Low nitrate retention capacity in calcareous soil under woodland in the karst region of southwestern China
| Autor: | Christoph Müller, Tongbin Zhu, Siman Zeng, Hanlian Qin, Jinhua Cao, Hui Yang, Funing Lan, Kexin Zhou, Fen Huang |
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| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Soil Science Soil science 04 agricultural and veterinary sciences Mineralization (soil science) Karst 01 natural sciences Microbiology chemistry.chemical_compound Soil structure Agronomy Nitrate chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Nitrification Red soil Calcareous 0105 earth and related environmental sciences |
| Zdroj: | Soil Biology and Biochemistry. 97:99-101 |
| ISSN: | 0038-0717 |
| DOI: | 10.1016/j.soilbio.2016.03.001 |
| Popis: | A 15N-tracing study was conducted to investigate the gross N transformation rates involved in the production and consumption of NH4+ and NO3− in karst region soils (a calcareous and a red soil) from southwest China under woodland. The gross mineralization rate of organic N to NH4+ was much lower in calcareous soil (3.71 mg N kg−1 d−1) than in red soil (5.57 mg N kg−1 d−1), while the total gross nitrification rate was significantly higher in calcareous soil (5.80 mg N kg−1 d−1) than in red soil (0.70 mg N kg−1 d−1). Microbial NO3− immobilization accounted for 2.9% and 153% of the total nitrification in calcareous soil and red soils respectively. Thus the calcareous soils in the karst region have a low biological N retention capacity and high N losses, which are further aggravated by the high precipitation and fractured soil structure. |
| Databáze: | OpenAIRE |
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