[1]LIANG Haibin,XUE Yayong,AN Wenming,et al.Effects of Different Revegetation Types on Soil Desiccation in the Loess Plateau[J].Research of Soil and Water Conservation,2018,25(04):77-85.
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Effects of Different Revegetation Types on Soil Desiccation in the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 77-85 Column: Public date: 2018-06-13
Title:
Effects of Different Revegetation Types on Soil Desiccation in the Loess Plateau
Author(s):
LIANG Haibin1,2, XUE Yayong3, AN Wenming1,2, WANG Shuai1, LI Zongshan1, Lü Yihe1
1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory of West China’s Environmental System, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
Keywords:
soil desiccation; grain-for-green project; soil moisture; the Loess Plateau
CLC:
S727.21;S157
DOI:
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Abstract:
Soil moisture is the main limiting factor affecting vegetation restoration in the vast Loess Plateau. Since Grain-for-Green Project was conducted in 1999, vegetation coverage has increased significantly, and soil and water loss has been alleviated. However, on the other hand, as ecological water use of vegetation increased, it has resulted in decrease of soil moisture content and aggravated soil desiccation. Soil desiccation has been seriously threatened the sustainable and healthy use of soil water resource as well as the vegetation construction. In the present study, a representative county, Wuqi County, located in northwestern Loess Plateau, was selected. Four different revegetation types (Robinia pseudoacacia, Prunus armeniaca, Caragana korshinskii, Hippophae rhamnoides) with various forest ages (10-year, 15-year, 18-year, 20-year, 25-year, 30-year, 38-year, 42-year as well as 50-year) were selected to measure the soil moisture contents and soil desiccation intensity in 0—500 cm soil profiles. Soil moisture availability, together with desiccated soil layers’ recovery was also estimated based on annual crop water consumption. The results indicated that soil moisture contents of different revegetation types decreased from surface to deep soil layers, soil moisture in 0—100 cm soil depth varied actively, while below 100 cm it kept relatively stable; as forest age increased, soil moisture contents, available soil moisture storage gradually declined, while soil moisture over consumption showed an increasing tendency; soil moisture content in Robinia pseudoacacia was lower than that in Caragana korshinskii and Hippophae rhamnoides shrub-lands with the same forest age, whereas soil moisture content in Prunus armeniaca was a little higher than even-aged Caragana korshinskii; moreover, there was no infiltration gravitational moisture and most easily available soil moisture in each sampling plot; with the increase of forest age, relative soil moisture and the ratio of easily available soil moisture to soil profiles decreased, while the thickness of moderately available and hard-unavailable soil moisture gradually increased. In conclusion, soil desiccation intensity and the thickness of desiccated soil layers gradually increased along with the increase of forest age and soil depth, furthermore, both the time and difficulty required for soil desiccation recovery to the stable soil moisture escalated.
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