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Nortliern Forests Rev up Carbon Cycle
北部森林加快碳循環(huán)
Northern forests are not just surviving but thriving.
北方森林不僅僅幸存下來，而且生長旺盛。
Ecosystem productivity is rising at high latitudes, with a roughly 50% increase in the amount of carbon cycling through northern landscapes since the 1950s,
在高緯度地區(qū)生態(tài)系統(tǒng)生產(chǎn)率正在上升。根據(jù)今天發(fā)表在《科學》雜志上的一篇關(guān)于大氣二氧化碳趨勢的分析，
according to an analysis of atmospherics carbon dioxide trends published today in Science.
自20世紀50年代以來北 部風景區(qū)的碳循環(huán)數(shù)量大約增長了50%。
Boreal forests in particular have shown marked increases in carbon uptake during summer.
特別是北方森林，在整個夏天碳的吸收量有了顯著增長。
"Something quite massive is taking place on large parts of the landscape that are not directly impacted by humans,"
研究者拉爾夫·吉林說：“大自然里發(fā)生的一些相當大規(guī)模的事件 沒有受到人類直接的影響?！?/div>
says study coauthor Ralph Keeling, a geochemist at the Scripps Institution of Oceanography in La Jolla, California,
他是位于加州拉霍亞的斯克里普斯海洋研究所的一名地球化學家，
which runs a CO2 monitoring programme at Hawaii's Mauna Loa Observatory.
同時他也在夏威夷的莫納羅亞山天文臺進行一項二氧化碳監(jiān)測計劃。
The research examines large seasonal swings in atmospheric CO2 levels in the Northern Hemisphere, which is home to the bulk of Earth's land.
這項研究檢測了北半球大氣中二氧化碳水平大量季節(jié)性波動，這里擁有大部分的地球陸地。
Each spring, dormant plants awaken and begin taking in CO2 to fuel photosynthesis.
每年春天休眠的植物蘇醒，并利用二氧化碳作為原料來進行光合作用。
The pendulum reverses in autumn, when the release of CO2 increases as leaves fall and photosynthesis gives way to respiration by plants and microbes.
在秋天就會反過來，隨著葉子的掉落，釋放的二氧化碳會增加，這樣光合作用就變成了植物和微生物的呼吸作用。
Researchers compared detailed aerial measurements of atmospheric CO2 levels taken in 2009-11 with data from an aerial survey conducted in 1958-61
研究人員將2009年至2011年間大氣中二氧化碳含量詳細的空氣 測量指標與從1958年到1961年間的空氣調(diào)查數(shù)據(jù)，
and observations from Mauna Loa and a second long term monitoring site in Barrow, Alaska.
以及來自于莫納羅亞山和第二個在阿拉斯加巴羅的長期監(jiān)測站點所觀察的數(shù)據(jù)進行比較。
The results suggest that the amplitude of the annual C02 swing has increased over time and continues to rise today, despite growing concerns about the vulnerability of northern forests to pests and fires.
結(jié)果表明，每年二氧化碳的波動振幅都在逐年上升，并且目前仍在持續(xù)上升，盡管越來越多的人開始關(guān)注北部森林在抵御蟲害和火災(zāi)時的不足。
"Everybody hears about negative feedbacks on the carbon cycle, but this study shows that the activity of the biosphere is increasing in spite of climate change. "
“每個人都聽說了碳循環(huán)的負反饋，但這項研究表明，盡管氣候發(fā) 生了變化，生物的活動仍在加劇。”
says Philippe Ciais，a carboncycle researcher at the Laboratory of Climate and Environmental Sciences at Gif-sur- Yvette，F(xiàn)rance，who was not ivolved in the research.
法國伊凡特氣候和環(huán)境科學實驗室的研究員菲利普·西艾斯說，但他沒有參與這項研究。
