不同生长年限紫花苜蓿光能和水分利用效率的研究

Study on Light and Water Utilization Efficiency of Different Growing Year Alfalfa

2007年4～10月在地处西辽河平原的内蒙古民族大学实验农场对栽培条件相近的4个不同生长年限紫花苜蓿光合特性进行了研究.结果表明,2年生紫花苜蓿瞬时光能利用率在第1茬、第2茬、第3茬中均明显高于3年生、4年生和6年生紫花苜蓿,而在第4茬中与其它各生长年限间差异不大;瞬时水分利用率以2年生紫花苜蓿较高,6年生较低,这种差异在午后表现更为明显;各生长年限紫花苜蓿瞬时光能利用率和瞬时水分利用率均表现为上午高于下午.

The study on photosynthetic characteristic of four different growing years alfalfa with similar cultivation conditions was carried on on a experimental farm of the Inner Mongolia University for Nationalities in Xiliaohe Plain from April to October in 2007. The results showed that, in the former three stubble, the instantaneous light utilization efficiency of two-year alfalfa was obviously higher than that of three-year, four-year and six-year alfalfa, but in the last stubble, the differences among different growing year were not obvious; the instantaneous water utilization efficiency of two-year alfalfa was higher but six-year alfalfa was lower, especially in the afternoon;the instantaneous light utilization efficiency and the instantaneous water utilization efficiency among different growing year in the morning were higher than that in the afternoon.