Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour.Methane emissions tripled when living and dead plant was exposed to sunlight.
Beeause there was plenty of oxygen available,its unlikely that the types of bacteria that normally make methane were involved. Experiments on plants that weregrown in water rather than soil also resulted in methane emissions.Thats another strong sign that the gas came from the plants and not soil microbes.
The new finding is an interesting observation, says Jennifer Y.King,a biogeochemist at the University of Minnesota in St.Paul3.Because some types of soil microbes consume methane,they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plants influence,she notes.
词汇:
methane/5meWein/n.甲烷,沼气 emission/i5miFEn/n.散发,发射
geochemist n.地球化学家 triple/5tripl/v.增加三倍;adj.三倍的
Celsius n..adj.摄氏 bacteria/bAk5tiEriE/n.细菌
microbe/5maIkrEJb/n.微生物 nanogram n.微克
biogeochemist n.生物地球化学家 chamber/5tFeimbE/n.室,房间;腔
注释:
1. the Max Planck Institute for Nuclear Physics in Heidelberg,Germany:马克思普朗克核物理研究所,位于德国海德堡。海德堡系德国西南部城市,在巴登一符腾堡州的内卡河畔。海德堡大学是德国历史最悠久的大学。
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