Effects of hydrologic and salinity gradients on soil organic carbon composition in Min River Estuarine wetland
WANG Chun1, LIU Xing-tu1, TONG Chuan2,3, CHEN Xiao-xuan2,3, CHEN You-yang2,3, MOU Xiao-jie1, WAN Si-ang1
1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130120, China;
2. Institute of Geography, Fujian Normal University, Fuzhou 350007, China;
3. Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China
In order to reveal the effects of hydrologic and salinity gradients on soil organic carbon composition in estuarine wetlands, the contents of soil organic carbon fractions along the hydrologic gradient within a freshwater Cyperus malaccensis marsh and a brackish C. malaccensis marshes in the Min River Estuary were measured. Soil microibial biomass carbon (MBC) contents raised with increasing flooding frequency both in brackish-water marsh (67.8%) and freshwater marsh (38.8%), respectively. For both high tidal flat and low tidal flat, the MBC content in brackish-marsh was lower than that in freshwater marsh, and declining ranges were 52.9% and 43.1% high tidal flat via low tidal flat, respectively. Soil dissolved organic carbon (DOC) content in brackish marsh was higher than that in freshwater marsh, and increasing range were 56.7% and 105.6% high tidal flat via low tidal flat. Soil EOC content declined with increasing flooding frequency, and declining ranges were 18.0% and 50.1% brackish marsh via freshwater marsh, respectively. Soil EOC content in brackish marsh was higher than that in freshwater marsh, increased by 20.2% in high tidal flat and 97.4% in low tidal flat, respectively. The percentages of soil microbial entropy, DOC and EOC in SOC were 0.42%~1.76%, 0.39%~0.85% and 20.14%~36.49%, respectively. Microbial entropy declined with increasing flooding frequency, while the proportions of soil DOC and EOC in SOC increased with increasing flooding frequency. Compared with the varied flooding environment, soil TN content and conductivity had a greater contribution on the SOC contents and its active components. Soil DOC and EOC contents were positively correlated with SOC content, and soil MBC content was negatively correlated with SOC, EOC and DOC contents, which implied substrate availability and soil MBC turnover rate exerted important impacts on controlling soil microbial activity and soil carbon pool accumulation in estuarine tidal marsh. Soil microbes increased with increasing flooding frequency, but they had a certain adaptation mechanism to the flooding environment. Elevated salinity increased soil DOC and EOC contents, but decreased soil MBC content. Soil nitrogen content and salinity which were important restrictive parameters demonstrated obviously effects on controlling soil carbon pool evolution in the tidal marsh ecosystem of the Min River estuary.
王纯, 刘兴土, 仝川, 陈晓旋, 陈优阳, 牟晓杰, 万斯昂. 水盐梯度对闽江河口湿地土壤有机碳组分的影响[J]. 中国环境科学, 2017, 37(10): 3919-3928.
WANG Chun, LIU Xing-tu, TONG Chuan, CHEN Xiao-xuan, CHEN You-yang, MOU Xiao-jie, WAN Si-ang. Effects of hydrologic and salinity gradients on soil organic carbon composition in Min River Estuarine wetland. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3919-3928.
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