氮肥和种植密度对达乌里胡枝子的生长与生物固氮的影响

王银柳, 耿倩倩, 黄建辉, 王常慧, 李磊, 哈斯木其尔, 牛国祥

Effects of nitrogen addition and planting density on the growth and biological nitrogen fixation of Lespedeza davurica

WANG Yin-Liu, GENG Qian-Qian, HUANG Jian-Hui, WANG Chang-Hui, LI Lei, HASI Muqier, NIU Guo-Xiang

表1 不同氮肥和种植密度处理下达乌里胡枝子的生长指标(平均值±标准误)

Table 1 Growth indexes of Lespedeza davurica under different levels of nitrogen addition and planting density treatments (mean ± SE)

处理 Treatment	水平 Level	株高 Height (cm)	总生物量 Total biomass (g)	总地上生物量 Total aboveground biomass (g)	总地下生物量 Total belowground biomass (g)	平均地上生物量 Average aboveground biomass (g·Ind.^-1)	平均地下生物量 Average belowground biomass (g·Ind.^-1)	根冠比 Root:shoot ratio	叶片C含量 Leaf C concentration (%)
施氮 N addition (g·m^-2·a^-1)	0	58.69 ± 2.14 ^ns	11.79 ± 1.02 ^b	8.94 ± 0.72 ^c	2.84 ± 0.32 ^b	3.61 ± 0.47 ^b	1.06 ± 0.13 ^b	0.31 ± 0.02 ^b	45.26 ± 0.34 ^b
	5	58.49 ± 1.90 ^ns	15.43 ± 1.02 ^a	11.24 ± 0.64 ^bc	4.20 ± 0.39 ^a	4.93 ± 0.76 ^a	1.67 ± 0.22 ^a	0.36 ± 0.02 ^a	45.99 ± 0.35 ^a
	10	62.56 ± 2.43 ^ns	15.76 ± 1.04 ^a	11.99 ± 0.77 ^a	3.76 ± 0.32 ^a	5.20 ± 0.80 ^a	1.60 ± 0.25 ^a	0.31 ± 0.02 ^b	45.98 ± 0.32 ^a
	20	63.32 ± 2.61 ^ns	15.37 ± 1.02 ^a	11.52 ± 0.7 ^ab	3.86 ± 0.33 ^a	4.91 ± 0.67 ^a	1.51 ± 0.17 ^a	0.33 ± 0.01 ^ab	45.95 ± 0.26 ^a
密度 Planting density (Ind.·pot^-1)	1	77.53 ± 4.43 ^a	10.01 ± 0.62 ^b	7.80 ± 0.45 ^b	2.20 ± 0.19 ^b	7.81 ± 0.45 ^a	2.20 ± 0.19 ^a	0.28 ± 0.01 ^b	46.29 ± 0.09 ^a
	3	61.56 ± 1.60 ^b	16.54 ± 0.62 ^a	12.20 ± 0.46 ^a	4.34 ± 0.19 ^a	4.07 ± 0.15 ^b	1.45 ± 0.06 ^b	0.36 ± 0.01 ^a	46.69 ± 0.24 ^a
	6	57.53 ± 1.42 ^b	17.50 ± 0.55 ^a	12.94 ± 0.38 ^a	4.56 ± 0.25 ^a	2.16 ± 0.06 ^c	0.76 ± 0.04 ^c	0.35 ± 0.02 ^a	44.41 ± 0.13 ^b
N × density		**	***	***	***	***	***	***	ns