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研究了9个陆地棉品种(品系)的冠层结构和不同层次叶片的光合速率。试验结果表明:适度地增大上层主茎节距、降低角度指数和上层叶片所占比例,有助于冠层消光系数的减小和透光条件的改善,上层叶和中下层叶的光合特性有所不同,在弱光下后者的光合速率比前者高,在强光下比前者低。作者对适合于四川棉区生态条件的合理株型结构提出了设想。
The canopy structure and leaf photosynthetic rate of nine Upland cotton cultivars (lines) were studied. The results showed that: moderately increasing the pitch of the upper stem, reducing the angle index and the proportion of the upper leaves contributed to the decrease of the extinction coefficient of the canopy and the improvement of the light transmission, the photosynthetic characteristics of the upper and lower leaves The difference is that in the low light, the latter’s photosynthetic rate is higher than the former and is lower under the glare than the former. The author put forward the idea of a reasonable plant-type structure suitable for ecological conditions in Sichuan cotton area.