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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (2): 415-422.doi: 10.13287/j.1001-9332.201702.020

• Special Features for 2016 Annual Meeting of Ecological Society of China • Previous Articles     Next Articles

Leaf nitrogen and phosphorus stoichiometry of shrubland plants in the rocky desertification area of Southwestern Hunan, China.

JING Yi-ran1, DENG Xiang-wen1, 2*, WEI Hui1, LI Yan-qiong1, 3, DENG Dong-hua4, LIU Hao-jian4, XIANG Wen-hua1, 2   

  1. 1College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410018, China;
    2National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha 410018, China;
    3Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany/Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China;
    4Shaoyang Bureau of Forestry, Shaoyang 422100, Hunan, China.

  • Received:2016-07-06 Online:2017-02-18 Published:2017-02-18
  • Contact: * E-mail: dxwfree@126.com
  • Supported by:
    This work was supported by the Forestry Science and Technology Promotion Project of State Forestry Administration of China ([2014]52), and the Desertification (Rocky Desertification) Monitoring Project of State Forestry Administration of China (20150618)

Abstract: In this paper, we took the leaves of shrubland plants in rocky desertification area in Southwestern Hunan as the research object to analyze the nitrogen (N) and phosphorus (P) stoichiometry characteristics for different functional groups and different grades of rocky desertification, i.e., light rocky desertification (LRD), moderate rocky desertification (MRD) and intense rocky desertification (IRD). The results showed that the average contents of N and P were 12.89 and 1.19 g·kg-1, respectively, and N/P was 11.24 in common shrubland plants in the study area, which indicated that the growth of most plants were mainly limited by N. The content of N was declined in order of deciduous shrubs > evergreen shrubs > annual herbs > perennial herbs. The content of P and N/P were higher in deciduous shrubs than in perennial herbs. Significant differences were found among the main families of plants in terms of the contents of N, P and N/P in the study sites. The plants of Gramineae had the lowest contents of N and P, andtheir growth was mostly restricted by N, while Leguminosae had the highest content of N and N/P, and their productivity was majorly controlled by P. The contents of N and P in the leaves were significantly higher in dicotyledon plants and C3 plants than in monocotyledon plants and C4 plants, but the N/P was not significantly diffe-rent between these two plant categories. The nitrogen-fixing plants had higher content of N and N/P than the non-nitrogen-fixing plants, but the P content was not significantly different between these two plant groups. There were significant correlations between contents of N and P, N/P and N in all study plots. No significant correlation was found between N/P and P content in the examined rocky desertification sites, except for that in MRD. There were no significant differences of the contents of N, P and N/P under different grades of rocky desertification.