Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Revista Brasileira de Ciência do Solo

Fernando Palha Leite²  Ivo Ribeiro Silva¹  Roberto Ferreira Novais¹  Nairam Félix De Barros¹  Júlio César Lima Neves¹ 

[1] ,CENIBRA Departamento de Pesquisa em Solos e Silvicultura, Celulose Nipo-Brasileira

关键词: exchangeable cations;    fertilization;    nutrient exhaustion;    nutrient reserves;    cátions trocáveis;    exaustão de nutrientes;    fertilização;    reservas de nutrientes;   

DOI  :  10.1590/S0100-06832010000300024

来源: SciELO

【 摘 要 】

Little is currently known about modifications in edaphic characteristics caused by short-rotation eucalyptus and the impacts of these alterations on the sustainability of eucalyptus wood production. This study was carried out to identify theses changes at five sites of eucalyptus plantation in the region of the Rio Doce Valley, state of Minas Gerais, Brazil. Areas with more than three previous eucalyptus cycles, adjacent to pasture land or native forest, were chosen. Soil samples were collected and soil fertility analyzed by routine methods and other fractionation methods in order to measure alterations in the K, Ca and Mg contents as a consequence of eucalyptus cultivation. In the eucalyptus areas, reductions in the exchangeable Ca2+, Mg2+ and K+ contents and pH were observed and increased Al3+ and H + Al contents. Of all nutrients, only P contents (Mehlich-1 P) increased in the eucalyptus areas. The reduction in exchangeable forms and in medium-term soil nutrient pools indicates the need for higher nutrient rates than the currently applied in order to prevent nutritional limitations and soil nutrient exhaustion. After several eucalyptus rotations there was a recovery in the SOM content in comparison to degraded pasture soils, although not to the level of the native forest soil. The positive correlation between effective CEC and medium-term non-exchangeable Ca, Mg and K with SOM emphasizes the need for adequate fertilizer and plant residue management to sustain or even increase forest productivity in future cycles.

【 授权许可】

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