黔中喀斯特次生林木本植物更新动态特征  

Dynamic characteristics of woody plant regeneration in karst secondary forests in central Guizhou

作　　者：王梦洁 容丽[1,2] 叶天木 王琪[1,2] 李婷婷[1,2] 李璇 杨文松[1,2] WANG Mengjie;RONG Li;YE Tianmu;WANG Qi;LI Tingting;LI Xuan;YANG Wensong(School of Geography and Environmental Sciences(School of Karst Science),Guizhou Normal University,Guiyang 550001,China;Puding Karst Ecosystem Research Station,Chinese Academy of Sciences,Puding 562100,China)

机构地区：[1]贵州师范大学地理与环境科学学院(喀斯特研究院),贵阳550001 [2]中国科学院普定喀斯特生态系统观测研究站,普定562100

出　　处：《应用与环境生物学报》2022年第6期1586-1593,共8页Chinese Journal of Applied and Environmental Biology

基　　金：国家重点研发计划专项(2022YFF1300703);贵州省科技计划重大专项([2017]5411);贵州省世界一流学科建设计划项目([2019]125)资助。

摘　　要：为探讨喀斯特次生林更新变化特征,基于黔中天龙山常绿落叶阔叶混交林样地的群落数据(2012年、2020年),分析林下更新层的物种组成、重要值、多样性以及分布特征等动态变化.结果表明:(1)在调查的2 hm2样地内物种个体数由10 276株减少到7 837株,隶属于33科55属,共69种,物种新增5科10属18种,消失7科9属11种;物种间的重要值差异明显,窄叶石栎(Lithocarpus confinis)为20.97-23.26,远高于其他物种.除部分物种外,总体年际差异不大,中生性和阴生性物种地位上升;生活型以小乔木、灌木或小乔木为主,不同生活型的株数密度均降低;(2)灌木的Margalef指数、Shannon-Wiener指数最大,灌木或小乔木的Pielou指数最大.大部分生活型的组成物种增多,多样性更丰富且物种个体分布均匀程度增大,但变化较小;(3)物种空间分布格局总体呈聚集分布,少数呈随机分布.物种的Cx、I、m*、CA、G指数均减少,且部分物种差异较大,可能出现聚集分布向随机分布的态势,但窄叶石栎的聚集程度仍较高.多数物种的PAI指数增大且不明显,K值则呈不规则变化.整体而言,该群落物种组成、重要值、多样性以及主要物种空间分布格局具有一定变化,但未发生明显波动,窄叶石栎仍为演替中的主要优势种,区系物种组成稳定,植被恢复慢,整个群落发展和缓.(表5参39)Based on community data(2012, 2020) of the Tianlong Mountain evergreen and deciduous broadleaved mixed forest plot in central Guizhou, China, the species composition, importance value index, diversity, and dynamic changes were estimated to explore the renewal and change characteristics of karst secondary forests.The results showed that:(1) the number of individual species in the investigated two hm2 plot encompassing 33 families and 55 genera, totaling 69 species decreased from 10 276 to 7837. Five families, 10 genera, and 18 species were newly added, while seven families, nine genera, and 11 species disappeared. The difference between the importance value indices of the species was obvious;that of Lithocarpus confinis(20.97–23.26)was much higher than that of other species. Except for some species, the overall inter-annual differences were not large, and the status of mesophytic and shaded species has increased. Life forms were dominated by small trees and shrubs or small trees, and the plant number density of different life forms is reduced.(2) The Margalef and Shannon-Wiener indices of shrubs were the largest, and the Pielou indices of shrubs or small trees were the largest. The composition of most life forms has increased;the diversity became richer;and the uniform distribution of individual species has increased, but the change was small.(3) With respect to the spatial distribution pattern,the species were generally clustered, and only a few were randomly distributed. The Cx, I, m*, CA, and G indices of the species were reduced, and those of some species were quite different. A tendency for aggregated distribution was observed over random distribution, but the aggregation degree of Lithocarpus sphaerocephala was still high.The PAI index of most species increased but was not obvious, whereas the K value changed irregularly. Overall,the species composition, importance value index, diversity, and spatial distribution pattern of the main species in this community have changed to some extent but without any sign

关 键 词：喀斯特 次生林 更新变化 物种多样性 分布特征 

分 类 号：S718.5[农业科学—林学]