放牧对中国亚热带喀斯特山地灌草丛物种组成与群落结构的影响

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黄侩侩¹^,², 胡刚¹, 庞庆玲¹^,², 张贝¹^,², 何业涌¹^,², 胡聪¹, 徐超昊¹, 张忠华¹^,^*(

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Effects of grazing on species composition and community structure of shrub tussock in subtropical karst mountains, southwest China

HUANG Kuai-Kuai¹^,², HU Gang¹, PANG Qing-Ling¹^,², ZHANG Bei¹^,², HE Ye-Yong¹^,², HU Cong¹, XU Chao-Hao¹, ZHANG Zhong-Hua¹^,^*(

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图2. 中国亚热带喀斯特山地灌草丛样方与环境因子的非度量多维尺度排序(NMDS)。A, 灌木层。B, 草本层。C, 群落整体。CK, 无放牧; HG, 重度放牧; LG, 轻度放牧; MG, 中度放牧。AK, 速效钾含量; Alt, 海拔; AN, 碱解氮含量; AP, 速效磷含量; Asp, 坡向; Bd, 土壤密度; G, 放牧强度; RER, 岩石裸露率; Slop, 坡度; SOM, 土壤有机质含量; Stress, 协强系数; SWC, 土壤含水量; TCa, 全钙含量; TK, 全钾含量; TMg, 全镁含量; TN, 全氮含量; TP, 全磷含量; Tp, 土壤总孔隙度。图中椭圆为60%置信区间。

Fig. 2. Non-metric multi-dimensional scaling (NMDS) ordination of shrub tussock plots and environmental factors in subtropical karst mountains of China. A, Shrub layer. B, Herb layer. C, Total community. CK, none grazing; HG, heavy grazing; LG, light grazing; MG, moderate grazing. AK, available potassium content; Alt, altitude; AN, alkali-hydrolyzable nitrogen content; AP, available phosphorus content; Asp, slope aspect; Bd, soil density; G, grazing intensity; RER, rock exposure rate; Slop, slope; SOM, soil organic matter content; SWC, soil water content; TCa, total calcium content; TK, total potassium content; TMg, total magnesium content; TN, total nitrogen content; TP, total phosphorus content; Tp, total soil porosity. The ellipse in the figure is the 60% confidence interval.