日光温室黄瓜栽培CO_2浓度的消长规律初探

近 3a(年 )的研究结果表明 :日光温室内CO2 浓度有明显的季节变化和日变化。在整个生长期内因通风时间和通风量的不同 ,日光温室内的CO2 浓度 11月和 3月较高 ,5月较低。各时期日变化基本相同 ,但变化幅度因季节而异 ,上午随Pn的逐渐增大而下降 ,中午 12 :0 0～ 14 :0 0时降至最低 ,下午又随Pn的减小而缓慢回升。叶片的光合作用、呼吸作用和土壤呼吸是影响日光温室内CO2 浓度日变化的主要因素。有机肥施用量对室内土壤呼吸和日光温室CO2 浓度有较大影响 ,在有机肥充足的条件下 ,室内CO2 浓度基本满足黄瓜光合作用的需要 ,无须补施 ,如果在作物生长期间再定时随水向土壤中冲施有机肥 ,效果就更好

Prelimiary Study on Dynamic Changing of CO2 Concentration in Sola Lean to Greenhouse During the Cultivation of Cucumber

On the basis of three years research work,the results showed that the seasonal and diurnal variation of CO 2 concentration in solar lean to greenhouse was obvious during the cucumber growth. CO 2 concentration was higher in November and March and lower in May. The pattern of diurnal variation of CO 2 concentration among seasons was similar,decreased with the increasing of photosynthetic and reached the lowest at 12:00-14:00 PM,then increased with the decreasing of photosynthesis. The major factors affecting CO 2 diurnal change were photosynthesis,respiration of leaf and microorganism activity in soil. Organic fertilizer greatly affects CO 2 concentration in solar greenhouse. With sufficient organic fertilizer,CO 2 concentration in solar greenhouse meets basically the need of cucumber growth so that it is unnecessary to add additonal CO 2 fertilizer.