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以白三叶、光叶紫花苕、一年生黑麦草、多年生黑麦草、紫花苜蓿5种牧草为试验测试对象,采用LI-6400便携式光合测定系统分别测定椒—草种植模式下5种牧草在生长盛期的净光合速率(Pn),以探讨不同牧草的光合生理特性.试验结果表明:不同牧草的净光合速率日变化特征参数存在明显差异,苜蓿和一年生黑麦草的净光合速率日变化呈双峰曲线,有“午休”现象;白三叶、多年生黑麦草、光叶紫花苕没有“午休”现象;净光合速率值对光照日变化的反应差异也较大,在生产中需要调整花椒林冠层分郁闭度以便营造适宜不同牧草生存的林下光环境,既达到坡地植被水土保持效益,又满足花椒经济林和牧草生产两不误的植被建设需求.
Five species of forage, white clover, light violet foxtail, annual ryegrass, perennial ryegrass and alfalfa, were used as test objects. LI-6400 portable photosynthesis system was used to measure the growth of 5 species of grass in the pepper- (Pn) to explore the photosynthetic physiological characteristics of different forages.The results showed that there were significant differences in the diurnal variation of net photosynthetic rate among different forage species, and the diurnal variation of net photosynthetic rate of alfalfa and annual ryegrass showed a double peak Curvilinear, “lunch break ” phenomenon; white clover, perennial ryegrass, Halibut chrysalis no “lunch break ” phenomenon; net photosynthetic rate of light on the diurnal variation of the response is also greater in the production needs to be adjusted Capsicum canopy density canopy in order to create a forest environment suitable for the survival of different grasses, not only to achieve the benefits of slope soil and water conservation, but also to meet the economic development of pepper and forage grass production needs of vegetation.