相关实验视频

Updated: Jan 11, 2026

The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

碳和甲流来自美国东南部典型的牧场式肉牛生产系统

Rosvel Bracho¹, Maria L Silveira², Joao M B Vendramini³

¹Range Cattle Research and Education Center, University of Florida, Ona, FL, 33865, USA; School of Forests, Fisheries, and Geomatics Sciences, University of Florida, Gainesville, FL, 32611, USA.

The Science of the total environment

|November 19, 2025

概括

耕种的牧场比本土牧场捕获更多的二氧化碳 (CO2),但本土牧场在极端天气条件下提供更大的稳定性. 这两种系统都有助于减轻温室气体排放.

科学领域:

生态生态学生态生态学
气候科学气候科学
农业科学农业科学

背景情况:

牧场覆盖了地球表面的四分之一,提供了重要的生态系统服务,如碳捕获.
佛罗里达州的牧场面积约为200万公,对该州的畜牧业至关重要.

研究的目的:

评估美国东南部两个不同的牛肉生产系统的生态系统净碳交换 (二氧化碳和甲).
为了在不同气候条件下比较原生牧场和耕种牧场之间的碳捕获和温室气体减排潜力.

主要方法:

一项为期三年的研究,测量了本土牧场和耕放牧场的生态系统净生产率 (NEP) 和总碳平衡.
包括各种气候事件,包括干旱和风,以评估系统的弹性.

主要成果:

与本地牧场 (-1.75 Mg C ha-1 yr-1) 相比,耕种牧场的年度碳吸收显著更高 (NEP平均值为 -4.91 Mg C ha-1 yr-1).
尽管牧场的甲排放量较高,但二氧化碳吸收量较大导致了更有利的整体碳平衡 (-6.26 Mg C-CO2eqv ha−1 vs. -3.55 Mg C-CO2eqv ha−1).
本地牧场在极端气候条件下 (干旱和风) 显示出更大的NEP和碳平衡稳定性.

结论:

耕种牧场和本土牧场都具有显著的温室气体减排潜力.
耕种的牧场提供了更高的碳捕获率,而本地牧场在气候变化期间提供了至关重要的稳定性和一致的碳捕获.
保持两种牧场类型的马赛克对于优化生态系统服务和在牧场系统中减缓气候变化至关重要.

关键词:

牛肉类牛的牛肉类牛.生态系统的碳平衡.埃迪的共变性埃迪共变性温室气体排放量排放量温室气体排放量甲甲是一种

更多相关视频

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Published on: July 19, 2018

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

相关概念视频

Overview of Nitrogen Metabolism

Overview of Nitrogen Metabolism

Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Production Efficiency

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

Inorganic Nitrogen Assimilation

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...