Different responses of soil respiration to climate change in permafrost and non‐permafrost regions of the Tibetan plateau from 1979 to 2018

Abstract

AbstractSoil respiration is the primary efflux of carbon dioxide (CO2) in the terrestrial ecosystem. The soil of alpine grassland on the Tibetan Plateau (TP) is rich in soil organic matter, which may release more carbon dioxide as the climate warming. However, due to the limited observations here, there are still deficiencies in understanding the response of soil respiration to climate change, especially the difference between permafrost and non‐permafrost regions. In this paper, we investigate the climatology and trend of soil respiration on the TP from 1979 to 2018, using the Community Land Model version 4.5 (CLM4.5) forced by a suite of high‐resolution atmosphere dataset. Evaluation results show that the land surface model could properly reproduce permafrost extent, and capture the spatial pattern of soil temperature, soil moisture, leaf area index (LAI), and soil respiration. For the whole TP, we find that the spatial pattern for both climatology and trends of soil respiration are correlated with LAI significantly and positively. In addition to the effects of vegetation, precipitation was more correlated with soil respiration than temperature among climatic variables in recent decades. For permafrost and non‐permafrost regions, climate change affects soil respiration in different ways. In permafrost areas, precipitation plays a more important role than temperature. Conversely, in non‐permafrost regions, temperature has a more pronounced effect on soil respiration. The results of this study provide valuable information for predicting greenhouse gas emissions and understanding the carbon cycle on the TP.