农林业入侵杂草五爪金龙生活史特性研究

Observation on Life History Characteristics of Invasive Weed Ipomoea cairica in Agriculture and Forestry

对农林业入侵杂草五爪金龙的生活史特性进行了系统的研究，研究结果表明：厚实的种皮是引起种子自然发芽困难的主要原因，用浓硫酸、机械处理可以明显提高五爪金龙的种子萌发率；五爪金龙在子叶展开后不到2个月的时间便进入开花期，花期长，种群的开花时节是5～12月，完全枯萎期为次年的1月上旬到2月上旬，但此期木质化的茎仍然保持生命力，在接近1个月的休眠期后，次年2月又开始另一个生长季。

The life history characteristics of invasive weed Ipomoea cairica in agriculture and forestry were systematically studied in this article. The results showed that the thick seed capsule was the main reason for difficult natural germination of the seed. Concentrated sulfuric acid and mechanical treatment could obviously enhance the seed germination rate. Anthesis of Ipomoea cairica started within two months after out -spread of the cotyledon and lasted for a long time （from May to December）. The entire scorch phase was from the first ten days of January to the first ten days of February of next year, but the lignified stems still maintained their vitality. Through about one month ＇ s dormancy, a new growing season of lpomoea cairica started.