图2. 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不同放牧强度的响应比(平均值± 95% CI)。右侧数字表示各变量的样本量。CI, 置信区间。HG, 重度放牧; LG, 轻度放牧; MG, 中度放牧。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. 2. Response ratio of plant biomass, cover, height, density, species diversity, and soil physical and chemical properties to different grazing intensities in Nei Mongol grassland (mean ± 95% CI). The number on the right indicates the sample size of each variable. CI, confidence interval. HG, heavy grazing; LG, light grazing; MG, mediate grazing. 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, soli total phosphorus content; SWC, soil water content.