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Non-growth season’s greenhouse gases emission and its yearly contribution from alpine meadow on Tibetan Plateau of China.

WANG Guang-shuai1,2, YANG Xiao-xia1,2, REN Fei1,2, ZHANG Zhen-hua1, HE Jin-sheng1**   

  1. (1The Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China; 2 University of Chinese Academy of Sciences, Beijing 10049, China)
  • Online:2013-08-10 Published:2013-08-10

Abstract: Alpine meadow is widely distributed on the Tibetan Plateau. The studies on the greenhouse gases (GHGs) flux in the alpine meadow are mostly carried out during growing season, but scarcely quantified during nongrowing season. By using static chamber technique and gas chromatography, this paper studied the characteristics of CO2, CH4, and N2O fluxes in this alpine meadow during nongrowing season. The mean fluxes of CO2, CH4, and N2O were 89.33 mg·m-2·h-1, -11.35 μg·m-2·h-1, and 8.02 μg·m-2·h-1, and the cumulative fluxes were 280.01 g·m-2, -124.74 mg·m-2, and 39.51 mg·m-2, respectively. Therefore, this alpine meadow was performed as the sources of CO2 and N2O and the sink of CH4 during nongrowing season. The cumulative CH4, CO2 and N2O fluxes during nongrowing season contributed 13.33%, 53.47% and 62.67% of the total in a whole year. During freezethawing period (April, 2012), cumulative CH4 flux was smaller, only contributing 4.5% of the total during non-growing season, whereas the cumulative CO2 and N2O fluxes were larger, contributing 25.8% and 20.8%, respectively. The CO2 flux during nongrowing season had significant positive correlations with air temperature, soil temperature at the depths of 5 cm and 10 cm, and soil moisture at depth 5 cm. Our results showed that though the cumulative CH4 flux during freezethawing period only occupied a smaller part of that during nongrowing season, the cumulative CH4 and N2O fluxes during nongrowing season contributed more than 50% of the total in a whole year, which should not be neglected in the estimation of the GHGs fluxes and their global warming potential in the alpine meadow on the Tibetan Plateau.

Key words: temperature sensibility coefficient (Q10), light response, temperature response, environmental factors., net CO2 ecosystem exchange (NEE), biotic factors