Influence of Soil Properties in Different Management Systems: Estimating Soybean Water Changes in the Agro-IBIS Model

Earth Interactions

Geovane Webler c^1^2^3^4^5¹  Debora Regina Roberti c^1^2^3^4^5²  Luiz Antonio Candido b^1^2^3^4^5³  Marcelo Bortoluzzi Diaz c^1^2^3^4^5⁴  Virnei Silva Moreira a^1^2^3^4^5⁵ 

[1] Centro de Previsão de Tempo e Clima (CPTEC/INPE), Cachoeira Paulista, São Paulo, Brazil^4;Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil^3;Instituto Nacional de Pesquisas da Amazônia, Manaus, Amazonas, Brazil^2;Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil^5;Universidade Federal do Pampa, Itaqui, Rio Grande do Sul, Brazil^1

关键词: In situ observations;    Land surface model;    Model evaluation/performance;   

DOI  :  10.1175/EI-D-16-0033.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

The water balance in agricultural cropping systems is dependent on the physical and hydraulic characteristics of the soil and the type of farming, both of which are sensitive to the soil management. Most models that describe the interaction between the surface and the atmosphere do not efficiently represent the physical differences across different soil management areas. In this study, the authors analyzed the dynamics of the water exchange in the agricultural version of the Integrated Biosphere Simulator (IBIS) model (Agro-IBIS) in the presence of different physical soil properties because of the different long-term soil management systems. The experimental soil properties were obtained from two management systems, no tillage (NT) and conventional tillage (CT) in a long-term experiment in southern Brazil in the soybean growing season of 2009/10. To simulate NT management, this study modified the top soil layer in the model to represent the residual layer. Moreover, a mathematical adjustment to the computation of leaf area index (LAI) is suggested to obtain a better representation of the grain fill to the physiological maturity period. The water exchange dynamics simulated using Agro-IBIS were compared against experimental data collected from both tillage systems. The results show that the model well represented the water dynamics in the soil and the evapotranspiration (ET) in both management systems, in particular during the wet periods. Better results were found for the conventional tillage management system for the water balance. However, with the incorporation of a residual layer and soil properties in NT, the model improved the estimation of evapotranspiration by 6%. The ability of the Agro-IBIS model to estimate ET indicates its potential application in future climate scenarios.

【 授权许可】

Unknown