Leaching of dissolved organic matter from seagrass leaf litter and its biogeochemical implications
文献类型：期刊论文
| 作者 | Trevathan-Tackett, Stacey M.; Liu Songlin2; Jiang Zhijian; Zhou Chenyuan2; Wu Yunchao2; Arbi, Iman2; Zhang Jingping; Huang Xiaoping2 |
| 刊名 | ACTA OCEANOLOGICA SINICA
 |
| 出版日期 | 2018 |
| 卷号 | 37期号:8页码:84 |
| 关键词 | dissolved organic matter Thalassia hemprichii Enhalus acoroides leaf litter leaching |
| ISSN号 | 0253-505X |
| 英文摘要 | Dissolved organic matter (DOM) represents a significant source of nutrients that supports the microbial-based food web in seagrass ecosystems. However, there is little information on how the various fractions of DOM from seagrass leaves contributed to the coastal biogeochemical cycles. To address this gap, we carried out a 30-day laboratory chamber experiment on tropical seagrasses Thalassia hemprichii and Enhalus acoroides. After 30 days of incubation, on average 22% carbon (C), 70% nitrogen (N) and 38% phosphorus (P) of these two species of seagrass leaf litter was released. The average leached dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) of these two species of seagrass leaf litter accounted for 55%, 95% and 65% of the total C, N and P lost, respectively. In the absence of microbes, about 75% of the total amount of DOC, monosaccharides (MCHO), DON and DOP were quickly released via leaching from both seagrass species in the first 9 days. Subsequently, little DOM was released during the remainder of the experiment. The leaching rates of DOC, DON and DOP were approximately 110, 40 and 0.70 mu mol/(g.d). Leaching rates of DOM were attributed to the nonstructural carbohydrates and other labile organic matter within the seagrass leaf. Thalassia hemprichii leached more DOC, DOP and MCHO than E. acoroides. In contrast, E. acoroides leached higher concentrations of DON than T hemprichii, with the overall leachate also having a higher DON: DOP ratio. These results indicate that there is an overall higher amount of DOM leachate from T. hemprichii than that of E. acoroides that is available to the seagrass ecosystem. According to the logarithmic model for DOM release and the in situ leaf litter production (the Xincun Bay, South China Sea), the seagrass leaf litter of these two seagrass species could release approximately 4x10(3) mol/d DOC, 1.4x10(3) mol/d DON and 25 mol/d DOP into the seawater. In addition to providing readily available nutrients for the microbial food web, the remaining particulate organic matter (POM) from the litter would also enter microbial remineralization processes. What is not remineralized from either DOM or POM fractions has potential to contribute to the permanent carbon stocks. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17652]  |
| 专题 | 南海海洋研究所_中科院海洋生物资源可持续利用重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China 3.Trevathan-Tackett, Stacey M.] Deakin Univ, Ctr Integrat Ecol, Sch Life & Environm Sci, Burwood, Vic 3125, Australia |
| 推荐引用方式 GB/T 7714 | Trevathan-Tackett, Stacey M.,Liu Songlin,Jiang Zhijian,et al. Leaching of dissolved organic matter from seagrass leaf litter and its biogeochemical implications[J]. ACTA OCEANOLOGICA SINICA,2018,37(8):84, 90. |
| APA | Trevathan-Tackett, Stacey M..,Liu Songlin.,Jiang Zhijian.,Zhou Chenyuan.,Wu Yunchao.,...&Huang Xiaoping.(2018).Leaching of dissolved organic matter from seagrass leaf litter and its biogeochemical implications.ACTA OCEANOLOGICA SINICA,37(8),84. |
| MLA | Trevathan-Tackett, Stacey M.,et al."Leaching of dissolved organic matter from seagrass leaf litter and its biogeochemical implications".ACTA OCEANOLOGICA SINICA 37.8(2018):84. |
入库方式： OAI收割
来源：南海海洋研究所
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