大棚瓠瓜CO2加富的生理生态效应

春季对大棚瓠瓜增施CO₂,可促进植株的生长发育.株高、茎粗增幅分别达到3.90%～19.48%和11.58%～27.37%,叶片厚度及叶面积也分别增加38.46%～69.23%和26.09%～49.38%;第一雌花着生节位平均降低2.6～4.0节.平均单果重增加4.05%～19.62%,产量提高8.65%～19.47%.在1000μmol·mol^-1范围内,CO₂浓度每增加100μmol·mol^-1,单果重和产量分别增加31.97g和68.39kg·667m^-2;第一雌花着生节位降低0.35节.在1000μmol·mol^-1浓度下,瓤瓜光合速率和羧化速率均达最高值.春季大棚瓠瓜CO₂适宜施用浓度为1000μmol·mol^-1左右.

Ecophysiological effects of CO2 enrichment on bottle gour in plastic house

In vegetable growing under protection, lack of carbon dioxide is one of the most important factors limiting photosynthesis. The application of 600～1200 μmol·mol^-1 CO₂ in the plastic house increased photosyntheitc rates and ratio of C/N, promoted both vegetative and reproductive growth of bottle gourd plants. Plant height, stem diameter, leaf thickness and leaf area increased by 3.90～19.48%, 11.58～27.37%, 38.46～69.23% and 26.09～49.38%, respectively. Average single fruit weight and yield were 4.05～19.62% and 8.65～19.47% higher than that in normal air. Primary female flower position was lowered by 2.6～4.0. Net photosyntheitc rate and the carboxylase activity of RuBP were greatest under CO₂ 1000μmol· mol^-1. The optimal concentration of CO₂ applied to bottle gourd in spring was about 1000 μmol·mol^-1.