遮光水环境中4种南方植物凋落叶分解特性  

Decomposition characteristics of litter from four plant species in a light-limited aquatic environment of south China

作　　者：黄子容 李丽莎 杨钙仁[1,2] 谭家昊 黄宇 HUANG Zirong;LI Lisha;YANG Gairen;TAN Jiahao;HUANG Yu(College of Forestry,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Forest Ecology and Conservation,Nanning 530004,China)

机构地区：[1]广西大学林学院,南宁530004 [2]广西森林生态与保育重点实验室,南宁530004

出　　处：《应用生态学报》2025年第3期755-761,共7页Chinese Journal of Applied Ecology

基　　金：广西重点研发计划项目(桂科AB22080103)资助。

摘　　要：驳岸乔木与湖体草本植物遮蔽形成了南方地区湖体部分水域独特的光照缺乏环境,本研究采用室内分解模拟试验,对南方湖泊与驳岸常用木本植物桂花、榕树以及草本植物美人蕉、狐尾藻凋落叶分解过程中分解底物的残留量、木质素和纤维素含量进行分析,探究该环境下木本、草本植物凋落叶分解与木质素和纤维素释放规律。结果表明:经140 d的分解,桂花、榕树、美人蕉和狐尾藻的失重率分别为46.0%、42.3%、74.4%和68.6%,木本植物分解速率(k)显著低于草本植物。在分解前期(0~7 d),4种植物失重率与k均为整个试验过程中的最高值,4种植物纤维素均呈高释放状态,木本植物桂花(42.9%)、榕树(38.9%)的木质素释放率显著高于草本植物。木本植物桂花的木质素释放率与其k值呈显著正相关,而榕树及草本植物木质素和纤维素释放率与k值相关性均不显著。木质素的释放可能是影响遮光水环境中木本植物分解的关键因子,并调控遮光湖体碳循环过程。The shading of revetment trees and lake herbaceous plants has formed a unique environment of light limi-ting in some water areas of southern lakes.We conducted laboraoty decomposition experiments to analyze the resi-dual amount of decomposition substrates,lignin and cellulose content during the decomposition of fallen leaves of woody plants(Osmanthus fragrans and Ficus microcarpa)and herbaceous plants(Canna glauca and Myriophyllum verticillatum).The aim was to explore the decomposition of fallen leaves and the degradation of lignin and cellulose of woody and herbaceous plants.The results showed that after 140 days of decomposition,the mass loss rates of O.fragrans,F.microcarpa,C.glauca,and M.verticillatum were 46.0%,42.3%,74.4%,and 68.6%,respectively.The decomposition rate of woody plants was significantly lower than herbaceous plants.In the early stage of decomposition(0-7 days),the mass loss rate and decomposition rate(k)were the highest throughout the entire experiment for all the four species.The cellulose of the four plants showed a state of high degradation,and the lignin degradation rates of O.fragrans(42.9%)and F.microcarpa(38.9%)were significantly higher than herbaceous plants.The lignin degradation rate of O.fragrans was significantly positively correlated with k value,while the lignin and cellulose degradation rates of F.microcarpa and herbaceous plants were not significantly correlated with k value,indicating that lignin degradation might be a key factor affecting the decomposition of woody plants in shaded water environments and regulating carbon cycling in shaded lakes.

关 键 词：避光 木本植物 草本植物 分解速率 

分 类 号：S68[农业科学—观赏园艺]