| 1 | Organic carbon accumulation capability of two typical tidal wetland soils in Chongming Dongtan,China显示文摘We measured organic carbon input and content of soil in two wetland areas of Chongming Dongtan(Yangtze River Estuary) to evaluate variability in organic carbon accumulation capability in different wetland soils.Observed differences were investigated based on the microbial activity and environmental factors of the soil at the two sites.Results showed that the organic carbon content of wetland soil vegetated with Phragmites australis(site A) was markedly lower than that with P.australis and Spartina alterniflora(site B).Sites differences were due to higher microbial activity at site A,which led to higher soil respiration intensity and greater carbon outputs.This indicated that the capability of organic carbon accumulation of the site B soils was greater than at site A.In addition,petroleum pollution and soil salinity were different in the two wetland soils.After bio-remediation,the soil petroleum pollution at site B was reduced to a similar level of site A.However,the culturable microbial biomass and enzyme activity in the remediated soils were also lower than at site A.These results indicated that greater petroleum pollution at site B did not markedly inhibit soil microbial activity.Therefore,differences in vegetation type and soil salinity were the primary factors responsible for the variation in microbial activity,organic carbon output and organic carbon accumulation capability between site A and site B. | Shiping Zhang Lei Wang Jiajun Hu Wenquan Zhang Xiaohua Fu Yiquan Le Fangming Jin | 2011 | Journal of Environmental Sciences2011，23，1： | 11 |
| 2 | Variability of soil organic carbon reservation capability between coastal salt marsh and riverside freshwater wetland in Chongming Dongtan and its microbial mechanism显示文摘Two representative zones in Chongming Dongtan which faced the Yangtze River and East China Sea respectively were selected to study the variability of soil organic carbon (SOC) reservation capability between coastal wetland and riverside wetland in the Chongming Dongtan wetland as well as its mechanism by analyzing soil characteristics and plant biomass.The results showed the SOC content of riverside wetland was only 48.61% (P=0.000 < 0.05) that of coastal wetland.As the organic matter inputs from plant litter of the coastal wetland and riverside wetland were approximately the same,the higher soil microbial respiration (SMR) of riverside wetland led to its lower SOC reservation capability.In the riverside wetland,the high soil microbial biomass,higher proportion of β-Proteobacteria,which have strong carbon metabolism activity and the existence of some specific aerobic heterotrophic bacteria such as Bacilli and uncultured Lactococcus,were the important reasons for the higher SMR compared to the coastal wetland.There were additional differences in soil physical and chemical characteristics between the coastal wetland and riverside wetlands.Path analysis of predominant bacteria and microbial biomass showed that soil salinity influenced β-Proteobacteria and microbial biomass most negatively among these physical and chemical factors.Therefore the low salinity of the riverside area was suitable for the growth of microorganisms,especially β-Proteobacteria and some specific bacteria,which led to the high SMR and low SOC reservation capability when compared to the coastal area. | Yu Hu Yanli Li Lei Wang Yushu Tang Jinhai Chen Xiaohua Fu Yiquan Le Jihua Wu | 2012 | Journal of Environmental Sciences2012，24，6： | 7 |
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