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。530Please respect copyright.ＰＥＮＡＮＡg4WhRxoPTI
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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。530Please respect copyright.ＰＥＮＡＮＡ5bMkNdlxE7
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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。530Please respect copyright.ＰＥＮＡＮＡYM0hLWVfwW
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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)。530Please respect copyright.ＰＥＮＡＮＡtjnTErbfYT
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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。530Please respect copyright.ＰＥＮＡＮＡdpKpc6Fsap
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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。530Please respect copyright.ＰＥＮＡＮＡB0TeGNUfba
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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。530Please respect copyright.ＰＥＮＡＮＡhICLW8LGK5
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。530Please respect copyright.ＰＥＮＡＮＡaf9TuYF4Y8
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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。530Please respect copyright.ＰＥＮＡＮＡmE9HdiW2WA
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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。530Please respect copyright.ＰＥＮＡＮＡKJpSCf8djR
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。530Please respect copyright.ＰＥＮＡＮＡJj5EGZ5dfw
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。530Please respect copyright.ＰＥＮＡＮＡuoX9pnWRw3
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https://www.instagram.com/potatopigtongue/530Please respect copyright.ＰＥＮＡＮＡioocqMMlgW
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Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci530Please respect copyright.ＰＥＮＡＮＡGYZI04hdi7
8964 copyright protection526ＰＥＮＡＮＡl5H0QHBR6Q 維尼

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