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[1]PAN Zhan-bing,WANG Zhan-jun,LI Sheng-bao,et al.Effects of Slope Aspect and Position on Temporal and Spatial Variation of Soil Water Content on Alfalfa Land in Loess Hilly Region of South Ningxia Hui Autonomous Region[J].Research of Soil and Water Conservation,2010,17(02):141-144.

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Effects of Slope Aspect and Position on Temporal and Spatial Variation of Soil Water Content on Alfalfa Land in Loess Hilly Region of South Ningxia Hui Autonomous Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 02 Page number: 141-144 Column: Public date: 2010-04-20

Title:: Effects of Slope Aspect and Position on Temporal and Spatial Variation of Soil Water Content on Alfalfa Land in Loess Hilly Region of South Ningxia Hui Autonomous Region

Author(s):: PAN Zhan-bing¹, WANG Zhan-jun², LI Sheng-bao¹, ZHANG Yuan-run¹; 1. Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China;
2. Department of Returning Farmland to Forest, Ningxia Forestry Bureau, Yinchuan 750002, China

Keywords:: soil water content; alfalfa land; slope direction; slope position

CLC:: S152.7

DOI:: -

Abstract:: In order to research the effects of slope direction and position on soil water content on alfalfa land in loess hilly region of South Ningxia, the soil volumetric water content on 7-year-old alfalfa lands with different slope directions and positions was dynamically monitored by time domain reflectometer (TDR). The results showed that the soil drying degree was obvious and the status of soil water can be divided into 2 periods: water consumptive period concentration from March to July and water supplemental period concentration from August to October. The driest soil layer depth on alfalfa land with different slope directions showed differences. On west facing slope (shady slope), the depth was 40-60 cm, on south facing slope was 80-100 cm, and 100-120 cm on east facing slope (sunny slope). On west facing slope (shady slope), the average soil water content of 0-180 cm layer was the highest (13.8%), then the south slope, the east facing slope (sunny slope) had the lowest water content (12.8%). Influenced by rainfall redistribution, the order of average soil water content of 0-180 cm layer at different slope positions was downhill(13.69%) > mid-slope(13.61%) > uphill(12.29%). In 0-100 cm soil layer where the water content changed most actively, the order of soil water content in the same layer at different slope positions was CK > downhill > uphill > mid-slope. This suggested that soil became dry after alfalfa planting, and the drying situation was more serious at higher slope positions.

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