Long-term response of understory plant species to thinning and fertilization in a Douglas-fir plantation on southern Vancouver Island, British Columbia
Long-term response of understory plant species to thinning and fertilization in a Douglas-fir plantation on southern Vancouver Island, British Columbia
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DOI：
10.1139/cjfr-30-4-566
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发表时间：
2000-04-01
影响因子：
2.2
通讯作者：
Barclay, HJ
中科院分区：
文献类型：
--
作者：
He, FL;Barclay, HJ
研究了51年生花旗松（Pseudotsuga menziesii（Mirb.）在不列颠哥伦比亚省温哥华岛南部的肖尼根湖进行了造林试验，研究了不同间伐和施氮处理对林分生长的影响。试验采用两因素析因设计，间伐和施氮各设3个水平。未检测到对维管或非维管物种数量的显著处理效应。这也适用于大多数林下物种的覆盖，除了salal（白珠）和俄勒冈州喙藓（Kindbergia oregana（Sull.）Ochyra）。重间伐导致高salal和俄勒冈州喙苔藓覆盖，而重施肥导致较低的salal覆盖，但没有影响的覆盖俄勒冈州喙苔藓。虽然间伐有边际效应的树冠树木的覆盖27年后治疗，树冠树木的覆盖只有最小的影响林下植被。相反，林下植被对冠层树木没有不利影响，这项研究表明，经过27年的间伐和施肥对林下植被的影响不大，无论是在物种丰富度或植被覆盖度。保护物种多样性的一个有效方法是保护特定的基质类型，例如，树干、树桩和粗糙的木质残体。建议在类似类型的森林中进行商业间伐，以减少树干排除时间。
The 27-year response of understory vegetation in a 51-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest to thinning and N fertilization treatments was examined in a silviculture experiment at Shawnigan Lake on southern Vancouver Island of British Columbia. The experiment was a two-way factorial design with three levels for each of thinning and N fertilization. No significant treatment effects on the number of either vascular or nonvascular species were detected. This was also true for the covers of the majority of understory species except salal (Gaultheria shallon Pursh) and Oregon beaked moss (Kindbergia oregana (Sull.) Ochyra). Heavy thinning led to high salal and Oregon beaked moss cover, whereas heavy fertilization resulted in lower cover of salal but had no effect on the cover of Oregon beaked moss. Although thinning had a marginal effect on the cover of canopy trees 27 years after treatment, the cover of the canopy trees had only minimal effects on understory vegetation. Conversely, no adverse effect of understory vegetation on canopy trees was found. This study suggested that after 27 years thinning and fertilization had little effect on understory vegetation whether in terms of species richness or vegetation cover. An effective way to conserve species diversity is to protect specific substrate types, e.g., tree trunks, stumps, and coarse woody debris. A commercial thinning was recommended to reduce the time of stem exclusion in similar type of forests.