Abstract
Several studies indicate that the use of integrated production systems, such as integrated crop-livestock-forest systems (ICLF), improves the quality of the soil and consequently the sequestration of organic carbon in the soil. In this way, this work aims to evaluate the carbon stocks in soil under different management systems in the Cerrado/Amazonia transition zone, namely: ICLF, no-tillage, pasture and eucalyptus plantation. For this, two soil samplings were done in 2011 and 2014, in the 0 - 5, 5 - 10 and 10 - 30 cm layers. Soil carbon and nitrogen stocks were analyzed. ICLF system was the treatment that obtained the highest percentage of carbon gain (7.8%) after three years of establishment which represents to an increase of 5.5 Mg·ha-1. Management systems, such as ICLF, with minimal soil disturbance combined with crop rotations that contribute to the quantity and quality of residues input, increase soil organic matter content. Carbon stock data show the potential of ICLF systems to increase soil carbon stocks.
Highlights
Management systems, such as integrated crop-livestock-forest systems (ICLF), with minimal soil disturbance combined with crop rotations that contribute to the quantity and quality of residues input, increase soil organic matter content
After three years of cultivation, ICLF presented the highest increase of carbon concentration (15%) in the 0 - 5 cm layer, followed by Eucalyptus (13%), Pasture (9%) and No-tillage (8%)
This higher availability of total carbon and nutrients, mainly in the soil surface layer (0 - 5 cm) could contribute to higher amounts of microbial biomass and activity promoted by ICLF system
Summary
According to the projections of the Intergovernmental Panel on Climate Change (IPCC), the agricultural sector will be greatly affected by global climate change with impacts on its productivity, management and spatial distribution of crops. During UNFCCC COP 15 (15th Conference of the Parties under United Nations Framework Convention on Climate Change) in Copenhagen, Brazil undertakes a voluntary national commitment to reduce GHG emissions. This commitment was to reduce by 36.1% and 38.9% the 2020 projected emissions. For The fulfillment of the commitment, the Brazilian government created several mitigation and adaptation plans for different sectors of the economy, among them are the Low Carbon Agriculture Plan
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