节水灌溉的水稻冠层结构研究

根据国家“863”节水农业专项子课题现场试验资料．分析了控制灌溉和常规灌溉条件下水稻的冠层叶面积指数、平均叶倾角、散射辐射透射系数、直射辐射透射系数、消光系数和叶分布等冠层指标。结果表明．通过对土壤水分的合理调控．控制灌溉模式的水稻株型合理,散射辐射透射系数较大．直射辐射透射系数从上层至下层逐渐减小,消光系数从上层至下层逐渐增大．有利于光的向下透射和光的截获．为水稻高产奠定了基础。

Study on Canopy Characteristics of Rice under Different Water Supplies

Based on the field experiment, some canopy indexes of rice,such as canopy leaf area index(CLAI), mean foliage inclination angle(MFIA), transmission coefficient for diffuse radiation (TD), transmission coefficient for solar beam radiation penetration (TR), extinction coefficient(K) and leaf distribution(LD) under controlled irrigation and traditional irrigation, were analyzed in this paper. The result indicated that through adjusting water layer and soil moisture reasonably in paddy fields, the nicer plant type was formed under controlled irrigation, TD was higher than that of traditional irrigation, TR decreased gradually from upper layer to lower layer, on the contrary, K increased gradually from upper layer to lower layer, which were beneficial to light transmission and interception to get high yield.