图1. 增温下2017和2018年青藏高原高寒植物各物种返青(A、B)、现蕾(C、D)、开花(E、F)、结实(G、H)时间的变化(平均值±标准误)。图中正、负值分别表示与对照相比推迟、提前的天数; *表示增温处理与对照相比差异显著(p < 0.05)。Cp, 红棕薹草; En, 垂穗披碱草; Gf, 线叶龙胆; Gs, 麻花艽; Ht, 藏异燕麦; Kc, 线叶嵩草; Kh, 矮生嵩草; Mr, 花苜蓿; Ok, 甘肃棘豆; Pp, 草地早熟禾; Pf, 金露梅; Pv, 珠芽蓼; Sa, 异针茅; Sp, 美丽风毛菊; Th, 高山豆。

Fig. 1. Changes of leaf out time (A, B), flower bud time (C, D), flower time (E, F) and fruit time (G, H) among each species of alpine plants on the Qingzang Plateau in 2017 and 2018 under warming condition (mean ± SE). A positive value indicates later than the control; a negative value indicates earlier than the control. * indicates significant difference between treatment and the control (p < 0.05). Cp, Carex przewalskii; En, Elymus nutans; Gf, Gentiana lawrencei var. farreri; Gs, Gentiana straminea; Ht, Helictotrichon tibeticum; Kc, Kobresia capillifolia; Kh, Kobresia humilis; Mr, Medicago ruthenica; Ok, Oxytropis kansuensis; Pp, Poa pratensis; Pf, Potentilla fruticosa; Pv, Polygonum viviparum; Sa, Stipa aliena; Sp, Saussurea pulchra; Th, Tibetia himalaica.