搜索结果: 76-90 共查到“国际动态 林学”相关记录356条 . 查询时间(1.889 秒)
A new study by scientists at the Cornell Lab of Ornithology and other institutions confirms that most birds -- but not all -- synchronize their migratory movements with seasonal changes in v...
Few places on Earth are as rich in biodiversity, and as removed from human influence, as the world's largest rainforest -- the Amazon. Scientists at Louisiana State University have been cond...
世界最高树木吸碳能力超估算
世界 最高树木 吸碳能力 超估算
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2020/10/19
美国和英国研究人员用激光测量后发现，世界最高树木重量远高于原来估算，吸收的碳元素也比原来估算多。据英国《泰晤士报》16日报道，英国伦敦大学学院和美国马里兰大学研究人员用激光测量美国加利福尼亚州北部生长的红杉后得出上述结论。红杉是世界上最高的树种。研究人员测量发现，一株名为“阿姆斯特朗上校”的老红杉高88米、重110吨，而原来估算重量是70吨至90吨。与先前测量技术相比，激光测量结果更准确。
Statement on the Nobel Prize for Economics 2020（图）
Wildfires changing forest communities interior Alaska
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2020/10/16
As boreal forest wildfires increase in severity and frequency, new patterns of post-fire recovery are emerging. Research led by Jill Johnstone and colleagues at the U.S. National Science Foundati...
Forest margins may be more resilient to climate change than previously thought（图）
Forest margins resilient climate change previously thought
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2020/10/10
A warming climate and more frequent wildfires do not necessarily mean the western United States will see the forest loss that many scientists expect.Dry forest margins, areas where forest meets sagebr...
《自然》发文反思澳洲灾难性林火
《自然》 澳洲 灾难性林火
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2020/8/18
英国《自然》杂志2020年8月12日发表的一篇时评文章中，澳大利亚塔斯马尼亚大学科学家戴维·布朗及其同事反思了澳洲林火，并指出：澳大利亚需要一个专门的全国性林火监测机构，以具有成本效益和循证的方式提供必要的明确信息，用于管理和缓解火灾。2019年至2020年，澳大利亚的林火摧毁了成千上万的房屋和数百万公顷的植被，被称为是澳大利亚建国以来最严重的“灾难性林火”。高温天气和干旱是林火肆虐的主要原因，从...
Tree cover increased in Southeast Michigan over the past 30 years（图）
Tree cover increased Southeast Michigan over past 30 years
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2020/8/14
The extent of both tree canopy and urban sprawl increased in Southeast Michigan between 1985 and 2015, according to a new University of Michigan study that used aerial photos and satellite i...
In a warming world, New England's trees are storing more carbon（图）
warming world New England trees storing more carbon
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2020/8/14
Climate change has increased the productivity of forests, according to a new study that synthesizes hundreds of thousands of carbon observations collected over the last quarter-century. The ...
Rising temps put desert shrub in high-efficiency mode（图）
Rising temps put desert shrub high-efficiency mode
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2020/7/31
Death Valley doesn't seem like the best place to ride out rising temperatures amid a changing climate. But for the desert plants that live there, it's home -- and they face the choice to adapt or die....
世界上最古老的树木也非长生不老（图）
世界上 最古老 树木 长生不老
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2020/7/28
地球上最古老的树木已经屹立了近5000年，研究人员一直想知道这些古老的生物会在多大程度上衰老、机体会如何随年龄的增长而退化。最近发表的一篇研究世界上最长寿树木之一银杏树的论文甚至发现，银杏树或能“在整个植物层面上避免衰老”，这就提出了一个问题，即百年老树明显没有衰老。然而，7月27日发表在Cell Press细胞出版社旗下期刊 Trends in Plant Science（《植物学趋势》）上的文...
Lightning strikes more than 100 million times per year in the tropics（图）
Lightning strikes 100 million times per year tropics
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2020/7/31
Scientists at the Smithsonian Tropical Research Institute in Panama have published dramatic maps showing the locations of lightning strikes across the tropics.Based on ground and satellite d...
河流植物是水文变化的“天然缓冲器”
河流植物 水文变化 天然缓冲器
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2020/7/24
近日，荷兰、英国和比利时科学家合作在《皇家学会学报B：生物科学》共同发表最新研究成果，称通过生物物理反馈机制和水生植被自组织产生的流量调节，河流植物既可以抵抗洪水，又可以防止干涸，从而保护了生物多样性。研究团队首席科学家洛瑞塔·考纳齐亚称：“它们为水文变化提供了天然的缓冲器。”通过将数学模型与现场数据相结合，该团队得出了三条结论：一是，植被生长和局部流速之间的反馈产生了一个自组织过程，该过程使植被...
破坏野生动植物世界会增加跨物种污染风险（图）
野生动植物世界 跨物种 污染风险
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2020/7/14
法国国家科学研究中心（CNRS）研究员法兰克·库尚近日在接受法国《费加罗》报采访中表示，人类对动物施加的压力越大，或者破坏动物的栖息地越多，越会增加跨物种污染的风险。库尚称，野生世界有大量病原体，新兴疾病中近三分之二是动物起源的。新冠病毒就是这种情况，此前的艾滋病病毒、埃博拉病毒和寨卡病毒也都是这种情况。据估计，仅在哺乳动物体内就有32万种病毒尚未鉴定。
Warming reduces trees' ability to slow climate change（图）
Warming reduces trees ability slow climate change
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2020/7/10
The world's forests play an important role in mitigating climate change. Trees are carbon sinks -- they absorb more carbon dioxide than they emit. But according to new National Science Foundation...
Bedrock type under forests greatly affects tree growth, species, carbon storage（图）
Bedrock type under forests greatly tree growth species carbon storage
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2020/6/19
A forest's ability to store carbon depends on the bedrock beneath, according to Penn State researchers who studied forest productivity and composition and the physical characteristics of roc...