厦门大学学报（自然科学版）2025，Vol.64Issue(3)：383-393,11.DOI:10.6043/j.issn.0438-0479.202407018
本地植物秋茄和入侵植物互花米草凋落叶有机组分的分解动态分析
Analyses of decomposition dynamics of organic components in the leaf litter of native plant Kandelia obovata and invasive plant Spartina alterniflora
摘要
Abstract
[Objective]Leaf litter is an important component of mangrove ecosystem productivity,with a portion exported to adjacent ecosystems in the form of soluble organic matter or plant tissue,supporting numerous consumers.The invasion of Spartina alterniflora can affect the production and decomposition dynamics of leaf litter in local ecosystems,leading to changes in their primary productivity.This study explores the impact of invasion of the exotic plant S.alterniflora on the decomposition dynamics of leaf litter in local ecosystems.[Methods]This study focused on the decomposing leaf litter of the native plant Kandelia obovata and the exotic plant S.alterniflora.Using the in-situ decomposition bag method,we comparatively analyzed the decomposition dynamics of organic components(water-soluble component,acid-soluble component,and acid-insoluble component)of K.obovata and S.alterniflora leaf litter in a native mangrove site and an invasive salt marsh site in Zhangjiang Estuary Mangrove Wetland,Fujian Province.[Results]This study compared and analyzed the decomposition dynamics of organic components in leaf litter of the native plant K.obovata and the exotic plant S.alterniflora in mangrove and salt marsh plots.The results showed that the initial mass fractions of water-soluble and acid-insoluble components in the leaf litter of K.obovata were significantly higher than those of S.alterniflora(P＜0.05),while the initial mass fraction of acid-soluble components was significantly lower than that of S.alterniflora(P＜0.05).During the decomposition of leaf litter,the mass fraction and remaining rate of water-soluble component in the leaf litter of K.obovata and S.alterniflora gradually decreased.The mass fraction and remaining rate of acid-soluble component first decreased,then increased,and finally decreased.In comparison,the mass fraction of acid-insoluble component first increased,then decreased,and finally increased again,while the remaining rate of acid-insoluble components first increased and then decreased.In the mangrove plot,the decomposition rates of water-soluble and acid-soluble components in the leaf litter of K.obovata were higher than those of S.alterniflora,but the decomposition rate of acid-insoluble component was lower.The semi-decomposition cycles for the water-soluble components were(16.438±1.997)d and(17.773±1.227)d,for the acid-soluble components were(6.100±1.602)d and(9.735±6.271)d,and for the acid-insoluble components were(93.153±2.927)d and(44.680±5.837)d,respectively.In the salt marsh plot,the decomposition rates of water-soluble components,acid-soluble components,and acid-insoluble components in the leaf litter of K.obovata were all higher than those of S.alterniflora.The semi-decomposition cycles for the water-soluble components were(16.865±2.555)d and(24.231±4.145)d,for the acid-soluble components,were(6.188±1.928)d and(16.617±2.175)d,and for the acid-insoluble component(187.587±6.798)d and(224.012±5.681)d,respectively.There was a significant positive correlation between the mass fraction of water-soluble components and the remaining rate,as well as between the mass fraction of acid-soluble components and the remaining rate,in both K.obovata and S.alterniflora.However,a significant negative correlation was found between the mass fraction of acid-insoluble components and the remaining rate.Decomposition time had a significant impact(P＜0.001)on the mass fractions of water-soluble components,acid-soluble components,acid-insoluble components,and the remaining rate in the leaf litter of both species.[Conclusion]It can be seen that the exotic plant S.alterniflora,with its higher mass fraction of acid-soluble organic components and relatively lower decomposition rate compared to the native plant K.obovata,has a significant impact on the decomposition dynamics of organic components in leaf litter within the mangrove ecosystem.This finding reveals how S.alterniflora alters the material cycling and energy flow in the native ecosystem through its unique chemical composition and decomposition characteristics during the invasion.These results not only contribute to a deeper understanding of material cycling in the ecosystem during the invasion and subsequent restoration of S.alterniflora,but also provide important scientific evidence for assessing the ecological impacts of this exotic species.This further emphasizes the importance of considering the impact of exotic plant invasions on the functions of native ecosystems when conducting ecosystem management and restoration.关键词
凋落叶分解/红树林湿地/生物入侵/有机组分/互花米草/秋茄Key words
decomposition of leaf litter/mangrove wetland/biological invasion/organic component/Spartina alterniflora/Kandelia obovata分类
环境科学引用本文复制引用
宋晓英,王飞杰,海菁珺,刘永华,王淏林,魏淑东,陈卉..本地植物秋茄和入侵植物互花米草凋落叶有机组分的分解动态分析[J].厦门大学学报（自然科学版）,2025,64(3):383-393,11.基金项目
国家自然科学基金(32371682) （32371682）
