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Understorey removal effects on tree regeneration in temperate forests: A meta‐analysis
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2020-11-06 , DOI: 10.1111/1365-2664.13792 Emiel De Lombaerde 1 , Lander Baeten 1 , Kris Verheyen 1 , Michael P. Perring 1, 2, 3 , Shiyu Ma 4 , Dries Landuyt 1
中文翻译：
下层清除对温带森林树木更新的影响：荟萃分析
更新日期：2021-01-07
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2020-11-06 , DOI: 10.1111/1365-2664.13792 Emiel De Lombaerde 1 , Lander Baeten 1 , Kris Verheyen 1 , Michael P. Perring 1, 2, 3 , Shiyu Ma 4 , Dries Landuyt 1
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- The unwanted development of dense understorey vegetation composed of resource‐acquisitive, tall plant species competing strongly with tree regeneration can pose formidable problems for managers attempting to regenerate temperate forests. Despite many studies on the effects of understorey removal, no comprehensive review has summarised and quantified its effects on subsequent life stages of tree regeneration in temperate forests.
- We synthesised data from 32 experimental studies from temperate forest regions. We used meta‐analytic techniques to find general patterns in terms of the characteristics of the understorey, overstorey and characteristics of the regenerating tree species, which are most responsible for possible positive understorey removal effects on early life stages of tree regeneration, i.e. emergence, survival and growth.
- Both seedling survival and growth increased in response to understorey removal; emergence did not show a clear pattern. Seedlings growing free from competition mainly increased their biomass growth (total and above‐ground), whereas diameter and height growth responded less. These positive effects were largest when removing denser understorey vegetation and under more open overstorey conditions. Multiple management options influenced the regeneration responses to understorey removal. For instance, growth of older, planted seedlings responded less to removal, whereas protection against large browsers increased growth responses.
- Tree species with differing strategies responded differently to understorey removal. Growth and survival responses of early‐successional species responded more strongly to understorey removal than mid‐ or late‐successional tree species.
- Synthesis and applications. Our study showed that understorey removal can have strong positive effects on tree regeneration across temperate forest contexts. The magnitude of these effects depended on overstorey and understorey conditions, but also on the type of tree species that is regenerated. Our results can support forest managers in their decision‐making and help assess under what conditions understorey removal will be most justified.
中文翻译：
下层清除对温带森林树木更新的影响：荟萃分析
- 由资源获取型高大植物物种构成的，与树木再生强烈竞争的茂密的底层植被的不良发展，可能对试图恢复温带森林的管理者造成巨大的问题。尽管对下层清除的影响进行了许多研究，但尚无全面的综述来总结和量化其对温带森林树木再生后续生命阶段的影响。
- 我们综合了来自温带森林地区的32项实验研究的数据。我们使用了荟萃分析技术，根据下层，上层和可再生树种的特征找到了一般模式，这些模式对下层树再生的早期生命阶段（即出苗，存活）可能产生积极的下层去除作用负有最大责任。和成长。
- 幼苗的存活和生长均因底层去除而增加。出现并没有显示出清晰的模式。无竞争生长的幼苗主要增加了其生物量的增长（全部和地上），而直径和高度的增长反应较小。当清除较密实的地下植被和在较开阔的高层环境下时，这些积极影响最大。多种管理选项影响了对底层清除的再生响应。例如，较老的种植幼苗的生长对去除的反应较小，而针对大型浏览器的防护则增加了生长响应。
- 采取不同策略的树种对下层清除的反应不同。与中等或后期成功树种相比，早期成功物种的生长和生存响应对下层清除的反应更为强烈。
- 综合与应用。我们的研究表明，在温带森林环境中，清除林下树木可以对树木再生产生强大的积极影响。这些影响的严重程度取决于林下和林下条件，还取决于再生的树种类型。我们的结果可以为森林管理者的决策提供支持，并帮助评估在什么情况下最有理由进行林下清除工作。
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