Pedosphere 19(4): 496--504, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of stem density on leaf nutrient dynamics and nutrient use efficiency of dwarf bamboo
WU Fu-Zhong1,2,3, YANG Wan-Qin1,2, WANG Kai-Yun1,4, WU Ning1 and LU Ye-Jiang1
1 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041 (China)
2 Faculty of Forestry, Sichuan Agricultural University, Ya'an 625014 (China)
3 Graduate University of the Chinese Academy of Sciences, Beijing 100049 (China)
4 Shanghai Key Laboratory of Urbanization Processes and Ecological Restoration, East China Normal University, Shanghai 200062 (China)
ABSTRACT
      The monthly dynamics of nitrogen (N) and phosphorus (P) concentrations and stocks in leaves, resorption efficiency, and resorption proficiency as well as leaf-level use efficiency, nutrient productivity, and mean residence time were studied to understand the effect of stem density of dwarf bamboo (Fargesia denudata Yi) on leaf-level N and P use efficiency in three dwarf bamboo stands with different stem densities under bamboo-fir (Picea purpurea Mast.) forest over one growing period in the Wanglang National Nature Reserve, Sichuan, China. Dwarf bamboo density had little effect on the dynamics pattern of both N and P concentrations, stocks, resorption efficiency, and resorption proficiency, but strongly affected their absolute values and leaf-level use efficiency. Higher density stands stored more nutrients but had lower concentrations. There was a clear difference in the resorption of limiting nutrient (N) and non-limiting nutrient (P) among the stands. Phosphorus resorption efficiency, N resorption proficiency, and P resorption proficiency increased with increase of stem density, but no significant variation of N resorption efficiency was found among the stands. Moreover, the higher density stands used both N and P more efficiently with higher N productivity and higher P mean residence time, respectively. Higher P productivity was found in the lower density stands, but there was no clear variation in the N mean residence time among stands. These suggested that the higher density stands may have more efficient strategies for utilizing nutrients, especially those which are limiting.
Key Words:  mean residence time, nutrient productivity, nutrient resorption
Citation: Wu, F. Z., Yang, W. Q., Wang, K. Y., Wu, N. and Lu, Y. J. 2009. Effect of stem density on leaf nutrient dynamics and nutrient use efficiency of dwarf bamboo. Pedosphere. 19(4): 496-504.
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