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Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (14): 159-163.doi: 10.11924/j.issn.1000-6850.casb15110123

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Variation Characteristics of Arid Farmland Soil Moisture in Spring and Autumn in Guide, Qinghai

Ji Shangma1, Guo Lianyun2   

  1. (1Xinghai Meteorological Bureau of Qinghai, Xinghai Qinghai 813399;2Meteorological Bureau in Hainan Prefecture of Qinghai Province, Gonghe Qinghai 813099)
  • Received:2015-11-24 Revised:2016-04-30 Accepted:2015-12-24 Online:2016-05-17 Published:2016-05-17

Abstract: The variation characteristics of 0-30 cm soil moisture in Guide, Qinghai were analyzed based on the arid farmland soil moisture data of Guide weather bureau from 2002 to 2014. The results showed that soil moisture of 0-30 cm layer in arid farmland decreased significantly in spring during 2002 to 2014, but it showed an insignificant increasing trend in autumn, interannual variation was obvious. Soil moisture content in each soil layer followed the same change rule, but the variation amplitude of autumn was higher than that of spring. The highest and lowest soil moisture content of 0-10 and 10-20 cm soil layer presented in late September and early March, while the highest and lowest soil moisture content of 20-30 cm layer presented in early October and mid-April. Since 2000, the spring air temperature rose significantly, but the precipitation had no apparent change, while the average autumn temperature increase was not obvious, but the precipitation increased significantly. This climate trend was consistent to the conclusion that the soil moisture content decreased year by year in spring and increased year by year in autumn.