Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (14): 116-122.doi: 10.11924/j.issn.1000-6850.casb2020-0584

Special Issue: 资源与环境 农业气象

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Climate Change Characteristics of Soil Moisture in Forage Growing Season in Hezuo of Gannan Plateau

Ning Heping1(), Liu li1, Luan Zhenbin2, Luo Wangjun3   

  1. 1Longnan Meteorological Bureau of Gansu Province, Gansu Wudu 746000
    2Tanchang County Meteorological Bureau of Gansu Province, Gansu Tanchang 746500
    3Gannan Meteorological Bureau of Gansu Province, Gansu Hezuo 747000
  • Received:2020-10-23 Revised:2021-03-04 Online:2021-05-15 Published:2021-05-19

Abstract:

Based on the soil moisture data which were observed in forage growing season (April to September) in Hezuo of Gannan, Gansu Province from 1994-2013, we analyzed the depth variation characteristics of soil moisture in the area. The results show that the soil moisture in Hezuo exhibits an increasing trend during forage growing season, especially in the surface layer of 10 cm. And the trend weakens as the depth increases. In terms of seasonal change, the soil moisture of the whole layers is low in mid-June and mid-August, and high in mid-July, late July and September. The mutation detection analysis indicates that the moisture of both 20cm and 40cm soil layer in Hezuo present a jump increase. Soil moisture during summer is positively correlated with summer air temperature and precipitation in Hezuo, and the correlation with precipitation is more significant, showing a good consistency in the variation trend. The biomass of forage in each month in the growing season is closely related to previous soil moisture, which means that the soil moisture has positive contribution to forage yield.

Key words: Gannan Hezuo, subalpine meadow, forage grass, soil moisture, variation characteristics

CLC Number: