图4. 不同放牧年限下, 内蒙古草地植物生物量、盖度、高度、密度、物种多样性和土壤理化性质对放牧的响应比(平均值± 95% CI)。右侧数字表示各变量的样本量。CI, 置信区间。AGB, 地上生物量; BGB, 地下生物量; D, Pielou均匀度指数; E, Simpson多样性指数; H′, Shannon-Wiener多样性指数; SD, 土壤密度; SpH, 土壤pH; SOC, 土壤有机碳含量; SR, 物种丰富度; STN, 土壤全氮含量; STP, 土壤全磷含量; SWC, 土壤含水量。

Fig. 4. Under different grazing years, the response ratio of plant biomass, cover, height, density, species diversity, and soil physical and chemical properties to grazing in Nei Mongol grassland (mean ± 95% CI). The number on the right indicates the sample size of each variable. CI, confidence interval. AGB, above-ground biomass; BGB, below-ground biomass; D, Pielou evenness index; E, Simpson diversity index; H′, Shannon-Wiener diversity index; SD, soil density; SpH, soil pH; SOC, soil organic carbon content; STN, soil total nitrogen content; STP, soil total phosphorus content; SWC, soil water content.