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Contrasting root length, nutrient content and carbon sequestration of seagrass growing in offshore carbonate and onshore terrigenous sediments in the South China Sea
Jiang, Zhijian; Zhao, Chunyu1; Yu, Shuo2; Liu, Songlin; Cui, Lijun1; Wu, Yunchao; Fang, Yang1; Huang, Xiaoping1
2019
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume662Pages:151
AbstractDue to distinct human disturbances and sediment type, seagrasses growing in offshore carbonate and onshore terrigenous sediments may show contrasting characteristics. A comparison of seagrass morphology, nutrient content and sediment carbon pools was taken for seagrass beds inhabiting offshore carbonate sediments in Xuande Atoll and onshore terrigenous sediments in Hainan Island, South China Sea. Lower nitrogen (N) content was observed in the aboveground (1.1%-2.8%) and belowground (0.4%-1.5%) tissue of seagrasses in Xuande Atoll than in the same species (aboveground: 2.7%-3.6%; belowground: 1.2%-2.8%) in Hainan Island. Greater depletion of leaf delta N-15 of Thalassia hemprichii (T. hemprichii) and Halodule pinifolia (H. pinifolia) in Xuande Atoll indicated nitrogen fixation might be the major source of nitrogen in oligotrophic reef environments. The root lengths of the seagrass species in Xuande Atoll were longer than the same species in Hainan Island. Sediment inorganic carbon (SIC) was considerably higher than sediment organic carbon (SOC) in the carbonate sediment, while the opposite trend was found in the terrigenous sediments. The SOC stock in the carbonate and terrigenous sediments was 2.41 +/- 0.78 Mg C ha(-1) and 2.20 +/- 0.34Mg C ha(-1) in the top 5 cm, respectively, while the corresponding SIC was 84.38 +/- 21.65 Mg C ha(-1) and 1.27 +/- 0.51 Mg C ha(-1), respectively. The average CO2 (net sequestered) in the carbonate sediment in Xuande Atoll and the terrigenous sediment in Hainan Island were -48.22 +/- -12.21 Mg C ha(-1) and 1.44 +/- 0.03 Mg C ha(-1), respectively. This suggested seagrass sediment was a source of CO2 during sediment production in the carbonate sediment but a sink of CO2 in the terrigenous sediment. Thus, the N concentration in seagrass leaf, root length, sediment carbon composition and pools were contrasted between offshore carbonate sediments and onshore terrigenous sediments. (C) 2019 Elsevier B.V. All rights reserved.
DepartmentLMB
KeywordSeagrass Carbonate sediment Terrigenous sediment Morphology Nutrient Carbon sequestration
DOI10.1016/j.scitotenv.2019.01.175
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17859
Collection中科院海洋生物资源可持续利用重点实验室
Affiliation1.South China Sea Inst Oceanol, CAS Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.State Ocean Adm, Fouth Inst Oceanog, Beihai 53600, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Zhijian,Zhao, Chunyu,Yu, Shuo,et al. Contrasting root length, nutrient content and carbon sequestration of seagrass growing in offshore carbonate and onshore terrigenous sediments in the South China Sea[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,662:151, 159.
APA Jiang, Zhijian.,Zhao, Chunyu.,Yu, Shuo.,Liu, Songlin.,Cui, Lijun.,...&Huang, Xiaoping.(2019).Contrasting root length, nutrient content and carbon sequestration of seagrass growing in offshore carbonate and onshore terrigenous sediments in the South China Sea.SCIENCE OF THE TOTAL ENVIRONMENT,662,151.
MLA Jiang, Zhijian,et al."Contrasting root length, nutrient content and carbon sequestration of seagrass growing in offshore carbonate and onshore terrigenous sediments in the South China Sea".SCIENCE OF THE TOTAL ENVIRONMENT 662(2019):151.
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