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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