科普專欄–薯不揀單 - 深入淺出–全球變暖反而使樹葉提前變黃

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。553Please respect copyright.ＰＥＮＡＮＡN3T1JLuDGA
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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。553Please respect copyright.ＰＥＮＡＮＡDkkMI0rN3J
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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。553Please respect copyright.ＰＥＮＡＮＡH9vpIce7Pg
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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)。553Please respect copyright.ＰＥＮＡＮＡt2nIOOckbP
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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。553Please respect copyright.ＰＥＮＡＮＡeiGMx8eMnf
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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。553Please respect copyright.ＰＥＮＡＮＡqLXpAcF1Ks
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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。553Please respect copyright.ＰＥＮＡＮＡxPU1y6upBd
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。553Please respect copyright.ＰＥＮＡＮＡdDeHqttGUR
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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。553Please respect copyright.ＰＥＮＡＮＡk1J2onN1jl
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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。553Please respect copyright.ＰＥＮＡＮＡpokL34qBJh
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。553Please respect copyright.ＰＥＮＡＮＡ6FPHP4k7Lp
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。553Please respect copyright.ＰＥＮＡＮＡjws8dEBCde
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https://www.instagram.com/potatopigtongue/553Please respect copyright.ＰＥＮＡＮＡWlleBhHVCi
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Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci553Please respect copyright.ＰＥＮＡＮＡsG1Hg3G0Ip

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