Chemical composition and stocks of soil organic matter in a south Brazilian oxisol under pasture

Journal of the Brazilian Chemical Society

Embrapa Agropecuária Oeste, Dourados, Brazil¹  Institute of Chemistry Porto Alegre, Porto Alegre, Brazil¹  Jacques, Aino V. A.¹  Tomazi, Michely¹  Dick, Deborah P.¹  Bayer, Cimélio¹  Federal University of Rio Grande do Sul, Bento Gonçalves¹  Santana, Graciele S.¹ 

关键词: physical pools;    soil amendment;    pasture burning;    chemical recalcitrance;   

DOI  :  10.5935/0103-5053.20130108

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

This study evaluated the chemical composition and distribution patterns of soil organic matter (SOM) of Oxisol under native pasture without burning for the last 41 years (NP), native pasture without burning for the last eight years (BP), native pasture in soil amended by liming and fertilization and without burning for the last 41 years (AP), and native forest (NF). Stocks of carbon (C) and nitrogen (N) in the whole soil and in physical pools were determined and SOM composition was investigated by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis. Among the pasture environments, AP presented the greatest C and N stocks in soil and in the light fractions. The heavy fraction of BP presented the greatest aromaticity index, and this can be related to the presence of pyrogenic carbon. Concerning soil carbon accumulation, AP represents a sustainable alternative in relation to the practice of vegetation burning in the management of native pastures in southern Brazil.

【 授权许可】

Unknown