کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8365221 | 1542619 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microbial gross organic phosphorus mineralization can be stimulated by root exudates - A 33P isotopic dilution study
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
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![عکس صفحه اول مقاله: Microbial gross organic phosphorus mineralization can be stimulated by root exudates - A 33P isotopic dilution study Microbial gross organic phosphorus mineralization can be stimulated by root exudates - A 33P isotopic dilution study](/preview/png/8365221.png)
چکیده انگلیسی
Phosphorus (P) is one of the most important nutrients for plant growth. While most studies on microbial P mobilization, i.e. on mineralization of organic P and solubilization of inorganic P, focus on mycorrhiza, P mobilization by non-mycorrhizal microorganisms in soil is little explored. In this study we address the question whether root exudates stimulate organic P mineralization by non-mycorrhizal microorganisms. A 33P isotopic dilution approach was applied to investigate microbial gross P mineralization in top- and subsoil horizons of three forest soils differing in P concentrations (Leptosol, Podzol, and Cambisol). To simulate the effects of root exudates on microbial gross P mineralization, glucose, alanine, and methionine were added in rhizosphere-relevant concentrations (12Â mg carbon (C)Â gâ1 soil organic C). Based on 33P isotopic dilution we showed that glucose and alanine addition increased gross P mineralization rates up to a factor of 20 and 31, respectively. In contrast, methionine had little effect on microbial gross P mineralization rates. Phosphatase activity was increased most strongly due to the addition of alanine and glucose by factors of up to 6 and 4, respectively. Fifteen days after addition of artificial root exudates, microbial P concentrations and 33P recovery in the microbial biomass were only slightly and not consistently changed. In conclusion, the results show that alanine and glucose can stimulate microbial gross P mineralization and phosphatase activity, and that structure and stoichiometry of root exudates significantly shape the extent of stimulation of microorganisms. Our study indicates that stimulation of non-mycorrhizal microorganisms by root exudates might be an important strategy of plants to increase the availability of P in soils.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 65, October 2013, Pages 254-263
Journal: Soil Biology and Biochemistry - Volume 65, October 2013, Pages 254-263
نویسندگان
Marie Spohn, Anton Ermak, Yakov Kuzyakov,