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zhangok

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[交流] 我们可以从中学到什么?-Mapping tree density at a global scale 已有2人参与

最近国内网站上纷纷报导了美国Yale University博士后Crowther等人在NATURE上的这篇文章,
该文首次定量估算了全球各大洲的林木数量,NATURE网站的语音视频清晰地展示了全球森林的分布情况,
从中我们或许可以获得研究全球碳排放与碳储汇计算与模拟的新型表达方式。
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neaby

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淡定...
2楼2015-09-27 17:22:12
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zhangok

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2楼: Originally posted by neaby at 2015-09-27 17:22:12
求论文摘要

http://www.nature.com/nature/jou ... ll/nature14967.html
Abstract
    Abstract• Change history• References• Author information• Extended data figures and tables• Supplementary information

The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions. Biome-level trends in tree density demonstrate the importance of climate and topography in controlling local tree densities at finer scales, as well as the overwhelming effect of humans across most of the world. Based on our projected tree densities, we estimate that over 15 billion trees are cut down each year, and the global number of trees has fallen by approximately 46% since the start of human civilization.
Subject terms:    Environmental sciences     Forestry     Forest ecology
3楼2015-09-27 23:27:34
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zyuoo001

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小木虫: 金币+0.5, 给个红包,谢谢回帖
现在只获取了density,但很难获取树种、树木年龄,怎么计算碳排放或储汇?
4楼2015-11-13 20:36:41
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zhangok

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4楼: Originally posted by zyuoo001 at 2015-11-13 20:36:41
现在只获取了density,但很难获取树种、树木年龄,怎么计算碳排放或储汇?

是的,这个工作仅仅是提供了一种新的树木计量方法,不同气候带树种的碳储备能力差异很大。
5楼2015-12-01 12:24:36
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