| The ecosystem carbon storage(vegetation C storage and soil organic C storage),carbon sequestration and net primary productivity of four kinds of natural wetlands(marsh wetland,shrubs wetland,Alnus sibirica var.hirsuta wetland and Betula platyphylla wetland,which distributed along a water environmental gradients from marsh to forest)were studied 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 Mountains of China,so as to evaluate the carbon storage and carbon sequestration ability of natural wetlands quantitatively and reveal the regularity of spatial variation in landscape scale.The results showed that:(1)the vegetation carbon reserves of 4 types of natural swamps in Changbai Mountain(3.02 +0.22～54.04 + 23.76 T/hm-2)showed an increasing trend in the water environmental gradient along the swamps to the forest.Although the carbon reserves in the shrub and herbaceous layers decreased along the environmental gradient of the transitional zone,the carbon reserves of the tree layer were far higher than those of the other levels,so the change of vegetation carbon reserves was less.There are great spatial heterogeneity in the transition zone,and the main difference is litter layer.(2)the soil carbon reserves of 4 types of natural swamps in Changbai Mountain(459.67 +7.11～824.5 + 50.79 T/hm-2)showed a decreasing trend of water environmental gradient along the swamps to forest.The difference between 2 forest swamps was not significant,but there was a significant difference between them.The carbon reserves of the 2 natural swamps were increasing with the increase of soil depth,and the carbon reserves of Mao Chiyang swamp soil increased by 25.23thm-2.The carbon reserves of the Betula swamp soil increased by 13.82thm-2.(3)there are significant differences in ecosystem carbon storage of 4 typical swamp types in Changbai Mountain.The carbon storage of the swamp types in the transitional gradient is 513.28 +6.44～827.68 + 50.96t/hm-2,showing a decreasing trend.The 4 typical types of natural swamps are dominated by soil carbon reserves,while forest swamps and bushes swamps and shrub swamps have different carbon sequestration functions.That is,grass swamps and shrub swamps are mainly carbon storage in the form of peat,while forest swamps are formed to form peat and accumulate vegetation biomass.There are two ways to store carbon.The 4 typical natural swamp wetlands in temperate Changbai Mountain are more carbon sink than those in northern forest,but they belong to medium carbon sink in northern peat wetlands.(4)the net primary productivity and carbon sequestration capacity of 4 natural swamp types in Changbai Mountain showed a stepwise increasing trend along the gradient of wetland transition zone.The net primary productivity and annual net carbon fixation of grass swamps were determined only by the layer of herbaceous layer.The net primary productivity and annual net carbon fixation of shrub swamp were composed of shrub layer and herb layer,and the two were 13.93%and 86.07%respectively.The net primary productivity and annual net carbon sequestration of Mao Chiyang swamp and birch swamp consist of three layers(arbor layer,shrub layer and herb layer).The net primary productivity of each type of vegetation was 5.74 + 0.08～15.9 + 1.35 t hm-2/A-1,and the annual net carbon fixation of vegetation was 2.44 + 0.03～6.36 + 0.53 tC hm-2 A-1.The two broad-leaved forest swamp in Changbai Mountain is a high carbon sequestration wetland type. |
PDF Full Text Request