• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >Effects of green tree retention on boreal forest understorey vegetation
【24h】

Effects of green tree retention on boreal forest understorey vegetation

机译：绿树保留对北方森林林下植被的影响

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In green tree retention (GTR) felling, patches of initial forest are preserved in order to maintainsome of the initial biological diversity over the long forest regeneration phase. However, thepatches are often prone to tree uprooting and other edge-effects. This study from SouthernFinland examines the effects of GTR felling to understorey vegetation in GTR patches, whichwere around 10 times larger than in the current practice. The patches were located on biologi-cally rich swamped spruce forest on the basis of preceding biotope mapping. Understorey vege-tation coverage and its' species numbers were measured from systematically located (accordingto distance from the patch edge and to cardinal point) permanent study plots during one pre-treatment year and two post-treatment years. One year after the felling, coverage of vascularplants increased in the GTR patches, while coverage of bryophytes decreased, respectively. Ingeneral, coverage of vascular plant species decreased slightly towards to the centre of the patch,while coverage of bryophytes increased, respectively. Two years after the felling, coverage ofmosses in the southern side of the patches had declined on lower level if compared to the north-ern side. Species number of vascular plant species remained constant, but species number ofbryophytes decreased significantly during the study period. In general, species number of bryo-phytes was slightly higher in the edges than in the centre of the patches, while number of vascu-lar plants increased towards the interior and then steeply declined in the very centre of thepatches. The results show that even in relatively large GTR patches, abundance of forest interiorspecies (mainly bryophytes) reduces significantly after felling. This is probably due to the mac-roclimatic edge-effects from the felling area, which increased when high amount of uprootingswas formed due to the strong wind events in the patches during the study period. Size and loca-tion of GTR patches should be considered carefully according to the local respective manage-ment objectives in order to better preserve the initial vegetation.
机译：在绿树保留（GTR）砍伐中，原始森林的斑块被保留下来，以便在漫长的森林再生阶段维持某些原始生物多样性。但是，斑块经常容易生出树木连根拔起和其他边缘效应。这项来自SouthernFinland的研究调查了GTR砍伐对GTR斑块中的下层植被的影响，GTR斑块是当前实践中的10倍左右。根据先前的生物群落图谱，将斑块放置在生物丰富的云杉林中。在治疗前的一年和治疗后的两年中，从系统定位的永久性研究地块（根据从斑块边缘到基点的距离）测量地下植被的覆盖范围及其物种数量。砍伐后一年，GTR斑块中维管植物的覆盖率分别增加，而苔藓植物的覆盖率则分别下降。通常，维管束植物物种的覆盖率分别朝着斑块的中心略微减少，而苔藓植物的覆盖率则分别增加。砍伐两年后，与北部相比，斑块南侧的苔藓覆盖率有所下降。维管植物物种的种类数目保持不变，但苔藓植物的种类数目在研究期间显着减少。通常，苔藓植物的物种数量在边缘处比斑块的中心略高，而脉管植物的数量向内部增加，然后在斑块的中心急剧下降。结果表明，即使在相对较大的GTR斑块中，砍伐后森林内部物种（主要是苔藓植物）的丰富度也会显着降低。这可能是由于采伐区的宏观气候边缘效应造成的，当研究期间斑块中的强风事件形成大量的连根拔起时，这种效应会增加。 GTR斑块的大小和位置应根据当地各自的管理目标仔细考虑，以更好地保护原始植被。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号