Anaerobically mineralized nitrogen within macroaggregates as a soil health indicator
| Autor: | Nicolás Wyngaard, Fernanda Covacevich, Nahuel I. Reussi-Calvo, Silvina San Martino, Gisela Vanesa García, Guillermo Alberto Studdert, María E. Campos |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Soil health
010504 meteorology & atmospheric sciences Soil test Soil organic carbon Bulk soil chemistry.chemical_element 04 agricultural and veterinary sciences Soil carbon Aggregate stability 01 natural sciences Nitrogen Soil quality Particulate organic carbon chemistry Environmental chemistry Soil water 040103 agronomy & agriculture Ciencias Agrícolas 0401 agriculture forestry and fisheries Environmental science Mollisol 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | CIC Digital (CICBA) Comisión de Investigaciones Científicas de la Provincia de Buenos Aires instacron:CICBA |
| ISSN: | 0341-8162 |
| Popis: | Anaerobically mineralized nitrogen (AN) in bulk soil (ANBS) has been described as a soil health indicator. Considering that large macroaggregates (2000–8000 μm, MA) are more sensitive to management practices than the bulk soil (i.e. whole soil), AN within MA (ANMA) would be a better soil health indicator than ANBS. The aim of this study was to evaluate if ANMA is a better indicator of: i) soil organic carbon (SOC) and particulate organic carbon (POC) in bulk soil (SOCBS and POCBS, respectively) and ii) aggregate stability (AS) than ANBS. Soil samples were taken at 0–5 and 5–20 cm from 46 continuously cultivated plots (CC) and a reference plot for each CC (pseudo-pristine, PRIS). These soils, located in the Argentinean Pampas, were classified as Mollisols with contrasting surface textural classes. The AS, SOCBS, POCBS, ANBS, SOC (SOCMA), and POC (POCMA) within MA and ANMA were determined separately at 0–5 and 5–20 cm soil depths and estimated at the 0–20 cm layer. The ANMA was a good indicator of SOCBS (R2 0.75, 0.48, and 0.61 at 0–5, 5–20 and 0–20 cm depths, respectively), POCBS (R2 0.66, 0.31, and 0.49, respectively), and AS (R2 0.80, 0.68, and 0.76, respectively). The ANMA performed similarly to predict SOCBS, POCBS, and AS as compared to ANBS, because ANMA was closely correlated to ANBS (r 0.90 at 0–20 cm). Since ANMA determination is more time-consuming than ANBS determination, its use as a soil health indicator would not be convenient. Therefore, the use of ANBS would be recommended over ANMA as a variable to monitor soil health. |
| Databáze: | OpenAIRE |
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