Research on the water use efficiency and foliar nutrient status of <Emphasis Type="Italic">Populus euphratica</Emphasis> and <Emphasis Type="Italic">Tamarix ramosissima</Emphasis> in the extreme arid region of China |
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| Authors: | Sheng Kui Cao Qi Feng Yong Hong Su Zong Qiang Chang Hai Yang Xi |
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| Institution: | (1) Division of Hydrology and Water-Land Resources in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) College of Life and Geographic Sciences, Qinghai Normal University, Xining, 810008, China |
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| Abstract: | Seasonal variations in foliar stable carbon composition (δ13C) and nitrogen (N), phosphorus (P) and potassium (K) concentrations of Populus euphratica Olivier and Tamarix ramosissima Ledeb, as well as correlations between foliar δ13C values and N, P and K concentrations were studied in the Ejina oasis in the lower reaches of the Heihe River, northwestern
China. Foliar δ13C values, and P and K concentrations significantly differed between species. Foliar δ13C signatures in T. ramosissima were significantly more enriched than those in P. euphratica, but P and K concentrations of P. euphratica were higher. The seasonal variations and patterns of these were similar. The total foliar δ13C values and N, P and K concentrations in both P. euphratica and T. ramosissima showed a descending trend. There were significantly positive correlations between foliar δ13C values and N and P concentration of both P. euphratica and T. ramosissima. For the relationship between foliar δ13C and K concentration, there appeared oppositely positive and negative correlations in P. euphratica and T. ramosissima, respectively, but they were not significant. The simple positive correlations of δ13C–P% and δ13C–N% suggested that N and P in P. euphratica and T. ramosissima behave in a similar manner. This study also showed that there were nutrient deficiencies; N and P nutriments were the co-limiting
factors in P. euphratica, while it was P nutriment in T. ramosissima. |
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