Greenhouse gas emissions from cattle dung depositions in two Urochloa forage fields with contrasting biological nitrification inhibition (BNI) capacity.
Greenhouse gas emissions from cattle dung depositions in two Urochloa forage fields with contrasting biological nitrification inhibition (BNI) capacity.
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DOI：
10.1016/j.geoderma.2021.115516
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发表时间：
2022-01-15
期刊：
影响因子：
6.1
通讯作者：
Chirinda N
中科院分区：
文献类型：
--
作者：
Lombardi B;Loaiza S;Trujillo C;Arevalo A;Vázquez E;Arango J;Chirinda N
牛粪是CO2、CH 4和N2 O排放的直接来源。牧草基因型影响CO2和CH 4排放量的粪便在干燥条件下。牧草基因型对减少粪便中N2 O排放没有影响。粪肥氮在根际的有限掺入限制了BNI效应。测定了粪块的甲烷和氧化亚氮排放因子。以放牧为基础的生产系统是由排泄物沉积引发的土壤温室气体排放的一个来源。采用具有生物硝化抑制（BNI）能力的Urophila牧草（以前称为臂形草）是减少排泄物斑块一氧化二氮（N2 O）排放的一种有前途的替代方案。然而，这种饲料如何影响排泄物斑块的甲烷（CH 4）或二氧化碳（CO2）排放仍不清楚。本研究调查了两种Urophila牧草下的土壤的潜在影响，对比BNI能力对牛粪沉积物的温室气体排放量。此外，N2 O和CH 4排放因子（EF）的牛粪在热带条件下的测定。牛放牧星星草（无BNI）的粪便沉积在两个饲料地块：Urostella杂交品种。Mulato和湿生乌罗藻（Uroplata humidicola cv.）Tully，分别具有低和高BNI容量。使用静态箱技术进行了两次温室气体监测试验。在试验1中监测了土壤和粪便特性以及温室气体排放。在试验2中，加入水来模拟降雨，并评估潮湿条件下的温室气体排放。我们的研究结果表明，粪补丁下，牧草基因型影响每日CO2和累积CH 4排放量在最干燥的条件下。然而，没有显着效果的饲料基因型被发现减轻N2 O排放量从粪便。我们归因于没有一个显着的BNI效应对N2 O排放量的有限公司的粪便N到土壤和根际的BNI效应发生。平均N2 O EFs为0.14%，接近不确定性范围（95%置信水平下为0.01-0.13%）。此外，每单位挥发性固体的CH 4排放系数平均为0.31 g CH 4 kgVS-1，略低于气专委制定的0.6 g CH 4 kgVS-1。这意味着需要投资于研究，以制定更多的区域特定的二级环境因子，包括对食用Urophila牧草的动物进行农场级研究，以考虑牧草选择对动物排泄物的温室气体排放的全面影响。
Cattle dung was a direct source of CO2, CH4 and N2O emissions. Forage genotype influenced CO2 and CH4 emissions from dung during the dry condition. No effect of forage genotype was found on mitigating N2O emissions from dung. The limited incorporation of dung-N into the rhizosphere restricted the BNI effect. Methane and nitrous oxide emission factors from dung patches were determined. Grazing-based production systems are a source of soil greenhouse gas (GHG) emissions triggered by excreta depositions. The adoption of Urochloa forages (formerly known as Brachiaria) with biological nitrification inhibition (BNI) capacity is a promising alternative to reduce nitrous oxide (N2O) emissions from excreta patches. However, how this forage affects methane (CH4) or carbon dioxide (CO2) emissions from excreta patches remains unclear. This study investigated the potential effect of soils under two Urochloa forages with contrasting BNI capacity on GHG emissions from cattle dung deposits. Additionally, the N2O and CH4 emission factors (EF) for cattle dung under tropical conditions were determined. Dung from cattle grazing star grass (without BNI) was deposited on both forage plots: Urochloa hybrid cv. Mulato and Urochloa humidicola cv. Tully, with a respectively low and high BNI capacity. Two trials were conducted for GHG monitoring using the static chamber technique. Soil and dung properties and GHG emissions were monitored in trial 1. In trial 2, water was added to simulate rainfall and evaluate GHG emissions under wetter conditions. Our results showed that beneath dung patches, the forage genotype influenced daily CO2 and cumulative CH4 emissions during the driest conditions. However, no significant effect of the forage genotype was found on mitigating N2O emissions from dung. We attribute the absence of a significant BNI effect on N2O emissions to the limited incorporation of dung-N into the soil and rhizosphere where the BNI effect occurs. The average N2O EFs was 0.14%, close to the uncertainty range (0.01–0.13% at 95% confidence level). Moreover, CH4 EFs per unit of volatile solid (VS) averaged 0.31 g CH4 kgVS−1, slightly lower than the 0.6 g CH4 kgVS−1 developed by the IPCC. This implies the need to invest in studies to develop more region-specific Tier 2 EFs, including farm-level studies with animals consuming Urochloa forages to consider the complete implications of forage selection on animal excreta based GHG emissions.
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影响因子：
6.6
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
6.2
作者：
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