AI Article Synopsis
- - The study focused on how applying manure affects net nitrification rates (NNRs), heavy metal concentrations (HMCs), and the abundance of specific bacteria involved in nitrogen cycling in soil.
- - Results showed that NNRs significantly increased in the manure-treated soils compared to controls, with optimal conditions found at pH 7 and 30°C.
- - Heavy metal concentrations in manure soils indicated varying levels of pollution, and while some metals positively correlated with NNRs, others had negative correlations, highlighting the complex relationship between manure application, heavy metals, and nitrifying bacteria.
Article Abstract
In this study, we determined the effect of manure application on net nitrification rates (NNRs), heavy metal concentrations (HMCs), and abundance of ammonia-oxidizing archaea (AOA)/bacteria (AOB), and nitrite-oxidizing bacteria (NOB) in soil. HMCs were measured by atomic absorption spectroscopy. Abundance of AOA, AOB, and NOB was enumerated by q-PCR. NNRs ranged from 2.8 to 14.7 mg kg h and were significantly (p < 0.05) increased in manure soils as compared to control soils. NNRs were affected by pH 7 and temperature 30°C. Cd, Fe and Pb concentrations were classified as excessively polluted, moderate contamination and slight pollution, respectively, in the manure soils. NNRs and concentrations of Fe and Pb were significantly (p < 0.00) positive correlated, but Cu and Cd were significantly (p < 0.00) negative correlated with NNRs. Application of manure significantly (p < 0.05) increased HMCs (Fe, Cu, and Pb), which have indirect and direct effects on NNRs and nitrifying bacteria.
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| http://dx.doi.org/10.1007/s00128-021-03112-y | DOI Listing |
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