陽光、二氧化碳及水份充足情況下,光合作用在樹葉裡頭發生,二氧化碳的碳原子將儲存在樹木裡,並釋出氧氣。430Please respect copyright.PENANA6DCtZBc8wd
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秋天時份,溫度驟降,樹木意識到冬天即將來臨,便啟動落葉機制,以免冬天低溫為樹葉帶來傷害。430Please respect copyright.PENANAY2KfvckpaK
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(圖2)根據這個理念,全球氣侯所導致的溫度提升,將會使綠葉時間延長1-3星期。430Please respect copyright.PENANAgmhqoMlvnn
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但出乎意外的是,實驗及現實證據指出,綠葉時間反而是平均縮短了3-6日(Ref1)。430Please respect copyright.PENANAJxf7utUhod
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(圖3)分析由1948-2015年達434,226項的樹木數據再加上各種實驗,科學家得出以下的解釋。430Please respect copyright.PENANA71FVcomjaP
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全球變暖再加上大氣二氧化碳含量上升,樹木的光合代謝率亦因而有所提升。430Please respect copyright.PENANAJDfkVOpCCf
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光合代謝的過程中,二氧化碳的碳原子會以固體方式儲存在榭木內。430Please respect copyright.PENANAH6nFvmzadH
如果固體碳原子到達一定的程度,就算溫度和暖,亦會觸發樹葉變黃及落葉發生。430Please respect copyright.PENANAJ1UfxTy3n8
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(圖4)圖中展示出兩種導致落葉情況發生的可能性。430Please respect copyright.PENANAgIi6DBe5Dv
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這表示出每一棵樹木均有其轉化二氧化碳至氧氣的限額,並不能夠無窮無盡地吸收二氧化碳。430Please respect copyright.PENANA5VK1lj70Mu
單純依靠種植樹木意圖來改善全球的氣候變化,實際上亦有一定的限制。430Please respect copyright.PENANAlf2CZRuzyv
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有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。430Please respect copyright.PENANAXLA7EOrzgR
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https://www.instagram.com/potatopigtongue/430Please respect copyright.PENANAaJkUPHuzBS
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Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci430Please respect copyright.PENANAFAs6leVhBs