间伐对尾巨桉林植物多样性和水源涵养功能的影响  

Effects of Thinning Intensity on Plant Diversity and Water Conservation of Eucalyptus urophylla × E. grandis

作　　者：朱原立 苏福聪 任世奇[3,2] 陈健波 项东云[3,2] 郭东强 邓紫宇[3,2] 江顺达 ZHU Yuanli;SU Fucong;REN Shiqi;CHEN Jianbo;XIANG Dongyun;GUO Dongqiang;DENG Ziyu;JIANG Shunda(Guangxi State-owned Qipo Forest Farm,Nanning 530225,Guangxi,China;Guangxi Forestry Research Institute,Nanning 530002,Guangxi,China;Guangxi Nanning Eucalypt Plantation Ecosystem Observation and Research Station,Nanning 530002,Guangxi,China)

机构地区：[1]广西国有七坡林场,广西南宁530225 [2]广西南宁桉树林生态系统定位观测研究站,广西南宁530002 [3]广西壮族自治区林业科学研究院,广西南宁530002

出　　处：《桉树科技》2018年第3期9-15,共7页Eucalypt Science & Technology

基　　金：广西科技重大专项(AA17204087-9);广西林业科技项目(桂林科研[2015]第43号);广西林业科技项目(桂林科字[2016]第30号);广西优良用材林资源培育重点实验室自主课题(16-A-04-03)

摘　　要：为了解间伐强度对桉树林植物多样性和水源涵养功能的影响,通过设置未间伐、间伐强度33%和间伐强度50%3种处理,研究间伐4a后尾巨桉林的植物多样性和水源涵养能力。结果表明:在3种密度林分中,越南悬钩子重要值明显大于其他灌木植物且随间伐强度的增强而增大;芒萁和乌毛蕨重要值也始终大于其他草本植物但随间伐强度的增强呈递减趋势。灌木植物的Shannon-Wiener指数、Simpson指数和均匀度指数随间伐强度的增强而降低,而草本植物的物种多样性指数差异不显著。枯落物蓄积量、最大持水率和最大持水量表现为未间伐林分与间伐强度50%林分基本一致,二者大于间伐强度33%林分,但总体差异不显著。3种密度林分的土壤最大持水量、毛管持水量和非毛管持水量基本一样。综合水源涵养能力表现为:间伐强度50%林分>未间伐林分>间伐强度33%林分。To evaluate the effects of thinning on plant diversity and water conservation in Eucalyptus urophylla×E.grandis plantations,three different thinning regimes were carried out:no thinning(0%thinning);33%thinning intensity;and,50%thinning intensity.Results from assessments at four years after thinning showed that following all three thinning intensities the prevalence of Rubus cochinchinensis in the understory was higher than other shrubs,and that its abundance increased as thinning intensity increased.The prevalence of plants of Dicranopteris dichotoma and Blechnum orientale.were also higher than other herbaceous species but both decreased as thinning intensity increased.Indices of Shannon-wiener,Simpson and‘shrub evenness’all decreased as thinning intensity increased,but there was no significant difference in the herb species diversity index among different thinning intensities.Litter accumulation,maximum water holding rate and maximum water holding capacity were basically the same between 0%thinning and 50%thinning,and values from both these treatments were higher than values of these parameters under 33%thinning,but none of the differences in these parameters among thinning intensities were significant.The maximum soil moisture capacity,capillary water holding capacity and non-capillary water holding capacity were almost the same among the stands subject to the three thinning intensities.The comprehensive water conservation capacities in stands subject to the different thinning intensities were ranked as follows:50%thinning intensity>not thinning>33%thinning intensity.

关 键 词：尾巨桉 间伐 植物多样性 水源涵养 

分 类 号：S753[农业科学—森林经理学]