...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tree Physiology >Bole water content shows little seasonal variation in century-old Douglas-fir trees
【24h】

Bole water content shows little seasonal variation in century-old Douglas-fir trees

机译：百年枞树中的勃乐水含量几乎没有季节性变化

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

Purportedly, large Douglas-fir trees in the American Pacific Northwest use water stored in bole tissues to ameliorate the effects of seasonal summer drought, the water content of bole tissues being drawn down over the summer months and replenished during the winter. Continuous monitoring of bole relative water content (RWC) in two 110-120-year-old Douglas-fir trees with ThetaProbe impedance devices provided an integrated measure of phloem-sapwood water content over 4 years. Seasonal changes in RWC closely tracked cambial activity and wood formation, but lagged changes in soil water content by 2-3 months. The RWC in the combined phloem and sapwood markedly increased during earlywood production in the late spring and early summer to maximum values of 64-77% as plant available soil water (ASW) decreased by ~60%. With transition and latewood formation, RWC decreased to minimum values of 59-72%, even as ASW increased in the fall. The difference between minimum RWC in the fall and maximum RWC in midsummer was only ~5%. Seasonal changes in bole RWC corresponded to cambial phenology, although decreasing AWS appeared to trigger the shift from earlywood to latewood formation.
机译：据说，美国太平洋西北部的大型道格拉斯杉树使用储存在猪油纸巾中的水来改善夏季季节性干旱的影响，在夏季，牛油纸巾的水分会减少，并在冬季进行补充。使用ThetaProbe阻抗设备连续监测两棵110-120年历史的道格拉斯杉树中的胆汁相对含水量（RWC），提供了4年中韧皮-边材含水量的综合测量。 RWC的季节性变化密切跟踪了冈比亚的活动和木材形成，但在2-3个月后土壤含水量变化却滞后。韧皮部和边材的结合中的RWC在春季末和夏季初的早期木材生产期间显着增加，最大值为64-77％，这是因为植物可利用的土壤水（ASW）减少了约60％。随着过渡和晚材的形成，即使秋季ASW增加，RWC也会降至最小值59-72％。秋季的最小RWC和仲夏的最大RWC之间的差异仅为5％。尽管AWS的下降似乎触发了从早材向晚材形成的转变，但胆红细胞WC的季节性变化对应于冈比亚的物候。

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