Stoichiometry Characteristics of Leaf Nitrogen and Phosphorus of Different Plant Functional Groups in Alashan Desert Region

Zhang Ke; Chen Yongle; Gao Yanhong; Hui Rong; He Mingzhu

doi:10.7522/j.issn.1000-694X.2013.00431

2014 , Vol. 34 >Issue 5: 1261 - 1267

DOI: https://doi.org/10.7522/j.issn.1000-694X.2013.00431

Stoichiometry Characteristics of Leaf Nitrogen and Phosphorus of Different Plant Functional Groups in Alashan Desert Region

Zhang Ke ,
Chen Yongle ,
Gao Yanhong ,
Hui Rong ,
He Mingzhu

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1. Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Laboratory of Plant Stress Ecophysiology and Biotechnology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received date: 2013-06-09

Revised date: 2013-08-14

Online published: 2014-09-20

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Abstract

Nitrogen and phosphorus are crucial limiting factors of nutrient elements in desert ecosystem, which play vital roles in maintaining the rational composition of plant functional groups and driving the nutrient cycling of the desert ecosystem. By sampling the dominant plant leaves among the 52 sample sites that be set along the precipitation and temperature gradients from the eastern to western in Alashan desert, ecological stoichiometric characteristics of nitrogen and phosphorus among different plant functional groups were analyzed and the restrictive effects of N and P on the desert plants were tested and discussed. The results showed that (1) Leaf N and P concentrations were (10.65±7.91) mg·g^-1and (1.04±0.81) mg·g^-1, respectively, while N:P was (11.53±5.06). Leaf nitrogen has significantly positive correlation with N and N:P ratio and leaf P has significantly negative correlation with N:P ratio. By comparison and analysis, desert plants were co-limited by N and P, and were more limited by N. (2) Generally, from the comparison of plant life types, leaf N and P content in herbaceous plants were higher than those in shrubs and N:P in shrubs was greater than in herbs. From the analysis of photosynthetic pathway, C₃ plants had higher average N concentration than C₄ plants, while C₄ plants had higher average P concentration than C₃ plants. From the type of phylogenetic, leaf N content was lower in monocotyledons than in dicotyledons while P content was higher in monocotyledons than in dicotyledons.

Key words： desert ecosystem; plant functional; leaf nitrogen and phosphorus contents; ecological stoichiometry

Cite this article

Zhang Ke , Chen Yongle , Gao Yanhong , Hui Rong , He Mingzhu . Stoichiometry Characteristics of Leaf Nitrogen and Phosphorus of Different Plant Functional Groups in Alashan Desert Region[J]. Journal of Desert Research, 2014 , 34(5) : 1261 -1267 . DOI: 10.7522/j.issn.1000-694X.2013.00431

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