2013年11月21日 星期四

樹之謎(by Veritasium‎)

翻譯作品。影片右上角可切換字幕顯示(CC)與畫質(HD)。

爬山的時候,大家會不會覺得「樹居然能長這麼高,超級詭異」呢?

「這有什麼好詭異的?樹天生就高啊。」

可是你知道嗎?物理告訴我們:如果你用一條超長吸管吸水,你最高只能吸到10公尺高。但是,很多神木可以長超過一百公尺,水份可以一路運到最頂端的枝葉。

這究竟是什麼巫術?接下來,就是見證並破解奇蹟的時刻~



--
身為顯性樹控,我不得不翻。
⋯⋯樹啊,真不枉我傾盡一生來愛你。

6 則留言:

  1. 這部影片真是太不可思議了~!
    越簡單的問題,答案越奇妙阿

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  2. 請問,我可以把這片的連結

    整個搬到FB上 "搶救華光老樹群"&"台灣護樹團體聯盟" 這兩個頁面嗎?

    拜託~!!

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    1. 當然歡迎。連結這麼輕巧,copy&paste即可。如果你指的是整個影片連字幕內嵌到其他網站,這需要header語碼。

      原youtube影片就有較容易執行的內嵌語碼,也有中譯字幕,只不過句意破碎較不易讀。

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  3. 呼叫樹控,有看過這篇嗎?
    http://e-info.org.tw/node/96989

    最近花了兩個月,把溫州社區全部的樹籍資料調查出來了,共有800多棵
    最近整理好後,會在社區的網站上公布,谷哥地球的標點紀錄檔。

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    1. "自然(Nature)"的原文出處連結,有附圖與References
      Rate of tree carbon accumulation increases continuously with tree size
      www.nature.com/nature/journal/vaop/ncurrent/abs/nature12914.html

      轉自Fu Yo-kui
      前天剛發表於國際頂尖期刊"自然(Nature)"的研究:"樹木的固碳效率隨其成長而持續增加",推翻了前幾天在臉書上傳的所謂"砍大樹作為木材使用並種小樹才是有效固碳作法"的論點
      摘要如下:

      Forests are major components of the global carbon cycle, providing substantial feedback to atmospheric greenhouse gas concentrations. Our ability to understand and predict changes in the forest carbon cycle—particularly net primary productivity and carbon storage—increasingly relies on models that represent biological processes across several scales of biological organization, from tree leaves to forest stands. Yet, despite advances in our understanding of productivity at the scales of leaves and stands, no consensus exists about the nature of productivity at the scale of the individual tree, in part because we lack a broad empirical assessment of whether rates of absolute tree mass growth (and thus carbon accumulation) decrease, remain constant, or increase as trees increase in size and age. Here we present a global analysis of 403 tropical and temperate tree species, showing that for most species mass growth rate increases continuously with tree size. Thus, large, old trees do not act simply as senescent carbon reservoirs but actively fix large amounts of carbon compared to smaller trees; at the extreme, a single big tree can add the same amount of carbon to the forest within a year as is contained in an entire mid-sized tree. The apparent paradoxes of individual tree growth increasing with tree size despite declining leaf-level and stand-level10 productivity can be explained, respectively, by increases in a tree’s total leaf area that outpace declines in productivity per unit of leaf area and, among other factors, age-related reductions in population density. Our results resolve conflicting assumptions about the nature of tree growth, inform efforts to undertand and model forest carbon dynamics, and have additional implications for theories of resource allocation and plant senescence.

      Fu Yo-kui "large, old trees do not act simply as senescent carbon reservoirs but actively fix large amounts of carbon compared to smaller trees; at the extreme, a single big tree can add the same amount of carbon to the forest within a year as is contained in an entire mid-sized tree."

      巨大的老樹並非僅僅像是一座衰老的碳儲藏庫,它能比小樹固定更大量的碳。當效率達到極致時,單獨的一棵大樹能在一年內固定與一座由中型樹木所組成的森林相同的碳量。

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