| 生物土壤与生态 |
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| Microorganisms and Its Biological Activity in Rhizospheric Soil around Desert Plants at the Lower Reaches of Tarim River, Xinjiang, China |
| WANG Wei-xia1, LUO Ming2, PAN Cun-de1 |
| 1.College of Forestry, Xinjiang Agricultural University, Urumqi 830052, China; 2.College of Agronomy, Xinjiang Agricultural University, Urumqi 830052, China |
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Abstract The microbial population, community composition and biological activity in rhizospheric soil of seven kinds of typical dominant desert plants at the lower reaches of Tarim River were studied. The results indicated that the rhizospher of the desert plants were quite different from non-rhizosphere in microbial population and composition, and rhizosphere effect is obvious. Several desert plants, such as Lycium ruthenicum, Tamarix hispida, Karelinia caspica and Halostashys caspica, showed obvious positive rhizosphere effects, with R/S values varied from 1.26 to 150.42, and the positive rhizosphere effect of Lycium ruthenicum was the most obvious; On the contrary Alhagi sparsifolia, Apocynum venetum and Hexinia polydichotoma showed negative rhizosphere effects. The physiological groups of ammonifiers and cellulosed ecomposing bacteria also exhibited remarkable positive rhizosphere effect, while the nitrobacteria could not be examined. The desert plants could improve biological activity of urease and alkaline phosphatase in the rhizospheric soil. However, the effects of desert plants on soil respiration intensity and biological activity of the hydrogen peroxide were different. In conclusion, desert plants play important role in increasing rhizospheric soil microbial population and biological activity, promoting the accumulation of soil fertility and transformation of plant nutrient, and maintaining desert ecosystem function. The shrubs was superior relatively to the herbs in rhizopheric effect, so they could be considered as the prior selection for vegetation restoration in desert regions.
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Received: 10 October 2009
Published: 20 May 2010
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2010, Vol. 30 
