科普專欄–薯不揀單 - 三十秒科學–種樹是否一定能夠減低大氣二氧化碳含量？

人為活動產生不少溫室氣體，助長了全球氣候極端化的發生。不少國家亦開始提倡碳中和及減碳排放方案，務求可為下一代提供良好的環境生長。519Please respect copyright.ＰＥＮＡＮＡJ8WPQabvuT
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除減少排放外，如何消除大氣的溫室氣體亦是一個重要課題;519Please respect copyright.ＰＥＮＡＮＡnfQMCt1MrF
現今相信約有30%人為活動所排放的二氧化碳將經由陸地的生態環境從大氣中移除開去。519Please respect copyright.ＰＥＮＡＮＡBw17BtoHdk
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(圖2)植物的光合作用，能夠將大氣的二氧化碳轉化成為植物內部的碳水化合物。519Please respect copyright.ＰＥＮＡＮＡt7UlAKX9Yc
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換句話說，植物能夠減低大氣間的二氧化碳，皆因它們能夠將二氧化碳氣體的碳原子轉換成為固體的碳原子狀態，把它們收藏在自身身體。519Please respect copyright.ＰＥＮＡＮＡrwwmR2kyhf
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那麼，是否只要瘋狂種樹，就能夠減低大氣的二氧化碳濃度，順利解決二氧化碳方面的問題呢?519Please respect copyright.ＰＥＮＡＮＡqYFW7JbAqz
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(圖3)最近有研究發現，草叢移除大氣二氧化碳的能力有可能會較大樹的為好。519Please respect copyright.ＰＥＮＡＮＡeZ4gpKX1t3
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雖然大樹本身能夠儲存碳水化合物的能力比草叢的為高，但為了持續供應大樹生長的所需，其根部會聯合各種細菌或生物來獲取泥土的營養，這過程中將會將泥土的碳原子以二氧化碳氣體釋放出去。519Please respect copyright.ＰＥＮＡＮＡxzurbIZRW3
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在部份實驗例子中，大樹不但沒能有效移除大氣二氧化碳，倒反而是增長了大氣二氧化碳含量。519Please respect copyright.ＰＥＮＡＮＡM14vZxzs3E
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如何平衡草叢及大樹種植的比例來獲取減滅二氧化碳的最大收益，將是重要的環保課題。519Please respect copyright.ＰＥＮＡＮＡvAVzqgSS5D
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。519Please respect copyright.ＰＥＮＡＮＡyPnYAJyH45
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio519Please respect copyright.ＰＥＮＡＮＡLGsRjYErhj
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