氮添加对内蒙古退化草地植物群落多样性和生物量的影响

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杨倩^1,²,王娓^2*(

),曾辉^1,^2*(

)

Effects of nitrogen addition on the plant diversity and biomass of degraded grasslands of Nei Mongol, China

Qian YANG^1,²,Wei WANG^2*(

),Hui ZENG^1,^2*(

)

图2. 氮添加对不同退化草地恢复进程中物种丰富度(A)、物种多样性(B)的影响(平均值±标准误差)。单因素方差分析, Duncan’s多重比较进行处理间差异分析, 不同字母表示差异显著(p < 0.05)。每个样地, 以氮添加量为连续变量, 对物种丰富度进行回归参数估计(物种丰富度=截距+斜率×氮添加量)。NS, p > 0.05; *, p < 0.05; **, p < 0.01; ***, p < 0.001。EDG, 极度退化草地; MDG, 中度退化草地; SDG, 重度退化草地。

Fig. 2. Effects of nitrogen addition on plant species richness (A) and species diversity (B) at different degraded grasslands (mean ± SE). The letters indicted significant differences in Duncan’s multiple (p < 0.05) range tests based on one-way ANOVA; NS indicates non-significant (p > 0.05). For each site, regression confidents were estimated based on linear models with nitrogen treatment as the independent variables (species richness = Intercept + slope × nitrogen addition amount). NS, p > 0.05; *, p < 0.05; **, p < 0.01; ***, p < 0.001. EDG, extremely degraded grassland; MDG, moderately degraded grassland; SDG, severely degraded grassland.