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The scientists said their finding is important for understanding the link between global warming and a rise in greenhouse gases. It could also have implications for the Kyoto Protocol, which calls for developed countries to cut their emissions of greenhouse gases by 5. 2 below 1990 levels by December, 2008. It was discovered that living plants emit 10 to 100 times more methane than dead plants. Scientists had previously thought that plants could only emit methane in the absence of oxygen. David Lowe, of the National Institute of Water and Atmospheric Research in New Zealand, thinks the findings are startling and controversial. According to David Lowe, Keppler and colleagues' finding helps to account for observations from space of incredibly large plumes of methane above tropical forests. But the study also poses questions, such as how such a potentially large source of methane could have been overlooked and how plants produced it. There will be a lively scramble among researchers for the answers to these and other questions. |
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kē xué jiā shuō tā men de zhè yī fà xiàn duì liǎo jiě quán qiú biàn nuǎn yǔ wēn shì qì tǐ zēng jiā zhī jiān de guān xì fēi cháng zhòng yào. lìng wài, cǐ fā xiàn hái duì jīng dū xié yì yì yì shēn yuǎn, gāi xié yì hào zhào fā dá guó jiā zài 2008 nián 12 yuè zhī qián shǐ wēn shì qì tǐ de pái fàng liàng jiǎn shǎo 5. 2, cóng ér dī yú 1990 nián de shuǐ píng. kē pǔ lēi bó shì hé tā de tóng shì men fā xiàn, huó zhe de zhí wù suǒ pái fàng de jiǎ wán liàng shì sǐ qù zhí wù de 10 100 bèi, ér kē xué jiā men xiān qián zé rèn wéi zhí wù zhǐ yǒu zài quē yǎng shí cái néng shì fàng chū jiǎ wán. xīn xī lán guó jiā shuǐ lì qì xiàng yán jiū suǒ de dà wèi luó yī rèn wéi, kē pǔ lēi hé tóng shì men de fā xiàn lìng rén chī jīng ér qiě huì yǐn fā hěn duō zhēng yì. tā shuō, zhè yī fà xiàn kě yǐ bāng zhù jiě shì yī zhǒng xiàn xiàng: cóng kōng zhōng guān chá rè dài sēn lín de shàng fāng, rén men huì fā xiàn dà liàng jiǎ wán duō de lìng rén nán yǐ zhì xìn, dàn cǐ yán jiū yě tí chū le zhū rú wèi hé rú cǐ dà liàng de jiǎ wán jìng bèi hū shì yǐ jí zhí wù shì zěn yàng chǎn shēng jiǎ wán de zhī lèi de wèn tí. yán jiū zhě men huì jìng xiāng duì zhèi xiē wèn tí jǐ yǔ dá àn. |