Soil respiration of Hulunber meadow steppe and response of its controlling factors to different grazing intensities

Abstract

Abstract: From June to September in 2010, soil respiration was measured at six different grazing intensities in experimental plots in Hulunber meadow steppe using a LI-6400-09 Soil Chamber to understand the influence of different grazing intensities on soil respiration of grassland. The controlling factors of soil respiration were taken into account under different grazing intensities. 1) Soil water content, root biomass, above ground biomass, and litter accumulation decreased with an increase of grazing intensity. However, soil temperature had an irregular change pattern with an increase of grazing intensity. 2) The dynamic changes in soil respiration rate have a double peak curve from different grazing intensities during the whole experimental period, while the varied mode of the mean value of soil respiration rate can be expressed as R₁ >R₀ >R₂ >R₃ >R₄ >R₅. There was no significant difference between R₀ and R₁. The soil respiration rate was higher in R₀ and R₁ treatments than in the R₅ treatment except on September 30th. Soil respiration rate was dramatically influenced by grazing intensity, with a more intense response under the R₄ and R₅ grazing intensities. 3) The effect of grazing intensiy on soil respiration changed with variation of grazing season or date showing there was an interaction between them. The partial correlation of time analysis has shown that soil temperature, soil water content, root biomass, above ground biomass, litter accumulation had significantly positive correlations with soil respiration under different grazing intensities but there was a significantly negative correlation with grazing intensities. The lower grazing intensity (R₁) had no adverse effect on soil respiration rate and its controlling factors, while the higher grazing intensities (R₄ and R₅) have obviously influenced them.

CLC Number:

S812.2

DENG Yu, LIU Xiao-ni, YAN Rui-rui, WANG Xu, YANG Gui-xia, REN Zheng-chao, XIN Xiao-ping. Soil respiration of Hulunber meadow steppe and response of its controlling factors to different grazing intensities[J]. Acta Prataculturae Sinica, 2013, 22(2): 22-29.

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