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Analysis of soybean cropland expansion in the southern Brazilian Amazon and its relation to economic drivers

机译:巴西南部亚马逊地区大豆农田扩张及其与经济驱动因素的关系分析

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ABSTRACT The agricultural dynamics of soybean expansion have long been recognized as a major driver of excessive land cover change on the southwestern border of the Brazilian Amazon. The hypothesis that the soybean market exerts an influence on land use was investigated by the association between economic indicators and soybean crop dynamics in the state of Mato Grosso (western Brazil). We integrated a historical series of satellite data of soybean cropland expansion and the two main economic variables (selling prices and production costs) for soybean in Mato Grosso. We focused on the relation between profit (the difference between the average soybean price and production costs) and land-use transition to soybean from 2001 to 2013. The spatially explicit analysis showed that the overall accuracy between the resulting first-time use and the most recent soybean crop area in 2013 was 96.75%, with a Kappa index of 0.63. However, dissimilar values found between Omission and Commission indicators suggest that most of the expanded areas prior to 2013 (5.57 million ha) were under a high dynamical range of land uses. Although there is no direct relation between either the deforestation rate or expansion trends (first-time-use rate) and profit, the results strongly suggest (R 2 =0.81) that profit exerts a direct and non-negligible influence on the evolution of consolidated land use for soybean in Mato Grosso State.
机译:摘要长期以来,人们一直认为大豆扩张的农业动力是巴西亚马逊河西南边界土地覆盖率过度变化的主要驱动力。通过在马托格罗索州(巴西西部)的经济指标与大豆作物动态之间的联系,研究了大豆市场对土地利用产生影响的假说。我们整合了历史系列的大豆耕地扩张卫星数据以及马托格罗索州大豆的两个主要经济变量(销售价格和生产成本)。我们着重研究了2001年至2013年利润(大豆平均价格与生产成本之间的差异)与土地利用向大豆的过渡之间的关系。空间显式分析显示,首次使用和最首次使用之间的总体准确性2013年的近期大豆收成率为96.75%,卡伯指数为0.63。但是,在“遗漏”指标和“委员会”指标之间发现的不同值表明,2013年之前的大多数扩展区域(557万公顷)处于动态变化很大的土地利用范围内。尽管森林砍伐率或扩张趋势(首次使用率)与利润之间没有直接关系,但结果强烈表明(R 2 = 0.81),利润对合并森林的演变产生直接且不可忽略的影响马托格罗索州大豆的土地利用。

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    《Acta amazonica》 |2017年第4期|共页
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