation change; soil factors; wavelet coherence

CLC:: S152.7⁺5

DOI:: 10.13869/j.cnki.rswc.2023.03.025

Abstract:: [Objective]It is important to investigate the relationship between soil water and each environmental factor in the deep profile after vegetation change in the Loess Plateau and to identify the main controlling factors for the comprehensive regulation of soil water. [Methods] Soil samples were collected from farmland, grassland and the 15 m depth of the habitation of salix psammophila and Populus in Dingbian County, northern Shaanxi. The soil samples were analysed using traditional statistics and wavelet coherence analysis. [Results] The order of magnitude of soil water content and storage in 0—15 m was farmland>grassland≈salix psammophila>poplar, with water deficit of 810 mm, 1 375 mm, 1 371 mm and 1 762 mm, respectively. Based on wavelet coherence analysis of control factors, soil electrical conductivity(EC)was found to be the single dominant factor explaining water transport, and the area of positive correlation between EC and soil water was found throughout the scales. The two-factor combinations that combined effect of farmland are EC and sand, and magnetic susceptibility and sand for the lands grown salix psammophila and poplar. The two-factor combinations enhanced the degree of coherence mainly at large scales. [Conclusion] Deep soil water is more influenced by soil properties, but plant root conditions can seriously perturb the relationship between water and soil properties.

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Last Update: 2023-04-10