科尔沁沙地优势固沙灌木叶片氮磷化学计量内稳性

宁志英,李玉霖,杨红玲,张子谦

Nitrogen and phosphorus stoichiometric homoeostasis in leaves of dominant sand-fixing shrubs in Horqin Sandy Land, China

Zhi-Ying NING,Yu-Lin LI,Hong-Ling YANG,Zi-Qian ZHANG

表1 科尔沁沙地优势固沙灌木盐蒿和小叶锦鸡儿叶片N、P含量和比值(平均值±标准误差)

Table 1 Nitrogen (N) and phosphorus (P) concentrations and their ratios in leaves of Artemisia halodendron and Caragana microphylla in Horqin Sandy Land (mean ± SE)

物种 Species 指标 Index 算数平均值 Arithmetic average 中位数 Median 众数 Mode 变异系数 Coefficient of variation(%) 极小值 Minimum value 极大值 Maximum value 盐蒿 A. halodendron N (g·kg-1) 23.24 ± 0.49 24.50 27.00 18.71 15.00 31.40 P (g·kg-1) 3.80 ± 0.05 3.82 3.67 11.05 2.86 4.53 N:P 6.10 ± 0.10 6.17 5.59 14.43 4.02 7.82 小叶锦鸡儿 C. microphylla N (g·kg-1) 30.44 ± 0.46 31.00 30.40 13.24 18.20 37.90 P (g·kg-1) 1.96 ± 0.04 1.97 1.97 17.86 1.24 2.69 N:P 15.86 ± 0.29 15.71 11.28 15.82 11.28 24.33