Herbaceous Understory Indicators of Post-Harvest Recovery in Coast Redwood (Sequoia sempervirens) Forests

W. Russell
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引用次数: 5

Abstract

Assessment of forest recovery following disturbance is enhanced by the use of biological indicators. One such indicator, the abundance of understory species, was examined in coast redwood (Sequoia sempervirens) forests using non-metric multiple dimensional scaling (NMDS) and indicator species analysis (ISA). Randomly distributed 10 m diameter circular plots were employed to record the abundance of all understory species across three treatments: actively managed (0 - 45 years since harvest); mature second-growth (~80 - 120 years since harvest); and unharvested old-growth stands. NMDS with perMANOVA analysis signified separation between treatments with the shade tolerant herbaceous species Trillium ovatum, Viola sempervirens, and Oxalis oregana positively correlated with mature second-growth and old-growth treatments. ISA supported the inclusion of T. ovatum, with the addition of Prosartes hookerii, as indicators of mature second-growth and old-growth. Both NMDS and ISA specified associations for Ceanothus thyrsiflorus and Stachys bullata with actively-managed stands. Occurrence of non-natives was low across treatments, though significantly higher on actively managed stands, with the shade intolerant invasive plants, Cortaderia sp. and Myosotis latifolia, occurring exclusively in actively-managed sites.
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海岸红杉林采后恢复的草本底层指标
利用生物指标加强了对扰动后森林恢复情况的评估。使用非度量多维尺度(NMDS)和指示物种分析(ISA)对海岸红杉(Sequoia semperverrens)森林中的林下物种丰度进行了研究。随机分布的直径为10m的圆形地块用于记录三个处理中所有林下物种的丰度:积极管理(收获后0-45年);成熟的第二次生长(收获后约80-120年);未得到保护的旧增长依然存在。NMDS和perMANOVA分析表明,耐荫草本植物延龄草、紫百合和牛膝处理之间的分离与成熟的二次生长和老生长处理呈正相关。ISA支持将T.ovatum加入,并添加Prosartes hookerii,作为成熟二次生长和老生长的指标。NMDS和ISA都指定了具有积极管理林分的尖尾海螺和大眼海螺的关联。不同处理的非本地植物发生率较低,但在积极管理的林分中明显较高,不耐荫的入侵植物Cortaderia sp.和Myosotis latifolia仅发生在积极管理区。
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