降水量变化对藏北高寒草地养分限制的影响

宗宁, 石培礼, 赵广帅, 郑莉莉, 牛犇, 周天财, 侯阁

Variations of nitrogen and phosphorus limitation along the environmental gradient in alpine grasslands on the Northern Xizang Plateau

ZONG Ning, SHI Pei-Li, ZHAO Guang-Shuai, ZHENG Li-Li, NIU Ben, ZHOU Tian-Cai, HOU Ge

表1 藏北高寒草地试验样地概况

Table 1 Description of study sites in alpine grasslands on the Northern Xizang Plateau

研究站点 Study site 高寒草甸 Alpine meadow 高寒草甸草原 Alpine meadow-steppe 高寒草原 Alpine steppe 高寒荒漠草原 Alpine desert-steppe 经纬度 Latitude and longitude 31.57° N, 92.57° E 31.38° N, 90.23° E 31.78° N, 87.23° E 32.37° N, 82.27° E 海拔 Altitude (m) 4 570 4 590 4 580 4 520 年平均气温 Mean annual air temperature (℃) -0.9 -1.0 -1.4 -1.4 年降水量 Mean annual precipitation (mm) 444.9 335.4 327.4 175.2 群落盖度 Coverage (%) 70-80 40-50 20-30 15-25 优势种群 Dominant species 高山嵩草 Kobresia pygmaea 紫花针茅、窄叶薹草 Stipa purpurea, Carex montis-everesti 紫花针茅 S. purpurea 紫花针茅、小叶棘豆 S. purpurea, Oxytropis microphylla