Research on characteristics and relationship of soil heat and moisture in summer on alpine grassland in Yellow River source region

Abstract

Abstract: On the basis of observed data, the spatial-temporal variation characteristics, relationship and interactions between soil temperature,water and soil heat flux are studied. The results shows that there exit same trend everyday on soil moisture in summer at alpine grassland in Yellow River source region. Soil moisture exit same trend in each month in summer. The average maximum value of soil moisture was 17.58 m³/m³, and reached in July 4 in each soil layer. The average minimum value of soil moisture was 6.83 m³/m³, and appeared in August 9 in each soil layer. The maximum value appeared from 16 to 17 O’clock, which was 15.26 m³/m³ in 10 cm soil layer from June to August. The minimum value appeared 8 O’clock, which was 14.49 m³/m³.The minimum value appeared 22 and 0 O’clock, which was 15.56 m³/m³ in 30 cm soil layer from June to August. The minimum value appeared from 11 to 13 O’clock, which was 15.32 m³/m³. Soil temperature exit same trend in each month in summer, soil moisture affected by soil temperature. The average maximum soil temperature value was 17.59℃, which appeared in July and August. The average minimum soil temperature value was 4.57℃, which appeared in June 1. Soil heat flux showed a sine curve change from July to August in 10 and 30 cm soil layer. The maximum and minimum values of soil heat flux were 67.35 and -21.62 W/m² in 10 cm soil layer. The maximum and minimum values of soil heat flux were 21.33 and -2.73 W/m² in 30 cm soil layer. Soil heat flux was more sensitive than soil temperature. Soil heat flux was declined with soil temperature decreased. The soil heat flux was negative, indicating that during this time soil heat transfer from soil to the atmosphere. The soil heat flux was positive, soil heat transfer from the atmosphere to the soil. Daily evapotranspiration was calculated by the formula of Penman and analyzed relationship with climatic factors. Wind speed was significantly affected on daily evapotranspiration, and wind speed and relative humidity were major factors on daily evapotranspiration change.

CLC Number:

S812.2

ZHANG Juan, LI Xiao-dong, LI Feng-xia, ZHOU Bing-rong. Research on characteristics and relationship of soil heat and moisture in summer on alpine grassland in Yellow River source region[J]. Acta Prataculturae Sinica, 2012, 21(6): 306-314.

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