花椒树下苜蓿、百脉根和白三叶的光合生理生态特性研究

Study on photosynthetic physical and ecological characteristics of alfalfa,bird foot trefoil and white clover growing under Chinese prickly ash tree

为科学指导林草复合中对林下间作牧草的选择,运用美国LI-COR公司制造的LI-6400便携式光合测定系统,研究了白三叶Tritolium repens、苜蓿Medicago sativa和百脉根Lotus corniculatus在林草间作时的光合生理生态特性,探讨三者在林下间作的生态适应性。结果表明:白三叶、苜蓿和百脉根净光合速率(Pn)和气孔导度(Gs)的日变化均为双峰曲线,2个峰值分别出现在11:00和15:00左右。3种植物的Pn与Gs都具有显著相关关系,且叶片温度(Tl)与蒸腾速率(Tr)呈极显著正相关关系。

The photosynthetic physical and ecological characteristics of alfalfa, bird foot trefoil and white clover growing under Chinese prickly ash tree were studied using Li-6400 portable photosynthesis system made by LI-COR company. The results indicated that daily variation of net photosynthesis rate （Pn）,and stomata conductance （Gs） of three forage species showed a double-apex curve with two apex at 11：00am and 15：00pm, alfalfa had higher apex that the other species. Net photosynthesis rate （Pn） and stomata conductance （Gs） of the three species were significantly correlated, leaves temperature（T1） and transpiration rate（Tr） also significantly correlated.