کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2025498 | 1069998 | 2008 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemical decomposition and fixation of nitrite in acidic pasture soils and implications for measurement of nitrification
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The fate of added 15N-labelled nitrite (15NO2â-N) was investigated in a laboratory experiment with two acidic pasture soils collected from northeast Victoria (Maindample and Ruffy) and an alkaline soil collected from Waurn Ponds, Victoria, Australia. Two and a half hours after mixing and extraction, the 15NO2â-N recovered in 2Â M KCl extracts was 22% and 33% of the applied NO2â in Maindample and Ruffy soils, respectively, and 100% in the Waurn Ponds soil. There was no difference in NO3â recovered with and without NaClO3 addition during this procedure, suggesting that biological oxidation of the applied NO2â was not the cause of the low recovery. Of the applied 15NO2â-N, 21% and 20% in the acidic Maindample and Ruffy soils, respectively, were recovered from the organic pool where it is believed to have been chemically fixed, leaving the total loss of 15NO2â as 57% and 47% from these two soils, most likely due to chemical self-decomposition to NO and NO2. When extracted with 0.005Â M KCl, the salt concentration used in the short-term nitrification assay (SNA) 51% and 42% of applied 15NO2â were recovered in the extract from Maindample and Ruffy soils, respectively, but the total losses were only 9% and 10% of the applied 15NO2â-N, respectively. The chemical fixation and self-decomposition of NO2â in acidic soils are likely to cause an underestimate of nitrification rates by SNA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 40, Issue 1, January 2008, Pages 262-265
Journal: Soil Biology and Biochemistry - Volume 40, Issue 1, January 2008, Pages 262-265
نویسندگان
A. Islam, D. Chen, R.E. White, A.J. Weatherley,