土壤有机碳储量估算的影响因素和不确定性

土壤作为陆地生态系统最大的碳库和碳循环过程的关键环节，其源、汇的变化直接影响全球碳平衡，因此，土壤有机碳储量估算成为生态领域的重要研究内容之一。通过比较不同研究者在不同研究尺度上报道的有机碳储量的研究结果，发现这些研究结果较不一致。分析认为导致土壤有机碳储量评估结果存在较大差异的原因，主要是来自于采样过程中人类干扰以及气候变化等环境要素的波动，特别是研究者所采取的不同估算方法和背景资料。从环境要素（外因）和估算方法（内因）两个角度出发，提出了土壤有机碳储量的研究意义，阐述了造成土壤有机碳储量估算的不确定性和目前研究中存在的问题，并在此基础上，对其未来研究方向和重点进行了展望。

Impact Factors and Uncertainties of the Estimation on Soil Organic Carbon Storage

Soil is regarded as the largest carbon pools and the key linkage in the process of the carbon cycle in terrestrial ecosystem. The global carbon balance is directly affected by the change of source or sink of soil carbon. Hence the estimation on soil organic carbon storage becomes one of the most important content in the ecological field. We found that the difference was existed among the reported results of the soil organic carbon storage from the different researchers or research scales. This difference was mainly resulted from human disturbance and the fluctuation of environmental elements （e.g. climate change） in the sampling process, in particular, the various estimating methods and background information adopted by researchers. The significance of the study on the soil organic carbon storage was raised firstly. Then the research advances and the shortcomings in the present about the uncertainties of the estimation on soil organic carbon storage were reviewed from the aspects of environmental factors （external reason） and estimating methods （internal reason）. Finally, on the basis of our thorough review, the priority areas in the future about the uncertainties on the estimation of soil organic carbon storage were suggested in this paper.