Abstract: Leaves and fine roots are the important nutrition organs of aboveground and underground part of plants, respectively. Studies on the correlation of their stoichiometric characteristics are one of the most important aspects to explore adaptive strategy of plants. Nitrogen (N) and phosphorus (P) concentrations and N:P stoichiometry of leaves and different order roots from 34 common plant species were studied in Liangshui National Nature Reserve Heilongjiang Province. The results showed that there were differences in N and P concentrations between different organs, and certain correlations existed between N and P concentrations in different organs. N and P concentrations and N:P were in the order of leaves > 1-2 order roots > 3-5 order roots. The order of the correlation of N and P concentration was 1-2 order roots > leaves > 3-5 order roots. N concentration, P concentration and N:P ratio of leaves showed significantly positive correlations with those of 1-2 order roots, while only N concentration of leaves had a correlation with that of 3-5 order roots. In different life forms, N and P concentrations and N:P ratio in leaves of trees, shrubs and herbs showed significant positive correlations with
those of different order roots. The findings of this study demonstrated the relationship between the plant’s leaves and different order roots, providing insights into interactions among plant functional traits and plant strategy for resource acquisition and allocation during plant growth.

Key words: yield, microbial agent, substrate enzyme activity, quality., tomato