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[1]DU Haotian,JIAO Feng,YAO Jing,et al.Effects of Precipitation Changes on Soil Moisture Characteristics of Returning Farmland in Loess Hilly Region[J].Research of Soil and Water Conservation,2019,26(05):81-88.

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Effects of Precipitation Changes on Soil Moisture Characteristics of Returning Farmland in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 81-88 Column: Public date: 2019-09-06

Title:: Effects of Precipitation Changes on Soil Moisture Characteristics of Returning Farmland in Loess Hilly Region

Author(s):: DU Haotian¹, JIAO Feng^1,2, YAO Jing¹, LI Dongdong², FANG Zhao²; 1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China

Keywords:: loess hills; returning farmland; soil moisture; precipitation change

CLC:: S152.7

DOI:: -

Abstract:: In order to study the characteristics of soil water change and its response to precipitation changes, this paper takes the returned grassland in the Yanhe River Watershed of the Loess Plateau as the research object, and continuously conducts the positioning observation of soil moisture under different rainfall gradients (0,±20%, ±40%, ±60%, ±80%) in the natural restoration area. The results showed that:(1) with the change of seasonal precipitation during the year, the soil water content in the growing season showed the ‘W’ shape fluctuation; (2) with the increase of rainfall gradient, the soil moisture content of each soil layer showed the same trend, showing ‘M’ Type change; (3) soil moisture content can be maintained at a high level from May to September under -20% of rainfall, indicating that proper drought treatment can help maintain high soil water content. However, rainfall reduced by more than 40% or rainfall increased by more than 60% is not conducive to the accumulation of soil moisture; (4) the soil water content of 0-30 cm soil layer has the most obvious response to precipitation, and the response gradually decreases with the increase of soil depth. Maintaining and utilizing shallow surface water is the key to vegetation restoration.

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