Effect of grazing exclusion on soil respiration during the dormant season in alpine meadow grassland ecosystems on the northern shore of Qinghai Lake, China

doi:10.11686/cyxb20140610

Abstract

Abstract: Dormant season soil CO₂ efflux is a significant component of the ecosystem carbon cycle and it therefore plays an important role in carbon budgets calculated to address global climate change. This study investigates the response of dormant season soil CO₂ efflux to short-term grazing exclusion. It also explores the impacts of soil temperature and moisture on soil respiration using the Li-8100 system. Soil respiration was studied in three blocks-free-range grazing (FG), grazing exclusion for 3 years (GE₃), and grazing exclusion for 5 years (GE₅). Respectively, the average dormant season soil respiration was 0.21, 0.22, and 0.19 times of the annual average soil respiration in each of the three blocks. The carbon released by soil respiration during the dormant season was 117.2, 109.2 and 100.7 g/cm², accounted for 21.2%, 22.3% and 23.2% of the amount of annual carbon released from soil for FG, GE₃ and GE₅, respectively. The Q₁₀ values during the dormant season were lower than both the annual and growing season scores. Soil temperature and moisture almost equally account for the variation in soil respiration, and a certain amount of soil water content is necessary for maintaining the response of soil respiration to soil temperature. Therefore, when considering the carbon budget and cycle of ecosystems, we cannot ignore dormant season soil respiration; and soil moisture plays a considerable role in regulating this process.

CLC Number:

S812.2

CHEN Ji,CAO Jun-ji,WEI Yong-lin,LIU Ji-hong,MA Fu-lin,CHEN Di-chao,FENG Jia-yu,XIA Yao,CEN Yan. Effect of grazing exclusion on soil respiration during the dormant season in alpine meadow grassland ecosystems on the northern shore of Qinghai Lake, China[J]. Acta Prataculturae Sinica, 2014, 23(6): 78-86.

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