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。554Please respect copyright.PENANAmf1CR6POWV554Please respect copyright.PENANABBT9DbZMuz
554Please respect copyright.PENANA62PSlSbY6G
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。554Please respect copyright.PENANAhL0X6Hq88M
554Please respect copyright.PENANAezRTyTc7H3
(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。554Please respect copyright.PENANAnZxx1fCa9O554Please respect copyright.PENANAxIV71VlKrQ
554Please respect copyright.PENANAXueVr4IoVx
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)。554Please respect copyright.PENANAjBUS59WyJL
554Please respect copyright.PENANAlQLhbmqAYe
(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。554Please respect copyright.PENANAzQtvTsLRjt554Please respect copyright.PENANAZP7rL7SR7F
554Please respect copyright.PENANAQPmRGCce7n
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。554Please respect copyright.PENANAXD1Js5ztOo
554Please respect copyright.PENANAPWBbhWlFOE
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。554Please respect copyright.PENANAX2VdAu41YF
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。554Please respect copyright.PENANA9ARbWDaT2D
554Please respect copyright.PENANASVnta5X9g5
(圖4)圖中展示出兩種導致落葉情況發生的可能性。554Please respect copyright.PENANAzzcgMUvBPt554Please respect copyright.PENANAHQTfYeeIQj
554Please respect copyright.PENANAyc04lRZ771
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。554Please respect copyright.PENANApj8mvJsJWs
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。554Please respect copyright.PENANAYWNHQLtCfz
554Please respect copyright.PENANAVtpIbKNoZE
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。554Please respect copyright.PENANAEln7v8kQ5x
554Please respect copyright.PENANA5bMX1i3xCJ
https://www.instagram.com/potatopigtongue/554Please respect copyright.PENANAJ3LSa2MThV
554Please respect copyright.PENANAOgH8xaTFNV
554Please respect copyright.PENANAWkkeEeJcZi
Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci554Please respect copyright.PENANARMvq7fj8zX
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科普專欄–薯不揀單
作者:
薯仔聞茱莉

篇 #113
深入淺出–全球變暖反而使樹葉提前變黃
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