间作对氮调控玉米光合速率和光合氮利用效率的影响

朱启林,向蕊,汤利,龙光强

Effects of intercropping on photosynthetic rate and net photosynthetic nitrogen use efficiency of maize under nitrogen addition

Qi-Lin ZHU,Rui XIANG,Li TANG,Guang-Qiang LONG

表3 不同氮水平对间作玉米净光合速率(Pn)、单位面积叶片含氮量(Narea)及光合氮利用效率(PNUE)的影响

Table 3 Effects of intercropping pattern on net photosynthetic rate (Pn), nitrogen content per unit area (Narea) and photosynthetic nitrogen use efficiency (PNUE) of maize leaves grown under different nitrogen levels

氮水平 N rate (kg·hm-2) Pn (%) Narea (%) PNUE (%) M I-M I-P M I-M I-P M I-M I-P 0 (N0) - - - - - - - - - 125 (N1) -1.8 4.8 16.2 50.2 116.5 86.8 -34.7 -51.3 -37.6 250 (N2) 28.8 18.8 32.5 98.6 172.1 158.6 -34.3 -55.7 -48.0 375 (N3) 27.6 28.9 -3.0 101.9 174.9 173.5 -35.8 -59.3 -59.9