施肥和放牧对青藏高原高寒草甸物种丰富度的影响

杨中领, 苏芳龙, 苗原, 钟明星, 肖蕊

Effects of fertilization and grazing on species richness in an alpine meadow of Qinghai-Xizang Plateau

YANG Zhong-Ling, SU Fang-Long, MIAO Yuan, ZHONG Ming-Xing, XIAO Rui

表2 施肥对封育地和放牧地组成物种单位植物氮含量(2008和2009年的平均值)的影响

Table 2 Effects of fertilization on plant nitrogen content (the mean of 2008 and 2009) of component species both in enclosure and grazed plots

物种 Species 平均植物氮含量 Mean plant nitrogen content (mg·g-1) 封育 Enclosure 封育施肥 Enclosure + fertilization 放牧 Grazing 放牧施肥 Grazing + fertilization 青藏大戟 Euphorbia altotibetica 14.7 15.9 11.7 14.5 钝裂银莲花 Anemone obtusiloba 14.5 15.8 16.5 16.2 垂穗披碱草 Elymus nutans 7.6 7.5 11.5 10.0 莓叶委陵菜Potentilla fragarioids 13.3 13.8 13.0 15.3 阿尔泰蒲公英Taraxacum altaicum 15.5 17.3 18.1 17.0 米口袋Gueldenstaedtia verna 21.6 24.9 24.8 25.7 蓬子菜Galium verum 14.2 14.8 15.2 20.0 四川嵩草Kobresia setchwanensis 10.3 11.9 9.6 10.7 马尔康柴胡 Bupleurum smithii 13.0 14.8 18.5 16.2 冷地早熟禾Poa crymophila 7.7 7.1 6.5 8.2 钝苞雪莲 Saussurea nigrescens 10.4 9.8 11.2 12.2 高山韭Allium sikkimense 14.5 16.4 14.1 13.7 菭草Koeleria cristata 9.2 10.6 10.3 11.6 细叶亚菊Ajania tenuifolia 13.3 10.2 14.5 16.7 草玉梅Anemone rivularis 14.3 17.3 16.9 15.4 花苜蓿Medicago ruthenica 22.9 25.0 25.9 27.0 椭圆叶花锚Halenia elliptica 13.1 13.3 14.7 14.7 展毛翠雀花 Delphinium kamaonense 10.7 11.6 13.4 13.7 丝叶毛茛 Ranunculus tanguticusvar.capillaceus 13.5 15.5 11.3 13.7 乳白香青Anaphalis lactea 9.9 10.1 10.5 10.9 甘肃棘豆Oxytropis kansuensis 27.1 28.3 28.8 29.7 大籽蒿Artemisia sieversiana 12.1 12.4 12.8 18.7 甘肃马先蒿 Pedicularis kansuensis 19.5 21.8 23.3 27.3 高原毛茛Ranunculus tanguticus 12.8 13.5 11.9 12.9 芒剪股颖 Agrostis trinii 9.5 10.4 12.4 13.7 扁蕾Gentianopsis barbata 10.5 14.4 15.2 16.3