三种豆科植物光合特征初步研究

A Premilentary Study on Photosynthetic Characteristics in Three Leguminous Forage Species

以山核桃林地栽植的3种常见豆科牧草白三叶(Trifolium repens Linn.)、紫云英(As-tragalus sinicus L)和紫花苜蓿(Medicago sativa L.)为对象,利用Li-6400便携式光合仪对其植物叶片的气体交换参数进行了测定。结果表明,白三叶的光补偿点和光饱和点均最大,分别为24.16μmol/m2·s、758.00μmol/m2·s,明显高于其它2个种;3种牧草的最大净光合速率同样存在显著性差异,其中白三叶为23.58μmol CO2/m2·s,显著高于其它2个种(分别为10.55μmol CO2/m2·s、10.70μmol CO2/m2·s),说明了白三叶具有较强的光合能力。

The gas exchange in leaves of three common Leguminous forages species in Carya cathayensis orchard including Trifolium repens Linn. , Astragalus sinicus L. , Medicago sativa L.. were measured by using Li-6400 portable photosynthesis system. The results showed that the light compensation point and light saturation point were 24.16μmol/m2 · s, 758.00μmol/m2 · s respectively in Trifolium repens Linn, great higher than other two species. In addition, there was a significant difference on maximum net pho- tosynthetic rate among these leguminous forage species. 23.58μmol C02/m2 · s Trifolium repens Linn was higher significantly than other two species （10.55μmol C02/m2 · s and 10.70μmol C02/m2· s re- spectively）. In conclusion, there was a stronger photosynthetic capacity in Trifolium repens Linn among three leguminous forage species.