Pinus afforestation in South Brazilian highlands: soil chemical attributes and organic matter composition
DOI:
https://doi.org/10.1590/S0103-90162011000200007Keywords:
FTIR spectroscopy, humification, exchangeable cation, pastures, recalcitranceAbstract
In the last three decades, exotic tree species are being introduced in the natural pastures of the highlands located at the northeastern part of Rio Grande do Sul State (RS), Brazil. This alteration of land use may impart drastic changes in the soil attributes. In this context, this work aimed to evaluate the impact of Pinus taeda afforestation on soil chemical attributes and organic matter (SOM) composition in Leptosols from Campos de Cima da Serra, RS. Soil samples under eight year old (Pi8) and 30 year old (Pi30) Pinus plantations and under native pasture (NP) were studied. Contents of exchangeable cations and of micronutrients and soil pH were determined. The SOM composition was investigated by means of elemental analyses and FTIR spectroscopy. The soil under pasture had a higher content of nutrients and of SOM in comparison to Pinus soils, reflecting the higher input and decomposition rate of the below ground added residue in the grassland environment. The SOM in pasture soils showed a higher content of carbohydrate and of structures derived from microbial metabolism. Besides the depletion of nutrients and of SOM, Pinus afforestation affected the SOM quality: following afforestation, the proportion of chemically recalcitrant structures and of carboxylic groups increased, whereas N-containing groups decreased.Downloads
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Published
2011-04-01
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Section
Soils and Plant Nutrition
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Pinus afforestation in South Brazilian highlands: soil chemical attributes and organic matter composition . (2011). Scientia Agricola, 68(2), 175-181. https://doi.org/10.1590/S0103-90162011000200007