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自然教室參考書籍

第五講.植物的繁殖方法

植物的繁殖方法分為有性繁殖無性繁殖兩大類.有性繁殖即是指以種子繁殖的播種法.無性繁殖包括扦插法,壓條法,分株法,嫁接法,孢子繁殖法,組織培養法.有性繁殖的好處是繁殖數量眾多,壽命較長,抵抗力較強;而無性繁殖則在培育幼苗時間較短,繁殖成功率高,品種原有特性容易保留.

播種法要留意種子的發芽能力,配合外界條件,如溫度,光暗,水分,通氣.亦要選擇播種時間及季節.一般購買的種子包都會清楚寫明以上的資料,種植時可要選擇適當的時候,和配合各種環境,緊記不時不種,多作嘗試,多看書本,很快便可以掌握其中要訣.(在2002年八月進行的"希望的幼苗計劃"便以播種法進行.)播種法需要健康的種子及一個頗長的培育期,但以此方法的植株較長壽及健康.

扦插法常見有枝插法,葉插法.枝插法可採用已木質化的枝莖作插穗,一段約保留三至四個節位,最頂部分在節位稍高地方斜剪一刀.(斜剪一刀可分辨上下,斜面可將水卸去)注意不要將枝條倒轉來插.枝插法是利用枝條上的養分來繁殖,沒有葉所以不需要放在陽光下,待生根長葉後便可以轉盆,一般為一個月.葉插法最常見的便是應用在非洲紫羅蘭.將整片非洲紫羅蘭葉片剪下,將葉柄插入濕沙中.注意葉面不能沾水.另外一種常見茶花繁殖,用留一葉的單芽枝插入濕沙中,待發根後才移植於盆中.扦插法中因為未有根部,較容易因脫水而枯死.

 

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