菊科种子中元素含量与种子大小、海拔的关系

In this paper, we discussed the effect of seed size and altitude on the C、N、 P content of seeds of 53 Compositae plants on the northeastern Qinghai-Tibet Plateau. The results showed that there was significant difference in seed size of 53 Compositae plants, and a trend that seed size decreased with increasing altitude; the C content of seeds didn't change with seed size variation, but the N and P content of seeds had significant correlation with seed size; there was no significant difference in the C、N、P content of seeds and their ratio among altitudes, however there was a trend that the C、N content of seeds increased and the P content of seeds decreased with increasing altitude.