【作者】 温远光； 朱宏光； 梁宏温； 罗应华； 孙冬靖； 黄学勇；

【Author】 Wen Yuanguang,Zhu Hongguang,Liang Hongwen,Luo Yinghua,Sun Dongjing,Huang Xueyong(Forestry College,Guangxi University,Nanning,530005,P.R.China)

【机构】 广西大学林学院；

【摘要】 对广西东门林场不同连栽代数桉树人工林的植物多样性开展研究,旨在阐明桉树多代连栽对植物多样性和植物功能群的影响。通过一个经营周期(7年)的试验研究表明,不同连栽代数植被覆盖度与植物多样性的关系不同。第一代林(FRF)的物种丰富度(S)与林冠层覆盖度(CC)和林下灌木层覆盖度(SLC)呈紧密的正相关(P<0.05,n=18),而第二代林(SRF)和第三代林(TRF)则表现为紧密的负相关(P<0.05,n=18)。连栽不仅降低林下植物的物种多样性,还将改变植物的功能群组成;SRF和TRF的物种丰富度分别比FRF减少31%和18%,但SRF反而比TRF减少18%,表明干扰历史对林下植物的物种丰富度影响很大;连栽会降低乔木和藤本植物营养体和种子库的有效性,增强草本植物的有效性;桉树短周期多代连栽不利于人工林生态过程和功能的维持。更多还原

【Abstract】 By studying on plant species diversity and functional types of among multi-successive rotations in eucalypt plantations in Dongmen Forest Farm of Guangxi province,the objective was to examine and illustrate the effects of multi-successive rotations in eucalypt plantations on plant species diversity and functional types.The results show that the relationship between vegetation cover with plant species diversity was different among different successive rotations of eucalypt plantations.The species richness was significant positive for canopy cover(CC) and shrub layer cover(SLC) of undersoty vegetation in first rotation stands(FRF)(P<0.05,n=18),but was significant negative in second rotation stands(SRF) and third rotation stands(TRF) of eucalypt plantations(P<0.05,n=18).Successive rotations of eucalypt plantation seem to reduce not only species diversity,but also change composition of plant functional types.The species richness of SRF and TRF of eucalypt plantations were reduced by 31% and 18%,respectively,compared with the FRF.However,the species richness of SRF was less 18% than that of TRF.These implied that the species diversity of understory vegetation would be strongly influenced by disturbance history of eucalypt plantation.The successive short-rotation of eucalypt plantation decrease propagule availability of tall tree and vine species,but increase herbs.These results suggest that differences in successive rotations cause various responses according to species type and affect the ecological process of seed dispersal,and are unfavorable to the maintenance of ecological processes and function.更多还原