Plant and Soil ( IF 3.9 ) Pub Date : 2022-04-11 , DOI: 10.1007/s11104-022-05426-0 Jerry C Dlamini 1, 2, 3 , L M Cardenas 2 , E H Tesfamariam 3 , R M Dunn 2 , J Evans 4 , J M B Hawkins 2 , M S A Blackwell 2 , A L Collins 2
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Purpose
Nitrous oxide (N2O) and methane (CH4) are some of the most important greenhouse gases in the atmosphere of the 21st century. Vegetated riparian buffers are primarily implemented for their water quality functions in agroecosystems. Their location in agricultural landscapes allows them to intercept and process pollutants from adjacent agricultural land. They recycle organic matter, which increases soil carbon (C), intercept nitrogen (N)-rich runoff from adjacent croplands, and are seasonally anoxic. Thus processes producing environmentally harmful gases including N2O and CH4 are promoted. Against this context, the study quantified atmospheric losses between a cropland and vegetated riparian buffers that serve it.
Methods
Environmental variables and simultaneous N2O and CH4 emissions were measured for a 6-month period in a replicated plot-scale facility comprising maize (Zea mays L.). A static chamber was used to measure gas emissions. The cropping was served by three vegetated riparian buffers, namely: (i) grass riparian buffer; (ii) willow riparian buffer and; (iii) woodland riparian buffer, which were compared with a no-buffer control.
Results
The no-buffer control generated the largest cumulative N2O emissions of 18.9 kg ha− 1 (95% confidence interval: 0.5–63.6) whilst the maize crop upslope generated the largest cumulative CH4 emissions (5.1 ± 0.88 kg ha− 1). Soil N2O and CH4-based global warming potential (GWP) were lower in the willow (1223.5 ± 362.0 and 134.7 ± 74.0 kg CO2-eq. ha− 1 year− 1, respectively) and woodland (1771.3 ± 800.5 and 3.4 ± 35.9 kg CO2-eq. ha− 1 year− 1, respectively) riparian buffers.
Conclusions
Our results suggest that in maize production and where no riparian buffer vegetation is introduced for water quality purposes (no buffer control), atmospheric CH4 and N2O concerns may result.
中文翻译：
有或没有不同植被河岸缓冲带的饲料玉米生产中的土壤 N2O 和 CH4 排放
目的
一氧化二氮 (N 2 O) 和甲烷 (CH 4 ) 是 21 世纪大气中最重要的温室气体之一。植被河岸缓冲区主要是因其在农业生态系统中的水质功能而实施的。它们在农业景观中的位置使它们能够拦截和处理邻近农田的污染物。它们回收有机物，增加土壤碳（C），拦截邻近农田富含氮（N）的径流，并且季节性缺氧。因此，促进了产生包括N 2 O和CH 4在内的对环境有害的气体的工艺。在此背景下，该研究量化了农田和为其服务的植被河岸缓冲区之间的大气损失。
方法
在包含玉米 ( Zea mays L.)的重复小区规模设施中测量了 6 个月的环境变量以及同时的 N 2 O 和 CH 4排放量。使用静态室来测量气体排放。种植由三个植被河岸缓冲区提供，即： (i) 草河岸缓冲区；(ii) 柳树河岸缓冲区；(iii) 林地河岸缓冲区，与无缓冲区对照进行比较。
结果
无缓冲控制产生最大累积 N 2 O 排放量，为 18.9 kg ha − 1（95% 置信区间：0.5–63.6），而玉米作物上坡产生最大累积 CH 4排放量（5.1 ± 0.88 kg ha − 1） 。基于土壤 N 2 O 和 CH 4的全球变暖潜势（GWP）在柳树（分别为 1223.5 ± 362.0 和 134.7 ± 74.0 kg CO 2 -eq. ha − 1年− 1）和林地（1771.3 ± 800.5 和分别为3.4 ± 35.9 kg CO 2 -eq. ha − 1年− 1 ) 河岸缓冲区。
结论
我们的结果表明，在玉米生产中，如果没有出于水质目的引入河岸缓冲植被（无缓冲控制），可能会导致大气中的 CH 4和 N 2 O 问题。
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