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潘良浩,史小芳,范航清,李斌,陶艳成,宋超,苏治南,谭星儒.广西铁山港围填海导致的高岭土快速沉积致红树林死亡原因分析[J].广西科学院学报,2021,37(3):270-278. [点击复制]
- PAN Lianghao,SHI Xiaofang,FAN Hangqing,LI Bin,TAO Yancheng,SONG Chao,SU Zhinan,TAN Xingru.Analysis of Mangrove Mortality Due to Rapid Kaolinite Deposition Caused by Reclamation in Tieshan Bay, Guangxi[J].Journal of Guangxi Academy of Sciences,2021,37(3):270-278. [点击复制]
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| 广西铁山港围填海导致的高岭土快速沉积致红树林死亡原因分析 |
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潘良浩1,2, 史小芳1,3, 范航清1, 李斌1, 陶艳成1,3, 宋超1, 苏治南1, 谭星儒1
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| (1.广西科学院广西红树林研究中心, 广西红树林保护与利用重点实验室, 广西北海 536000;2.复旦大学生物多样性科学研究所, 生物多样性和生态工程教育部重点实验室, 上海 200438;3.厦门大学环境与生态学院, 滨海湿地生态系统教育部重点实验室(厦门大学), 福建厦门 361102) |
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| 摘要: |
| 为查明广西北海市合浦县白沙镇榄根村龙港新区铁山港东港产业园范围内红树林大面积死亡的原因，对调查区域外源淤积物进行来源分析，并监测沉积物的理化性质，同时结合稳定同位素技术进行溯源。结果表明，在红树林死亡区域和严重退化区域存在大量的白色外源淤积物，越靠近死亡区域中心位置，外源淤积物厚度越大；外源淤积物层平均厚度为7.5-11.1 cm，判定受损红树林区沉积速率高达4.84-6.22 cm/a，外源淤积物以高岭土为主要成分；2017年12月至2020年3月滩涂高程提高10.9-14.0 cm，并由上而下形成“悬浮物+高岭土沉积层→高岭土痕迹层→正常底质层”的土壤垂直结构，该剖面结构表明，沉积过程早期为高岭土主导，后期为吹填悬浮物主导。尽管围填海工程未直接掩埋红树林，但工程导致高岭土及后期悬浮物的快速沉积，改变了红树林受损斑块的表层沉积物理化性质，推测是引发项目区红树林死亡的主要触因。 |
| 关键词: 红树林 外源淤积物 高岭土 悬浮物 快速沉积 |
| DOI：10.13657/j.cnki.gxkxyxb.20210928.012 |
| 投稿时间：2021-06-07 |
| 基金项目:国家重点研发计划科技基础资源调查专项（2017FY100704），广西自然科学基金项目（2017GXNSFBA198009，2018GXNSFBA050011），北海科技计划项目（北科合201995027，北科合201995075）和合浦县林业局项目（GXZC2020-J3-HXHP-001）资助。 |
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| Analysis of Mangrove Mortality Due to Rapid Kaolinite Deposition Caused by Reclamation in Tieshan Bay, Guangxi |
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PAN Lianghao1,2, SHI Xiaofang1,3, FAN Hangqing1, LI Bin1, TAO Yancheng1,3, SONG Chao1, SU Zhinan1, TAN Xingru1
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| (1.Guangxi Key Lab of Mangrove Conservation and Utilization, Guangxi Mangrove Research Center, Guangxi Academy of Sciences, Beihai, Guangxi, 536000, China;2.Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai, 200438, China;3.Key Laboratory of the Coastal and Wetland Ecosystems (Xiamen University), Ministry of Education, College of the Environment & Ecology, Xiamen University, Xiamen, Fujian, 361102, China) |
| Abstract: |
| In order to find out the causes of large area death of mangrove forest in Donggang Industrial Park of Tieshan Bay, Longgang New District, Lan'gen Village, Baisha Town, Hepu County, Beihai City, Guangxi Province, the source of exogenous sediment in the survey area was analyzed, and the physical and chemical properties of sediment were monitored. At the same time, stable isotope technology was used to trace the source. The results showed that there was a large number of white exogenous sediment in the dead area and severely degraded area of mangrove. The closer to the center of the dead area, the greater the thickness of exogenous sediment was. The average thickness of exogenous sediment layer was 7.5-11.1 cm, and the sedimentation rate in the damaged mangrove area was judged to be as high as 4.84-6.22 cm/a. Kaolinite was the main component of exogenous sediment. From December 2017 to March 2020, the beach elevation increased by 10.9-14.0 cm, and the vertical soil structure of "suspended substance+ kaolinite sediment layer→kaolinite trace layer → normal sediment layer" was formed from top to bottom. The profile structure showed that the sedimentary process was dominated by kaolinite in the early stage and by reclaimed suspension in the later stage. Although the reclamation project did not directly bury the mangrove forest, the project led to the rapid deposition of kaolinite and the suspended substance in the later stage, which changed the physical and chemical properties of the surface sediment of the damaged patches of mangrove forest, which was speculated to be the main trigger of mangrove death in the project area. |
| Key words: mangrove exogenous sediment kaolinite suspended substance rapid deposition |
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