是一个炎热的气候使树木生长速度更快,更轻的木头吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换

是一个炎热的气候使树木生长速度更快,更轻的木头吗?

2021 - 01 - 17 t02:16:06z

后,我开始思考这对倒下的树看几篇文章,特别是一些文章非常大的树在洛杉矶和纽约。加上,只是思考的野火在美国西部开始树落在电线。虽然我没有做过广泛的研究,但我做了一些搜索和发现如下: < a href = " https://www.tum.de/nc/en/about-tum/news/press-releases/details/34892/ " rel = " nofollow noreferrer " >树和气候变化:更快的增长,轻木< / >。This article discusses how "wood density of European trees decreasing continuously since 1870."

So is this a current concern and a global phenomena? Are trees growing faster, but are less strong. Combining this thought with the fact that winds are getting stronger in North America seems very unsettling.

blacksmith37回答的是一个炎热的气候使树木生长更快,更轻的木头吗?

2021 - 01 - 17 t16:09:41z

与气候变化。更快的增长产生低密度和强度。There are strength tables for wood written more than 50 years ago that have separate listings for "new " growth and "old" growth. "New " growth being trees growing faster in clear cut areas with less competition for water, light and nutrients. Old is trees in areas that not previously been harvested and grew slower in crowded conditions. Power line failure is related to the increase in numbers of power lines in expanding populated areas, and to how much money utilities spend trimming trees near the power lines. When I drove in western Europe in the 80's , I was impressed by how many of the forests had been "managed". Large old trees had been planted in regularly spaced straight lines ,maximizing growth speed = lower density . As silviculture is a minor hobby of mine I expect I noticed things others would not.

灰的回答是一个炎热的气候使树木生长更快,更轻的木头吗?

2021 - 01 - 18 - t21:36:29z

许多树种的增长速度比自然分布区的气候温暖,特别是在增加的热量加上潮湿的环境,和更快的增长通常是降低木材密度。这就是为什么很多新西兰种植松树只适用于纸浆,温暖湿润的气候意味着树木快速增长和湿低密度木头,没有良好的结构性能。但这并不占大多数的变化出现在欧洲森林在过去150年里;trees also grow faster, and therefore have "lighter" wood when grown in lower density stands. In managed forests trees are separated at intervals convenient to human maintenance staff and their equipment and are thus considerably farther apart than they would be if they had grown from seed in a wild setting and as tree farm mechanisation has increased so has tree spacing in plantation stands. Climate change could alter wood densities in the long run but at this stage we aren't seeing those effects in timber yet, it may be effecting young stands right now but we won't see the results for a number of years.

LazyReader回答的是一个炎热的气候使树木生长更快,更轻的木头吗?

2021 - 01 - 19 t05:17:19z

一度上升温度几乎没有明显改变。最大的变化是额外的大气二氧化碳导致持续增长和较长的生长季节。二氧化碳的可用性是维持植物生长的主要指标。很多的树在洛杉矶和纽约........是老了。一些2 - 3世纪,这就是为什么一些下降或死亡。但更快的增长率做木材密度就越低,因为树的年轮。当面对压力或不利条件,一棵树可能几乎没有增长。即使在理想的气候树必须争夺阳光,水和营养物质。总体气候变暖肯定好处树木生长; certainly not kill it.