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首页> 外文期刊>Ecological Applications >Moss harvest truncates the successional development of epiphytic bryophytes in the Pacific Northwest
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Moss harvest truncates the successional development of epiphytic bryophytes in the Pacific Northwest

机译：苔藓丰收截断了西北太平洋附生苔藓植物的连续发展

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摘要

We evaluated the impact of commercial moss harvest on the development of an understory epiphyte community in the Pacific Northwest by characterizing natural development stages using data from both a long-term regrowth study and demographic sampling. First, experimentally stripped I in long cylindrats on 46 shrub stems in the Oregon Coast Range were monitored for species composition and abundance annually during the first five years of recovery and again in year 10. Second, a pathway of community development was inferred by examining the relative species composition and abundance of epiphytic species present in moss mats in a four-stage chronosequence; We (1) characterized the change in richness and composition from year 1 through 10 of regrowth following experimental disturbance, (2) quantified the proportion of similar to 1-, 10-, 25-, and 50-year-old moss mats of commercially harvestable species that were monodominant, diverse, and late successional, and (3) contrasted these proportions with estimates from a compositional transition matrix derived from long-term monitoring. Roughly half of the observed moss mats demonstrated neutral dynamics and were composed of a mixture of readily dispersed acrocarps and pleurocarps. The remaining half exhibited positive dynamics and were dominated by aggressively growing pleurocarpous species such as Isothecium myosuroides. Following structural developmental pathways well established for vascular plants, moss mats shift with time from high diversity and evenness in the initial colonization and extended establishment phases to increasing Isothecium dominance during a presumed competitive-exclusion phase. Old mats exist in alternate states of either Isothecium dominance or mixed composition, either of which may have late-successional species. Patchy historic commercial moss harvest likely facilitated high diversity by increasing the simultaneous occurrence of all moss mat age classes, while modern strip harvesting methods are predicted to promote predominantly even-aged mats that are unlikely to reach "old-growth" conditions before re-harvest.
机译：我们通过使用长期再生研究和人口抽样数据来表征自然发展阶段，从而评估了商业性青苔捕捞对西北太平洋地下附生植物群落发展的影响。首先，在恢复的头五年和第10年，每年对俄勒冈州海岸山脉46个灌木茎上长圆筒形的实验性I进行监测，以监测物种组成和丰度，其次在第10年进行监测。在四个阶段的时间序列中，苔藓垫中存在的相对物种组成和附生物种的丰度;我们（1）表征了实验扰动后1至10年再生长后丰富度和组成的变化，（2）量化了与1、10、25和50岁的商用苔藓垫相似的比例（3）将这些比例与长期监测得出的成分过渡矩阵的估计值进行了对比，得出了可支配的物种，这些物种具有单一优势，多样性和后期演替特征。观察到的苔藓垫大约有一半表现出中性的动力学，由易分散的杂果和胸果的混合物组成。其余的一半表现出积极的动力，并以积极生长的胸果肉物种（如异肉异毛球菌等）为主导。在维管植物建立了良好的结构发育途径之后，苔藓垫随着时间的推移，从最初的定居和扩展建立阶段的高度多样性和均匀性转移到假定的竞争排斥阶段中等轮虫占主导地位。旧席子存在等位基因占主导地位或混合组成的交替状态，这两种状态都可能具有后期成功种。斑驳的历史性商业性苔藓收获可能会通过增加所有苔藓垫年龄类别的同时发生而促进高度多样性，而现代的条带收获方法预计将促进主要是均匀年龄的垫子，这些垫子在重新收获之前不太可能达到“老龄”条件。

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