Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Anonymous
Anonymous asked in 科學其他:科學 · 2 decades ago

年輪是什麼??

年輪是什麼...

3 Answers

Rating
  • Anonymous
    2 decades ago
    Favorite Answer

    你好:有人用紙和筆寫日記,有人用照片寫日記,而樹木則以年輪來寫日記。樹木因週期性的生長,而在其橫斷面圍繞著髓心(pith)形成同心圓狀的木質部層次,我們叫它為生長層(growth layer),其斷面稱為生長輪(growth ring)。在暖溫地帶所生長之樹木,因四季較為分明,通常一年僅具有一個生長週期,與前述之生長層及生長輪相互對應,因此我們稱之為年輪層(annual layer)及年輪(annual ring)。

    Source(s): 胖可魯媽媽˙_˙ 僅供 參考 !參考!
  • Anonymous
    2 decades ago

    年輪就是樹中間的那一個枝幹~

    叫年輪的原因是~夏冬的雨量不同~因為他的細胞分裂就會有快有慢~因此可以用來計算樹的年齡~而越熱帶地區的年輪越不明顯~

    記憶上解釋~

    Source(s): wadasi
  • 年輪是樹幹裡面的東西~~

    如果你迷路...聽說剛好如果有砍掉的樹幹在旁邊的話!!

    聽說...看他的年輪就可以知道怎摸走...

    還有~~年輪是指一棵樹德年齡...

    所以你也能看出年齡喔!!

    Source(s): 自己!
Still have questions? Get your answers by asking now.