AGRICULTURAL PRODUCTION
; EFFICIENCY
; CARBON
; FERTILIZER
; FOOTPRINT
WOS学科分类:
Thermodynamics
; Energy & Fuels
WOS研究方向:
Thermodynamics
; Energy & Fuels
英文摘要:
Maize is the most important staple crop in Mexico and is cultivated under varied agro-climatic and socioeconomic conditions. The aim of this study is to estimate energy use, cumulative exergy consumption (CExC), and greenhouse gas (GHG) emissions of different maize production systems as proxies to compare their resource use and environmental performance. Based on average values, per-hectare energy use, energy intensity (El), energy output-input ratio (ER), and net energy (NE) are in the range of 2.3 -40.2 GJ ha(-1), 1.8-8.5 MJ kg(-1), 1.7-12.0, and 163-73.1 GJ ha(-1), respectively. Per-hectare CExC, exergy intensity (ExI), exergy output-input ratio (ExR), and net exergy (NEx) are in the range of 2.5-52.1 GJ ha(-1), 1.9-10.7 MJ kg(-1), 1.6-14.1, and 19.6-86.8 GJ ha(-1), respectively. Per-hectare GHG emissions, GHG intensity (GHGI), and GHG per unit energy input (GHGE(i)) are in the range of 152.9-3475.8 kg CO(2)e ha(-1), 116.5-601.9 kg CO(2)e Mg-1, and 63.1-117.2 kg CO(2)e GJ(-1), respectively. Low-input rain-fed production systems perform better in EI, ER, ExI, ExR, GHGI, and GHGE(i) though, they also show the lowest NE and NEx due to poor yields. High-input surface irrigated production systems have the highest NE and NEx coupled with medium values of EI, ExI, and GHGI due to high productivity. (C) 2018 Elsevier Ltd. All rights reserved.
1.Univ Nacl Autonoma Mexico, Coordinac Ingn Sistemas, Inst Ingn, Ciudad Univ, Mexico City 04510, DF, Mexico 2.Univ Zaragoza, Dept Mech Engn, Maria de Luna St,Campus Rio Ebro, Zaragoza 50018, Spain 3.Univ Zaragoza, CIRCE Inst, Maria de Luna St,Campus Rio Ebro, Zaragoza 50018, Spain
Recommended Citation:
Juarez-Hernandez, Sergio,Uson, Sergio,Sheinbaum Pardo, Claudia. Assessing maize production systems in Mexico from an energy, exergy, and greenhouse-gas emissions perspective[J]. ENERGY,2019-01-01,170:199-211