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Architecture of remnant trees influences native woody plant recruitment in abandoned Hawaiian pastures
Plant Ecology ( IF 1.9 ) Pub Date : 2020-08-14 , DOI: 10.1007/s11258-020-01072-7
Evan M. Rehm , Stephanie G. Yelenik , Marley Puanani Smith , Carla M. D’Antonio

Abandoned tropical pastures offer opportunities for passive and active restoration of native forest communities. Tree architecture of remnant canopy trees may be one important factor that can facilitate native plant recruitment in abandoned pastures but has largely been overlooked. Here, we evaluated patterns of native woody plant recruitment under remnant trees in abandoned pastures on Hawai’i Island and how these might be related to both tree architectural features and landscape variables. We measured native woody stems (excluding sprouts of the tree itself) in a 5 m radius around the base of each tree and modeled total basal area of native stems as a function of tree architectural characteristics. Recruitment was positively correlated with tree height as well as horizontal woody area below 1 m (tree structure that occurred below 1 m and was < 45° angle from the ground) around the base of trees. Tall trees likely attract more avian seed dispersers due to their higher visibility on the landscape and increased crown volume. Horizontal woody area likely provides establishment microsites that are above the pasture grass layer, similar to how dead or decaying logs act as nurse substrates. Unlike previous studies, we found little evidence that landscape variables such as distance to the intact forest or nearest canopy neighbor influenced understory recruitment. Tree architectural characteristics can be important predictors of native plant recruitment in abandoned tropical pastures and should be considered in addition to local and landscape-level variables.



中文翻译:

残余树木的建筑影响废弃的夏威夷草场中原生木本植物的吸收

被遗弃的热带牧场为被动和主动恢复原生森林群落提供了机会。残留冠层树的树木结构可能是可以促进废弃草场招募原生植物的重要因素之一,但在很大程度上已被忽略。在这里,我们评估了夏威夷岛废弃牧场上残留树木下原生木本植物募集的模式,以及它们与树木的建筑特征和景观变量之间的关系。我们在每棵树的根部周围5 m半径范围内测量了天然木本茎(不包括树木本身的新芽),并根据树的建筑特征对本底茎的总基础面积进行了建模。招聘人数与树高以及1 m以下的水平木区面积呈正相关(发生在1 m以下且< 与地面成45度角)。高大的树木因其在景观中的可见度较高和树冠体积增加而可能吸引更多的鸟类种子传播者。水平的木质区域可能会提供位于牧场草层上方的场所微型场所,类似于枯木或腐烂的原木如何作为护理基质。与以前的研究不同,我们几乎没有发现证据表明景观变量(例如到完整森林的距离或最近的树冠邻居)会影响地下植被的吸收。树木的建筑特性可能是废弃热带牧场中本地植物招募的重要预测指标,除局部和景观水平变量外,还应考虑树木的特性。高大的树木因其在景观中的可见度较高和树冠体积增加而可能吸引更多的鸟类种子传播者。水平的木质区域可能会提供位于牧场草层上方的场所微型场所,类似于枯木或腐烂的原木如何作为护理基质。与以前的研究不同,我们发现很少有证据表明景观变量(例如到完整森林的距离或最近的树冠邻居)会影响地下植被的吸收。树木的建筑特性可能是废弃热带牧场中本地植物招募的重要预测指标,除局部和景观水平变量外,还应考虑树木的特性。高大的树木因其在景观中的可见度较高和树冠体积增加而可能吸引更多的鸟类种子传播者。水平的木质区域可能会提供位于牧场草层上方的微型场所,类似于枯木或腐烂的原木如何作为护理基质。与以前的研究不同,我们发现很少有证据表明景观变量(例如到完整森林的距离或最近的树冠邻居)会影响地下植被的吸收。树木的建筑特征可能是废弃热带牧场中本地植物招募的重要预测指标,除局部和景观水平变量外,还应考虑树木的特征。类似于死木或腐烂的原木如何作为护理基质。与以前的研究不同,我们几乎没有发现证据表明景观变量(例如到完整森林的距离或最近的树冠邻居)会影响地下植被的吸收。树木的建筑特征可能是废弃热带牧场中本地植物招募的重要预测指标,除局部和景观水平变量外,还应考虑树木的特征。类似于死木或腐烂的原木如何作为护理基质。与以前的研究不同,我们发现很少有证据表明景观变量(例如到完整森林的距离或最近的树冠邻居)会影响地下植被的吸收。树木的建筑特性可能是废弃热带牧场中本地植物招募的重要预测指标,除局部和景观水平变量外,还应考虑树木的特性。

更新日期:2020-08-14
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