摘要
为探讨巨型塑料大棚CO2环境特征,测试了早春栽培黄瓜不同时期和不同位置棚内CO2浓度的变化,对棚内CO2浓度变化随群体叶面积指数、光合速率和土壤呼吸速率的关系进行了分析。结果表明：一日中棚内CO2浓度在7：00-8：00达最高,12：00-14：00处于低谷,晴天较阴天变化剧烈。结果期一日中的8：00-15：00,光合消耗CO2速率＆gt;土壤呼吸释放CO2速率,通风可维持棚内CO2浓度在293-330μL·L^-1;棚内CO2浓度垂直分布表现为近地面层〉植株内部〉冠层,水平分布表现为10：00-12：00东部〈中部〈西部,14：00-16：00东部〉西部〉中部;棚内CO2浓度的季节变化主要受黄瓜群体叶面积指数、光合消耗CO2速率和土壤呼吸释放CO2速率的影响,晴天棚内CO2浓度白天平均下降速率与LAI（x）的关系为y=78.468x＋48.694,阴天为y=54.358x＋18.322。
To reveal CO2environmental characteristic in super-span plastic covered tunnel greenhouse, the temporal and spatial variation of CO2concentration in the greenhouse with cucumber was tested and the relationship between CO2 concentration and leaf area index （LAI） , photosynthesis rates and soil respiration rates was analyzed. The results showed that CO2 concentration reached maximum level during 7：00 -8：00 and decreased to minimum during 12：00 - 14：00 in one day. The variation of CO2 concentration was wider in sunny day comparing with that in cloudy day. Photosynthesis consumption CO2 rates was higher than soil respiration release CO2rates during 8：00 - 15：00 at fruit stage, and CO2 concentration was kept at 293 -330μL·L^-1 level by ventilation. The vertical distribution of CO2 concentration was the ground 〉 the middle 〉 the canopy. The horizontal distribution was the east 〈 the middle 〈 the west during 10.00 - 12：00, and the east 〉 the middle 〉 the west during 14：00 - 16：00. The seasonal change of CO2 concentrations were affected by LAI, canopy photosynthesis rates and soil respiration rates. The linear regression equation between average decreasing rates of CO2 concentration and LAI was y = 78. 468x ＋ 48. 694 in sunny day and y = 54. 358x ＋ 18. 322 in cloudy day.
出处
《中国农业气象》
CSCD
2009年第4期543-546,552,共5页
Chinese Journal of Agrometeorology
基金
国家"十一五"科技支撑计划(2006BAD07B04)
河南省重点科技攻关项目(0802102150002)
关键词
巨型塑料大棚
CO2浓度
叶面积指数(LAI)
土壤呼吸速率
Super-span plastic covered tunnel greenhouse
CO2 concentration
Leaf area index
Soil respiration rates
