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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (6): 1-9.doi: 10.11707/j.1001-7488.20140601

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Distribution Patterns and Stoichiometry Characteristics of C, N, P in Phyllostachys edulis Forests of Different Productivity Levels

Guo Baohua1, Liu Guanglu1, Fan Shaohui1, Du Manyi2, Su Wenhui1   

  1. 1. International Centre for Bamboo and Rattan Key Laboratory of Science and Technology of Bamboo and Rattan of State Forestry Administration Beijing 100102;
    2. North China Foresty Experiment Center, CAF Beijing 102300
  • Received:2014-04-21 Revised:2014-05-04 Online:2014-06-25 Published:2014-07-07
  • Contact: 范少辉

Abstract:

Phyllostachys edulis forests and soil in their central distribution area in subtropical China were selected as research object. This study discussed the effects of productivity level (Ⅰ: 30 000±1 000 kg·hm-2a-1; Ⅱ: 34 000±1 000 kg·hm-2a-1; Ⅲ: 37 000±1 000 kg·hm-2a-1; Ⅳ: 42 000±1 000 kg·hm-2a-1; Ⅴ: 47 000±1 000 kg·hm-2a-1) on the distribution of carbon (C), nitrogen (N) and phosphorus (P) and their stoichiometric characteristics of Phyllostachys edulis and soil by comparing C, N and P content of Phyllostachys edulis and soil, and their stoichiometric characteristics, which could provide theory evidence for long-term productivity maintenance in Phyllostachys edulis forests. The result showed that the productivity level had less effect on the distribution of plant C and P in different organs, and had more effects on N distribution. The difference of the distribution pattern of C and P of each organ in different productivity levels was not significant, except leaf C (P<0.01). Except bamboo stem, N distribution pattern in different organs in different productivity levels reached a highly significant level (P<0.01). The productivity levels had less impact on the stoichiometry of plant C:N, C:P and N:P, the difference in different productivity levels did not reach a significant level. Stoichiometry of main nutrients in Phyllostachys edulis forests was inherently stable, in line with "internal stability hypothesis". The productivity levels had significant impact on soil C, N, P, hydrolyzable N and available P, soil C:N, C:P, N:P, H-N:A-P reached a highly significant level in different productivity levels (P<0.01). When N:P < 14, the forests was mainly limited by N. In this study, soil N:P was 4.50-13.89, indicating Phyllostachys edulis forests in research area was mainly limited by N, rather than P. N:P decreased with the increase of productivity level, soil N:P was index to represent Phyllostachys edulis forests degradation succession process. Analysis the correlation between stoichiometry value of main nutrient of plant and soil indicated no significant level between the two.

Key words: Phyllostachys edulis forest, C, N, P, distribution pattern, stoichiometric parameter

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