Greenhouse gas balance and carbon footprint of beef cattle in three contrasting pasture-management systems in Brazil
Greenhouse gas balance and carbon footprint of beef cattle in three contrasting pasture-management systems in Brazil
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DOI：
10.1016/j.jclepro.2016.03.132
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发表时间：
2017-01-20
影响因子：
11.1
通讯作者：
La Scala, Newton, Jr.
中科院分区：
文献类型：
--
作者：
de Figueiredo, Eduardo Barretto;Jayasundara, Susantha;La Scala, Newton, Jr.
综合系统已被确定为一种有效的土地管理战略，用于恢复全世界的退化地区，增加作物和牛肉产量，并为土壤和树木中的碳（C）固存提供技术潜力，作为抵消养牛产生的CH 4和N2 O排放的一种选择。我们的研究的目的是估计温室气体（GHG）平衡和肉牛（育肥周期）在巴西的Brachiaria牧场的三个对比生产情景-1）退化牧场（DP），2）管理牧场（MP），和3）作物-牲畜-森林综合系统（CLFIS）提出了新的替代土地利用作为温室气体减排战略的碳足迹。10年期间，按面积计算的温室气体排放总量最高的是蒙特利尔议定书（84，541千克二氧化碳当量公顷），其次是气候和森林信息系统（64，519千克二氧化碳当量公顷）和发展中国家（8004千克二氧化碳当量公顷）。我们的研究结果表明，肉牛碳足迹最高的是DP，18.5 kg CO（2）eq/kg LW（活重），其次是CLFIS中的12.6 kg CO（2）eq/kg LW和MP中的9.4 kg CO（2）eq/kg LW，未考虑MP（土壤C）和CLFIS（土壤和桉树C）中碳封存的技术潜力。考虑到MP和CLFIS的土壤碳固存潜力，肉牛的碳足迹可以分别减少到7.6和-28.1千克CO2当量/千克LW。将退化的牧场转化为管理良好的牧场和采用CLFIS可减少相关的温室气体排放量（以每公斤牛活重排放的二氧化碳当量千克数计），增加肉类、谷物和木材的产量。这一减少主要是由于牧场的改善和牛产量的增加，以及为土壤和生物量中的碳汇提供技术潜力，以抵消与牛有关的排放。(C)2016爱思唯尔有限公司版权所有
Integrated Systems (IS) have been identified as an efficient land-management strategy for restoring degraded areas worldwide, increasing crops and beef yields and providing technical potential for carbon (C) sequestration in soil and trees as an option for offsetting CH4 and N2O emissions from cattle production. The aim of our study is to estimate the greenhouse gas (GHG) balance and the C footprint of beef cattle (fattening cycle) in three contrasting production scenarios on the Brachiaria pasture in Brazil-1) degraded pasture (DP), 2) managed pasture (MP), and 3) the crop-livestock-forest integrated system (CLFIS) presenting new alternatives of land use as a GHG mitigation strategy. Area-scaled total GHG emissions were highest in MP (84,541 kg CO(2)eq ha(-1)), followed by CLFIS (64,519 kg CO(2)eq ha(-1)) and DP (8004 kg CO(2)eq ha(-1)) over a 10-yr period. Our results note that the highest C footprint of beef cattle was in the DP, 18.5 kg CO(2)eq per kg LW (live weight), followed by 12.6 kg CO(2)eq per kg LW in the CLFIS and 9.4 kg CO(2)eq per kg LW in the MP, without taking into account the technical potential for C sequestration in MP (soil C) and CLFIS (soil and Eucalyptus C). Considering the potential for soil C sequestration in the MP and CLFIS, the C footprint of beef cattle could be reduced to 7.6 and -28.1 kg CO(2)eq per kg LW in the MP and CLFIS, respectively. The conversion of the degraded pasture to a well-managed pasture and the introduction of CLFIS can reduce their associated GHG emissions in terms of kg CO(2)eq emitted per kg of cattle LW produced, increasing the production of meat, grains and timber. This reduction is primarily due to pasture improvement and increases in cattle yields and the provision of technical potential for C sinks in soil and biomass to offset cattle-related emissions. (C) 2016 Elsevier Ltd. All rights reserved.