Cattle grazing facilitates tree regeneration in a conifer forest with palatable bamboo understory
Cattle grazing facilitates tree regeneration in a conifer forest with palatable bamboo understory
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DOI：
10.1016/j.foreco.2007.06.018
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发表时间：
2007-11-30
影响因子：
3.7
通讯作者：
Gratzer, G.
中科院分区：
文献类型：
--
作者：
Darabant, A.;Rai, P. B.;Gratzer, G.
在温带针叶混交林在不丹喜马拉雅山，我们调查了牛放牧对针叶树（铁杉，松wallichiana，云杉，冷杉）幼苗密度，生长和微网站的招聘密集覆盖下的竹玉山，使用外壳在9年的一段时间后，组选择收获。随着时间的推移，增加竹的竞争，树冠开放成功地防止幼苗招聘未放牧地块，而招聘放牧地块是连续的。通过放牧减少竹高度促进招聘的所有树种，特别是T dumosa，主要是通过增加森林地面上的光拦截。树种组成的幼苗和overstory没有不同的未放牧的地块，而在放牧的地块，我们观察到T dumosa优势的转变。放牧样地中杜牧和刺苦木的生长速率高于未放牧样地。在放牧地块，招聘的T dumosa集中在苔藓，这可能会防止干燥的小种子发芽后的物种。我们建议，控制放牧可能会促进天然更新后，在不丹中部的针叶混交林采伐茂密的Y。小叶竹(c)2007 Elsevier B.V.保留所有权利。
In a temperate mixed conifer forest in the Bhutan Himalayas, we investigated the effects of cattle grazing on conifer (Tsuga dumosa, Pinus wallichiana, Picea spinulosa, Abies densa) seedling density, growth and microsite of recruitment under dense cover of the bamboo Yushania microphylla, using exclosures over a period of 9 years after group selection harvest. Increasing bamboo competition over time following canopy opening successfully prevented seedling recruitment in ungrazed plots, while recruitment in grazed plots was continuous. Reduction of bamboo height through grazing facilitated recruitment of all tree species, particularly T dumosa, mainly through increased light interception on the forest floor. Tree species composition of seedlings and the overstory did not differ in ungrazed plots, while in grazed plots we observed a shift towards dominance of T dumosa. Growth rates of T dumosa and P. spinulosa were higher in grazed plots as compared to ungrazed plots. In grazed plots, recruitment of T dumosa was concentrated on moss, which might have prevented desiccation of the small-seeded species after germination. We propose that controlled grazing might facilitate natural regeneration after logging in mixed conifer forests of central Bhutan with dense Y. microphylla bamboo understory. (c) 2007 Elsevier B.V. All rights reserved.