放牧和模拟增温对藏北高寒草地植物群落特征及生产力的影响

吴红宝,高清竹,干珠扎布,李钰,闫玉龙,胡国铮,王学霞,严俊,何世丞

Effects of grazing and simulated warming on plant community structure and productivity of alpine grassland in Northern Xizang, China

WU Hong-Bao,GAO Qing-Zhu,Ganjurjav Hasbagan,LI Yu,YAN Yu-Long,HU Guo-Zheng,WANG Xue-Xia,YAN Jun,HE Shi-Cheng

表2 对照、增温、放牧及增温+放牧处理下藏北高寒草地群落物种组成及其重要值(2017年)

Table 2 Species composition and their important values of alpine grassland communities under treatments of control, warming, grazing and the combination of warming and grazing in Northern Xizang in 2017

植物类群 Plant group 物种 Species CK W G WG 莎草类 Sedges 高山嵩草 Kobresia pygmaea 0.420 0.354 0.475 0.448 青藏薹草 Carex moorcroftii 0.109 0.118 - - 矮生嵩草 Kobresia humilis 0.028 - - - 禾草类 Grasses 紫花针茅 Stipa purpurea - - 0.113 0.179 草地早熟禾 Poa pratensis 0.197 0.238 - - 杂类草 Forbs 垫状点地梅 Androsace tapete 0.003 0.002 - - 星状雪兔子 Saussurea stella - - 0.064 0.033 矮火绒草 Leontopodium nanum - - 0.040 - 蓝花棘豆 Oxytropis caerulea 0.032 0.041 0.058 - 藏豆 Stracheya tibetica - 0.019 - 0.064 蒲公英 Taraxacum mongolicum - - 0.014 0.025 肉果草 Lancea tibetica 0.052 0.034 - 0.007 短穗兔耳草 Lagotis brachystachya 0.008 0.030 0.034 0.024 二裂委陵菜 Potentilla bifurca 0.043 0.069 0.068 0.071 钉柱委陵菜 Potentilla saundersiana 0.047 0.061 0.073 0.075 多裂委陵菜 Potentilla multifida 0.047 0.034 0.061 0.074 山莓草 Sibbaldia procumbens 0.014 - - -