title: Variability of soil organic carbon reservation capability between coastal salt marsh and riverside freshwater wetland in Chongming Dongtan and its microbial mechanism.
abstract: 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 beta-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 beta-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 beta-Proteobacteria and some specific bacteria, which led to the high SMR and low SOC reservation capability when compared to the coastal area.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. huyu88215@126.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Hu
authors.forename: Yanli
authors.initials: Y
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Yushu
authors.initials: Y
authors.lastname: Tang
authors.forename: Jinhai
authors.initials: J
authors.lastname: Chen
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Fu
authors.forename: Yiquan
authors.initials: Y
authors.lastname: Le
authors.forename: Jihua
authors.initials: J
authors.lastname: Wu
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics; D002244:Carbon / Q000032:analysis*; D002681:China; D004269:DNA, Bacterial / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D005618:Fresh Water; D010802:Phylogeny; D045483:Rivers; D054712:Salinity; D012623:Seawater; D017422:Sequence Analysis, DNA; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D053833:Wetlands
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012987:Soil; D002244:Carbon