Variations of N and P Contents in Different C4 Plant Species and Their Inter-family Differences
The contents of N and P in 34 plant species of 10 families which have been reported in some references were analysed in order to understand the variations of N and P contents in leaves of different C4 plants. Results showed that the N, P contents exhibited certain regularity though the contents were various in different species. Many plant species had moderate leaf N content ranging from 1.5 percent to 2.0 percent, accounting for 29.41 percent of the total 34 species. The numbers of plant species with N content ranging from 1.0 percent to 1.5 percent and from 2.0 percent to 2.5 percent were close, accounting for 17.65 percent and 20.59 percent respectively. Those species with N content of leaves within 3.5 percent and 4.0 percent or over 4.0 percent occupied 2.94 percent and 2.91 percent respectively. About 23.53 percent of the studied species showed P content ranging from 0.75×10-3 to 1.25×10-3, which made up the largest proportion of the C4 species in this study, while the species with P content less than 0.25×10-3 were the least, accounting for 2.92 percent. The species with N : P ratio of 10～15 made up the largest proportion (29.41 percent). The N content in species of Che-nopodiaceae was highest (0.033 3) , followed by the families of Zygophyllaceae and Leguminosae (0.030～0.031). The minimum leaf N content was only 1.6 percent in species of Gramineae. The average P content of leaves in species of Che-nopodiaceae (2.91×10-3) was higher than that in Rosaceae (2.32×10-3) and Gramineaeand (1.67×10-3), and the lowest P content was found in species of Cyperaceae (0.74×10-3). The N : P ratio in Chenopodiaceae was highest (44.85), followed by Leguminosae (27.45) and Zygophyllaceae (10.84).
C4 plantsN contentP contentDifferences between species
NETL
NSTL
万方数据
维普
