| Biology and Soil |
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| Impact of Precipitation on Soil Moisture in Gansu Arid Agricultural Regions |
| CHEN Shao-yong1,2, GUO Yu-zhen2, ZHENG Yan-xiang2, WANG Jin-song1 |
1.Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China；
2.Baiyin Meteorological Bureau, Baiyin 730900, Gansu, China |
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Abstract This article analyzed relationship between soil moisture and precipitation in arid agricultural regions in Gansu province based on precipitation data from 1961—2007 of 35 weather stations and soil moisture data during April-October of 13 agricultural meteorological observation stations. Using the REOF method we divided the area into 4 sub-areas: east sub-area, mid-west sub-area, mid-east sub-area and south sub-area. Results show that: (1) In 0—100 cm soil layers, relation between 0—30 cm plow layer soil moisture and precipitation is best. (2) Yearly change tendencies of precipitation and soil moisture at plow layer in Gansu arid agricultural regions are consistent. Soil humidification time is basically consistent with the time of ten-day precipitation achieving 20 mm in each sub-area. (3) There is an extremely remarkable correlation between soil moisture at plow layer and precipitation. The sensitivity of soil moisture to precipitation decreases gradually along with the soil depth increase; the sensitivity is bigger in middle sub-area than in southeast sub-area. (4) Different grades of precipitation have different influence on the soil moisture. The soil moisture difference is extremely remarkable for different grades of precipitation. The soil moisture increase range is the biggest when precipitation grade change from slightly strong to strong. Lastly, soil moisture-precipitation regression equations are established.
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Received: 15 March 2011
Published: 20 January 2012
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2012, Vol. 32 
