人工林土壤有机碳固存及其对生态系统碳汇的贡献的决定因素。
Determinants of soil organic carbon sequestration and its contribution to ecosystem carbon sinks of planted forests.
机构信息
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
University of Chinese Academy of Sciences, Beijing, China.
出版信息
Glob Chang Biol. 2020 May;26(5):3163-3173. doi: 10.1111/gcb.15036. Epub 2020 Mar 23.
The area of forest established through afforestation/reforestation has been increasing on a global scale, which is particularly important as these planted forests attenuate climate change by sequestering carbon. However, the determinants of soil organic carbon (SOC) sequestration and their contribution to the ecosystem carbon sink of planted forests remain uncertain. By using globally distributed data extracted from 154 peer-reviewed publications and a total of 355 sampling points, we investigated above-ground biomass carbon (ABC) sequestration and SOC sequestration across three different climatic zones (tropical, warm temperate, and cold temperate) through correlation analysis, regression models, and structural equation modeling (SEM). We found that the proportion of SOC sequestration in the ecosystem C sequestration averaged 14.1% globally, being the highest (27.0%) in the warm temperate and the lowest (10.7%) in the tropical climatic zones. The proportion was mainly affected by latitude. The sink rate of ABC (R ) in tropical climates (2.48 Mg C ha year ) and the sink rate of SOC (R ) in warm temperate climates (0.96 Mg C ha year ) were higher than other climatic zones. The main determinants of R were the number of frost-free days, latitude, mean annual precipitation (MAP), and SOC density (SOCD) at the initial observation; however, these variables depended on the climatic zone. According to the SEM, frost-free period, mean annual temperature (MAT) and MAP are the dominant driving factors affecting R in Chinese plantations. MAT has a positive effect on R , and global warming may increase R of temperate plantations in China. Our findings highlight the determinants of SOC sequestration and quantitatively reveal the substantial global contribution of SOC sequestration to ecosystem carbon sink provided by planted forests. Our results help managers identify and control key factors to increase carbon sequestration in forest ecosystems.
全球范围内，通过造林/再造林建立的森林面积一直在增加，这一点尤为重要，因为这些人工林通过固碳来减缓气候变化。然而，土壤有机碳（SOC）固存的决定因素及其对人工林生态系统碳汇的贡献仍不确定。本研究通过使用从 154 篇同行评议出版物中提取的全球分布数据，以及总共 355 个采样点，通过相关分析、回归模型和结构方程模型（SEM），研究了三个不同气候带（热带、暖温带和寒温带）的地上生物量碳（ABC）固存和 SOC 固存。结果表明，全球生态系统碳固存中 SOC 固存的比例平均为 14.1%，在暖温带最高（27.0%），在热带最低（10.7%）。这一比例主要受纬度影响。热带气候中 ABC 的汇速率（R ）（2.48 Mg C ha 年）和暖温带气候中 SOC 的汇速率（R ）（0.96 Mg C ha 年）高于其他气候带。R 的主要决定因素是初始观测时无冻期天数、纬度、年平均降水量（MAP）和 SOC 密度（SOCD）；然而，这些变量取决于气候带。根据 SEM，无冻期、年平均温度（MAT）和 MAP 是影响中国人工林 R 的主要驱动因素。MAT 对 R 有积极影响，全球变暖可能会增加中国温带人工林的 R 。本研究结果强调了 SOC 固存的决定因素，并定量揭示了人工林 SOC 固存对生态系统碳汇的巨大全球贡献。本研究结果有助于管理者确定和控制关键因素，以增加森林生态系统的碳固存。
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