中国泥炭地土壤碳库估算：方法、进展与展望
摘要
<p indent="0mm">Peatlands, despite covering only 3% to 4% of the global land area, constitute a significant one-third of the global soil carbon pool and are closely linked to climate change. Understanding the variations in the carbon pool in peatlands, determined by the balance between net primary production (NPP) and organic decomposition, is crucial for comprehending the relationship between the global carbon cycle and global change. However, the response of the peatland carbon pool to climate change remains poorly understood, contributing to a significant source of uncertainty in climate projections. Consequently, the study of peatland soil carbon pools has attracted extensive attention as a research hotspot among scholars. This paper provides a concise summary and evaluation of three estimation methods for peatland carbon pools: The ‘peat volume approach’, the ‘carbon density approach’, and the ‘time history approach’. Each method is analyzed in terms of its advantages, disadvantages, and sources of uncertainty. The ‘peat volume approach’ and the ‘carbon density approach’ subjectively homogenize the thickness and carbon density of peat layers during the calculation process, neglecting the autogenic processes of peatlands, which can lead to potential errors. In contrast, the ‘time history approach’, based on precise chronologies, calculates the net carbon balance of peatlands over time intervals and aggregates them to determine the size of the peatland carbon pool. Through the comparison of different studies on the distribution and area of peatlands in China, it is concluded that the most accurate estimate of China’s peatland area is between 10.07×10<sup>4</sup> km<sup>2</sup> and 13.70 <sc>×10<sup>4</sup> km<sup>2</sup>.</sc> Additionally, several studies on peatland carbon pool estimation in northeastern China and the Zoige Basin indicate average values of 1.56 Gt C (0.14−4.34 Gt C) and 0.75 Gt C (0.39−1.42 Gt C), respectively. Furthermore, an analysis of peatl