降水变化对内蒙古典型草原地上生物量的影响

苗百岭,梁存柱,史亚博,梁茂伟,刘钟龄

Temporal changes in precipitation altered aboveground biomass in a typical steppe in Nei Mongol, China

MIAO Bai-Ling,LIANG Cun-Zhu,SHI Ya-Bo,LIANG Mao-Wei,LIU Zhong-Ling

表4 1982-2015年内蒙古锡林郭勒典型草原羊草样地各等级降水变化特征

Table 4 Characteristics of precipitation changes for different levels in study area in the typical steppe grassland of Xilin Gol, Nei Mongol during 1982-2015

编号 ID 日降水量(mm) Daily precipitation 降水频率(%) Precipitation frequency 降水贡献率(%) Contribution to the total rainfall 平均值 Average 变异系数 CV 变化率 Change rate p 平均值 Average 变异系数 CV 变化率 Change rate p Ⅰ 0.1-5 79.15 6.30 0.28** 0.00 28.80 21.43 0.26* 0.02 Ⅱ 5-10 10.62 40.81 -0.15* 0.04 21.71 44.11 -0.07 0.66 Ⅲ 10-15 5.27 49.04 -0.06 0.21 18.12 45.72 0.00 0.99 Ⅳ 15-20 2.43 61.63 -0.04 0.17 12.10 61.22 -0.08 0.53 Ⅴ 20-25 1.16 97.60 -0.01 0.54 7.04 92.22 -0.01 0.91 Ⅵ 25-30 0.52 121.14 -0.01 0.24 3.67 118.56 -0.07 0.40 Ⅶ 30-35 0.35 193.38 -0.02 0.13 2.96 187.87 -0.13 0.18 Ⅷ >35 0.49 171.51 0.01 0.63 5.60 163.85 0.11 0.50