| Quanzhou Bay estuarine wetland is a typical representative of the subtropical estuarine wetlands, Aegiceras corniculatum in the natural distribution is bounded on the northwest coast of the Pacific ocean. In recent years, with the rapid development of economic construction, continuous expansion of Quanzhou city, many construction projects through the adjacent city of Quanzhou Bay estuarine wetlands, which are subject to certain threats to biodiversity. A satellite remote sensing technology and research methods were used to investigate a combination of standards, studied biomass, carbon content, carbon density and carbon storage distribution of Quanzhou Bay estuarine wetland’s major plant communities for the correct evaluating of the wetland’s carbon cycle characteristics and carbon sink to provide basic data. The main conclusions are as follows:(1)Distribution of carbon density and biomass of Quanzhou Bay estuarine wetland’s major plant communities were similar, The distributions were decreased by the order of K.obovata community > K.obovata-Aegiceras community > Aegiceras community > Spartina alterniflora community, All communities of above ground part biomass and carbon density were greater than underground part; According to the different plant parts division, biomass and carbon density of K.obovata community and K.obovata-Aegiceras community were decreased by the order of trunk>branch>leaf>taproot >lateral root, biomass and carbon density of Aegiceras community were trunk> branch> taproot > leaf >lateral root.(2)Carbon content of plant community was decreased by the order of Aegiceras community(42.33±2.22%)>K.obovata-Aegiceras community(42.27±3.23%)>K.obovata community(42.04±3.27%)>Spartina alterniflora community(39.14±1.74%);According to the different plant parts division, K.obovata community was decreased by the order of trunk > branch > leaf > taproot > lateral root, Aegiceras community was taproot > trunk > branch > leaf > lateral root, K.obovata-Aegiceras community was trunk > leaf > branch > taproot > lateral root, Spartina alterniflora community was the above ground part > underground part.(3)Soil carbon content in 0-30 cm soil layer:Spartina alterniflora community the highest, for 1.20 ± 0.34%, and K.obovata-Aegiceras community, Aegiceras community, nude beach, K.obovata community was 116.50%, 122.45%, 123.71%, 125.00% respectively; According to the low, middle, high tide level division, K.obovata community was decreased by the order of low tide level > middle tide level > high tide level; Aegiceras community and K.obovata-Aegiceras community were low tide level > high tide level > middle tide level; Spartina alterniflora community was high tide level >low tide level >middle tide level; nude beach was high tide level > middle tide level > low tide level.(4)Soil carbon density in 0-30 cm soil layer:Nude beach the most, for 28.31t/hm2, and Spartina alterniflora community, K.obovata-Aegiceras community, Aegiceras community, K.obovata community was 102.65%、114.11%、126.78%、133.54% respectively; According to the low, middle, high tide level division, Mangrove communities were decreased by the order of low tide level > high tide level > middle tide level; Spartina alterniflora community and Nude beach were high tide level > middle tide level > low tide level.(5)The total area of wetland ecosystem in the study area was 6846.71hm2, its carbon storage was about 202.52 kt. Among them, soil carbon storage in 0-30 cm soil layer was 191.61 kt, accounted for 94.61%, plant carbon storage of the main plant communities was 10.91 kt, accounted for 5.39%. Carbon storage in different ecosystems influenced by the area, the order of estuarine waters > intertidal nude beach > Mangrove community > Spartina alterniflora community > aquaculture ponds, accounted for 55.28%, 29.49%, 7.76%, 6.65% and 0.82% of the total carbon storage. |
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