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    作文網,小學生作文,初中作文,高中作文,作文題材大全!

    沙漠地黃的自救

    編輯:作文網 | 來源:勵志故事

    以色列沙漠地區有一種綠色植物叫沙漠地黃,它在長期干旱的環境中可以長出碩大的葉片,開出美麗的花朵,為荒蕪的沙漠增添了少有的亮色。沙漠地黃之所以有如此頑強的生命力,奧妙在于它自身有一套自我收集微弱水汽并進行灌溉的生物系統。它碩大的葉子上面有一層蠟狀物質,葉片緊貼著根部四散生長,葉子表面疙疙瘩瘩,而且有許多“溝壑”……別看它其貌不揚,但每個特點都是系統中的重要環節,比如,突出的“疙瘩”就是用來收集空氣中微量的水汽,這些水汽在“疙瘩”上聚集成小水滴,達到一定程度后,自然順著“溝壑”直接灌溉根部。

    以色列海法大學教師尼爾曼對這種奇特的沙漠植物十分感興趣,他很想知道,如果破壞了這種特殊結構,沙漠地黃的生命力會怎么樣?于是他做了一個實驗:先找到一株沙漠地黃,并在其所有葉片的根部加裝導水片,也就是讓葉片收集的流向根部的水不能到達根部。幾天后,沙漠地黃呈現了枯萎的狀況。尼爾曼很失望,看來,沒有水的滋潤,任何生物在沙漠里生存都會困難異常。可令他沒想到的是,奇跡出現了。幾天后,這株沙漠地黃的葉片迅速枯死,而在根部重新萌發了新的葉片芽,緊接著葉片芽以上的部分包括莖部都快速枯萎,似乎整株沙漠地黃的能量都集中于葉片芽的生長上。葉片芽長勢特別快,一個星期后,整株沙漠地黃在新芽的快速成長并工作后,漸漸恢復了往日的生機,而且很快開出了美麗的花朵。

    沙漠地黃果敢地切斷受傷部位的給養而全力催生新葉片,給了我們很多啟示。當強大的災難破壞了我們賴以生存的基礎,我們往往是千方百計、費盡周折去維持、彌補、修復。有多少人能做到敢于舍棄,從頭再來開創新開地呢?

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