Abstract: Soil respiration has been shown to be a major contributor to the carbon budget and plays an important role in the global carbon cycle.Global warming is anticipated to alter the patterns of global atmosphere circulation and hydrologic cycling, so it is necessary to study the responses of soil respiration to the precipitation affected by the altered hydrologic cycling.In this study,we controlled the soil moisture by 4 levels of irrigation modeling different precipitation and observed the soil respiration.We found that: one, irrigation could stimulate the soil respiration but much water could reduce the soil respiration rate especially shortly after the irrigation; two, the response of temperature sensitivity( i．E． Q₁₀ ) of soil respiration to the irrigation quantity was curvilinear with apparently less increase in per Q₁₀per unit of increase in irrigation quantity and even decreased at the higher values of irrigation quantity．

Key words: Soil respiration, Irrigation quantity, Q₁₀, Cropland

CLC Number: 

• S152.7