CAMBIOS EN PROPIEDADES QUÍMICAS Y BIOQUÍMICAS DEL SUELO ASOCIADOS AL REEMPLAZO DE PASTIZALES NATURALES POR PINUS RADIATA D. DON Y ROTACIONES AGRÍCOLAS

DI GERÓNIMO, PAULA FLORENCIA; VIDELA, CECILIA; FERNÁNDEZ, MARÍA ELENA; ZAMUNER, ESTER CRISTINA; LACLAU, PABLO

Chilean journal of agricultural & animal sciences

Facultades de Agronomía, Ingeniería Agrícola y Ciencias Veterinarias de la Universidad de Concepción

Lugar: Concepción; Año: 2018 vol. 34 p. 89 - 101

 The replacement of native vegetation ofgrasslands by agriculture, or by afforestation, causes changes in theproperties of the soil, affecting its productivity. The objective of thisresearch was to study the changes in some edaphic properties generated by thefollowing changes in land use: 1) Natural grassland (PN) to agriculture (AGR);2) PN to afforestation with pines (MP); 3) Strips thinned within MP: secondarygrassland (PS). Soil samples were taken from each system, and both chemical andbiochemical properties were analyzed. All the systems recorded a reduction ofthe pH and an increase in the H+ saturation of the soil. An increase inthe total organic carbon (COT) was observed in MP and PS. The anaerobic Nmineralization potential (Nan) of these sites was much lower than that of PN,probably due to differences in the quality of their organic matter. PSgenerated a decrease in soil acidity, and an increase in Nan and P extractable.Acidification was lower in AGR, but it recorded the highest reduction in COT,Nan and P extractable. The changes observed indicate that the originalcharacteristics of the soil tend to recover quickly in places where introducedvegetation was replaced.