Effects of nutrient addition on nitrogen,phosphorus and non-structural carbohydrates concentrations in leaves of dominant plant species in a semiarid steppeChinese Full Text
WANG Xue;LUO Wen-tao;YU Qiang;YAN Cai-feng;XU Zhu-wen;LI Mai-he;JIANG Yong;State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences;
Abstract: Nitrogen（N）,phosphorus（P）,soluble carbohydrates（SC）,and starch concentrations in leaves of two dominant grass species,Stipa grandis and Leymus chinensis,were examined based on a seven-year nutrient addition experiment in a semi-arid steppe in Inner Mongolia of China. The experiment included five treatments: control,low P,low N,low N + high P,and high N + low P. Results showed that N,P,SC,starch,and non-structural carbohydrates（NSC） concentrations in leaves of the two plant species were significantly influenced by nutrient addition（P ＜ 0. 05）. A significant interaction effect（P ＜ 0. 05） was observed between nutrient addition and plant species. Leaf N concentration was increased（P ＜ 0. 05） for both plant species under the treatments with N addition; starch content was decreased（P ＜ 0. 05） for both plants in the low N treatment; leaf SC in L. chinensis was decreased under the low P treatment; while NSC content in leaves of both species significantly decreased（P ＜ 0. 05） with high N + low P addition. No significant response was observed for all variables in S. grandis leaf to P addition. The comparatively higher leaf C /N,C /P,and SC /starch in S. grandis implied more available carbohydrates and a higher use efficiency of S. grandis in N and P nutrients,while L. chinensis exhibited a competitively stronger feature of absorbing nutrients applied.
Keywords：
grassland plant; C /N; N /P; non-structural carbohydrates; nutrient addition; nutri-ent physiology;
- DOI：
10.13292/j.1000-4890.20140422.028
- Series：
- Subject：
- Classification Code：
Q945
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