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。459Please respect copyright.PENANARgucDybREq459Please respect copyright.PENANAId9b1NDs85
459Please respect copyright.PENANAyHtWnyWdJw
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。459Please respect copyright.PENANAA4PxmQD9By
459Please respect copyright.PENANACwZoP5YB1T
(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。459Please respect copyright.PENANACvsMW24sXd459Please respect copyright.PENANA3Fugx1UffD
459Please respect copyright.PENANAmwj57dEhzB
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)。459Please respect copyright.PENANAvDZAdFya2x
459Please respect copyright.PENANAJHmXS6IMEl
(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。459Please respect copyright.PENANAfQeNhza1hg459Please respect copyright.PENANA1t3V9zPpwv
459Please respect copyright.PENANABgC2Oma8Gm
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。459Please respect copyright.PENANAW7iCyrAKgA
459Please respect copyright.PENANAiFsuvqSRxK
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。459Please respect copyright.PENANApkikdH67ks
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。459Please respect copyright.PENANAxt1j4vca5z
459Please respect copyright.PENANAPIFyA19sfw
(圖4)圖中展示出兩種導致落葉情況發生的可能性。459Please respect copyright.PENANAKiUdoH1Z04459Please respect copyright.PENANAFRJw5jsmpT
459Please respect copyright.PENANAvPaf88Rwra
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。459Please respect copyright.PENANANfYjG9Qypb
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。459Please respect copyright.PENANA4mkm6IE4xP
459Please respect copyright.PENANAsoXGzS30h8
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。459Please respect copyright.PENANAKR9HvZwOnG
459Please respect copyright.PENANAvXkrtzsdH7
https://www.instagram.com/potatopigtongue/459Please respect copyright.PENANAanZGK7Qn8M
459Please respect copyright.PENANAyqXOxwC5X0
459Please respect copyright.PENANAjDzZnOTtPa
Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci459Please respect copyright.PENANAVLjJXE7U4t