Dynamic oak-scrub to forest succession: Effects of management on understorey vegetation, humus forms and soils
Dynamic oak-scrub to forest succession: Effects of management on understorey vegetation, humus forms and soils
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DOI：
10.1016/j.foreco.2005.02.051
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发表时间：
2005-06
影响因子：
3.7
通讯作者：
B. Strandberg;S. Kristiansen;K. Tybirk
中科院分区：
文献类型：
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作者：
B. Strandberg;S. Kristiansen;K. Tybirk
为保护受保护的生态系统而进行的积极管理正受到越来越多的关注，因为管理可能是林下植被时空分布的最重要因素，也可能是腐殖质形态和土壤养分循环的最重要因素。本研究探讨了这个问题上排水良好的桑迪土壤中的古老的林地的哈尔德埃格，丹麦，这是在1915年保存。从那时起，四种类型的管理继续进行：（一）管理，纯橡木，（二）非管理，山毛榉-橡木，（三）放牧橡木和（四）矮林橡树林。数据包括两个独立的现代数据集，来自所有类型的管理，以及1916年和现在的数据之间的比较。森林类型和可能的解释变量之间的关系，如土地利用历史和森林，腐殖质层，土壤和林下植物的特性，使用主成分（PCA）和对应（DCA）分析进行了研究。结果表明，放牧哺乳动物保持橡树林在一个类似的状态保存前阶段的植被和腐殖质的形式。在这里，在整个生长季节的森林地面的光渗透支持一个不同的植物群和一个moder或mull型的分解。相反，非管理的地块成功地成为一个黑暗的山毛榉栎林厚的腐殖质层和林下物种数量急剧减少。因此，目前的分析支持的理论，管理是必要的，以保护橡树灌丛和开放的林地从草本森林植被，腐殖质的形式和林下植被的演替变化。
Active management for preservation of conserved ecosystems is receiving increased attention, as management probably is the most important factor for the temporal and spatial distribution of understorey vegetation, and probably humus forms and soil nutrient cycling as well. The present study investigates this issue on well-drained sandy soils in the ancient woodlands of Hald Ege, Denmark, which was preserved in 1915. Four types of management have continued since then: (i) managed, pure oak, (ii) non-managed, beech-oak, (iii) grazed oak and (iv) coppiced oak stands. Data consisted of two independent present-day data sets from all types of management, and one comparison between data from 1916 and now. Relations between forest type and possible explanatory variables, such as land-use history and characteristics of forest, humus layer, soil and understorey, were studied using principal component (PCA) and correspondence (DCA) analyses. Results showed that grazing mammals have kept the oak forest in a state resembling the pre-preservation stage with respect to both vegetation and humus forms. Here, light penetration to the forest floor during the entire growing season supported a diverse flora and a moder or mull-type of decomposition. The non-managed plots were in contrast succeeded into a dark beech-oak forest with thick humus layers and a drastic decrease in understorey species number. The present analysis hence supports the theory that management is necessary to conserve oak-scrubs and open woodlands from successional changes of herbaceous forest vegetation, humus forms and understorey vegetation.