Abstract：Spartina alterniflora, an invasive grass, had rapidly replaced native plant Suaeda salsa since its intentional introduction to the coastal wetlands in Eastern China. Impacts of plant invasion along a Spartina alterniflora chronosequence on soil organic carbon (SOC) dynamics were investigated. The concentrations of SOC in bulk soil increased 70% from 2.89g/kg soil in remnant Suaeda salsa-vegetated soil to 4.90g/kg in 14-year Spartina alterniflora soil, and these values enhanced significantly along its chronosequence. The increase mainly resulted from a high quantity of organic residues incorporated in the soil. Compared with Suaeda salsa-vegetated soil, The SOC concentration increased significantly in coarse fraction (>250mm and 53~250mm) of Spartina alterniflora-vegetated soil, while there was no obvious difference in fine fraction (2~53mm). The δ13C values of SOC for either bulk soil or particle-size fractions were evidently higher in Spartina alterniflora-vegetated soil than in Suaeda salsa-vegetated soil. There was Spartina alterniflora-derived C in all particle-size fraction, however 31%~43% of the Spartina alterniflora-derived C distributed in the coarse fraction (>250mm). It was concluded in this study that Spartina alterniflora invasion significantly promoted SOC accumulation of surface soil in coastal wetland, and new C accumulation profoundly resulted in increasing SOC concentration of the coarse fraction (>250mm).
张耀鸿, 张富存, 周晓冬, 谢晓金, 王小巍, 李强, 雷俊. 互花米草对苏北滨海湿地表土有机碳更新的影响[J]. 中国环境科学, 2011, 31(2): 271-276.
ZHANG Yao-Hong, ZHANG Fu-Cun, ZHOU Xiao-Dong, XIE Xiao-Jin, WANG Xiao-Wei, LI Qiang, LEI Jun. Effects of plant invasion along a Spartina alterniflora chronosequence on organic carbon dynamics in coastal wetland in north Jiangsu. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(2): 271-276.
