Impact of land use on the chemical attributes of the soil, Cruzeiro do Sul, in the Brazilian Amazon
Camara, Rodrigo Silva, Luciélio Manoel Frade Junior, Elizio Ferreira Mattar, Eduardo Pacca Luna Silva, Sandra Bezerra da Silva Neto, Eduardo Carvalho da Pereira, Marcos Gervasio
Impact of land use on the chemical attributes of the soil, Cruzeiro do Sul, in the Brazilian Amazon
Publicação on-line; 34 ref.; 3 tables; 3 illus.; Summary (En)
ABSTRACT - Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the agricultural
frontier, which has resulted in soil exhaustion. It is therefore urgent to reduce deforestation and encourage sustainable land use
to promote social and economic development in the region. The aim of this study was to evaluate the impact of different land
use systems (an agroforestry system, cassava cultivation, non-degraded pasture, native forest) on the chemical properties of
the soil (0-40 cm) in the mesoregion of the Juruá Valley, in the state of Acre, Brazil. Principal component analysis showed the
soil in the forested area (reference) has greater values for P, Ca2+, Mg2+, K+, Na+, sum of bases, and cation exchange capacity;
while hierarchical cluster analysis suggested little dissimilarity to the soil in the agroforestry system, and high dissimilarity to
the soil in the areas of cassava cultivation and pasture. The results therefore support agroforestry as the most sustainable land
use system, compared to cassava cultivation or pasture.
Key words: Soil fertility. Amazon Rainforest. Cassava cultivation. Pasture. Multivariate analysis.
USO DA TERRA
ANÁLISE DO SOLO
PROPRIEDADE FÍSICO-QUÍMICA
MÉTODO ESTATÍSTICO
FERTILIDADE DO SOLO
IMPACTO AMBIENTAL
AMAZÔNIA
Impact of land use on the chemical attributes of the soil, Cruzeiro do Sul, in the Brazilian Amazon
Publicação on-line; 34 ref.; 3 tables; 3 illus.; Summary (En)
ABSTRACT - Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the agricultural
frontier, which has resulted in soil exhaustion. It is therefore urgent to reduce deforestation and encourage sustainable land use
to promote social and economic development in the region. The aim of this study was to evaluate the impact of different land
use systems (an agroforestry system, cassava cultivation, non-degraded pasture, native forest) on the chemical properties of
the soil (0-40 cm) in the mesoregion of the Juruá Valley, in the state of Acre, Brazil. Principal component analysis showed the
soil in the forested area (reference) has greater values for P, Ca2+, Mg2+, K+, Na+, sum of bases, and cation exchange capacity;
while hierarchical cluster analysis suggested little dissimilarity to the soil in the agroforestry system, and high dissimilarity to
the soil in the areas of cassava cultivation and pasture. The results therefore support agroforestry as the most sustainable land
use system, compared to cassava cultivation or pasture.
Key words: Soil fertility. Amazon Rainforest. Cassava cultivation. Pasture. Multivariate analysis.
USO DA TERRA
ANÁLISE DO SOLO
PROPRIEDADE FÍSICO-QUÍMICA
MÉTODO ESTATÍSTICO
FERTILIDADE DO SOLO
IMPACTO AMBIENTAL
AMAZÔNIA
BINAGRI