Life form-dependent nitrogen–phosphorous allocation strategies of leaf and fine root in a temperate natural forest under long-term nitrogen addition

Author:

Yu Jiangshan1,Song Zhaopeng2,Hou Jihua1

Affiliation:

1. School of Ecology and Nature Conservation, Beijing Forestry University , Beijing 100083 , China

2. Laboratory for Earth Surface Processes (MOE), College of Urban and Environmental Science, Peking University , Beijing 100871 , China

Abstract

Abstract Nitrogen deposition has increased rapidly in eastern China, which can affect the stoichiometric characteristics of plants. However, the effects of N addition on the nitrogen (N) and phosphorous (P) allocation strategies for various plant life forms (e.g. trees, shrubs and herbs) have rarely been studied. In this study, we evaluated the effects of N addition on N and P stoichiometry and their scaling exponents in the leaves and fine roots of the different life form groups. N and P concentrations in the leaves of shrubs and herbs increased under N addition treatments, whereas tree leaves exhibited a more stable response. In contrast, N addition had no significant effect on N and P concentrations in the fine roots of the three plant life forms. N addition enhanced the allocation of more N and P to the leaves than to the fine roots in all three life forms. Furthermore, the N–P allocation scaling exponents of the leaves and fine roots of the trees were equal to 1.0, indicating an isometric pattern. In contrast, the N–P allocation scaling exponents of shrubs and herbs were less than 1.0, indicating an allometric pattern. Although high N availability promoted shrubs and herbs to distribute P to leaves at a higher proportion than N, only slight effects were detected in tree leaves. These changes in N–P allocation patterns indicate that life forms and N addition levels work together to modulate plants allocation strategies. These results suggest the importance of life form categories when evaluating N–P allocation strategies in forest plants.

Funder

National Natural Science Foundation of China

National Science and Technology Basic Resource Survey Program of China

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics

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