关键词: 中国东部南北样带, 森林, Redfield比例, 叶片养分, 生态化学计量学

Abstract: One hundred and twelve sampling sites in the forest ecosystems along the North-South Transect of Eastern China (NSTEC) were selected to study the stoichiometric characteristics and variability of leaf carbon (C), nitrogen (N), and phosphorous (P) of 102 dominant species. The contents of leaf C (Cmass), leaf N (Nmass), and leaf P (Pmass) ranged in 374.1-646.5 mg·g-1, 8.4-30.5 mg·g-1, and 0.6-6.2 mg·g-1, with the arithmetic mean (AM) being 480.1, 183 and 2.0 mg·g-1, and the variation coefficient (CV) being 11.1%, 27.5%, and 56.4%, respectively. The leaf C/N, C/P and N/P ranged from 14.1 to 64.1, from 70.9 to 838.6, and from 1.5 to 21.2, with the AM being 29.1, 313.9 and 11.5, and the CV being 32.8%, 48.3% and 44.1%, respectively. The mass ratio of C:N:P was 313.9:11.5:1, and the atom ratio was 8109:254:1. As compared with those at global scale, the tree leaf Cmass and C/N in the study area were significantly higher, Nmass and N/P were significantly lower, while Pmass and C/P had less differences.

Key words: North-South Transect of Eastern China (NSTEC), forest, Redfield ratio, leaf nutrient, ecological stoichiometry