Response of Greenhouse Gases Emission Fluxes to Long-term Warming in Alpine Meadow of Northern Tibet

doi:10.3969/j.issn.1000-6362.2018.03.002

Abstract

Abstract:

To explore the effects of long-term climate warming on greenhouse gases(GHGs) flux in the alpine meadow, the simulated warming 2 years(2Y, 2015-2016) and 6 years(6Y, 2011-2016) experiments were conducted by the open top chamber(OTC) in an alpine meadow of Tibetan Plateau, then the dynamics of CO2, CH4 and N2O fluxes were measured during growing season. The observations showed that the CO2 flux during growing season was increased with 6Y and decreased with 2Y warming treatment, respectively, compared with the control. And the CO2 flux with 6Y warming treatment was significantly higher than that of 2Y treatment in July. The CH4 absorption flux was increased with 6Y and 2Y warming treatment, but the differences between treatments were not significant in the growing season. The N2O emission flux was showed 6Y＞2Y＞CK in the growing season, and the differences between treatments were not significant. The relationship between environmental factors and GHGs flux were analyzed by using of correlation analysis. The relationship between CO2, CH4 and N2O fluxes and soil temperature(0-5cm) was not obvious. The soil moisture, aboveground biomass, microbial biomass carbon and invertase were key factors regulating the CO2 fluxes, NO3--N was mainly factor affecting the CH4 absorption flux, and NO3--N and soil urease were the main factors promoting N2O emission flux. Therefore, the CO2 flux was promoted by increasing plant biomass and invertase activity with 6Y warming treatment, and the N2O emission and CH4 absorption flux were improved by increasing the soil urease and NO3--N content with 6Y and 2Y warming treatment.

Key words: Greenhouse gases emission, OTC warming, Alpine meadow, Enzyme activity, Soil nutrients

WANG Xue-xia, GAO Qing-zhu, HASBAGAN Ganjurjav, HU Guo-zheng, LI Wen-han, LUO Wen-rong. Response of Greenhouse Gases Emission Fluxes to Long-term Warming in Alpine Meadow of Northern Tibet[J]. Chinese Journal of Agrometeorology, 2018, 39(03): 152-161.

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