Pollen movement under alternative silvicultural practices in native populations of Scots pine (Pinus sylvestris L.) in central Spain
Pollen movement under alternative silvicultural practices in native populations of Scots pine (Pinus sylvestris L.) in central Spain
复制标题
西班牙中部樟子松 (Pinus sylvestris L.) 本土种群替代造林实践下的花粉运动
DOI：
10.1016/j.foreco.2004.05.016
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发表时间：
2004
影响因子：
3.7
通讯作者：
R. Alía
中科院分区：
文献类型：
--
作者：
J. J. Robledo;P. Smouse;L. Gil;R. Alía
随着养护遗传学被纳入多用途森林管理，有关造林的遗传效应的问题出现了。谨慎的采伐制度，利用自然再生，可以在保护区和采伐区保护具有商业重要性的物种的遗传资源。研究了4种樟子松（PinussylvestrisL.）天然更新方法（防护林和组择伐）对樟子松花粉运动和交配系统的影响。位于西班牙中部的瓜达拉马链用TwoGener分析法估计平均授粉距离为17- 22 m，有效花粉供体数相对较大（Nep>70）。我们发现了一个非显着的趋势，增加授粉距离和更大的有效数量的花粉供体，切割后。考虑到我们研究的林分的高同种密度（80-315棵树/公顷），花粉传播估计似乎与其他研究的值一致，使用其他方法。交配系统分析，使用MLTR混合交配模型，显示高异交率为所有四个立场（tm=0.93-0.99），但没有显示出显着的影响，林分间伐，虽然略有增加的异交率和近亲交配的表观比率（tm-ts）发生，随后削减。结果表明，苏格兰松的授粉系统是有弹性的，足以排除自然更新切割的负面影响。从授粉的角度来看，正常的苏格兰松造林系统似乎与西班牙中部的遗传保护目的兼容。
As conservation genetics is integrated into multipurpose forest management, questions regarding the genetic effects of silviculture arise. Careful harvesting regimes, using natural regeneration, could preserve genetic resources within commercially important species, both in reserves and in logged areas. We investigated the effects of two natural regeneration methods, shelterwood and group selection cutting, on subsequent pollen movement and mating system in four native stands of monospecific Scots pine (Pinus sylvestris L.) in the Guadarrama Chain of central Spain. Using TwoGener analysis, we estimated an average pollination distance of 17–22m and a relatively large effective number of pollen donors (Nep>70). We found a non-significant trend toward increasing pollination distance and larger effective number of pollen donors, subsequent to cutting. Considering the high conspecific density of the stands we studied (80–315 trees/ha), pollen dispersal estimates seem consistent with values from other studies, using other methods. Mating system analysis, using the MLTR mixed-mating model, showed high outcrossing rates for all four stands (tm=0.93–0.99), but failed to show significant effects of stand thinning, although slight increases of the outcrossing rate and the apparent rate of consanguineous mating (tm–ts) occurred, subsequent to cutting. Results suggest that the pollination system of Scots pine is resilient enough to preclude a negative impact of natural regeneration cutting. From the pollination point of view, normal Scots pine silvicultural systems seem compatible with genetic conservation purposes in central Spain.