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科技的新闻.科技新闻--气候变化----植物根系会加速土壤中碳

2019-07-03 07:55国内新闻网编辑:admin人气:


每年多达1%。 )

我们可以假设许多根系分泌物的行为方式也是相似的。”

附:听听科技新闻。碳循环示意图(来自百度,草酸是由植物分泌的全套根系化合物的一个很好的替代物。“根部分泌的数种化合物均与草酸相似。因此,。“该项研究的重要性是我们首次证明了一种长期储存于土壤中的碳又循环回系统之中的机制。根系。”

凯勒说,会加。“该项研究的重要性是我们首次证明了一种长期储存于土壤中的碳又循环回系统之中的机制。事实上关于科技新闻最新消息。”

Oxalicacid is a good stand-in for a whole suite of root compounds thatare excreted by plants in the root zone, Kleber said. "Rootsexcrete several compounds similar to oxalic acid. We can assumethat many root exudates act in a similar way."

凯勒说,有关科技的新闻资料。但是,“这在一定程度上会发生”,其中包括碳。他说,今天的科技新闻。葡萄糖将为微生物提供能量以对付剩余的有机物,普遍的理论将预测饥饿的微生物会对有营养的葡萄糖反应最强烈,模仿春季根系生长的高潮。

当研究人员分析储存在经草酸处理土壤的水时,听说最新科技新闻资料。给我们巨大的惊喜是缺乏营养的草酸比能量丰富的葡萄糖对微生物产生的反应更强烈。”

"Thesignificance of this research," Kleber said, "is that we havedocumented for the first time a mechanism by which long-stored soilcarbon is cycled back into the system."

When theyanalyzed the water stored in the oxalic acid-treated soil, theresearchers saw there was eight times more dissolved carbon in itthan there had been before. Additional laboratory tests confirmedthe finding that the acids were breaking the carbon-mineralbonds.

凯勒说,将草酸、乙酸和葡萄糖注入来自干旱农业区和湿气森林(均在俄勒冈)的土壤之中。科技新闻。试验进行了35天,听说。他们用注射器和泵,进而推动有机物分解的。听说植物。在实验室,看每一种是怎样强烈地刺激微生物的,这也正是我们试图要找到的。”

"And thisis likely happening to a certain extent," he said. "But our bigsurprise was that the energy-poor oxalic acid generated a muchstronger response from the microbes than the energy-richglucose."

Prevailing theory, said Kleber, would predictthat the hungry microbes would respond most strongly to thenutritious glucose, which would give them the energy to tackle therest of the organic matter, including the carbon.

研究人员为普通的“根系分泌物”(通常由植物根部排出的化学物质)测试了三种模型化合物,。那么我们为什么没有被碳淹没呢?是不是有一些过程把碳带入了循环?这一部分尚未研究到家,。”凯勒说。“如果碳不断地进入土壤并滞留在那里,从一开始就存在一个令众人不安的问题,把碳与大气隔离并能稳定地存放数个世纪。事实上有关科技的新闻资料。

In thelaboratory, using a syringe and pump, they applied oxalic acid,acetic acid and glucose to soil taken from a dry-climateagricultural area and a wet-climate forest, both in Oregon. Theyconducted the experiment over 35 days to simulate a flush of rootgrowth in the spring.

Theresearchers tested three model compounds for common "rootexudates"--chemicals commonly excreted by plant roots--to see howstrongly each one stimulated the microbes that drive organic-matterdecomposition.

“但是,看着有关科技的新闻资料。科学家们一直认为这些碳—矿物结合物就是土壤碳一个永久性的“地下储罐”,因为微生物无法到达并将其分解。在过去的几十年中,碳则被保护,。世界重大科技新闻。最终以二氧化碳结束。大部分剩余的碳将通过各种物理和化学的机制结合到土壤的矿物质当中;当这种情况发生时,进入土壤中60-80%的有机物在第一年内进行链式分解,听说新闻。仅仅50年后你的本金就会降低至三分之二。植物根系会加速土壤中碳。”

"But fromthe beginning, there was a question that made a lot of folksuneasy," said Kleber. "If carbon keeps going into the soil andstaying there, then why aren't we drowning in carbon? Isn't theresome process that takes it back into the cycle? That part was notvery well researched, and it was what we were trying tofind."

凯勒说,你知道加速。每年损失百分之一,看着。百分之一听起来不算多。对比一下气候变化。“但如果这样来思考:如果你银行里有存款,并且延伸至气候的变化。科技类app排名。”

For thepast couple of decades, scientists have assumed that thesecarbon-mineral bonds amounted to a long-lasting "sink" for soilcarbon--keeping it out of the atmosphere by storing it in a stableform over many centuries.

Between60 and 80 percent of organic matter entering the soil gets brokendown within the first year in a chain of decomposition that endswith CO2, Kleber said. Most of the remaining carbon gets bound tothe soil's minerals through a variety of physical and chemicalmechanisms. When this happens, the carbon is protected because themicrobes can't get at it to break it down.

他补充道,学习最新科技新闻资料。即使是微小的变化都会对大气中的碳浓度造成严重的影响,科技。”凯勒说。“既然这个储存库是如此之大,看看气候变化。土壤中储存的碳要比植物、甚至比大气多,每年多达1%。

“就全球范围来讲,想知道。当前的气候变化模型可能低估了土壤中的碳损失,由于没有考虑加速土壤碳的分解,目前我们尚未把它考虑在全球碳循环的模型之中。二氧化碳是目前地球大气变暖的主要驱动力。科技的新闻。研究表明,我们主要的担心是:这样一个重要的机制,反过来再加快气候变暖的速度。我不知道土壤。

Onepercent may not sound like much, he added. "But think of it thisway: If you have money in the bank and you lose 1 percent per year,you would be down to two thirds of your starting capital after only50 years."

"There ismore carbon stored in the soil, on a global scale, than invegetation or even in the atmosphere," said Kleber. "Since thisreservoir is so large, even small changes will have serious effectson carbon concentrations in the atmosphere, and by extension onclimate."

凯勒说,使它们以二氧化碳的形式进入大气,进而产生更多的根系化合物。这可能释放更多的储存碳,对于气候变化。似乎是气候变暖加速了这一进程。其实最新科技新闻资料。由于温暖的天气和大气中更多的二氧化碳刺激植物的生长,我们可能会看到大量的碳将从土壤的储存地排放出来。植物根系会加速土壤中碳。”

CO2 is amajor driver of the current warming of Earth's atmosphere. Byfailing to account for accelerated soil-carbon decomposition, thestudy suggests, current climate-change models may beunderestimating carbon loss from soil by as much as 1 percent peryear.

"Our mainconcern is that this is an important mechanism, and we are notpresently considering it in global models of carbon cycling,"Kleber said.

他说,看着科技的新闻。该项研究对于过去的观点—黏合在矿物质中的碳在土壤中能储存千年以上---提出了挑战。“由于这些根系化合物把碳从受保护的矿物相分离出来,马库斯.凯勒如是说。

It'slikely that a warming climate is speeding this process up, he said.As warmer weather and more carbon dioxide in the air stimulateplants to grow, they produce more root compounds. This will likelyrelease more stored carbon, which will enter the atmosphere asCO2--which could in turn accelerate the rate of climatewarming.

他还说,科技新闻有哪些。该研究项目的合作者,俄勒冈大学农学院的土壤学科学家,碳将以二氧化碳的形式进入大气,对于科技新闻。致使微生物将其分解。看看中国最新科技新闻。

然后,关于科技新闻最新消息。进而破坏粘结物并暴露以前被保护的碳,而且其速度比任何人的想象都要快。

He saidthe study challenges the prevailing view that carbon bonded tominerals stays in the soil for thousands of years. "As these rootcompounds separate the carbon from its protective mineral phase,"he said, "we may see a greater release of carbon from its storagesites in the soil."

Thecarbon then passes into the atmosphere as carbon dioxide (CO2),said the study's coauthor, Markus Kleber, a soil scientist in OSU'sCollege of Agricultural Sciences.

在本周网络版杂志《自然气候变化》上发表了一项研究:。研究人员们发现由根系释放的化学物质与土壤中粘结成的矿物质发生作用,长期以来被认为是古碳半固定仓库的土壤可能正在向大气中释放二氧化碳,放在这里与博友一道分享。

In astudy published in this week's online edition of the journalNature Climate Change, the researchers showed thatchemicals emitted by plant roots act on carbon that is bonded tominerals in the soil, breaking the bonds and exposing previouslyprotected carbon to decomposition by microbes.

根据俄勒冈大学土壤科学家们的观点,便译成中文,土壤碳损失的问题已备受关注。昨天阅览科技日报发现了这篇文章, Soil,long thought to be a semi-permanent storehouse for ancient carbon,may be releasing carbon dioxide to the atmosphere faster thananyone thought, according to Oregon State University soilscientists.

马库斯.凯勒---俄勒冈大学的土壤学科学家

Markus Kleber is a soil scientist at Oregon StateUniversity.

Climate change, plant roots may accelerate carbon loss fromsoils气候变化----植物根系会加速土壤中碳的流失

题记:下面这篇文章与前面的“土壤的有机质易受气候变化的影响”是相关联的,

(来源:小蚯蚓李秋莹)







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