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Soil organic carbon stabilization mechanisms in a subtropical mangrove and salt marsh ecosystems
- Source :
- Science of The Total Environment. 673:502-510
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Mangrove and salt marsh ecosystems are one of the most productive ecosystems in terrestrial ecosystems, playing an important role in global carbon (C) cycling. The anaerobic condition in coastal wetland usually impedes the decomposition of soil organic carbon (SOC). However, the intrinsic stabilization mechanisms of SOC other than environmental factors are poorly understood in coastal wetland. In this paper, we investigated the relative contribution of mineral association and chemical compounds in maintaining the stabilization of SOC in the mangrove/salt marsh ecotone, and how the microbial community is involved in the stabilization. From NMR spectroscopy, we found that the SOC molecular structure of Spartina. alterniflora soils is simpler than that in mangrove forest, indicating an increased SOC decomposition with invasion of S. alterniflora. On the contrary, the molecular structure of SOC in mangrove forest was dominated by recalcitrant aromatic C. Meanwhile, the larger fractions of silt/clay content in S. alterniflora and the transitional community were corresponding to higher percentage of mineral organic carbon (MOC), which suggest that the SOC in S. alterniflora vegetated soil was mainly protected by the mineral association. The transitional community contained highest MOC content probably due to both physical protection of mineral association and recalcitrant C input from adjacent mangroves. We also found that the fraction of SOC and its chemical structure of functional groups were associated with microbial communities. This study revealed the occurrence of different SOC stabilization mechanisms between mangroves and salt marshes. The knowledge gained may help to make predictions about future SOC dynamics as the different stabilization processes may response to climate change or human activities differently.
- Subjects :
- inorganic chemicals
Environmental Engineering
010504 meteorology & atmospheric sciences
Climate Change
Wetland
010501 environmental sciences
Spartina alterniflora
01 natural sciences
Carbon Cycle
Soil
otorhinolaryngologic diseases
Environmental Chemistry
Ecosystem
Waste Management and Disposal
0105 earth and related environmental sciences
Spartina
geography
geography.geographical_feature_category
biology
Ecology
Microbiota
Soil carbon
biology.organism_classification
Pollution
Carbon
Wetlands
Salt marsh
Environmental science
Terrestrial ecosystem
sense organs
Mangrove
Introduced Species
Environmental Monitoring
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 673
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....753fb0df9d89a771688629c39525f6ac