jimmy 發問於 科學及數學生物學 · 1 十年前

為什麼野草能生長在山坡地上

在山坡地上沒有種子,也沒有養份,為什麼野草可以在這樣的情況下生長呢?

1 個解答

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  • ?
    Lv 5
    1 十年前
    最愛解答

    首先要講清楚, 野草係weed, 而草係grass

    野草其實係所有我地唔想佢生長但係佢又生到出黎既植物,唔一定係草, 不過好多時都係一d草之類既植物

    答左點解沒有種子都可以生長先:

    個原因就係其實係有種子o係山坡既泥土裡面, 因為草係用風去傳播種子,而且可以留o係泥土裡面等到合適既時候生出黎, 所以這個唔係問題~

    沒有養份都可以生長?

    唔係冇, 只係少d養份o者, 但唔好忘記, 草係地球上其中一種生命力最強既生物, 佢可以o係熱帶雨林,沙漠, 寒冷既高原上生長都冇問題,山坡係小兒科啦, 而wikipedia對weed有咁既description:

    ....the weedy nature of these species often gives them an advantage over more desirable crop species because they often grow quickly and reproduce quickly, have seeds that persist in the soil seed bank for many years, or have short lifespans with multiple generations in the same growing season. Perennial weeds often have underground stems that spread out under the soil surface or, like ground ivy (Glechoma hederacea), have creeping stems that root and spread out over the ground. A number of weedy species have developed allelopathy, chemical means to prevent the germination or growth of neighboring plants.

    大概既意思,草有咁強既生命力,主要既原因就係:

    1. 佢生得比其他植物快

    2. 佢既種子可以o係泥土中留好多年都唔死

    3. 佢好快就可以繁殖下一代, 可以出現同一個時間幾代同堂

    4. 佢既根可以o係泥土下或者泥土上蔓延出去,咁就乾都唔怕啦

    5. 有d野草可以放一d化學物質出黎影響其他植物生長

    d草咁勁, o係山坡度生長冇問題啦~

    就係咁~

    資料來源: I graduated in Biochem
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