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海岸带盐沼植被的高生产力对湿地土壤碳库的形成具有重要意义.本文研究了长江口崇明东滩湿地3种主要盐沼植物(芦苇、互花米草和海三棱草)群落生物量差异、土壤碳储量时空动态和垂向分布特征.结果表明:湿地盐沼植被总生物量表现为互花米草群落(5750.7 g·m-2)>芦苇群落(4655.1 g·m-2)>海三棱草群落(812.7 g·m-2),且地上生物量在夏、秋季最高,地下生物量在冬季最高.湿地土壤碳储量(0~50 cm)在春季最低,随后逐渐增加,至冬季达到最大值.土壤碳储量年增量从高潮滩向低潮滩递减,表现为芦苇群落(711.8 g·m-2)>互花米草群落(646.2 g·m-2)>海三棱草群落(185.3 g·m-2)>光滩(65.6 g·m-2).光滩土壤碳储量在25~30 cm处最高,海三棱草、互花米草和芦苇群落土壤碳储量分别在10~15、30~35和30~40 cm处达到最大值,且不同群落土壤碳储量与植被地下生物量具有显著的线性关系.
The high productivity of coastal salt marsh vegetation is of great importance to the formation of soil carbon pool in wetland.This paper studied the community biology of three main salt marsh plants (Phragmites communis and Scripotrys palms) in Chongming Dongtan wetland of the Yangtze River estuary The results showed that the total biomass of the wetland salinities showed Spartina alterniflora community (5750.7 g · m-2)> Phragmites communis (4655.1 g · m-2) (812.7 g · m-2), and the aboveground biomass was the highest in summer and autumn, while the biomass of underground was the highest in winter.The soil carbon storage (0-50 cm) in wetland was the lowest in spring and then gradually increased , And reached the maximum in winter. The annual increment of soil carbon storage decreased from high tide beach to low tide beach, showing as follows: Reed community (711.8 g · m -2)> Spartina alterniflora community (646.2 g · m -2) (185.3 g · m-2)> light beach (65.6 g · m-2) .The soil carbon storage of light beach was the highest at 25 ~ 30 cm, while that of S. trifoliata, Spartina alterniflora and Phragmites communis Soil carbon storage reached its maximum at 10-15, 30-35 and 30-40 cm respectively, and there was a significant linear relationship between soil carbon storage and vegetation biomass in different communities.