现代农业科技Issue(5)：105-110,6.DOI:10.3969/j.issn.1007-5739.2024.05.027
贵州喀斯特生态系统不同恢复阶段植物群落凋落物及碳氮归还动态
Dynamics of Plant Community Litter and Carbon and Nitrogen Recycling at Different Restoration Stages in Guizhou Karst Ecosystem
摘要
Abstract
Litter is an important component of carbon pool in forest ecosystems.In this study,we conducted a one-year positioning observation on the total litter biomass,litter components(leaves,branches,flowers and fruits)characteristics,monthly dynamics of litter biomass,and carbon and nitrogen recycling of plant communities at five different restoration stages(sparse tussock,throny shrubland,low shrubland,shrub-tree transitional forest,secondary arbor forest)of the karst ecosystem in Puding,Guizhou Province.The results showed that the annual total litter biomass of above five different successional communities were 726.0,3811.6,5161.0,4378.8,4604.8 kg/hm2,respectively.With the recovery and development of the community,the total litter biomass showed a trend of first increasing and then decreasing slowly.The leaf litter biomass,branch litter biomass,flower and fruit litter biomass of plant communities in each restoration stage accounted for 64.2% -74.9% ,11.4% -18.1% and 9.8% -19.5% of the total litter biomass,respectively.In the early stage of community restoration(sparse tussock,throny shrubland,low shrubland),the monthly dynamics of litter biomass showed a unimodal pattern,while in the middle and later stages of community restoration(other two successional communities),the monthly dynamics of litter biomass showed a bimodal pattern.The monthly dynamics of leaf litter biomass and total litter biomass of plant communities at each restoration stage were basically consistent.The contents of C and N generally showed flower and fruit litter>leaf litter>branch litter.As for plant communities at five different restoration stages,there was a significant positive correlation between the annual total recycling amount of C and N in the litter and their annual total litter biomass.关键词
凋落物/恢复阶段/植物群落/碳氮归还动态/贵州喀斯特生态系统Key words
litter/restoration stage/plant community/carbon and nitrogen recycling dynamics/Guizhou karst ecosystem分类
农业科技引用本文复制引用
熊红福..贵州喀斯特生态系统不同恢复阶段植物群落凋落物及碳氮归还动态[J].现代农业科技,2024,(5):105-110,6.基金项目
贵州省教育厅自科项目(黔教合KY字[2020]175) （黔教合KY字[2020]175）
铜仁学院博士科研启动基金(trxydh1825). （trxydh1825）
