...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Flora >Edge and land-use effects on epiphytic lichen diversity in the forest-steppe ecotone of the Mongolian Altai
【24h】

Edge and land-use effects on epiphytic lichen diversity in the forest-steppe ecotone of the Mongolian Altai

机译：边缘和土地利用对蒙古阿尔泰森林草原过渡带附生地衣多样性的影响

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

Epiphytic lichen diversity was studied in forests of Siberian larch (. Larix sibirica) in the forest-steppe ecotone of the Mongolian Altai. These forests are utilized for livestock grazing, fuelwood collection and occasional logging by pastoral nomads. The density of nomad households in the proximity of the forests influences epiphytic lichen diversity more strongly than the position of sample trees in the forest interior or at the forest line to the steppe. This suggests that land use exerts a stronger effect on lichen diversity than the distinct gradient in microclimate between the forest interior and the forest edge. The co-occurrence of nitrophytes with anitrophytic acidophytes on a small spatial scale as well as higher N and Ca concentrations and pH values in the bark of larch trees at the forest edge than in the forest interior indicate that moderate livestock grazing increases the epiphytic lichen diversity due to an increase of the diversity of chemically different microhabitats. Preference of many lichen species (and of rare species in particular) for overmature and decaying trees suggests that logging and fuelwood collection has adverse effects on epiphytic lichen diversity. This adverse effect is likely to be more crucial for lichen diversity than the putatively positive effect of livestock grazing, since more lichens with a preference for old and decaying trees than for nitrogen-enriched bark were found. The present study is the first one investigating the impact of pastoral nomadism in Central Asia on epiphyte diversity.
机译：在蒙古阿尔泰森林草原过渡带的西伯利亚落叶松（。Larix sibirica）森林中研究了附生地衣多样性。这些森林被用于放牧牲畜，薪柴收集和牧民偶尔采伐。靠近森林的游牧家庭的密度对附生地衣多样性的影响要比在森林内部或草原的森林线处的样本树的位置更为强烈。这表明，土地利用对地衣多样性的影响要大于森林内部和森林边缘之间的小气候梯度。在森林边缘的落叶松树树皮中，小规模的同时存在亚硝酸盐和嗜盐性嗜酸菌以及较高的N和Ca浓度以及pH值，表明适度放牧增加了附生的地衣多样性由于化学上不同的微生境多样性的增加。许多地衣物种（尤其是稀有物种）更喜欢树木的过早衰老，这表明伐木和薪材采集对附生地衣多样性具有不利影响。这种不利影响可能比家畜放牧的积极影响对地衣多样性更为关键，因为发现的地衣比对富氮树皮的人更偏爱衰老的树木。本研究是第一个调查中亚牧民游牧对附生植物多样性影响的研究。

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