Ecosystem carbon storage and sink/source of temperate forested wetlands in Xiaoxing’anling, northeast China  

作　　者：Biao Wang Changcheng Mu Huicui Lu Na Li Yan Zhang Li Ma 

机构地区：[1]Center for Ecological Research,Northeast Forestry University,Harbin,150040,People’s Republic of China [2]Faculty of Forestry,Qingdao Agricultural University,Qingdao,266000,People’s Republic of China

出　　处：《Journal of Forestry Research》2022年第3期839-849,共11页林业研究（英文版）

基　　金：This project was supported fi nancially by the National Key Research and Development Program of China(2016YFA0600803);the National Natural Science Foundation of China(31370461).

摘　　要：Wetlands play an important role in the global carbon cycle, but there are still considerable uncertainties in the estimation of wetland carbon storage and a dispute on whether wetlands are carbon sources or carbon sinks. Xiaoxing’anling are one of several concentrated distribution areas of forested wetland in China, but the carbon storage and carbon sink/source of forested wetlands in this area is unclear. We measured the ecosystem carbon storage (vegetation and soil), annual net carbon sequestration of vegetation and annual carbon emissions of soil heterotrophic respiration of five typical forested wetland types (alder swamp, white birch swamp, larch swamp, larch fen, and larch bog) distributed along a moisture gradient in this area in order to reveal the spatial variations of their carbon storage and quantitatively evaluate their position as carbon sink or source according to the net carbon balance of the ecosystems. The results show that the larch fen had high carbon storage (448.8 t ha^(−1)) (6.8% higher than the larch bog and 10.5–30.1% significantly higher than other three wetlands (P < 0.05), the white birch swamp and larch bog were medium carbon storage ecosystems (406.3 and 420.1 t ha^(−1)) (12.4–21.8% significantly higher than the other two types (P < 0.0 5), while the alder swamp and larch swamp were low in carbon storage (345.0 and 361.5 t ha^(−1), respectively). The carbon pools of the five wetlands were dominated by their soil carbon pools (88.5–94.5%), and the vegetation carbon pool was secondary (5.5–11.5%). At the same time, their ecosystem net carbon balances were positive (0.1–0.6 t ha^(−1) a^(−1)) because the annual net carbon sequestration of vegetation (4.0–4.5 t ha^(−1) a^(−1)) were higher than the annual carbon emissions of soil heterotrophic respiration (CO_(2) and CH_(4)) (3.8–4.4 t ha^(−1) a^(−1)) in four wetlands, (the alder swamp being the exception), so all four were carbon sinks while only the alder swamp was a source of carbo

关 键 词：Temperate forested wetlands Ecosystem carbon storage Carbon sink or source Xiaoxing’anling of China 

分 类 号：S718.5[农业科学—林学]