Modeling the effects of changes in air temperature and precipitation on heterotrophic respiration in the central Tibetan Plateau
Tóm tắt
Soil heterotrophic respiration is a major flux of CO2 from terrestrial ecosystems and plays an important role in the feedback between climate and the terrestrial carbon cycle. Numerous studies have shown that the melting of permafrost and frozen soil as a result of global warming is accelerating the release of CO2 from soils by microbial decomposition in cold regions, such as the Tibetan Plateau (TP). The signals of climate change over the TP include warming and wetting. However, it is still not sufficiently understood which domain climate factor is influencing the variability of soil heterotrophic respiration, especially on long time scales. We conducted a control run simulation of soil heterotrophic respiration over 33 years (1980–2012) of the soil heterotrophic respiration using the Community Land Model Version 4.5 at the Beilu River station in central TP, which has a land use type of dry alpine meadow. Four sensitivity simulations of warming and wetting were designed and conducted. The differences between the sensitivity simulations and control run were used to quantify the influence of warming and wetting on changes in heterotrophic respiration. Observations at the Beilu River station were used to evaluate the simulation results. The evaluation results show that, although not perfect, the Community Land Model version 4.5 BGC (CLM4.5) could properly represent seasonal variations in soil temperature, soil water content, and heterotrophic respiration. The model output shows that the seasonal variations in heterotrophic respiration have a significant exponential regression with the air temperature and a significant linear regression with precipitation. However, precipitation dominates the interannual trend of heterotrophic respiration. The annual mean and trends in heterotrophic respiration from the wetting simulation are significantly higher than those in the other simulations. The response of heterotrophic respiration to changes in precipitation is also more pronounced in the wetting simulation. The respiratory quotient (Q10) is positively related to precipitation and negatively related to the surface air temperature. Our results highlight the non-negligible influence of precipitation on heterotrophic respiration in the central TP.
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