华西雨屏区常绿与落叶阔叶混交林下凋落物分解特性研究  

Study on the decomposition characteristics of litter in evergreen and deciduous broad-leaved mixed forests in the rainy area of west China

作　　者：李玲[1] 王玉杰 张远彬 蒋豪 李平 补春兰 涂卫国[1] LI Ling;WANG Yujie;ZHANG Yuanbin;JIANG Hao;LI Ping;BU Chunlan;TU Weiguo(Sichuan Provincial Institute of Natural Resource Sciences,Chengdu 610015,China;Chengdu Ecological Environment Monitoring Center Station of Sichuan Province,Chengdu 610066,China;Institute of Mountain Hazards and Environment,Ministry of Water Resources,Chinese Academy of Sciences,Chengdu 610299,China;Daxiangling Nature Reserve Management and Protection Center in Yingjing County,Yingjing 625201,China)

机构地区：[1]四川省自然资源科学研究院,四川成都610015 [2]四川省成都生态环境监测中心站,四川成都610066 [3]中国科学院、水利部成都山地灾害与环境研究所,四川成都610299 [4]荥经县大相岭自然保护区管理局,四川荥经625201

出　　处：《四川林业科技》2025年第1期105-112,共8页Journal of Sichuan Forestry Science and Technology

基　　金：四川省重点研发项目(2023YFS0367);西南野生动植物资源保护教育部重点实验室开放基金项目(XNY21-05);成都市科技项目(2024-YF05-01138-SN)。

摘　　要：为了探究华西雨屏带常绿落叶阔叶混交林下凋落物分解特性,在龙苍沟国家级森林公园布设了阔叶、柳杉、草本及其混合凋落物样品,分析了2.1 a内凋落物质量及营养元素随时间变化情况。研究结果显示:(1)柳杉、阔叶、草本和混合t95%分别为11.85、5.89、4.03、8.13 a,凋落物最终质量残留率在20%~60%之间;(2)草本、阔叶和混合分解速率在初期最大,并呈季节性变化,柳杉分解速率在后期最大,无季节性变化;(3)混合凋落物分解呈非加和效应,各组分在1.0 a之前表现为协同效应,1.0 a之后表现为拮抗效应,其分解速率在秋冬季降幅最大,出现了C、N、P、K的积累,对季节变化最敏感;(4)4种凋落物的分解具有质量与营养元素双重释放格局,C、N、P最终残留率在20%~60%之间,C、N、P浓度随着时间增加基本呈波动性变化;(5)凋落物初始分解速率与初始C/N不完全相关,但从总的分解过程来看,凋落物质量残留率与C/N呈极显著正相关,N在该区域凋落物分解过程中起着关键作用。In order to investigate the decomposition characteristics of litter in evergreen and deciduous broad-leaved mixed forestd in the rainy area of west China,samples of broad-leaved,Cryptomeria fortunei,herbaceous and their mixed litter were arranged in Longcanggou National Forest Park.The changes of litter quality and nutrient elements with time within 2.1 years were analyzed.The research results showed that:(1)The t95%of Cryptomeria fortunei,broad-leaved,herbaceous,and mixed litter were 11.85,5.89,4.03,and 8.13 a,respectively,and the final residual mass rate of litter was between 20 and 60%;(2)The decomposition rates of herbaceous,broad-leaved,and mixed litter were highest in the early stages and showed seasonal changes,while the decomposition rate of Cryptomeria fortunei was the highest in the later stage,and showed no seasonal changes;(3)The decomposition of mixed litter exhibited a nonadditive effect,and the compoents showed synergistic effect before 1.0 a and antagonistic effect after 1.0 a.(4)The decomposition rate of four kinds of litters had a doubld release pattern of mass and nutrient component,and the final residual rate of C,N,P,and P was bewteen 20-60%.The changes;(4)The decomposition of four types of litter exhibited a dual release pattern of quality and nutrient elements,with final residual rates of C,N,and P ranging from 20%to 60%.The concentration of C,N,and P basically fluctuated with time;(5)The initial decomposition rate was not completely correlated with the initial C/N ratio,but from the overall decomposition process,the residual mass rate of was significantly positively correlated with C/N ratio,and N plays a key role in litter decomposition process in this area.

关 键 词：华西雨屏 常绿与落叶阔叶混交林 凋落物分解 季节变化 非加和效应 

分 类 号：S714[农业科学—林学]