Effects of leaf litter on the growth of boreal feather mosses: Implication for forest floor development
Effects of leaf litter on the growth of boreal feather mosses: Implication for forest floor development
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DOI：
10.3170/2008-8-18367
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发表时间：
2008-04-01
影响因子：
2.8
通讯作者：
Landhausser, Simon M.
中科院分区：
文献类型：
--
作者：
Startsev, Natalia;Lieffers, Victor J.;Landhausser, Simon M.
问：落叶对羽藓的生长和死亡有什么影响？进行了三个实验，以隔离遮光效果的影响，从羽毛苔藓的死亡率和growth.Location：埃德蒙顿，阿尔伯塔和北部针叶林，中西部阿尔伯塔，加拿大。方法：在田间试验中，杨树（白杨）落叶被施加到床的羽毛苔藓占主导地位的Hyaciumsplendens。处理是用网固定一层叶子;一层粗糙研磨的叶子，撒在苔藓层上;相当于一层叶子的遮光布;和对照。通过两个生长箱试验，研究了山松和扭叶松凋落物水提液的施用以及遮荫和可溶性碳水化合物对紫萼藓生长和死亡的影响。白杨落叶的水提取物的应用导致几乎所有的Ptilium芽衰老或死亡相比，没有效果的控制或类似的松针落叶提取物。从白杨凋落物提取物有更大的酚类化合物和可溶性糖的浓度比松树提取物。此外，糖Ptilium允许它的增长和积累碳水化合物，即使在低光照conditions.Conclusions：结果表明，阔叶落叶乔木物种可以限制羽藓类通过他们的落叶的生长，并暗示影响腐殖质的形式，养分循环，和这些森林的林下植物组成。
Question: What is the effect of leaf litter on growth and mortality of feather mosses. Three experiments were conducted to isolate the shading effect from the effect of leaching of soluble compounds from the leaf litter effect on feather moss mortality and growth.Location: Edmonton, Alberta and the northern boreal coniferous forest, west-central Alberta, Canada.Methods: In a field experiment Populus tremuloides ( aspen) leaf litter was applied to beds of feather mosses dominated by Hylocomium splendens. Treatments were one layer of leaves held in place with netting; one layer of leaves coarsely ground, sprinkled over the moss layer; a shade cloth equivalent to one layer of leaves; and a control. In two growth chamber experiments, the application of aqueous extracts of P. tremuloides and Pinus contorta leaf litter and the effect of shade and soluble carbohydrates were tested on the growth and mortality of Ptilium crista-castrensis.Results: Mortality of Hylocomium was greatest under the intact leaves, followed by the treatments using shade cloth and ground leaves and finally the control. The application of aqueous extracts of aspen leaf litter resulted in senescence or death of nearly all Ptilium shoots compared to no effects for the control or for similar extracts of pine needle litter. Extracts from aspen litter had greater concentrations of phenolic compounds and soluble sugars than pine extracts. Addition of sugars to Ptilium allowed it to grow and accumulate carbohydrates, even in low light conditions.Conclusions: Results suggest that broad-leaved deciduous overstory species can limit the growth of feather mosses through their leaf litter and by implication affect the humus form, nutrient cycling, and understory composition of these forests.