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[1]LUO Xu,LI Jianping,ZHANG Yi,et al.Response of Spatial and Temporal Variation of Soil Moisture to Precipitation Change in Desert Steppe[J].Research of Soil and Water Conservation,2021,28(04):142-150.

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Response of Spatial and Temporal Variation of Soil Moisture to Precipitation Change in Desert Steppe

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 142-150 Column: Public date: 2021-08-10

Title:: Response of Spatial and Temporal Variation of Soil Moisture to Precipitation Change in Desert Steppe

Author(s):: LUO Xu¹, LI Jianping^1,2, ZHANG Yi¹, JING Le¹, WANG Yutao¹, ZHANG Juan¹; (1.School of Agriculture, Ningxia University, Yinchuan 750021, China; 2 Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China)

Keywords:: desert steppe; precipitation variation; different soil layers; soil moisture content; coefficient of variation; vegetation characteristics

CLC:: P426.6

DOI:: -

Abstract:: In order to investigate the response of spatial and temporal variation of soil moisture to precipitation in desert steppe, the desert grassland in the southern Mu Us sandy land as the research object, we used the way of artificial awnings and artificial filling water to simulate the 5 different precipitation gradients(33%, 66%, 100%, 133% and 166% of normal precipitation), to monitor soil moisture content in 0—200 cm soil layer by TDR technology, and to systematically examine effect of rainfall on change patterns of soil moisture retention in desert grassland. The results show that:(1)the soil moisture contents in all precipitation treatments reached the maximum values in July, and the soil moisture content in normal rainfall treatment was higher than that in other precipitation treatments;(2)soil moisture contents of different soil layers had different responses to rainfall changes, the moisture content of surface soil(0—40 cm)was the most sensitive to rainfall, soil moisture in 40—80 cm layer was relatively stable, with the increase of soil depth, the water content in the 120—200 cm layer was the largest;(3)the variation coefficient of soil moisture fluctuated in a small range between different precipitation treatments, while the variation coefficient of soil moisture content in deep layer was relatively small;(4)precipitation resulted in the increases of vegetation density and biomass;(5)there was a positive correlation between rainfall and soil moisture; under rain-controlled treatment, atmospheric temperature was positively correlated with shallow soil moisture. Therefore, in order to comprehensively explore the effects of precipitation on the spatial and temporal variation of soil moisture in desert steppe, it is necessary to consider the interaction between rainfall season and soil depth as well as the particularity of regional vegetation types.

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Last Update: 2021-08-20