Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it

Abstract

Abstract: Employing LiCor 6400 gas exchange analyzer and soil respiration chamber attachment （LiCor Inc.,Lincoln,NE,USA）,this paper continuously measured the soil surface CO₂ effluxes on the sloping pasture of Heihe River basin from early April to late October 2003 to investigate the soil CO₂ efflux rate and its feedback to the changes of climate and land use.The results showed that from May to October,the diurnal variation of soil respiration was low at night,the lowest at 7:00,6:30,5:30,6:00 and 7:00,raised rapidly at 7:00～8:30,and then descended at 16:00～18:30.The maximum soil CO₂ efflux appeared at 15:00,14:30,14:30,13:30,14:00 and 15:00.The mean daily soil respiration rate was 0.31～6.98 μmol·m^-2·s^-1,with the maximum in July and August,the second in May and September,and nearly consistent in April and October.Soil respiration rate had an exponential and power correlation with temperature and soil moisture,respectively.

Key words: Soil respiration rate, Growth season, Temperature, Soil moisture, Sloping pasture, Heihe River basin

CLC Number:

S152.7

CHANG Zongqiang, SHI Zuomin, FENG Qi, SU Yonghong . Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it[J]. Chinese Journal of Applied Ecology, 2005, 16(9): 1603-1606.

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