...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>African Journal of Plant Science >Short-term responses of shrub layer communities to dry season fires and tree thinning in semi-arid miombo woodlands of north-western Zimbabwe
【24h】

Short-term responses of shrub layer communities to dry season fires and tree thinning in semi-arid miombo woodlands of north-western Zimbabwe

机译：津巴布韦西北部半干旱的Miombo林地灌木层群落对旱季火灾和树木稀疏的短期响应

获取原文
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Short-term responses of shrub layer communities to dry season fires and tree-thinning were investigated in semi-arid miombo woodlands in North-western Zimbabwe. Fifty-four (54) plots, 50 x 50 m each, were demarcated at three miombo sites. Treatments applied were: no burn, no tree thinning; no burn, thinned; early burn, no thinning; early burn, thinned; late burn, no thinning; late burn, thinned. After three years, height structure of the shrub layer communities had significantly changed, with increases in proportions of plants below 10 cm in burnt plots due to height reductions of burnt plants and additions from natural recruitment. Non-burnt plants significantly increased in heights while frequent burning kept plants in a fire-trap. Reductions in heights were further exacerbated by herbivore browsing of new resprouts. Numbers of stems significantly increased in late burnt plants. This is a survival strategy inherent in the life history characteristics of plants in fire-prone environments to ensure quick re-establishment and regain their above-ground biomass for survival. Changes in heights of selected individual samplings did not differ among sites or between thinning treatments while burning led to increases in stems.?Monotes glaber?and?Pseudolachnostylis maprouneifolia?had above-average height increases. Mortality was low with only 5.1% in late-burnt, thinned plots, indicating good tolerance to fire.
机译：在津巴布韦西北部的半干旱米翁布林地，调查了灌木层群落对旱季火灾和稀树的短期反应。在三个miombo地点划定了五十四（54）个地块，每个地块50 x 50 m。所采用的处理方法是：不烧伤，不树木稀疏;不燃烧，变薄;早烧，不稀疏;早期烧伤，变薄;晚烧，不稀疏;后期烧伤，变薄。三年后，灌木层群落的高度结构发生了显着变化，由于焚烧植物的高度降低和自然补充而增加了，在焚烧区中10 cm以下的植物比例有所增加。未燃烧的植物的高度显着增加，而频繁燃烧将植物置于火塘中。草食动物浏览新的芽苗菜，进一步加剧了身高的下降。在后期燃烧的植物中，茎的数量显着增加。这是易生火环境中植物生命史特征所固有的生存策略，以确保快速重建并恢复其地上生物量以求生存。选定的单个样品的高度变化在地点之间或稀疏处理之间没有差异，而燃烧导致茎增加。Monotes glaber和Pseudolachnostylis maprouneifolia的高度均高于平均水平。在后期燃烧，稀疏的地块中，死亡率很低，只有5.1％，表明对火具有良好的耐受性。

著录项

相似文献

  • 外文文献
  • 中文文献
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