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2 不同氮水平对单作和间作玉米叶片形态特征的影响(平均值±标准偏差)

Table 2 Effects of N levels on morphological characteristics of maize leaves grown in monoculture and intercropping pattern (mean ± SD)

叶片指标 Leaf indexes	种植模式 planting pattern	氮水平 N level (kg·hm^-2)
叶片指标 Leaf indexes	种植模式 planting pattern	0 (N0)	125 (N1)	250 (N2)	375 (N3)
叶面积 Leaf area (cm²·leaf^-1)	M	308 ± 14^Aa	466 ± 26^Ab	493 ± 19^Ab	553 ± 28^Ac
	I-M	283 ± 17^Aa	478 ± 19^Ab	524 ± 13^ABb	562 ± 22^Ac
	I-P	394 ± 8^Ba	498 ± 16^Bb	549 ± 23^Bc	576 ± 12^Ac
叶干质量 Leaf dry mass (g·leaf^-1)	M	1.71 ± 0.09^Aa	2.55 ± 0.08^Ab	2.68 ± 0.10^Ab	2.86 ± 0.22^Ab
	I-M	1.19 ± 0.07^Ba	2.66 ± 0.19^Ab	2.68 ± 0.14^Ab	3.02 ± 0.19^Ac
	I-P	1.44 ± 0.11^ABa	2.90 ± 0.16^Bb	3.30 ± 0.28^Bb	3.62 ± 0.10^Bc
比叶质量 LMA (g·m^-2 )	M	55.72 ± 3.97^Aa	54.90 ± 4.22^Aa	54.41 ± 1.87^Aa	51.82 ± 4.94^Aa
	I-M	42.42 ± 5.11^Ba	58.33 ± 2.16^Abc	63.00 ± 3.86^Bb	53.78 ± 4.60^Ac
	I-P	36.65 ± 2.07^Ba	55.59 ± 4.78^Abc	62.75 ± 2.21^Bc	48.82 ± 3.76^Bb
单位质量含氮量 N_mass(g·kg^-1)	M	14.55 ± 1.30^Aa	21.62 ± 1.04^Ab	31.02 ± 0.89^Ac	34.04 ± 1.15^Ac
	I-M	15.99 ± 0.71^Aa	23.78 ± 1.03^Ab	31.17 ± 0.76^Ac	34.08 ± 0.80^Ac
	I-P	18.68 ± 0.86^Ba	24.86 ± 0.66^Ab	32.97 ± 1.23^Ac	37.12 ± 0.49^Ac
单位面积含氮量 N_area(mg·cm^-2)	M	0.42 ± 0.05^Aa	0.62 ± 0.01^Ab	0.84 ± 0.06^Abc	0.89 ± 0.06^Ac
	I-M	0.34 ± 0.03^Aa	0.69 ± 0.08^Ab	0.82 ± 0.06^Ac	0.92 ± 0.06^Ac
	I-P	0.36 ± 0.03^Aa	0.72 ± 0.05^Ab	0.91 ± 0.01^Ac	0.93 ± 0.02^Ac
光合氮利用效率 PNUE (CO₂ μmol·g^-1·s^-1)	M	49.85 ± 5.24^Aa	32.57 ± 0.48^Ab	32.73 ± 2.37^Ab	32.01 ± 2.39^Ab
	I-M	64.71 ± 6.25^Ba	31.53 ± 2.03^Ab	28.65 ± 0.23^Ab	26.32 ± 5.41^Ab
	I-P	75.58 ± 5.38^Ca	47.14 ± 5.39^Bb	39.29 ± 5.40^Bc	30.28 ± 2.06^Ad