Greenhouse gases emission from soils under major crops in Northwest India
Greenhouse gases emission from soils under major crops in Northwest India
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DOI：
10.1016/j.scitotenv.2015.10.073
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发表时间：
2016-01-15
影响因子：
9.8
通讯作者：
Singha, J. P.
中科院分区：
文献类型：
--
作者：
Jain, N.;Arora, P.;Singha, J. P.
农业温室气体排放的量化对于编制国家清单和制定缓解战略是必要的。2008-2010年，在印度新德里印度农业研究所的实验农场进行了实地试验，以量化谷物、豆类、小米和油籽作物土壤中氧化亚氮（N2O）、甲烷（CH4）和二氧化碳（CO2）的排放。不同作物类型N2O累计排放总量差异显著（P < 0.05）。N2O排放量占施氮量的比例以豆类最高（0.67%），其次是油籽（0.55%）、小米（0.43%）和谷物（0.40%）。排放量随施氮量的增加而增加（r(2) = 0.74, P < 0.05）。不同作物土壤CH4的累积通量为28.64 +/- 4.40 kg ha(-1)，而CO2的平均季节综合通量为3058 +/- 236 ~ 3616 +/- 157 kg CO2 ha（-1）。农作物的全球变暖潜能值（GWP）在3053 kg CO2当量公顷（-1）（鸽豆）和3968 kg CO2当量公顷（-1）（小麦）之间变化。碳当量排放（CEE）以豇豆最少（833 kg C ha(-1)），小麦最大（1042 kg C ha(-1)）。每单位经济产量的GWP以豆类作物最高，谷类作物最低。排放值的不确定度在4.6 ~ 22.0%之间。这些排放值将有助于更新印度农业的温室气体排放清单。(C) 2015 Elsevier B.V.版权所有
Quantification of greenhouse gases (GHGs) emissions from agriculture is necessary to prepare the national inventories and to develop the mitigation strategies. Field experiments were conducted during 2008-2010 at the experimental farm of the Indian Agricultural Research Institute, New Delhi, India to quantify nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2) emissions from soils under cereals, pulses, millets, and oilseed crops. Total cumulative N2O emissions were significantly different (P > 0.05) among the crop types. Emission of N2O as percentage of applied N was the highest in pulses (0.67%) followed by oilseeds (0.55%), millets (0.43%) and cereals (0.40%). The emission increased with increasing rate of N application (r(2) = 0.74, P < 0.05). The cumulative flux of CH4 from the rice crop was 28.64 +/- 4.40 kg ha(-1), while the mean seasonal integrated flux of CO2 from soils ranged from 3058 +/- 236 to 3616 +/- 157 kg CO2 ha(-1) under different crops. The global warming potential (GWP) of crops varied between 3053 kg CO2 eq. ha(-1) (pigeon pea) and 3968 kg CO2 eq. ha(-1) (wheat). The carbon equivalent emission (CEE) was least in pigeon pea (833 kg C ha(-1)) and largest in wheat (1042 kg C ha(-1)). The GWP per unit of economic yield was the highest in pulses and the lowest in cereal crops. The uncertainties in emission values varied from 4.6 to 22.0%. These emission values will be useful in updating the GHGs emission inventory of Indian agriculture. (C) 2015 Elsevier B.V. All rights reserved.