| Effects of conversion of cropland to forest measures on deep soil moisture in Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2017.05.19 |
| Key Words: deep soil water conversion of cropland to forest soil texture plant roots Loess Plateau |
| Author Name | Affiliation | | JIAO Rui | College of Natural Resources and Environment，Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHAO Ying | College of Natural Resources and Environment，Northwest A＆F University, Yangling, Shaanxi 712100, China | | SI Bing-cheng | College of Water Resources and Architectural Engineering，Northwest A＆F University Yangling, Shaanxi 712100, China | | LAN Zhi-long | College of Natural Resources and Environment，Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHANG Jian-guo | College of Natural Resources and Environment，Northwest A＆F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loss Plateau, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Deep soil water distribution has great significance for vegetation restoration and sustainable development of agriculture in Loess Plateau. In this study, soil samples in a depth of 20 m profile under different conversion of cropland to forest measures (artificial Chinese Arborvitae forest, artificial Chinese Pine forest and apple forest planted in 1979) and cropland (as contrast) were collected. The soil moisture concentration, roots distribution and soil clay concentration were measured. The results demonstrated that the conversion of cropland to forest measures significantly reduced soil moisture concentration. Cropland had the highest moisture concentration (11.30%) in the four types of land use, whereas there are small differences of soil moisture concentration among artificial apple forest (6.66%), Chinese Pine forest (6.48%) and Chinese Arborvitae forest (5.92%) had little differences in soil moisture concentration. Soil moisture concentration was influenced by plant roots and soil texture. Plant roots were the main factors affecting the deep soil moisture concentration, roots through the suction effect of reducing the soil moisture concentration. With the increasing of soil depth, the effects of roots on soil moisture concentration was gradually weakened whereas soil texture effect becomes more significant. The influence of depth is 18 m for Chinese Arborvitae forest, 16 m for Chinese Pine forest and is 19 m for old apple forest. |
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