Snapshot of Enteric Methane Emissions from Stocker Cattle Grazing Extensive Semiarid Rangelands

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Edward J. Raynor , Ashley Schilling-Hazlett , Sara E. Place , Juan Vargas Martinez , Logan R. Thompson , Melissa K. Johnston , Tamarah R. Jorns , Matthew R. Beck , Larry A. Kuehn , Justin D. Derner , Kimberly R. Stackhouse-Lawson
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Abstract

Enteric methane (CH4) emissions from cattle grazing extensive semiarid rangelands are largely unknown and represent a considerable knowledge gap for the beef cattle industry. Knowledge of baseline enteric CH4 emissions is beneficial for understanding the range of variability in individual animal emission production (g CH4 head [hd]−1 d−1) and emission intensity (g CH4 kg−1 average daily gain [ADG]−1). Here, we used field-based technology to determine enteric CH4 emissions from yearling steers grazing the North American shortgrass steppe in northeastern Colorado in midsummer 2022. Twenty-six animals were acclimated for 30 d (1−30 June) to the sampling equipment in the field before the measurement of emissions (1−31 July). Twelve (46%) yearling steers fully acclimated, with mean CH4 emissions ranging from 113.3 to 261.7 g hd−1 d−1 across the sampling period. Daily CH4 production values were 20% higher for steers (n = 9) from a local ranch compared with steers (n = 3) that originated from a mixed-grass prairie in south-central Nebraska (202.63 vs. 169.03 g CH4 hd−1 d−1). ADG of local steers was three times greater than their counterparts (0.54 vs. 0.18 kg hd−1 d−1), resulting in lower emission intensity (g CH4/ADG; emission intensity) from local steers compared with the naïve steers (237.6 vs. 418.5 emission intensity). In addition, we compared measured CH4 emissions with predicted emissions calculated using the Intergovernmental Panel on Climate Change tier 2 methodology; measured emissions were 31% greater than predicted for the local steers and 18% greater than steers from nonlocal steers. Results indicate that further research addressing grazing animal enteric CH4 emissions in extensive rangelands is needed. Further, efforts should be context specific for comparative efforts across rangeland ecosystems and animal origin to inform more accurate assessments of sustainability of grazing beef cattle related to greenhouse gas mitigation strategies.

放牧广阔半干旱牧场的蓄养牛的肠道甲烷排放量快照
大面积半干旱牧场上放牧的牛的肠道甲烷(CH4)排放量在很大程度上不为人所知,这也是肉牛业的一大知识空白。了解肠道甲烷(CH4)的基线排放量有利于了解动物个体排放量(克 CH4 头 [hd]-1 d-1)和排放强度(克 CH4 千克-1 平均日增重 [ADG]-1)的变化范围。在此,我们采用基于现场的技术,测定了 2022 年仲夏在科罗拉多州东北部北美矮草草原放牧的一岁犊牛的肠道甲烷排放量。在测量排放量之前(7 月 1-31 日),26 头牛在野外适应采样设备 30 天(6 月 1-30 日)。12头(46%)一岁牛完全适应后,在整个采样期间的平均 CH4 排放量为 113.3 至 261.7 g hd-1 d-1。与来自内布拉斯加州中南部杂草草原的母牛(n = 3)相比,来自当地牧场的母牛(n = 9)的日甲烷产生量高出 20%(202.63 vs. 169.03 g CH4 hd-1 d-1)。当地母牛的平均日增重(ADG)是同类母牛的三倍(0.54 vs. 0.18 kg hd-1 d-1),因此当地母牛的排放强度(g CH4/ADG; 排放强度)低于纯种母牛(237.6 vs. 418.5 排放强度)。此外,我们还将测得的甲烷排放量与采用政府间气候变化专门委员会第 2 级方法计算的预测排放量进行了比较;测得的排放量中,本地母牛的排放量比预测值高出 31%,比非本地母牛的排放量高出 18%。结果表明,需要进一步研究广阔牧场中放牧动物肠道的甲烷排放量。此外,应根据具体情况对不同牧场生态系统和动物来源进行比较,以便更准确地评估与温室气体减排战略相关的放牧肉牛的可持续性。
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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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