克隆整合在糙花箭竹补偿更新中的作用  

The Effect of Clonal Integration on the Compensatory Growth of Fargesia scabrida

作　　者：魏宇航[1,2] 肖雷[3] 陈劲松[1] 李娇[1,2] 陈万里[4] 马博[4] 刘庆[1] 

机构地区：[1]中国科学院成都生物研究所生态恢复重点实验室,成都610041 [2]中国科学院大学,北京100049 [3]四川理工学院,四川自贡643000 [4]唐家河国家级自然保护区,四川青川628109

出　　处：《重庆师范大学学报（自然科学版）》2013年第4期148-154,共7页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金(No.31170502)

摘　　要：克隆整合是克隆植物在遭受采食干扰后特有的补偿生长机制。糙花箭竹(Fargesia scabrida Yi)是大熊猫主食竹的一种,为研究克隆整合在该物种分株种群补偿更新中的作用,设置了不剪除和剪除25%、50%、75%等4种模拟采食强度的糙花箭竹样方,并对样方四周根状茎进行了切断、不切断处理。实验结果表明:1)切断根状茎连接使得出笋提前,并且出笋受切断根状茎和剪除强度的交互作用影响。2)除根状茎连接时剪除25%处理后补充率显著低于不剪除样方外,不论根状茎连接还是切断,糙花箭竹均能通过补偿生长消除剪除25%和50%的负面影响。剪除75%处理后,切断根状茎连接时出笋率和补充率显著高于不剪除样方,根状茎连接时恰好相反;新生分株的株高、基径和单株生物量不论根状茎连接还是切断均显著低于不剪除样方。3)与保持根状茎连接时相比,切断根状茎连接降低了不剪除样方的出笋率、补充率和新生分株的生长,但增加了剪除75%处理下的出笋率和补充率。因此,糙花箭竹能够通过补偿生长耐受25%和50%强度的采食干扰,75%强度的采食干扰显著降低了新生分株的生长能力以及根状茎连接时的出笋率和补充率,但刺激了切断根状茎后的出笋。研究提示克隆整合对糙花箭竹新生笋的萌发和生长具有重要的支持作用,但并不是补偿生长过程中主要的补偿机制。Clonal integration is a unique compensatory mechanism of clonal plants.Fargesia scabrida Yi is a kind of staple food bamboos for the giant panda.To investigate the effect of clonal integration on the compensatory growth of F.scabrida,we conducted an experiment with plots were treated in four clipping intensities（25%,50%,75% and control） and rhizomes along the plots were severed or not.The results showed that： 1） the new shoots came out earlier in plots with rhizomes severed than the connected ones.The shooting of F.scabrida was affected by the interaction of rhizomes severing and clipping intensities.2） Except the recruitment of plots with 25% clipped and rhizomes connected decreased compare to no clipping plots,F.scabrida can completely eliminate the negative effects of 25% and 50% clipping through compensatory grow,despite whether rhizomes connected or not.In a contrast with no clipping plots,75% clipping significantly increased the shooting rare and recruitment of plots with rhizomes severed,but had a completely opposite effect on the connected plots;the height,basal diameter and biomass per ramet of the new shoots were significantly diminished in both severed and connected plots.3） Compared to rhizomes connected plots,the shooting rate,recruitment and the growth of the new shoots showed remarkable decreases in no clipping plots with rhizomes severed.Instead,the shooting rate and recruitment increased after severed rhizomes of plots under 75% clipping intensity.Through regrowth,25%and 50% clipping intensities did not affect the regeneration of F.scabrida.75% clipping showed an obviously negative effect on the growth of new shoots,but stimulated shooting and recruitment ability when rhizomes severed.Clonal integration is important in the germination and growth of new shoots,but it isn＇t the main compensatory mechanism of F.scabrida.

关 键 词：克隆整合 补偿生长 大熊猫主食竹 种群更新 分株种群 

分 类 号：Q948.12[生物学—植物学]