| 引用本文： |
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李斌,巫冷蝉,宋超,刘成辉.高岭土悬浮物对榄根村红树林湿地底质环境的影响[J].广西科学院学报,2021,37(3):279-287. [点击复制]
- LI Bin,WU Lengchan,SONG Chao,LIU Chenghui.Influences of Kaolinite Suspended Substances on the Sediment Environment of Mangrove Wetland in Lan'gen Village[J].Journal of Guangxi Academy of Sciences,2021,37(3):279-287. [点击复制]
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| 摘要: |
| 为探明高岭土悬浮物的影响范围及其对榄根村红树林底质环境的影响，2020年3月在榄根村死亡红树林的林内、林缘、附近正常红树林、对照林区及潮沟开展底质环境调查采样。结果表明：死亡红树林的林内、林缘和附近正常红树林内的高岭土悬浮物主要沉积在表层10-20，5-10和0-5 cm内，对应层次的平均铝含量分别为9.15%，10.8%和7.10%，而对照林区沉积物柱状样的平均铝含量为3.60%。靠近陆域填土区的潮沟（S1-S3站位）底质平均铝含量为5.94%，其他监测潮沟（S4-S7站位）的平均铝含量为1.86%。调查区域各监测指标基本满足一类海洋沉积物质量标准，但靠近陆域填土区的潮沟、死亡红树林及其附近正常红树林内的底质平均pH值均低于相应的对照区；死亡红树林的林内、林缘和附近正常红树林底质中的铜、铅和铬含量是对照林区的2倍左右，靠近陆域填土区的潮沟底质铅亦是对照潮沟区的2倍。死亡红树林底质的综合肥力系数为0.59，低于对照林区的0.69。综上可见，高岭土悬浮物主要影响榄根村红树林湿地表层20 cm以内的底质环境，并以陆域填土区为中心，在半径约540 m的范围内大量沉积，在半径540-1 075 m的扇形区域内少量沉积，导致死亡红树林及靠近陆域填土区的潮沟底质pH值降低，加重了附近正常林区的底质酸化。高岭土悬浮物富含铜、铅和铬，影响湿地底质环境质量，并存在重金属富集的风险。 |
| 关键词: 高岭土悬浮物 榄根村 红树林 底质环境 铝 |
| DOI：10.13657/j.cnki.gxkxyxb.20210928.006 |
| 投稿时间：2021-06-02 |
| 基金项目:合浦县林业局项目（GXZC2020-J3-HXHP-001）资助。 |
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| Influences of Kaolinite Suspended Substances on the Sediment Environment of Mangrove Wetland in Lan'gen Village |
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LI Bin, WU Lengchan, SONG Chao, LIU Chenghui
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| (Guangxi Key Lab of Mangrove Conservation and Utilization, Guangxi Mangrove Research Center, Guangxi Academy of Sciences, Beihai, Guangxi, 536000, China) |
| Abstract: |
| In order to investigate the influence range of kaolinite suspended substances and its influence on the mangrove sediment environment in Lan'gen Village, sediment environment investigation and sampling were carried out in the dead mangroves, the edge of the dead mangroves, the nearby normal mangroves, control mangroves and the tidal ditch in March 2020. The results showed that in the dead mangroves, the edge of the dead mangroves and the nearby normal mangroves, kaolinite suspended substances were mainly deposited in the surface layer of 10-20, 5-10 and 0-5 cm, respectively. The average contents of aluminum in the corresponding layers were 9.15%, 10.8% and 7.10%, while the average aluminum content of the sediment core in the control mangrove area was 3.60%. The average content of aluminum in the tidal creek (S1-S3) near the land filling area was 5.94%, while the average aluminum content in the other tidal creek (S4-S7) was 1.86%. The monitoring indicators in the survey area basically met the quality standard of the first-class marine sediments. But the average pH value of sediment in the tidal creek, dead mangroves and normal mangroves near the land fill area was lower than that in the corresponding control mangroves. The contents of Cu, Pb and Cr in the sediment of the dead mangroves, the edge of the dead mangroves and the nearby normal mangroves were about twice as much as that in the control mangroves, and the content of Pb in the tidal creek near the land filling area was also twice as much as that in the control tidal creek. The coefficient of comprehensive fertility of the dead mangrove sediment was 0.59, which was lower than 0.69 in the control mangroves. In summary, kaolinite suspended substances mainly affected the sediment environment within 20 cm of the surface layer of the mangrove wetland in Lan'gen Village. Taking the land filling area as the center, a large number of sediment was deposited in the range with radius of 540 m, and a small amount of sediment was deposited in the sector area with radius of 540-1 075 m. This led to the decrease of pH value in the sediment of dead mangroves and tidal creek near the land filling area, and aggravated the sediment acidification of the nearby normal forest area. Kaolinite suspended substances are rich in Cu, Pb and Cr, which affects the quality of wetland sediment environment and has the risk of enrichment of heavy metals. |
| Key words: kaolinite suspended substances Lan'gen Village mangrove sediment aluminum |
