长棘海星暴发对珊瑚礁区沉积物营养盐动力学的影响研究

夏荣林; 宁志铭; 余克服; 方草; 黄学勇; 韦芬

doi:10.12284/hyxb2022128

长棘海星暴发对珊瑚礁区沉积物营养盐动力学的影响研究

doi: 10.12284/hyxb2022128

夏荣林^1,,
宁志铭^{1, 2, 3, ,},
余克服^{1, 2, 3},
方草¹,
黄学勇^{1, 2, 3},
韦芬^{1, 2, 3}

1.
广西大学海洋学院，广西南宁 530004
2.
广西大学珊瑚礁研究中心，广西南宁 530004
3.
广西南海珊瑚礁研究重点实验室，广西南宁 530004

基金项目: 三沙海洋生态环境项目；国家自然科学基金（42090041，42030502）。

详细信息

作者简介:
夏荣林（1999-），男，广西壮族自治区浦北县人，从事营养盐循环方面研究。E-mail：1670588549@qq.com

通讯作者:
宁志铭，男，博士，从事海洋生物地球化学方面研究。E-mail：zmning@gxu.edu.cn

中图分类号: P734.4⁺4；P714⁺.5
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出版历程
- 收稿日期: 2021-10-27
- 修回日期: 2022-02-25
- 网络出版日期: 2022-05-05
- 刊出日期: 2022-08-15

Study on the impacts of crown-of-thorns starfish on nutrient dynamics in the coral reef sediments

Xia Ronglin^1
,,
Ning Zhiming^{1, 2, 3
, ,},
Yu Kefu^{1, 2, 3},
Fang Cao¹,
Huang Xueyong^{1, 2, 3},
Wei Fen^{1, 2, 3}

1.
School of Marine Sciences, Guangxi University, Nanning 530004, China
2.
Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
3.
Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China

摘要

摘要: 长棘海星暴发对珊瑚礁生态系统产生了严重危害，而水体营养盐的补充可能是导致长棘海星暴发的一个关键因素。砂质沉积物对调控珊瑚礁区的营养盐浓度和结构起着关键作用，因此本研究通过流动式反应器对长棘海星和砂质沉积物进行模拟实验，分析长棘海星排泄活动及其死亡后有机体降解对水体营养盐的影响，并探究砂质沉积物的响应。实验结果表明：（1）长棘海星排泄的溶解无机氮（DIN）和溶解无机磷（DIP）通量分别为（83.55±4.74）μmol/(ind.·h)和（2.53±0.03）μmol/(ind.·h)，这些营养盐可能给长棘海星的持续暴发提供营养条件；（2）砂质沉积物对长棘海星排泄导致的营养盐浓度升高具有缓冲作用，约70.7%的DIN和91.4%的DIP被截留在沉积物中，但沉积物界面营养盐交换导致的氮磷比升高可能不利于珊瑚生长；（3）长棘海星死后的有机体降解可促使沉积物–水界面释放营养盐，结合海星暴发密度估算，其释放的营养盐可导致上覆水中DIN和DIP浓度分别升高0.32 μmol/L和0.01 μmol/L，这可能会促使大型藻的快速生长而妨碍珊瑚的自我修复。
- 长棘海星 /
- 沉积物 /
- 珊瑚礁 /
- 营养盐 /
- 生态影响
Abstract: The outbreak of crown-of-thorns starfish has seriously threatened the ecological health of coral reefs, and the supplement of nutrients in seawater may be a key factor leading to the outbreak of starfish. Sandy sediments play a key role in regulating the nutrient concentration and structure in coral reefs. Therefore, crown-of-thorns starfish and sandy sediments were incubated using flow-through reactor, to analyze the effects of crown-of-thorns starfish excretion and dead body degradation on nutrient concentration and structure, and to explore the role of sandy sediments under activities of crown-of-thorns starfish. The results were as followed: (1) crown-of-thorns starfish excreted dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) at rates of (83.55±4.74) μmol/(ind.·h) and (2.53±0.03) μmol/(ind.·h), respectively, which maight provide nutritional conditions for the continuous outbreak of starfish; (2) sandy sediments could regulate the nutrient concentration changed by the excretion of starfish, about 70.7% of DIN and 91.4% of DIP were trapped in the sediments, but the increase of DIN/DIP caused by nutrient exchange at the sediment-seawater interface may be detrimental to coral growth; (3) the degradation of starfish organisms could promote the release of nutrients at the sediment-seawater interface. Based on the density of starfish, the released nutrients could cause the concentrations of DIN and DIP in the overlying water to increase by 0.32 μmol/L and 0.01 μmol/L, respectively, which maight promote the rapid growth of macroalgae and hinder the self-restoration of corals.
- crown-of-thorns starfish /
- sediments /
- coral reefs /
- nutrients /
- ecological impacts

HTML全文

图 1 流动式反应器培养装置示意图

Fig. 1 Schematic diagram of flow-through reactor experiments

下载: 全尺寸图片幻灯片

图 2 海星排泄的营养盐通量和海星与沉积物串联时沉积物界面营养盐的交换通量以及培养装置流进和流出海水的DIN/DIP

Fig. 2 The nutrient fluxes by starfish excretion and those at the sediment-seawater interface affecting by starfish and the DIN/DIP in the influent and effluent seawater

下载: 全尺寸图片幻灯片

图 3 沉积物界面营养盐通量在海星有机体降解影响下的时间变化趋势

Fig. 3 The time variation of nutrient fluxes at the sediment–seawater interface under the influence of the degradation of starfish

下载: 全尺寸图片幻灯片

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