| 摘要: |
| 为探究红树林死亡后短期内的沉积物理化性质与微生物群落特征的变化, 以北海市白龙港健
康和死亡红树林为研究对象, 对比分析健康与死亡红树林生态系统沉积物的 pH、 总有机碳、 水溶性盐、
总硫化物、 机械组成以及微生物的多样性和群落结构。 结果表明, (1) 沉积物的 pH、 总有机碳和水溶性
盐含量在健康与死亡红树林间差异不显著, 但健康红树林的总硫化物含量显著大于死亡红树林 ( P <
0. 05); (2) 0~20 cm 的沉积物机械组成在健康与死亡红树林中较为相似, 但健康红树林 20 ~ 40 cm 的沉
积物主要由粗砂粒组成, 而死亡红树林中主要由细砂粒组成; (3) 健康红树林沉积物 α 多样性显著大于
死亡红树林 (P<0. 05), β 多样性差异不显著, 健康与死亡红树林中微生物类群组成大体相似, 少数微生
物群落如酸杆菌门 (Acidobacteriota)、 迟杆菌门 (Latescibacterota) 和放线菌门 (Actinobacteriota) 等相
对丰度在两者之间存在显著差异 (P<0. 05); (4) 健康红树林沉积物中 pH、 总有机碳和水溶性盐两两之
间存在极显著相关性 (P<0. 01), 而在死亡红树林中只有总有机碳与微生物多样性呈显著负相关 (P<
0. 05)。 综上, 红树林死亡后短期内变化较大的是沉积物的总硫化物含量、 微生物的 α 多样性、 以及理化
因子与微生物多样性之间的相互关系。 未来研究应进一步关注红树林退化死亡的长期生态效应, 为红树
林生态系统的可持续发展提供更多的科学支持。 |
| 关键词: 红树林沉积物 理化性质 微生物群落 多样性 退化死亡 |
| DOI： |
| 分类号: |
| 基金项目:广西重点研发计划项目 (桂科 AB23026057), 广西林业科技推广示范项目 (2023GXLK07), 中央财政林业科技推广示范 项目 ( [2023] TG28 号) |
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| Comparative Analysis of Sediment Characteristics Between Live and Dead Mangroves |
|
Huang Xiaoying1, Wei Haihang2, Qin Jie2, Tian Hongdeng2, Yang Jingjun2, Li Jinhua2, Qin Zhenkai2, Liu Xiu2
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1.Scientific Research Academy of Guangxi Environmental Protection;2.Guangxi Forestry Research Institute
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| Abstract: |
| To investigate the changes in the physicochemical properties and microbial community structure
of mangrove sediments in the short term after mangrove death, we compared pH, total organic carbon (TOC), water soluble salt (WS), total sulfide (TS), mechanical composition ( SC), microbial diversity and community structure of sediments of live and dead mangrove ecosystems in Bailonggang, Beihai. The results
showed that: (1) There were no significant differences in pH, TOC and WS contents between live and dead
mangroves, but the TS content of live mangroves was significantly higher than that of dead mangroves (P <
0. 05). (2) The mechanical composition of 0-20 cm sediments in live mangroves was similar to that in dead
mangroves, but the 20-40 cm sediments in live mangroves were mainly composed of coarse sand grains while
those in dead mangroves were mainly composed of fine sand grains. (3) The α diversity of microbe in live
mangrove sediment was significantly greater than that of dead mangrove sediment (P<0. 05), but there was no
significant difference in β diversity. The composition of microbial groups in the live and dead mangroves was
similar, but the relative abundances of a few microbial groups, such as Acidobacteriota, Latescibacterota and
Actinobacteriota, were significantly different from each other (P<0. 05). (4) There was a significant correlation between pH, TOC and WS in live mangrove (P<0. 01), while only TOC was significantly negatively correlated with microbial diversity in dead mangroves (P<0. 05). In conclusion, in the short term after mangrove
death, the contents of TS, α diversity of microbe, and the relationship between physicochemical factors and
microbial diversity changed greatly. Future studies should further focus on the long-term ecological effects of
mangrove degeneration and death, to provide more scientific support for the sustainable development of mangrove ecosystems. |
| Key words: mangrove sediment physicochemical property microbial community diversity degeneration and death |
