کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2024791 1542623 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phosphorus mineralization can be driven by microbial need for carbon
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
پیش نمایش صفحه اول مقاله
Phosphorus mineralization can be driven by microbial need for carbon
چکیده انگلیسی

Despite the importance of phosphorus (P) mineralization to maintain soil fertility, little is known about the mechanisms that regulate microbial P mineralization. We tested the hypothesis that microbial P mineralization can be driven by microbial need for carbon (C). For this purpose, net microbial uptake kinetics of 14C and 33P from glucose-6-phosphate were studied in a Leptosol depending on availability of C, nitrogen (N), and P. After 60 h of incubation, 16.4% of the 14C from glucose-6-phosphate was recovered in the microbial biomass, while 33P incorporation into the microbial biomass was a third less. The higher net uptake of 14C than of 33P from the glucose-6-phosphate indicates that soil microorganisms use the organic moiety of phosphorylated organic compounds as a C source, but only use a small proportion of the P. Hence, they mineralize P without incorporating it. Our finding that the net uptake of 14C and 33P in the soils amended with inorganic P did not differ from the control treatment indicates that P mineralization was not driven by microbial need for P but rather for C. In a second experiment with three temperate forest soils we found that the activity of 14C from glucose-6-phosphate in soil solution decreased faster than the activity of 33P from glucose-6-phosphate. This might suggest that higher net uptake of C than of P from glucose-6-phosphate can also be observed in other temperate forest soils differing in C, N, and P contents from the Leptosol of the main experiment. In conclusion, the experiments show that microbial P mineralization can be a side-effect of microbial C acquisition from which plants potentially can benefit.


► Microbial uptake of 14C and 33P from glucose-6-phosphate in soil was studied.
► After 60 h, 16.4% of the 14C, but only 5.6% of the 33P were recovered in microbial biomass.
► After 10 d, 33P recovery in the microbial biomass increased only up to 13.8%.
► Microbial uptake of 33P and 14C from glucose-6-phosphate was independent of P availability.
► We conclude that P mineralization can be driven by microbial need for C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 61, June 2013, Pages 69–75
نویسندگان
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