Simulating of the response of soil heterotrophic respiration to climate change and nitrogen deposition in alpine meadows

doi:10.11686/cyxb2014297

Abstract

Abstract: Vegetation, soil and climate data in the study area was used to simulate the CO₂ flux from soil heterotrophic respiration in alpine meadows using the CENTURY model. The results showed that the CENTURY model was able to predict seasonal changes in soil heterotrophic respiration which closely matched observed changes. The linear regression equation between observed and simulation values at Fengxiakou and Ganchaitan were y=0.7776x+23.796 (R²=0.6885, n=31) and y=0.9487x-8.6994 (R²=0.6062, n=30), respectively. In the past 46 years (1960-2005), annual average temperature in the study area increased at a rate of 0.35℃/decade. Precipitation has remained with relatively stable. Simulation of soil heterotrophic respiration CO₂ flux in alpine meadows using CENTURY over this period revealed a slowly rising trend (16.5 g C/m²·decade) ranging between 479.2-624.9 g C/(m²·a). Correlation analysis between temperature and rainfall showed that soil heterotrophic respiration CO₂ flux had a significant positive correlation with temperature (r=0.70, P<0.05) but was not correlated with precipitation. Nitrogen application significantly promoted soil heterotrophic respiration CO₂ flux. Medium nitrogen (MN) and high nitrogen (HN) showed highly significant increases compared to the control (zero nitrogen) (P<0.01), but there was no difference between MN and HN. The results suggest that alpine meadow limited by low temperature and nitrogen was sensitive to climate change.

LI Dong, LUO Xu-Peng, CAO Guang-Min, WU Qin, ZHUO Ma-Cuo, LI Hui-Mei, YANG Yong-Mei, PANG Bing-Kun. Simulating of the response of soil heterotrophic respiration to climate change and nitrogen deposition in alpine meadows[J]. Acta Prataculturae Sinica, 2015, 24(7): 1-11.

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