长期放牧和氮添加对黄土高原典型草原长芒草种群生长的影响

黄玲, 王榛, 马泽, 杨发林, 李岚, SEREKPAYEV Nurlan, NOGAYEV Adilbek, 侯扶江

Effects of long-term grazing and nitrogen addition on the growth of Stipa bungeana population in typical steppe of Loess Plateau

HUANG Ling, WANG Zhen, MA Ze, YANG Fa-Lin, LI Lan, SEREKPAYEV Nurlan, NOGAYEV Adilbek, HOU Fu-Jiang

图4 放牧和氮添加对长芒草繁殖性状的影响(平均值±标准误)。A, 生殖枝密度。B, 分蘖密度。C, 生殖枝密度/分蘖密度。不同大写字母表示不同放牧率间差异显著(p < 0.05), 不同小写字母表示不同氮添加量之间差异显著(p < 0.05)。N, 氮添加量; SR, 放牧。**, p < 0.01; ns, p > 0.05。

Fig. 4 Effects of stocking rate and nitrogen addition on reproductive traits of Stipa bungeana (mean ± SE). A, Reproductive branch density. B, Tiller density. C, Productive branch density/tiller density. Different uppercase letters indicate significant differences among different stocking rates (p < 0.05), different lowercase letters indicate significant differences amang different nitrogen addition rates (p < 0.05). N, nitrogen addition rate; SR, stocking rate. **, p < 0.01; ns, p > 0.05.