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Integrating beef cattle on cropland affects net global warming potential
Nutrient Cycling in Agroecosystems ( IF 3.1 ) Pub Date : 2021-05-30 , DOI: 10.1007/s10705-021-10150-9
M. A. Liebig , D. R. Faust , D. W. Archer , R. G. Christensen , S. L. Kronberg , J. R. Hendrickson , J. H. Lee , D. L. Tanaka

Recent interest in integrated crop-livestock (ICL) systems has prompted numerous investigations to quantify ecosystem service tradeoffs associated with management. However, few investigations have quantified ICL management effects on net global warming potential (GWP), particularly in semiarid regions. Therefore, we determined net GWP for grazed and ungrazed cropland in a long-term ICL study near Mandan, ND USA. Factors evaluated for their contribution to net GWP included carbon dioxide (CO2) emissions associated with production inputs and field operations, methane (CH4) emissions from enteric fermentation by beef cattle, change in soil carbon stocks, and soil-atmosphere CH4 and nitrous oxide (N2O) fluxes. Net GWP was significantly greater for grazed cropland (946 kg CO2equiv. ha-1 yr-1) compared to ungrazed cropland (200 kg CO2equiv. ha-1 yr-1) (P=0.0331). The difference in net GWP between treatments was largely driven by emissions from enteric fermentation (602 kg CO2equiv. ha-1 yr-1). Among other contributing factors, CO2 emissions associated with seed production and field operations were lower under ungrazed cropland (P = 0.0015 and 0.0135, respectively), while soil CH4 uptake was greater under grazed cropland (P = 0.0102). Soil-atmosphere N2O flux from each system negated nearly all the CO2equiv. sink capacity accrued from soil carbon stock change. As both production systems resulted in net greenhouse gas (GHG) emissions to the atmosphere, novel practices that constrain GHG sources and boost GHG sinks under semiarid conditions are recommended.



中文翻译:

将肉牛养殖在农田上会影响净全球变暖潜势

最近对综合作物-牲畜 (ICL) 系统的兴趣促使进行了大量调查,以量化与管理相关的生态系统服务权衡。然而,很少有研究量化 ICL 管理对净全球变暖潜能值 (GWP) 的影响,尤其是在半干旱地区。因此,我们在美国北卡罗来纳州曼丹附近的一项长期 ICL 研究中确定了放牧和未放牧农田的净 GWP。评估其对净 GWP 贡献的因素包括与生产投入和现场操作相关的二氧化碳 (CO 2 ) 排放、肉牛肠道发酵产生的甲烷 (CH 4 ) 排放、土壤碳储量的变化以及土壤-大气 CH 4和一氧化二氮(N 2O) 通量。净GWP是为放牧农田显著更大(946千克CO 2当量。公顷-1-1)相比ungrazed农田(200公斤CO 2当量。公顷-1-1)(P = 0.0331)。处理之间净 GWP 的差异主要是由肠道发酵(602 kg CO 2 equiv. ha -1 yr -1)的排放造成的。在其他影响因素中,未放牧耕地与种子生产和田间作业相关的CO 2排放量较低( 分别为P = 0.0015 和 0.0135),而放牧耕地下土壤 CH 4吸收量较高(P  = 0.0102)。来自每个系统的土壤-大气 N 2 O 通量几乎抵消了所有的 CO 2当量。土壤碳库变化产生的汇容量。由于这两种生产系统都会导致向大气中排放净温室气体 (GHG),因此建议采用在半干旱条件下限制 GHG 源并增加 GHG 汇的新做法。

更新日期:2021-05-30
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