• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>New Forests >Observed dynamics of ponderosa pine (Pinus ponderosa var. ponderosa Dougl. ex Laws.) seedling recruitment in the Cascade Range, USA
【24h】

Observed dynamics of ponderosa pine (Pinus ponderosa var. ponderosa Dougl. ex Laws.) seedling recruitment in the Cascade Range, USA

机译：在美国喀斯喀特山脉观察到的美国黄松松（Pinus藏黄松var。藏黄松Dougl.ex Laws。）的动态

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

An observational study of early seedling establishment (first 1–2 summers after emergence) was conducted in four ponderosa pine (Pinus ponderosa var. ponderosa Dougl. ex Laws.) stands east of the Cascade Range crest in central Oregon, USA. Newly emerged ponderosa pine seedlings were identified at the start of summer and were monitored through their second summer; a subsequent cohort of seedlings was identified and monitored for one summer. About 3% of the viable seed that was produced resulted in new seedlings. Mortality was substantial immediately following emergence. Most seedlings emerged without shading from understory vegetation, but few survived. Most seedlings alive after one year had emerged beneath live cover; by the end of two summers only shaded seedlings were alive. 63–85% of new seedlings initiated in clusters attributed to rodent caching, and seedlings originating in clusters remained a substantial proportion of the cohort (60%) after two seasons. Results suggest that understory vegetation in these types of stands facilitates the recruitment of ponderosa pine seedlings, most likely by buffering them against environmental stressors during the seedling establishment phase. They also reveal that seed caching rodents are highly active in seed redistribution and can exert a lasting influence on seedling recruitment.
机译：在美国俄勒冈州中部喀斯喀特山脉顶以东的四个美国黄松（Pinus tankerosa var。tankerosa Dougl。ex Laws）上进行了幼苗早期建立的观察研究（出苗后的前1-2个夏天）。在夏季开始时鉴定出新出现的黄松松苗，并在第二个夏季进行监测。随后确定了一组幼苗，并在一个夏天进行了监测。所产生的约3％的可行种子产生了新的幼苗。出现后，死亡率很高。多数幼苗出苗时没有被地下植被遮挡，但幸存下来的很少。一年后，大多数存活的幼苗已在活动掩体下生长；到两个夏天结束时，只有遮荫的幼苗才能存活。在群集中萌发的新幼苗中有63–85％归因于啮齿动物的缓存，而在两个季节后，来自群集中的幼苗仍占队列的很大一部分（60％）。结果表明，这些林分类型的林下植被有利于招募黄松树幼苗，最有可能的是在幼苗建立阶段通过缓冲环境中的压力来缓解它们。他们还揭示了种子缓存啮齿动物在种子重新分配中非常活跃，并且可以对幼苗的募集产生持久的影响。

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