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1 年份、增温、放牧及其交互作用对藏北高寒草地植物高度、盖度、物种重要值、净初级生产力及物种多样性影响的多因素方差分析结果(p值)

Table 1 Results (p value) of the three way ANOVA of year, warming, grazing and their interaction effects on height, coverage, species important value, net primary productivity and species diversity index of alpine grassland in Northern Xizang

因子 Factor 高度 Height 盖度 Coverage 物种重要值 Species important value 净初级生产力 Net primary productivity 物种多样性指数 Species diversity index 莎草类 Sedges 禾草类 Grasses 杂类草 Forbs 莎草类 Sedges 禾草类 Grasses 杂类草 Forbs Species richness index Shannon- Weiner index Pielou index Y 0.061 0.032 0.480 0.481 0.052 0.412 0.446 0.074 0.209 0.907 0.078 W <0.001 <0.001 0.001 <0.001 0.055 0.773 0.174 0.618 1.000 0.543 0.331 G <0.001 <0.001 <0.001 0.004 0.008 0.445 0.003 0.503 0.396 0.872 0.236 Y × W 0.065 0.055 0.396 0.444 0.716 0.191 0.199 0.158 0.668 0.523 0.511 Y × G 0.380 0.283 0.143 0.092 0.482 0.177 0.290 0.122 0.001 0.019 0.470 W × G 0.003 0.001 0.001 0.376 0.882 0.103 0.066 0.048 1.000 0.617 0.347 Y × W × G 0.903 0.103 0.587 0.926 0.169 0.201 0.708 0.145 0.209 0.332 0.904