Granulometric and oxidizable carbon fractions of soil organic matter in crop-livestock integration systems
| Autor: | Marcos Gervasio Pereira, Roni Fernandes Guareschi, Vanessa Aparecida Freo, João de Andrade Bonetti, Eduardo Carvalho da Silva Neto, Wanderlei Bieluczyk |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Soil test
chemistry.chemical_element 010501 environmental sciences 01 natural sciences Pasture Grazing Organic matter lcsh:Agriculture (General) 0105 earth and related environmental sciences chemistry.chemical_classification Intensidades de pastejo geography geography.geographical_feature_category Ecology Soil organic matter 04 agricultural and veterinary sciences Soil carbon Urochloa ruziziensis Fracionamento da MOS lcsh:S1-972 chemistry Agronomy Oxisol 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science General Agricultural and Biological Sciences Cerrado Carbon |
| Zdroj: | Semina: Ciências Agrárias, Vol 38, Iss 2, Pp 607-622 (2017) |
| ISSN: | 1679-0359 |
| Popis: | The identification of the labile and recalcitrant forms of soil organic matter (SOM) allows to rapidly define, or even predict if the management used favors increments or losses of carbon in the soil. Thus, the objective of this work was to assess the effects of different grazing intensities and soybean crops on the oxidizable and granulometric fractions of the SOM in a crop-livestock integration combined with no-tillage system (CLI-NTS), established in 2009 in the Goiás Federal University. The treatments consisted of three different pasture heights (0.25 m P25; 0.35 m P35; 0.45 m P45), and areas without grazing (AWG), and a native vegetation area of the Cerrado biome (NCA), adjacent to the experimental area, was evaluated as references and compared with the cultivated areas. Soil samples (Oxisol - USDA; typic distroferric Red Latosol - SiBCS) were collected in the layers 0.00-0.05; 0.05-0.10 0.10-0.20 and 0.20-0.40 m of each area, and arranged in a completely randomized experimental design with six replications. The soil total carbon was quantified (TC) by dry combustion. The SOM granulometry and oxidizable SOM were fractionated into particulate carbon (OCp), carbon bond with minerals (OCm) and four oxidizable fractions with increasing degrees of recalcitrance (F1 < F2 < F3 < F4). These soil attributes were evaluated at two different times, representing the post-pasture cycle (PP) and post-soybean crop (PC) periods. The lower contents of total soil carbon (TC) were found in the F1 and F3 fractions of the area without grazing, suggesting that the crop-livestock integration increases the organic matter content in the soil surface layer regardless of the pasture height. The areas without grazing and with different pasture heights in CLI had similar contents of OCp and OCm due to the experiment short time of implementation (3 years). The fractionation of the oxidizable SOM was more sensitive in differentiating the treatments, showing that the higher intensity of grazing used (P25) provided a better balance of carbon accumulation between the SOM labile and recalcitrant fractions. |
| Databáze: | OpenAIRE |
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