| 生物土壤与生态 |
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| Distribution of Soil Nutrient Concentration in the Rhizosphere System of Desert Halophytes under Two Soil Conditions |
| YI Liang-peng1,2, MA Jian1, LI Yan1 |
| 1.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.Graduate School of the Chinese Academy of Science, Beijing 100039, China |
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Abstract Study on the distribution of rhizosphere nutrient is an important step in improving our understanding of desert halophytes. Improved understanding will enhance our ability to model nutrient dynamics and on a broader scale to develop effective method to spread desert halophytes. However, only limited attention has been focused on the rhizospheric soil of the halophytes in arid desert region, and still less is known about how rhizosphere nutritional distribution varies among plant species. Under the two soil conditions, four desert halophytes were planted in pots using horizontal root-mat technology. Soil samples were stratified collected by thin slicing the rhizosphere soil along the distance from the root plane of seedlings, and the pH value, available nitrogen(N), phosphorus(P) and potassium(K), exchangeable Ca and Mg contents were determined. The results showed that there existed a special gradient distribution of the pH and the contents of N, P, K, Ca and Mg along the distance from the root plane of the seedlings. The results showed that there existed a special gradient distribution of the pH and the contents of salt ions along the distance from the root plane of the seedlings. The pH decreased in the rhizosphere soil compared with the bulk soil and increased gradually and reached its background value of bulk soil in desert solonchak; there were not significant changes in the rhizosphere soil to cotton crop soil. There was a wide depletion zone of soil available N and exchangeable Mg near the root plane in two soil. The biggest depletion ratio of available N occurred at the site 3 mm from the root plane. For the available P and K,there existed a obvious depletion zone in the rhizosphere of cotton crop soil, but there was a accumulation in the rhizosphere of desert solonchak. Exchangeable Ca does not change significant in the rhizosphere soil to desert solonchak, but it increased in the rhizosphere of cotton crop soil. Available N and P in the aboveground part of the plant were more than underground part, especially for succulent halophytes and salt secrete halophyte.
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Received: 06 July 2007
Published: 20 May 2008
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2008, Vol. 28 
