Variations in leaf and root stoichiometry of Nitraria tangutorum along aridity gradients in the Hexi Corridor,northwest China |
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Authors: | N Wang J Gao S Q Zhang G X Wang |
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Institution: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Shaanxi, Yangling, 712100, China 2. State Key Laboratory of Plant Physiology and Biochemistry Institute of Ecology, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
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Abstract: | Nitrogen (N) and phosphorus (P) concentrations and N: P ratios between leaves and roots of Nitraria tangutorum along aridity gradients were studied. N. tangutorum was relatively limited by N in April (mean leaf N: P ratio = 11.13) and by P in August (mean leaf N: P ratio = 38.78). N and P in both leaves and roots were highly correlated across sampling sites. In April both leaf and root N and P concentrations increased along aridity gradients. Mean leaf N: P ratios changed slightly, but mean root N: P ratios increased with increasing aridity gradients. We suggest that leaf N: P ratios can indicate nutrient status at different plant growth stages, and root N: P ratios can signify if the amount of soil nutrients is insufficient. |
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