摘要
为实现“碳中和”背景下的森林高质量经营,探索林分密度调控对森林生态系统土壤呼吸和林下植被物种多样性的影响具有非常重要的意义。以山西五台山林区华北落叶松(Larix principis-rupprechtii)天然次生林为研究对象,设置不同林分密度样地,调查林下植被物种多样性并测定土壤呼吸速率,分析林分密度对林下植被物种多样性和土壤呼吸速率的影响以及物种多样性和土壤呼吸速率的耦合关系。结果表明,喜光植物的重要值随林分密度增加而逐渐降低,在高密度林分中变成偶见种或消失,耐荫植物的重要值随林分密度增加而升高,在高密度林分中成为代表性种。林下植被物种多样性和土壤呼吸速率均随林分密度增加均呈先上升后下降的趋势;香农-威纳指数、辛普森指数、基于香农-威纳指数的均匀度指数、基于辛普森指数的均匀度指数和物种丰富度指数均在中密度下达到峰值,土壤呼吸速率也在中密度下达到峰值;植被种类、林下植被物种多样性指数与土壤呼吸速率的相关性极强,其中物种丰富度指数对土壤呼吸速率的影响最显著。
To achieve high-quality forest management under background of "carbon neutrality", it is of great significance to explore effects of stand density regulation on soil respiration in forest ecosystems and understory vegetation species diversity. Natural secondary Larix principis-rupprechtii forest in forest area of Wutai Mountain, Shanxi province was taken as research object. By setting up sample plots with different stand densities,species diversity of understory vegetation was investigated and soil respiration rate was measured. Effects of stand densities on understory vegetation species diversity, soil respiration rate, and coupling relationship between species diversity and soil respiration rate were analyzed. Results showed that important values of lightloving plants gradually decreased with increase of stand density and became occasional species or disappeared in high-density stands. Important values of shade-tolerant plants increased with increase of stand density and became representative species in high-density stands. Understory vegetation species diversity and soil respiration rate both increased firstly and then decreased with increase of stand density. Shannon-Wiener index, Simpson index, evenness index based on Shannon-Wiener index, evenness index based on Simpson index and species richness index peaked at medium density, and soil respiration rate also peaked at medium density. Vegetation species and understory vegetation species diversity indexes were strongly correlated with soil respiration rate, and species richness index had the most significant effect on soil respiration rate.
作者
刘洪柳
王泽鑫
郭晋平
张芸香
Liu Hongliu;Wang Zexin;Guo Jinping;Zhang Yunxiang(College of Forestry,Shanxi Agricultural University,Taigu,Shanxi 030801,China)
出处
《广西林业科学》
2022年第2期190-196,共7页
Guangxi Forestry Science
基金
山西农业大学学术恢复科研专项(2020XSHF34)。
关键词
林分密度
华北落叶松
土壤呼吸
林下植被物种多样性
stand density
Larix principis-rupprechtii
soil respiration
understory vegetation species diversity
