Soil salt and nutrient concentration in the rhizosphere of desert halophytes |
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Authors: | Yi Liangpeng Ma Jian and Li Yan |
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Institution: | 1. Former Graduate Assistant, Department of Agriculture, Angelo State University, San Angelo, TX 76909, USA;2. Professor, Department of Agriculture, Angelo State University, San Angelo, TX 76909, USA;3. Research Associate, Department of Agriculture, Angelo State University, San Angelo, TX 76909, USA;1. Géosciences Environnement Toulouse (GET), UMR 5563 CNRS, University Paul Sabatier, 14 Edouard Belin, 31400 Toulouse, France;2. Geological Faculty, Moscow State University, 1 Vorobievy Gory, 119234 Moscow, Russia;3. Institute of Ecological Problems of the North, 23 Naberezhnaya Severnoi Dviny, URoRAS, Arkhangelsk, Russia;4. BIO-GEO-CLIM Laboratory, Tomsk State University, Tomsk, Russia |
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Abstract: | North-West China is an arid region where halophyte plants are rich. Very little is known on the rhizospheric soil of the halophytes in this arid desert region. We conducted a rhizobag experiment on the desert Solonchak soil to investigate the salt and nutrient content in the rhizospheric soil of the desert halophytes. The total salt and the concentrations of 8 major kinds of salt ions increased in the rhizosphere of both succulent halophytes and salt secreting halophytes, but this increase was insignificant for salt-resisting halophytes. Accumulation of Cl– and Na+ is the most significant among the 8 major kinds of salt ions. Accumulation of Cl– was more significant than that of SO42– in succulent halophytes and salt secreting halophytes. The Na+/K+, Na+/Ca2+ and Na+/Mg2+ ratios in the rhizosphere of all 7 kinds of halophytes were higher than those in the bulk soil. Total N increased significantly in the rhizosphere, but total P and total K decreased. However, the available N, P and K in the rhizosphere of the 7 kinds of halophytes except Phragmites communis Trin. behaved in such an opposite way that available N decreased but available P and available K increased. The ionic contents in the aboveground parts were higher than those in the underground parts of the 7 kinds of halophytes, in particular of both the succulent halophytes and the salt secreting halophytes. Accumulation of Cl– and Na+ in the aboveground parts of the plants was the most significant among that of the 8 major kinds of salt ions. |
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Keywords: | rhizosphere halophyte desert salt nutrient |
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