中山大学学报(自然科学版)2001，Vol.40Issue(1)：93-96,4.
两种草质藤本杂草营养生长与生殖生长研究
A Study on the Vegetation and Reproduction of Two Weedy Herbaceous Vines
摘要
Abstract
Pharbitis purpurea and lpomoea cairica are worst weeds of herbaceous vines in south China. Sexual reproduction of seed is main reproductive way of P. purpurea and asexual multiphcation of stem segnents is main reproductive way of I. cairica in south China. Fresh-ripe seed germination percentage of P. purpurea was only 0.7 %, but treated the fresh-ripe seeds with ψ = 98% H2SO4 in 25～30 minutes the gernination percentage reached 95.0% ～ 100% . The seed germination was only affected by low or high temperature. At 15 ～40 °C, the germination percentage reached 95.7%～ 99.0%, however at 10℃, only 13.7%, and at 45℃, the seeds died. Light was found to have effects on fruiting, phytoperiod of 12 hours per day had a fruiting percentage of 84.6%, and had a seed number of 12 010～15 508 square meter sample area. l. cairica grow rapidly, the growth rate reached 8.1～11.9 cm/d and it's leaf area index was 3.86. The asexual growth of stem segments reached 29.1 cmwith leaf-surface of 16.3 cm2 in 12 days. Aboveground phytomass of the plant was 3 245.3 g/m2 fresh weight in one year.关键词
圆叶牵牛(Pharbitispurpurea)/五爪金龙(Ipomoeacairica)/营养生长/生殖生长分类
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胡玉佳,王永繁..两种草质藤本杂草营养生长与生殖生长研究[J].中山大学学报(自然科学版),2001,40(1):93-96,4.
