摘要
不同季节日光温室内的生态环境差异很大。与春季适宜黄瓜生育的生态环境相比较，冬季日光温室内光照时间短，强度弱，黄瓜净光合速率低，为单峰曲线，而春季则为双峰曲线。从功能叶片活体叶绿素ａ荧光诱导动力学曲线看出，反映碳同化酶活性的Ｍ峰，冬季比春季明显程度低，但品种间有差异，长春密刺的Ｍ峰最明显，对弱光耐受力强，生育表现也较健壮，农大１４居中，津杂２号Ｍ峰几乎消失。不同季节日光温室内的温度环境。对黄瓜光合作用影响最大的是适温持续时间长短。光照与温度比较，对黄瓜光合作用影响更大是光环境，试验结果还揭示出耐低温的黄瓜品种如农大１４（Ｆ１）并不一定耐弱光。不同季节日光温室内ＣＯ２浓度以冬季变化激烈，应进行气体施肥补充ＣＯ２。
The environment in solar-greenhouses varied much in different seasons. In spring, the internal environment was favourable to the growth of cucumbers, while in winter, the lighting period was shorter and the photo flux density was lower. Under winter conditions, the average net photosynthetic rate (Pn) showed a typical curve with one peak, in comparison with the double peaks under spring conditions. Cucumber functional leaves under different conditions were measured in vivo in order to evaluate the kinetics of 685 chlorophyll fluorescence induction.Results indicated that the M peak in the induction curve that reflected the activity of the assimilation enzyme was less clearer in winter than in spring. It was also found that among different cucumber varieties, the M peak of Changchunmici was the clearest, followed by Nongda 14, while that of Jinza 2 almost could not be seen. In sotar-greenhouses, irradiance affected photosynthesis more than temperature, and the sustained period of suitable temperatrue contributed mostly to photosynthesis. According to the results, the cucumber varieties that were tolerant to low temperature like Nongda-14 might not necessarily tolerate to low irradiance. In winter, the CO2 concentration in the solar-greenhouse during the day Varied more violently than in spring, so it would be necessary to supplement CO2 gas.
出处
《华北农学报》
CSCD
北大核心
1995年第1期70-75,共6页
Acta Agriculturae Boreali-Sinica
