在樹幹上的潛伏芽
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樹幹內發生病變,樹木會在腐朽處旁產生形成層隔離壁,而外面則繼續生長癒合封鎖。
紅點為在樟樹木材上的形成層隔離壁
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形成層防禦層
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黑色部份為腐朽材,周圍產生形成層防禦層。
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修剪側枝,導致發生腐朽,但側枝有枝條保護區(branch protection zone),所以潰爛至此就停了。
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修剪側枝之後,形成層形成新樹皮癒合
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修剪得當的側枝,癒合完整
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美人樹雖然中空,但外圍形成窗框材,加強樹幹的力學結構
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正面觀察上面那張圖,有缺陷的部份,外觀會膨脹,就像是窗框一樣。
![](http://static.flickr.com/7046/6895784266_2e6db24cac.jpg)
發生中空的榕樹,兩側形成窗框材
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左方紅點是「懸臂髓心樁」,是從小就生長的結構枝,經過一年一年的包覆之後所形成
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樹幹內部發生腐朽的時候,樹木採用的方式是將內部腐朽處隔離,外圍則癒合。
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樹皮缺損之後,兩側樹皮生長膨大,加強力學結構
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闊葉樹屬於拉拔材,枝條的年輪上方較寬
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拉拔材的樹木,樹根會往傾斜的另外一側生長。以下圖為例,樹幹往左方傾斜,因此樹根往右方生長。
![](http://static.flickr.com/7275/6895814562_2981d0b665.jpg)
針葉樹的肖楠屬於支撐材,枝條則是下方年輪較寬
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樟樹發生雙主幹,中間發生夾皮
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「懸臂髓心樁」的結構
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「懸臂髓心樁」的結構,可見纖維緊密包覆
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「懸臂髓心樁」的結構,直連髓心
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紅點處為環枝組織,注意纖維走向
![](http://static.flickr.com/7279/7041891313_ce26ab9bf7.jpg)
和髓心相連的側枝
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![](http://static.flickr.com/7238/6895796364_b86ca5ce06.jpg)
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紅點處為環枝組織
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刺桐的根系,擺設時刻意倒置,看起來就像是一樹冠,其實是根系。
![](http://static.flickr.com/7106/7041896547_cbd8f507f8.jpg)
肖楠的根系(倒置),可見大多數的根系都是在淺層
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V字夾角枝,中間發生夾皮
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U型夾角枝,不會有夾皮
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斷頭後產生多主幹
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接觸生長,自己和自己癒合
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接觸生長,和環繞的藤蔓癒合
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鳳凰木盤根錯節的根系,自己甚至會和自己癒合
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樹木經斷頭之後,萌發許多不定芽,生成許多非結構枝的直立枝條。
![](http://static.flickr.com/7139/6895815086_c4b9373ac9.jpg)