青藏高原高寒草甸成熟和凋落叶片C、N、P生态化学计量学特征

In order to know stoichiometry of plant leaves in alpine meadow, we chose 45 common species to study the stoichiometric charactertics of carbon (C), nitrogen (N), phosphorous ( P) for mature leaves and leaf litter; The contents of C, N, and P for mature leaves ranged in 34.60～49.88﹪,1.25～3.95﹪, and 0.17～0.69﹪, with mean being 42.73﹪, 2.37﹪, and 0.31﹪, respectively. The contents of C, N, and P for leaf litter ranged in 33.05～56.66﹪, 0.37～2.84﹪, and 0.07～0.37﹪, with mean being 42.28﹪, 1.19﹪, and 0.21﹪, respectively. C/N, C/P and N/P of mature leaves ranged from10.16 to 32.16, from 55.87 to 270.18, and from 3.56 to 15.73, with mean being 19.91, 152.76 and 7.93, respectively. C/N、C/P and N/P of leaf litter ranged from 16.55 to 127.92, from 113.72 to 696.46, and from 2.06 to 20.04，with mean being 43.08, 228.68and 6.04, respectively. N/P of mature leaves was less than 14, indicating plant growth were limited by N; As compared with other results, the stoichiometric charactertics of C, C/N, C/P and N/P for mature leaves were lower, while both N and P were higher. There was no differences in C content between mature leaves and leaf litter, while N, P and N/P were significantly lower in leaf litter than in mature leaves (p < 0.05); in contrast, both C/N and C/P were higher in leaf litter than in mature leaves. C concentration did not correlate between mature leaves and leaf litter (r2=0.011, P>0.5), but N concentration and P concentration in mature leaf and leaf litter correlated well, respectively (r2=0.439, P=0.000; r2=0.230, P<0.001); Similarly, C/N, C/P and N/P in mature leaves and leaf litter correlated well, respectively (r2=0.382, P <0.001; r2=0.289, P<0.001 r2=0.366, P <0.001).