Soil gross nitrogen transformations in forestland and cropland of Regosols
Abstract Soil gross nitrogen (N) transformations could be influenced by land use change, however, the differences in inherent N transformations between different land use soils are still not well understood under subtropical conditions. In this study, an 15N tracing experiment was applied to determi...
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Online Access: | https://doi.org/10.1038/s41598-020-80395-x |
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doaj-877ed8a8f9e44beaae583a3259889d8e2021-01-10T12:48:40ZengNature Publishing GroupScientific Reports2045-23222021-01-0111111110.1038/s41598-020-80395-xSoil gross nitrogen transformations in forestland and cropland of RegosolsXiao Ren0Jinbo Zhang1Hamidou Bah2Christoph Müller3Zucong Cai4Bo Zhu5Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of SciencesSchool of Geography Sciences, Nanjing Normal UniversityKey Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of SciencesInstitute of Plant Ecology, Justus-Liebig University GiessenSchool of Geography Sciences, Nanjing Normal UniversityKey Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of SciencesAbstract Soil gross nitrogen (N) transformations could be influenced by land use change, however, the differences in inherent N transformations between different land use soils are still not well understood under subtropical conditions. In this study, an 15N tracing experiment was applied to determine the influence of land uses on gross N transformations in Regosols, widely distributed soils in Southwest China. Soil samples were taken from the dominant land use types of forestland and cropland. In the cropland soils, the gross autotrophic nitrification rates (mean 14.54 ± 1.66 mg N kg−1 day−1) were significantly higher, while the gross NH4 + immobilization rates (mean 0.34 ± 0.10 mg N kg−1 day−1) were significantly lower than those in the forestland soils (mean 1.99 ± 0.56 and 6.67 ± 0.74 mg N kg−1 day−1, respectively). The gross NO3 − immobilization and dissimilatory NO3 − reduction to NH4 + (DNRA) rates were not significantly different between the forestland and cropland soils. In comparison to the forestland soils (mean 0.51 ± 0.24), the cropland soils had significantly lower NO3 − retention capacities (mean 0.01 ± 0.01), indicating that the potential N losses in the cropland soils were higher. The correlation analysis demonstrated that soil gross autotrophic nitrification rate was negatively and gross NH4 + immobilization rate was positively related to the SOC content and C/N ratio. Therefore, effective measures should be taken to increase soil SOC content and C/N ratio to enhance soil N immobilization ability and NO3 − retention capacity and thus reduce NO3 − losses from the Regosols.https://doi.org/10.1038/s41598-020-80395-x |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiao Ren Jinbo Zhang Hamidou Bah Christoph Müller Zucong Cai Bo Zhu |
spellingShingle |
Xiao Ren Jinbo Zhang Hamidou Bah Christoph Müller Zucong Cai Bo Zhu Soil gross nitrogen transformations in forestland and cropland of Regosols Scientific Reports |
author_facet |
Xiao Ren Jinbo Zhang Hamidou Bah Christoph Müller Zucong Cai Bo Zhu |
author_sort |
Xiao Ren |
title |
Soil gross nitrogen transformations in forestland and cropland of Regosols |
title_short |
Soil gross nitrogen transformations in forestland and cropland of Regosols |
title_full |
Soil gross nitrogen transformations in forestland and cropland of Regosols |
title_fullStr |
Soil gross nitrogen transformations in forestland and cropland of Regosols |
title_full_unstemmed |
Soil gross nitrogen transformations in forestland and cropland of Regosols |
title_sort |
soil gross nitrogen transformations in forestland and cropland of regosols |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2021-01-01 |
description |
Abstract Soil gross nitrogen (N) transformations could be influenced by land use change, however, the differences in inherent N transformations between different land use soils are still not well understood under subtropical conditions. In this study, an 15N tracing experiment was applied to determine the influence of land uses on gross N transformations in Regosols, widely distributed soils in Southwest China. Soil samples were taken from the dominant land use types of forestland and cropland. In the cropland soils, the gross autotrophic nitrification rates (mean 14.54 ± 1.66 mg N kg−1 day−1) were significantly higher, while the gross NH4 + immobilization rates (mean 0.34 ± 0.10 mg N kg−1 day−1) were significantly lower than those in the forestland soils (mean 1.99 ± 0.56 and 6.67 ± 0.74 mg N kg−1 day−1, respectively). The gross NO3 − immobilization and dissimilatory NO3 − reduction to NH4 + (DNRA) rates were not significantly different between the forestland and cropland soils. In comparison to the forestland soils (mean 0.51 ± 0.24), the cropland soils had significantly lower NO3 − retention capacities (mean 0.01 ± 0.01), indicating that the potential N losses in the cropland soils were higher. The correlation analysis demonstrated that soil gross autotrophic nitrification rate was negatively and gross NH4 + immobilization rate was positively related to the SOC content and C/N ratio. Therefore, effective measures should be taken to increase soil SOC content and C/N ratio to enhance soil N immobilization ability and NO3 − retention capacity and thus reduce NO3 − losses from the Regosols. |
url |
https://doi.org/10.1038/s41598-020-80395-x |
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