Water retention and availability in soils of the State of Santa Catarina-Brazil: effect of textural classes, soil classes and lithology

Revista Brasileira de Ciência do Solo

André Da Costa²  Jackson Adriano Albuquerque¹  Adriano Da Costa¹  Patricia Pértile¹  Franciani Rodrigues Da Silva¹ 

[1] ,Federal University of Santa MariaSanta Maria RS ,Brazil

关键词: field capacity;    permanent wilting point;    available water capacity;    particle size;    mixed models;    capacidade de campo;    ponto de murcha permanente;    água disponível;    granulometria;    modelos mistos;   

DOI  :  10.1590/S0100-06832013000600010

来源: SciELO

【 摘 要 】

The retention and availability of water in the soil vary according to the soil characteristics and determine plant growth. Thus, the aim of this study was to evaluate water retention and availability in the soils of the State of Santa Catarina, Brazil, according to the textural class, soil class and lithology. The surface and subsurface horizons of 44 profiles were sampled in different regions of the State and different cover crops to determine field capacity, permanent wilting point, available water content, particle size, and organic matter content. Water retention and availability between the horizons were compared in a mixed model, considering the textural classes, the soil classes and lithology as fixed factors and profiles as random factors. It may be concluded that water retention is greater in silty or clayey soils and that the organic matter content is higher, especially in Humic Cambisols, Nitisols and Ferralsol developed from igneous or sedimentary rocks. Water availability is greater in loam-textured soils, with high organic matter content, especially in soils of humic character. It is lower in the sandy texture class, especially in Arenosols formed from recent alluvial deposits or in gravelly soils derived from granite. The greater water availability in the surface horizons, with more organic matter than in the subsurface layers, illustrates the importance of organic matter for water retention and availability.

【 授权许可】

CC BY   
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