Carbon Storage Of Primary Coniferous Forested Wetlands Ecosystem In Temperate Changbai Mountain Of China

The ecosystem carbon storage(vegetation C storage and soil organic C storage),primary productivity and annual net carbon sequestration of five kinds of natural wetlands(marsh wetland-C,shrubs wetland-G,Larix olgensis-Sphagnurrm magellanicum swamp-LN,Larix olgensis-moss swamp-LX and Larix olgensis-Carex schmiddtii swamp-LT,which distributed along a water environmental gradient from marsh to forest)were measured by using the method of annual growth analyzer,relative growth equation and Multi N/C 3100,HT 1300 Solids Module(Analytik Jena AG,Germany)in temperate Changbai Mountain of China,so as to evaluate the carbon sinks of natural wetlands quantitatively and reveal the influences of environmental gradients on wetland carbon sinks.The results shown that:① The vegetation carbon storage(VCS)of five wetland types ranged from 3.18±1.70 to 112.2±18.30 tC hm-2 which took on an increasing trend along the water environmental gradient.VCS of three coniferous forested wetlands were significantly higher than that of C and G by 12.234.3 times，and VCS of G was 0.6 times higher than that of C,and VCS of LX and LT were significantly higher than that of LN 0.3—0.6 times.② The soil carbon storage(SCS)of five wetland types varied from 296.3±42.24 to 824.5± 50.79 tC hm－2,which shown a decreasing trend along the environmental gradient.SCS of C was significantly higher than that of G and three forested wetland by 30.8%～178.3%,and SCS of G was higher than that of three forested wetland by 38.7%～112.8%，and SCS of LN and LT were higher than that of LX 32.8%～53.4%.③ The ecosystem carbon storage(ECS)of five wetland types varied from 408.42±57.53 to 824.5±50.79 tC hm-2,which also shown a decreasing trend along the environmental gradient.ECS of C was significantly higher than that of G and coniferous forested wetland by 30.2%～102.7%,and ECS of G was significantly higher than that of coniferous forested wetlands by 21.5%～55.6%,and ECS of LN and LT were significantly higher than that of LX by 18.8%～28.0%.④ The net primary productivity of vegetation of 5 types of primeval forest wetland in Changbai mountain was distributed in 5.74 ± 0.08 to 10.98 ± 1.67 t-hm-2 a-1,which showed a stepwise increasing trend along the environmental gradient of transition zone.Larix olgensis-moss swamp-LX and Larix olgensis-Carex schmiddtii swamp-LT vegetation net primary productivity is significantly higher than marsh wetland-C 59.6%～91.3%,shrubs wetland-G 43.3%～71.8%and Larixolgensis-Sphagnum magellanicum swamp-LN 34.5%～61.2%,but between LX and LT,and there were no significant differences between C and G,LN.Annual net carbon sequestration(ANCS)from 2.44±0.03 to 6.36±0.53 tC·hm-2·-a-1 showed a stepwise increasing trend along the environmental gradients.ANCS of three coniferous forested wetlands were significantly higher than C and G 19.4%～111.9%,but only LX and LT reached the average carbon sequestration of China’s terrestrial vegetation and global terrestrial vegetation.Therefor,Marsh wetland and shrubs wetland were much stronger than forested wetlands in long-term carbon sink effect,and both should be paid more attention to in the managing wetland carbon sequestration.