不同水平氮添加对盐渍化草地土壤微生物特征的影响

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杨建强¹, 刁华杰²^,³^,⁴, 胡姝娅⁴, 王常慧²^,³^,⁴^,^*(

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Effects of nitrogen addition at different levels on soil microorganisms in saline-alkaline grassland of northern China

YANG Jian-Qiang¹, DIAO Hua-Jie²^,³^,⁴, HU Shu-Ya⁴, WANG Chang-Hui²^,³^,⁴^,^*(

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图3. 盐渍化草地土壤微生物生物量碳(MBC)、氮(MBN)含量的季节动态及年际均值(平均值±标准误)。*、**、***分别表示各处理间在p < 0.05, p < 0.01及p < 0.000 1水平上差异显著; 柱形图中不同小写字母表示处理间差异显著(p < 0.05)。CK, 对照; N₁, 氮添加1 g·m^-2·a^-1; N₂, 氮添加2 g·m^-2·a^-1; N₄, 氮添加4 g·m^-2·a^-1; N₈, 氮添加8 g·m^-2·a^-1; N₁₆, 氮添加16 g·m^-2·a^-1; N₂₄, 氮添加24 g·m^-2·a^-1; N₃₂, 氮添加32 g·m^-2·a^-1。

Fig. 3. Seasonal and inter-annual mean values (mean ± SE) of soil microbial biomass carbon (MBC) and nitrogen (MBN) content in saline-alkaline grassland. *, ** and *** represent the differences among treatments are significant with p < 0.05, p < 0.01 and p < 0.000 1, respectively; different lowercase letters in the bar chart indicate significant differences among treatments (p < 0.05). CK, control; N₁, nitrogen addition level 1 g·m^-2·a^-1; N₂, nitrogen addition level 2 g·m^-2·a^-1; N₄, nitrogen addition level 4 g·m^-2·a^-1; N₈, nitrogen addition level 8 g·m^-2·a^-1; N₁₆, nitrogen addition level 16 g·m^-2·a^-1; N₂₄, nitrogen addition level 24 g·m^-2·a^-1; N₃₂, nitrogen addition level 32 g·m^-2·a^-1.