Spatial variation in ditch bank plant species composition at the regional level: the role of environment and dispersal
Spatial variation in ditch bank plant species composition at the regional level: the role of environment and dispersal
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DOI：
10.1111/j.1654-1103.2010.01190.x
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发表时间：
2010-10
影响因子：
2.8
通讯作者：
X. Leng;C. Musters;G. D. Snoo
中科院分区：
文献类型：
--
作者：
X. Leng;C. Musters;G. D. Snoo
问题：可以解释的环境和扩散因素，如果是这样的话，在多大程度上的物种相似性模式沟银行？距离衰减的模式是否在不同的物种组（所有物种与保护利益的目标物种;不同传播类型的物种）之间有所不同？地点：Krimpenerwaard，荷兰。方法：2006-2007年，对72个样地的130种陆生草本植物进行了沟岸植被调查。物种的相似性进行了测量和相关的环境距离（土壤类型和营养水平）和扩散距离（地理距离和水，风和农业活动的扩散限制）作为解释因素，使用多元回归距离矩阵（MRM）。使用随机化检验研究了不同数据子集（物种组）之间物种相似性的距离衰减率差异。结果如下：在所有物种中，组成的相似性模式主要受扩散变化的影响，而对于目标物种，这些是由于环境和扩散变化的综合影响。与其他扩散机制的物种相比，水分散物种的距离衰减率只有一半。结论：对于这里考虑的所有物种，扩散限制似乎比环境决定论更负责物种组成的空间变异。以植物物种多样性为重点的养护管理在那些已经实行类似管理制度的地区的邻近地区会更成功。对于具有保护价值的目标物种，除了扩散限制外，营养水平等环境决定因素也很重要。因此，作为保护这些目标物种的一种手段，注重降低营养水平和促进物种扩散将比目前的管理做法更有效，目前的管理做法主要侧重于减少肥料投入。
Questions: Can patterns of species similarity on ditch banks be explained by environmental and dispersal factors and, if so, to what extent? Does the pattern of distance decay differ among different species groups (all species versus target species of conservation interest; species of different dispersal type)? Location: Krimpenerwaard, the Netherlands. Methods: In 2006-2007, ditch bank vegetation data on 130 terrestrial herbaceous species were collected on 72 plots. Species similarity was measured and related to environmental distance (soil type and nutrient level) and dispersal distance (geographic distance and limitation of dispersal by water, wind and agricultural activities) as explanatory factors using multiple regression on distance matrices (MRM). Differences in rates of distance decay in species similarity among different subsets of data (species groups) were investigated using randomization tests. Results: In all species, patterns of similarity of composition are influenced mainly by variations in dispersal, while for target species these are due to combined effects of environmental and dispersal variation. Compared with species using other dispersal mechanisms, water-dispersed species had half the rate of distance decay. Conclusions: For all species considered here, dispersal limitation seems more responsible for the spatial variation in species composition than environmental determinism. Conservation management focused on plant species diversity would be more successful in areas adjacent to those where a similar management regime is already in force. For target species of conservation interest, besides dispersal limitation, environmental determinants like nutrient level are also important. As a means of conserving such target species, therefore, focusing on reducing nutrient levels and facilitating species dispersal will be more effective than current management practices, which mainly focus on reducing fertilizer inputs.