Spatial-temporal Patterns of Soil Water in Clay Layer at Inter-dune Area of Nitraria Tangutorum and Its Response to Rainfall Changes in Ulan Buh Desert

doi:10.13961/j.cnki.stbctb.2022.06.005

Home > Archive>Volume 42, Issue 6, 2022 >39-46. DOI:10.13961/j.cnki.stbctb.2022.06.005

Spatial-temporal Patterns of Soil Water in Clay Layer at Inter-dune Area of Nitraria Tangutorum and Its Response to Rainfall Changes in Ulan Buh Desert
DOI:
                        10.13961/j.cnki.stbctb.2022.06.005
                    
Author:
                        Li XinleLi Xinle
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China;Dengkou Station of New Plants Varieties Testing Center, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China
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Liu YajingLiu Yajing
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China;Dengkou Station of New Plants Varieties Testing Center, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China
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Sun FeiSun Fei
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China
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Wang DanyangWang Danyang
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China;Dengkou Station of New Plants Varieties Testing Center, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China
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An JingyuanAn Jingyuan
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China;Dengkou Station of New Plants Varieties Testing Center, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China
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Mu RenMu Ren
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China;Dengkou Station of New Plants Varieties Testing Center, National Forestry and Grassland Administration, Dengkou, Inner Mongolia 015200, China
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Zhang JingboZhang Jingbo
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China
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Abstract:

[Objective] The spatial-temporal patterns of soil water at the inter-dune area of Nitraria tangutorum nebkhas and its response to rainfall changes were determined in order to provide a scientific basis and data support for the accurate assessment of the role of inter-dunes in the soil water cycle and soil water stability in Nitraria tangutorum nebkhas. [Methods] The EM50 automated soil moisture measurement system was used to acquire long-term in-situ measurements of soil moisture in the clay layer of the inter-dune area. We analyzed the spatial patterns and temporal dynamics of soil water in the inter-dune soils under different rainfall conditions, quantifying the relationship between rainfall, soil water content before rainfall, and soil water infiltration and retention time in the inter-dune clay layer. [Results] ① From the perspective of the spatial variation characteristics of soil water in the clay layer, the variation degree of soil water in the 0-25 cm soil layer was characterized as moderate variation, among which the surface layer (0-15 cm) had greater variability and the lower layer (below 15 cm) had less variability. ② The magnitude of rainfall determined the infiltration depth and retention time of soil water at the inter-dune area after rainfall. As the average rainfall increased by 1 mm, the infiltration depth of soil water in the clay layer increased by 0.57 cm, and the soil water retention time increased by 1.05 days. Excessive soil water content before a rainfall event inhibited the continuous infiltration of soil water in the clay layer, but had a significant positive effect on soil water retention time after the rainfall, as shown by a 1% increase in soil water content before a rainfall event, and a 0.02 cm decrease in infiltration depth per unit rainfall, while the soil water retention time of the clay layer increased by 9.85 days. ③ Heavy rainfall events (＞20 mm) had an obvious replenishment effect on soil water in the clay layer, and the soil water decreased slowly after rainfall. [Conclusion] The inter-dune clay layer can inhibit soil water evaporation and provide good water storage and water retention.

Key words:Ulan Buh desert;clay layer between inter-dunes;soil water content;spatial pattern;time dynamics

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李新乐,刘雅婧,孙非,王丹阳,安景源,牧仁,张景波.乌兰布和沙漠白刺灌丛沙堆丘间地黏土层土壤水分时空格局及其对降雨变化的响应[J].水土保持通报英文版,2022,42(6):39-46

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Received:June 02,2022
Revised:July 04,2022
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Online: February 13,2023
Published: December 20,2022

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