日光温室内黄瓜群体结构参数分析

Analysis of Cucumber Canopy Architectural Parameters in Sunlight Greenhouse

日光温室由于其特殊的光环境，黄瓜群体结构也具一定的特殊性，试验观测了日光温室内南北部的光环境及黄瓜不同生育时期的群体结构参数。结果表明：日光温室内南部的辐射强度明显高于北部，黄瓜的叶倾角、叶方位角、叶面积指数、叶面积密度等黄瓜群体结构因素在不同时期有明显的变化。植株南面叶片的叶倾角大于植株北面叶片的叶倾角。在整个生育期黄瓜以30°～40°叶倾角的叶片为分布主体。植株南面方位角分布频率也高于植株北面的方位角分布频率。叶面积指数和叶面积密度在生育前期上升，后期下降，这些变化与差异对黄瓜群体内的辐射分布有重要影响，所以此结果为探讨日光温室内的黄瓜群体结构与群体内辐射分布的关系和建立群体内辐射分布的数学模型奠定了基础。

Becaus of the particular light environment, the canopy architectural of cucumbers has certain particularity. The thesis observed the light environment in the north and south part of the light greenhouse and the canopy architectural parameters on different bearing periods. The results showed, the radiant intensity in the south part is obviously higher than that in the north part; the cucumber leaf zenith, azimuth angles, leaf area index and leaf area density changes distinctly on different periods. The leaf zenith that in the south was bigger than that in the north,and during the whole bearing period, the distribution of leaf zenith was mainly about 30°-40°. The frequency of leaf zenith in the south was higher than that in the north.. The leaf area index and leaf density increase during early bearing period, while decreases during late bearing period. All these changes and differences had great influence On the distribution of radiation that inside cucum- bers. Therefore, the result lald a foundation for discussing the relationship between cucumber canopy architectural in greenhouse and the distribution of radiation inside cucumbers, meanwhile, the result laid a foundation for building the math model of the radiation distribution inside cucumbers.