期刊
MARINE POLLUTION BULLETIN
卷 110, 期 1, 页码 274-280出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.06.054
关键词
Seagrass bed; Sediment organic carbon; Source; Composition; Nutrient; Microbial biomass carbon
资金
- National Basic Research Program of China [2015CB452905, 2015CB452902]
- National Natural Science Foundation of China [41306108, 41406128]
- Natural Science Fund of Guangdong [2014 A030313734, 2014 A030313716]
- National Specialized Project of Science and Technology [2015FY110600]
To assess the effect of nutrient enrichment on the source and composition of sediment organic carbon (SOC) beneath Thalassia hemprichii and Enhalus acoroides in tropical seagrass beds, Xincun Bay, South China Sea, intertidal sediment, primary producers, and seawater samples were collected. No significant differences on sediment delta C-13, SOC, and microbial biomass carbon (MBC) were observed between T. hemprichii and E. acoroides. SOC was mainly of autochthonous origin, while the contribution of seagrass to SOC was less than that of suspended particulate organic matter, macroalgae and epiphytes. High nutrient concentrations contributed substantially to SOC of seagrass, macroalgae, and epiphytes. The SOC, MBC, and MBC/SOC ratio in the nearest transect to fish farming were the highest This suggested a more labile composition of SOC and shorter turnover times in higher nutrient regions. Therefore, the research indicates that nutrient enrichment could enhance plant-derived contributions to SOC and microbial use efficiency. (C) 2016 Elsevier Ltd. All rights reserved.
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