林分密度对云顶山柏木人工林林下物种多样性和生物量的影响  

Effects of Stand Density on Understory Plant Diversity and Biomass in a Cupressus funebris Plantation in Yunding Mountain

作　　者：陈波兰 吴雨茹 钟欣艺 许银 陈辉琴 唐岚 白一术 郝建锋[1,2] CHEN Bolan;WU Yuru;ZHONG Xinyi;XU Yin;CHEN Huiqin;TANG Lan;BAI Yishu;HAO Jianfeng(College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;Key Laboratory of Soil and Water Conservation and Desertification Control,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学林学院,成都611130 [2]四川农业大学水土保持与荒漠化防治重点实验室,成都611130

出　　处：《四川农业大学学报》2023年第4期665-672,共8页Journal of Sichuan Agricultural University

基　　金：国家自然科学基金(31370628);四川省教育厅一般项目(15ZB0020)。

摘　　要：【目的】为探究林分密度对林下植被物种多样性和生物量的影响及二者之间的相关性。【方法】采用典型样地法对四川省金堂县云顶山5种不同林分密度(500、650、800、950、1100株/hm^(2))的柏木(Cupressusfunebris)人工林进行植被调查,统计林下物种多样性和生物量。【结果】共记录植物172种,隶属于78科137属。随着林分密度增大,灌木层多样性指数均呈先增后减的单峰变化,基本在密度650株/hm^(2)达到最大,草本层多样性指数则多呈先增后减再增再减的双峰变化,在密度650株/hm^(2)和950株/hm^(2)出现峰值。灌木、草本层生物量均在密度650株/hm^(2)达到最大且均有地上生物量大于地下生物量。灌木层物种重要值与其各层生物量和草本层地上、全株生物量均呈极显著正相关,草本层物种重要值与其地上、全株生物量均呈极显著正相关。【结论】研究认为该地柏木人工林可在650株/hm^(2)的密度下维持较高的林下植被物种多样性和生物量,利于其林下植被的健康发展。【Objective】This paper aims to explore the influence of stand density on species diversity and biomass of understory vegetation and the correlation between them.【Method】In this study,the typical site method was used to investigate the Cupressus funebris plantations with five different forest densities(500,650,800,950 and 1100 tree/hm^(2))in Yunding Mountain,Jintang County,Sichuan Province,to calculate the diversity and biomass of the understory species.【Result】The results showed that a total of 172 plant species were recorded,belonging to 137 genera of 78 families.With the increase of stand density,the diversity index of shrub layer showed a unimodal change of first increase and then decrease,basically reached the maximum at the density of 650 tree/hm^(2),while the diversity index of herbaceous layer mostly showed bimodal changes of first increase and then decrease and then increase and then decrease,with peak values at the densities of 650 tree/hm^(2) and 950 tree/hm^(2).The biomass of shrub and herbaceous layer reached the maximum at the density of 650 tree/hm^(2),and the aboveground biomass was greater than the underground biomass.The important values of shrub species were highly positively correlated with their biomass of each layer and the aboveground and whole plant biomass of the herbaceous layer,and the important values of the species in the herbaceous layer were highly positively correlated with their aboveground and whole plant biomass.【Conclusion】It is concluded that the cypress plantation can maintain high species diversity and biomass of understory vegetation at a density of 650 tree/hm^(2),which is conducive to the healthy development of understory vegetation.

关 键 词：林分密度 柏木人工林 林下植被 物种多样性 生物量 

分 类 号：S718.54[农业科学—林学]