- AP News
- Abc News
科学美国人：Diverse Tree Portfolio Weathers Droughts Better
60秒科学节目（SSS）是科学美国人网站的一套广播栏目，英文名称：Scientific American - 60 Second Science,节目内容以科学报道为主，节目仅一分钟的时间，主要对当今的科学技术新发展作以简明、通俗的介绍，对于科学的发展如何影响人们的生活环境、健康状况及科学技术，提供了大量简明易懂的阐释。
You've probably heard the financial advice that a diversified portfolio is better in turbulent times? Well that same wisdom may hold true for our stocks of trees. Because ecologists say forests with a diversity of trees are better at weathering drought. The reason:
"There's a huge difference and a huge diversity of water transport strategies in trees." William Anderegg is an ecologist at the University of Utah. "It's everything from having deeper roots or shallower roots, to having these pipes that are incredibly well armored to withstand drought or incredibly weak in the face of drought."
Anderegg and his team studied droughts in 40 forests around the world. And the forests with diverse tree populations, with a mix of water-management strategies, did better than forests made up of just one or a few species. Could be a couple reasons for that.
"One is that there are other forces that are acting on the ecosystem at the same time. Other stressors like insect attack, or other things they're competing for, competing for light and for nutrients, and this is why a more diverse forest is going to be more functional. It'll be more resilient to drought but maybe also have higher carbon uptake rates over the long term."
The second possibility, he says, is that a monoculture of drought-ready trees may look really resilient to drought. "Up until the drought is severe enough that a whole bunch of the trees shut down or even die. That threshold cliff response you would get in a one species forest and you may not get in a diverse forest." The full report is in the journal Nature. [William R. L. Anderegg et al, Hydraulic diversity of forests regulates ecosystem resilience during drought]
The lesson for land managers, he says, is that forest restoration efforts following wildfires and disease outbreaks might want to focus on planting a diverse portfolio of tree species. So that even if water plummets, tree stocks will, hopefully, remain stable.
[The above text is a transcript of this podcast.]
- 科学美国人：Beer Fermentation Hops Along
- 科学美国人：Pirates Needed Science Too
- 科学美国人：Genetic Tweak Gave Early Humans a Leg Up
- 科学美国人：Sea Otters' Powerful Paw Prey Perception
- 科学美国人：Nobel in Chemistry for New and Useful Chemical Entities via Evolutiona
- 科学美国人：Earlier Springs May Mean Mistimed Bird Migrations
- 科学美国人：Nobel in Physics for Controlling Laser Light
- 科学美国人：Blasey Ford Spells Out Trauma Memory Formation
- 科学美国人：Nobel for Helping the Immune System Fight Cancer
- 科学美国人：Genetic Tweak Gave Early Humans Leg Up