不同形态和水平的氮添加对内蒙古草甸草原土壤净氮矿化潜力的影响

李阳,徐小惠,孙伟,申颜,任婷婷,黄建辉,王常慧

Effects of different forms and levels of N additions on soil potential net N mineralization rate in meadow steppe, Nei Mongol, China

LI Yang,XU Xiao-Hui,SUN Wei,SHEN Yan,REN Ting-Ting,HUANG Jian-Hui,WANG Chang-Hui

表4 氮添加形态和数量对内蒙古草甸草原土壤微生物呼吸熵的影响(平均值±标准偏差, n = 3)

Table 4 Effects of nitrogen (N) addition forms and levels on soil microbial metabolic quotient in the meadow steppe in Nei Mongol (mean ± SD, n = 3)

氮添加水平 N addition level (g·m^-2)	AU	AS	AN	AC	AR
0	1.58 ± 0.40^b	2.70 ± 0.33^ab	7.43 ± 4.31^a	1.72 ± 0.37^b	3.80 ± 3.48^ab
2	1.21 ± 2.11^b	1.79 ± 0.08^c	3.72 ± 1.06^ab	1.28 ± 0.43^c	4.87 ± 0.87^a
5	1.69 ± 0.30^a	2.93 ± 2.60^a	2.14 ± 1.01^a	2.65 ± 2.26^a	3.29 ± 1.24^a
10	1.26 ± 0.74^ab	0.58 ± 0.15^b	0.62 ± 0.47^b	1.71 ± 0.42^ab	3.53 ± 2.87^a
20	2.98 ± 0.51^a	0.26 ± 0.04^c	0.09 ± 0.03^c	0.94 ± 0.87^b	0.18 ± 0.15^c
50	0.16 ± 0.14^b	0.06 ± 0.04^b	0.13 ± 0.01^b	1.31 ± 0.57^ab	4.28 ± 3.91^a