ObjectiveThis paper dataly analyzed the long-term carbon sequestration, carbon storage and carbon sequestration capacity of several swamp types. The aim is to reveal the spatial variability of several types of swamp.
MethodUsing the Ring analyzer and the relative growth equation method and the carbon/Nitrogen Analyzer Determination method, the annual net carbon sequestration and net primary productivity of vegetation in the ecosystem were studied, and the carbon reserves (soil and vegetation) of 4 natural swamp ecosystems with gradient sequence distribution of environmental gradients in the temperate Changbai Mountain from the wetland transition zone were studied, and the 4 types of marsh included: birch swamp, Mauchian swamp, thickets of swamp, and grassy swamp. The distribution pattern of the water environment gradients along the transitional zone of these types of swamp was analyzed.
Result (1) The vegetation carbon storage(VCS) of four wetland types varied from (3.02±0.17) t/ha to (57.04±5.35) t/ha, which took on an increasing trend along the water environmental gradient. VCS of two broadleaved forested wetlands was significantly higher than that of marsh and shrub wetland by 15.9－16.0 and 9.3－9.4 times (P < 0.05), and VCS of shrub wetland was 0.63 times higher thanmarsh wetland(P>0.05). (2)The soil carbon storage(SCS) of four wetland types varied from (459.67± 7.11) t/ha to (824.5±50.79) t/ha, which showed a decreasing trend along the environmental gradient. SCS of marsh wetland was significantly higher than shrub wetland and two forested wetland by 30.8%－79.4% (P < 0.05), and SCS of shrub wetland was higher than two forested wetland by 20.4%－37.1% (P < 0.05). (3) The ecosystem carbon storage (ECS) of four wetland types varied from (516.71±6.44) t/ha to (827.52±50.96) t/ha, which also showed a decreasing trend along the environmental gradient. ECS of marsh wetland was significantly higher than shrub wetland and forested wetland by 30.2%－61.3% (P < 0.05), and ECS of shrub wetland was significantly higher than birch wetland by 23.8% (P < 0.05) and Alnus sibirica wetland by 10.0%(P>0.05). (4)The vegetation net carbon sequestration (VNCS) of four wetland types varied from (2.44±0.03) t/(ha·a) to (6.36±0.53) t/(ha·a), which showed a gradual upward trend along the environmental gradient. VNCS of two kinds of forested wetlands was significantly higher than marsh and shrub wetland by 1.4-1.6 and 1.3-1.4 times (P < 0.05), respectively, and also was higher than the average of Chinese vegetation VNCS and global vegetation VNCS by 20%-30% and 45%-55%.
ConclusionIt shows that the carbon sequestration in forest marsh is much higher than that of terrestrial vegetation. Therefore, two broadleaved forested wetlands in temperate Changbai Mountain should belong to the high-carbon-fixing wetland type.
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