SPATIAL UNCERTAINTY OF NUTRIENT LOSS BY EROSION IN SUGARCANE HARVESTING SCENARIOS

Revista Brasileira de Ciência do Solo

Patrícia Gabarra Mendonça¹  João Fernandes Da Silva Júnior¹  Ismênia Ribeiro De Oliveira¹  Daniel De Bortoli Teixeira¹  Mara Regina Moitinho¹  Marcílio Vieira Martins Filho¹  José Marques Júnior¹  Gener Tadeu Pereira¹ 

关键词: green cane harvesting;    burnt cane harvesting;    geostatistics;    landforms;    sequential Gaussian simulation;    cana crua;    cana queimada;    empobrecimento do solo;    geoestatística;    pedoformas;    simulação sequencial gaussiana;   

DOI  :  10.1590/01000683rbcs20140432

来源: SciELO

【 摘 要 】

The assessment of spatial uncertainty in the prediction of nutrient losses by erosion associated with landscape models is an important tool for soil conservation planning. The purpose of this study was to evaluate the spatial and local uncertainty in predicting depletion rates of soil nutrients (P, K, Ca, and Mg) by soil erosion from green and burnt sugarcane harvesting scenarios, using sequential Gaussian simulation (SGS). A regular grid with equidistant intervals of 50 m (626 points) was established in the 200-ha study area, in Tabapuã, São Paulo, Brazil. The rate of soil depletion (SD) was calculated from the relation between the nutrient concentration in the sediments and the chemical properties in the original soil for all grid points. The data were subjected to descriptive statistical and geostatistical analysis. The mean SD rate for all nutrients was higher in the slash-and-burn than the green cane harvest scenario (Student’s t-test, p<0.05). In both scenarios, nutrient loss followed the order: Ca>Mg>K>P. The SD rate was highest in areas with greater slope. Lower uncertainties were associated to the areas with higher SD and steeper slopes. Spatial uncertainties were highest for areas of transition between concave and convex landforms.

【 授权许可】

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