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。288Please respect copyright.PENANAOhMtJOvfL5
288Please respect copyright.PENANAKwzmhFaRVC
288Please respect copyright.PENANAnZ3uR2IGO1
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。288Please respect copyright.PENANAJxR69U2fHs
288Please respect copyright.PENANAX6nanu9Myu
(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。288Please respect copyright.PENANA7zR7GYtwZh
288Please respect copyright.PENANAXXAaYVx4vs
288Please respect copyright.PENANAEEAin9IagY
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)。288Please respect copyright.PENANADHlYOelvdu
288Please respect copyright.PENANAFgbDyCXuWX
(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。288Please respect copyright.PENANAUAMPYfv9cQ
288Please respect copyright.PENANAvSxM3h90Xc
288Please respect copyright.PENANA6sCl8AaFcU
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。288Please respect copyright.PENANAvoAugaCozg
288Please respect copyright.PENANAwDBcIAykbb
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。288Please respect copyright.PENANAJYeljGbgiN
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。288Please respect copyright.PENANAXysVQ83gAm
288Please respect copyright.PENANAJNbEQMlEQh
(圖4)圖中展示出兩種導致落葉情況發生的可能性。288Please respect copyright.PENANAQbzyykvfcl
288Please respect copyright.PENANA5XwbD96KvK
288Please respect copyright.PENANAhQoZIjUyOK
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。288Please respect copyright.PENANAPU2SPO4Vax
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。288Please respect copyright.PENANA9AAvWbQ51l
288Please respect copyright.PENANAVaRPH3YcEC
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。288Please respect copyright.PENANAtwI6m8znU3
288Please respect copyright.PENANAT2OMZiuR8y
https://www.instagram.com/potatopigtongue/288Please respect copyright.PENANAOgAmfHCDL9
288Please respect copyright.PENANAR7Upv7Zk08
288Please respect copyright.PENANAOY8blgOrCD
Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci288Please respect copyright.PENANAtGRBuaLCPX
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科普專欄–薯不揀單
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #113
深入淺出–全球變暖反而使樹葉提前變黃
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