ذخایر کربن در اکسیسول ها تحت کشاورزی و جنگل در آمازون جنوبی برزیل
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|149368||2017||39 صفحه PDF||سفارش دهید|
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Geoderma Regional, Volume 11, December 2017, Pages 53-61
We evaluated the initial effects of different agricultural management systems on carbon stocks in Oxisols in the southern Amazon and compared them to the adjacent native forest. Four management systems in a commercial area of grain production (soybeans in monoculture, summer soybeans with corn and Panicum milaceum as second crop, summer soybeans with corn and Urochloa brizantha as second crop, and summer soybeans with U. brizanthaÂ +Â Crotalaria juncea) were evaluated in a completely randomized design with five repetitions. It was found with removal of native vegetation and introduction of annual crops that there was a reduction of 30% (âÂ 8.1Â MgÂ haâÂ 1) in soil C stocks with the traditional management system of soybean monoculture/second crop corn. However, it is possible to maintain C stocks at levels comparable to the native vegetation with soy cultivation in summer and cover crops U. brizanthaÂ +Â C. juncea as second crop. With this strategy, there was storage of 0.2 and 0.12Â MgÂ haâÂ 1 C-CO2 per year at depths of 0â0.1Â m and 0.1â0.2Â m, respectively. In soybean monoculture/corn there was C-CO2 emission of 6.45 and 2.09Â MgÂ haâÂ 1Â yrâÂ 1 at depths of 0â0.1Â m and 0.1â0.2Â m, respectively. These results suggest that the practices traditionally used in commercial agricultural areas may not be sufficient to maintain C stocks in Amazon soil compared to the native vegetation. Therefore, large-scale management for low green-house gas emission (C-friendly agriculture) in the Amazon must be rethought and alternative strategies, such as rotation with pastures (e.g. integrated crop-livestock systems), should be adopted in order to preserve and/or increase C stocks, reducing the impact of CO2 emissions into the atmosphere.