Rhododendron maximum impacts seed bank composition and richness following Tsuga canadensis loss in riparian forests
Rhododendron maximum impacts seed bank composition and richness following Tsuga canadensis loss in riparian forests
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河岸森林中加拿大铁杉消失后，杜鹃花对种子库组成和丰富度的影响最大
DOI：
10.1002/ecs2.2204
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发表时间：
2018
期刊：
影响因子：
2.7
通讯作者：
Miniat, Chelcy F.
中科院分区：
文献类型：
--
作者：
Cofer, Tristan M.;Elliott, Katherine J.;Bush, Janis K.;Miniat, Chelcy F.
南阿巴拉契亚河岸森林的组成和功能已经经历了入侵病原体和害虫的变化。20世纪30年代栗疫病（栗疫病）和铁杉（铁杉球蚜）在21世纪初的死亡导致了大杜鹃（一种万年青亚冠层灌木）的扩张和增长。更好地了解种子库的特征和影响种子库的各种非生物和生物因素可能有助于确定入侵相关干扰后森林群落的恢复潜力。我们比较了两种落叶林类型的种子库：有浓密的大冷杉亚冠层的阔叶林（以下简称RR）和没有大冷杉的阔叶林（以下简称HWD）。我们评估了许多微环境变量，通过主成分分析（PCA）和相关的PCA轴得分种子库密度和丰富度的森林类型。我们发现，种子库密度之间的森林类型是可比的，但是，种子库丰富度是低得多的RR比HWD和物种组成是不同的森林类型之间。HWD种子库中的64个物种中有28个（44%）在RR种子库中未发现。在这两种森林类型的代表物种往往发现在对比密度。最值得注意的是，几个木本物种的种子库密度是相当高的RR（85%）比HWD（45%），而草本种子库密度是较低的RR（11%）比HWD（50%）。矿质土壤pH值，土壤养分有效性，土壤水分较低，有机土壤（Oi + Oe + Oa）的深度和质量比HWD森林类型的RR更大。PCA相关分析表明，PCA4（以林下密度、Oe + Oa、磷和碳氮比表示）与种子库总密度呈负相关。PCA1（由Oe + Oa阳离子和磷、林下植物丰富度、地表覆盖物和矿质土壤pH值表示）和PCA4与总种子库丰富度呈正相关。这些结果表明，如果RR存在，土壤种子库将不是建立多样化和草本丰富的社区的主要补充模式。
Southern Appalachian riparian forests have undergone changes in composition and function from invasive pathogens and pests.Castanea dentatamortality in the 1930s from chestnut blight (Cryphonectria parasitica) andTsuga canadensismortality in the 2000s from the hemlock woolly adelgid (Adelges tsugae) have led to the expansion and increased growth ofRhododendron maximum, an evergreen subcanopy shrub. A better understanding of seed bank characteristics and the various abiotic and biotic factors that affect the seed bank may be useful in determining the restoration potential of forest communities following invasion‐related disturbances. We compared the seed bank of two deciduous forest types: hardwood forests with a denseR. maximumsubcanopy (hereafter, RR) and hardwood forests withoutR. maximum(hereafter, HWD). We evaluated numerous microenvironmental variables through principal component analysis (PCA) and correlated the derived PCA axes scores to seed bank density and richness across forest types. We found that seed bank density was comparable between the forests types; however, seed bank richness was much lower in RR than HWD and the species composition was dissimilar between forest types. Twenty‐eight of 64 (44%) species in the seed bank of HWD were not found in the seed bank of RR. Species that were represented in both forest types were often found in contrasting densities. Most notably, seed bank densities of several woody species were considerably higher in RR (85%) than HWD (45%), while herbaceous seed bank density was lower in RR (11%) than HWD (50%). Mineral soil pH, soil nutrient availability, and soil moisture were lower, and organic soil (Oi + Oe + Oa) depth and mass were greater in the RR than HWD forest type. PCA correlations revealed that PCA4 (represented by understory density and Oe + Oa phosphorus and carbon/nitrogen ratio) was negatively correlated with total seed bank density. PCA1 (represented by Oe + Oa cations and phosphorus, understory richness, ground‐layer cover, and mineral soil pH) and PCA4 were positively correlated with total seed bank richness. These results suggest that the soil seed bank will not be the primary mode of recruitment to establish a diverse and herbaceous‐rich community if a RR is present.
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砍伐南阿巴拉契亚流域 20 年后的地上生物量和养分积累
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
K. Elliott;L. Boring;W. Swank
通讯作者：
W. Swank
不同草本植被和土壤类型的成熟山毛榉林中埋藏的发芽种子
DOI：
--
发表时间：
1987
期刊：
影响因子：
--
作者：
H. Staaf;M. Jónsson;L. Olsen
通讯作者：
L. Olsen
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
O. W. Heal;R. A. Smith
通讯作者：
R. A. Smith
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
Sara Leckie;M. Vellend;G. Bell;M. J. Waterway;M. Lechowicz
通讯作者：
M. Lechowicz
影响因子：
--
作者：
C. Monk;D. T. McGinty;Frank P. Day join
通讯作者：
C. Monk;D. T. McGinty;Frank P. Day join