不同混交模式对桉树生长特性及林下植物多样性的影响  

Effects of Different Mixed Patterns on Growth Characteristics and Understory Plant Diversity of Eucalypt

作　　者：刘鑫 黄兰清 苏立军 吴跃海 余玉珠 郭萍 任世奇[2] 邓力 LIU Xin;HUANG Lanqing;SU Lijun;WU Yuehai;YU Yuzhu;GUO Ping;REN Shiqi;DENG Li(Guangxi Zhuang Autonomous Region State-owned Qinlian Forest Farm,Qinzhou 535000,Guangxi,China;Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning 530002,Guangxi,China)

机构地区：[1]广西壮族自治区国有钦廉林场,广西钦州535000 [2]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》2024年第1期45-51,共7页Eucalypt Science & Technology

基　　金：广西重点研发计划(桂科AB23026010);广西科技基地和人才专项(桂科AD20325008);广西自筹经费林业科技项目(桂林科研﹝2022ZC﹞第97号)。

摘　　要：采用样地调查法,分析巨尾桉纯林(CK)、巨尾桉×刨花润楠混交模式(T1)和巨尾桉×红锥混交模式(T2)3个处理的巨尾桉生长特性及灌木、草本层物种组成、重要值和多样性特征,以期为科学经营桉树混交林提供参考。结果表明:在混交模式中,混交树种刨花润楠和红锥长势均较好;巨尾桉的树高、胸径、单株材积和蓄积量均显著高于纯林,但2个混交模式之间无显著差异。CK、T1和T2林下植物分别有17科23属24种、18科24属25种和23科28属29种。3种造林模式灌木层的物种丰富度(S)、Shannon-wiener指数(H)和群落均匀度(J)均高于草本层,灌木层中的茜草科、马鞭草科,草本层中的禾本科植物和蕨类植物种类及数量多。结合林分生长和林下植物多样性指标,T2可作为今后桉树混交林经营的参考模式。Growth characteristics,species composition,importance value and diversity characteristics of the shrub and herbaceous layer of Eucalyptus grandis×E.urophylla(CK)plantations,mixed plantations of E.grandis×Machiluspauhoi(T1)and mixed plantations of E.grandis×Castanopsishystrix(T2)were analyzed to provide scientific insights for management of mixed species plantations involving eucalypts.The results showed that growth of M.pauhoi and C.hystrix were good when in mixed plantations with eucalypts.Tree height,DBH,individual tree volume and stand volume of E.grandis×E.urophylla in mixed plantations were significantly higher than those in pure plantations of the same eucalypt species,but there were no significant differences between the two types of mixed plantations.Species found represented in the understory layers included 24 species of 23 genera in 17 families,25 species of 24 genera in 18 families and 29 species of 28 genera in 23 families in CK,T1 and T2,respectively.The species richness(S),Shannon-wiener index(H)and community evenness(J)in shrub layers of the understory were higher than those in the herbaceous layers of the understory,with more Rubiaceae and Verbena plants found in the shrub layer while more Poaceae and Pteridophyta were found in the herbaceous layers.Combined with the index of stand growth and understory plant diversity,T2 could be used as a reference pattern for management of mixed species eucalypt plantations in the future.

关 键 词：巨尾桉 混交模式 生长特性 植物多样性 

分 类 号：S725.2[农业科学—林木遗传育种]