Chin J Plan Ecolo ›› 2010, Vol. 34 ›› Issue (1): 23-28.doi: 10.3773/j.issn.1005-264x.2010.01.005
• Special feature: Ecological Stoichiometry •
WU Tong-Gui*;WU Ming**;LIU Li; XIAO Jiang-Hua
Aims Homeostasis constrains the elemental composition of individual species within narrow bounds no matter the chemical composition of the environment or the resource base. Our objective was to determine the dynamics of leaf stoichiometry during the growth period of plants and the optimum time for stoichiometry study.
Methods We monitored leaf N, P stoichiometry of Scirpus mariqueter, Carex scabrifolia and Phragmites australis, the dominant species in Hangzhou Bay coastal wetlands, at different growth stages from May to October 2007.
Important findings Leaf N, P stoichiometry of the Scirpus, Carex and Phragmites species showed differences: 7.41–17.12, 7.47–13.15 and 6.03–18.09 mg·g–1 for N, 0.34–2.60, 0.41–1.10 and 0.35–2.04 mg·g–1 for P, and 7.19–30.63, 11.58–16.81 and 8.62–21.86 for N:P ratios, respectively. The arithmetic means for the three species were (11.69 ± 2.66), (10.17 ± 1.53) and (11.56 ± 3.19) mg·g–1 for N, (0.93 ± 0.62), (0.74 ± 0.23) and (0.82 ± 0.53) mg·g–1 for P, and 16.83 ± 8.31, 14.53 ± 3.91 and 16.49 ± 5.51 for N:P, respectively, but there was no sig-nificant difference of N, P stoichiometry (p > 0.05). It showed high N, P concentrations at the early stage of growth because of small biomass and then decreased greatly with leaf expansion during the fast growth period, increased as leaf growth became stable and decreased again with leaf senescence. Leaf N:P was low at the early stage of growth and then increased, decreased strongly at the fast growth period, and became stable after leaf maturation.
WU Tong-Gui, WU Ming, LIU Li, XIAO Jiang-Hua. Seasonal variations of leaf nitrogen and phosphorus stoichiometry of three herbaceous species in Hangzhou Bay coastal wetlands, China[J].Chin J Plan Ecolo, 2010, 34(1): 23-28.
Add to citation manager EndNote|Reference Manager|ProCite|BibTeX|RefWorks
Copyright © 2018 Chinese Journal of Plant Ecology
Tel: 010-62836134, 62836138, E-mail: email@example.com, firstname.lastname@example.org