# Giant trees have no trouble pumping water to top branches

> 来源：[HackerNews](https://news.exeter.ac.uk/faculty-of-environment-science-and-economy/giant-trees-have-no-trouble-pumping-water-to-top-branches/)

> 恢复说明：本文为订阅中断后的恢复稿，基于标题、来源链接和公开上下文生成，正式发布前建议人工复核。

# Giant trees have no trouble pumping water to top branches

**来源：** HackerNews  
**链接：** https://news.exeter.ac.uk/faculty-of-environment-science-and-economy/giant-trees-have-no-trouble-pumping-water-to-top-branches/  
**摘要：** Giant trees have no trouble pumping water to top branches

## 背景

植物通过木质部把水分从根部输送到冠层，这一过程通常由“内聚力-张力理论”解释：叶片蒸腾产生的负压沿着连续水柱向上传递，将土壤中的水分“拉”到高处的枝条。对于红杉、巨杉等高度可达数十米甚至上百米的巨型树木，重力、摩擦阻力、导管栓塞化以及气穴形成等都被认为可能构成水力瓶颈。一些传统模型因此推测，树木高度