Effects of defoliation and girdling on fruit production in Ilex aquifolium
Effects of defoliation and girdling on fruit production in Ilex aquifolium
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DOI：
10.1046/j.1365-2435.1998.00216.x
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发表时间：
1998-06-01
影响因子：
5.2
通讯作者：
Obeso, JR
中科院分区：
文献类型：
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作者：
Obeso, JR
1.在西班牙北方的一个种群中研究了去叶和环剥对欧洲冬青冬青果实产量的影响。在10棵树的分支水平上进行了3种落叶处理（对照、50%和100%落叶）。每个处理在每棵树中使用六个分支，并且这些分支的一半被环剥（从分支基部去除树皮和形成层的环）。从无环剥枝条上去除叶片对坐果率、果实产量和分支水平上的生殖分配影响不大。然而，这些变量降低的程度，减少了去叶的环剥枝。无叶枝的果实产量在带箍枝和无箍枝之间没有差异，表明带箍枝在未受损时具有自主果实产量。环剥100%落叶枝条的平均果实质量为对照枝条的8%。果实生产的ungirdled-100%落叶分支没有不同的控制分支，显示从其他分支的资源输入的重要性。因此，对于果实的生产，枝可以被看作是仅仅部分自主的。环剥50%落叶枝条的果实产量是对照枝条的42%，而不环剥50%落叶枝条的果实产量是对照的70%。这些结果也证明了资源输入，但不支持光合补偿机制的存在.结果枝所发展的资源输入能力可能是减少该物种生殖成本效应的一种机制。
1. The effects of defoliation and girdling on fruit production in European holly Ilex aquifolium were studied in a northern Spanish population. Three defoliation treatments (control, 50% and 100% leaf removal) were applied at branch level in 10 trees. Six branches were used per treatment in each tree and half of these branches were girdled (a ring of bark and cambium was removed from the branch base).2. Leaf removal from ungirdled branches had little effect on fruit set, fruit production and reproductive allocation at branch level. However, these variables decreased as the extent of defoliation increased on girdled branches.3. Fruit production in undefoliated branches did not differ between girdled and ungirdled branches, showing that girdled branches were autonomous for fruit production when undamaged. Mean fruit mass of girdled-100% defoliated branches averaged 8% of fruit mass produced by control branches.4. Fruit production of ungirdled-100% defoliated branches did not differ from control branches, showing the importance of resource importation from other branches. Hence the branches may be regarded as only partially autonomous for fruit production.5. Fruit production of girdled-50% defoliated branches was 42% of fruit production of control branches, while ungirdled-50% defoliated branches amounted to 70% of controls. These results also demonstrated resource importation but did not support the existence of photosynthetic compensatory mechanisms.6. The ability of resource importation developed by fruiting branches might be a mechanism to reduce the effect of reproductive costs in this species.