来自耕地和未经管理的自然生态系统的二氧化排放的空间变异性跨越一个大的环境梯度
Juan Manuel Piñeiro-Guerra1,2,3, Nuria A Lewczuk4, Tomás Della Chiesa1,5
1IFEVA, CONICET, Universidad de Buenos Aires, Facultad de Agronomía, Buenos Aires, Argentina.
Journal of environmental quality
|January 2, 2025
概括
与自然生态系统相比,农业土壤的二氧化 (N2O) 排放量是自然生态系统的两倍. 土地利用变化是主要的驱动因素,突出了迫切需要农田N2O减排战略的需要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 气候变化研究 气候变化研究
背景情况:
- 大气中的二氧化 (N2O) 是一种强大的温室气体,具有显著的全球变暖潜力.
- 基于土壤的N2O排放受到生物和非生物因素的影响,通常是由人为土地利用变化改变的.
- 用耕地取代自然生态系统可能会对N2O排放产生重大影响.
研究的目的:
- 与阿根廷取代的自然生态系统相比,评估各种农田的N2O排放的空间变化.
- 通过广泛的环境梯度,确定影响N2O排放的关键驱动因素.
- 为减轻农业用地N2O排放提供紧急管理实践的信息.
主要方法:
- 在阿根廷各地的九个不同地点,在两年内进行了农场现场测量.
- 农田 (玉米,大豆,小麦,甘) 的N2O排放与相邻的自然草原或森林相比较.
- 利用结构方程建模来确定N2O变化的关键驱动因素.
主要成果:
- 农业系统平均排放的N2O比自然生态系统多120%.
- 农田的土壤含水量高 (+9%),土壤温度高 (+3%),土壤酸盐高 (+19%),但氨含量低 (-33%).
- 土地利用被确定为N2O排放的主要驱动因素,直接影响土壤酸盐水平.
结论:
- 土地利用变化显著增加了农业土壤的N2O排放.
- 紧急的管理干预对于减少耕地N2O排放和缓解气候变化至关重要.
- 了解N2O变化的驱动因素是制定有效缓解策略的关键.
更多相关视频
相关概念视频
The Nitrogen Cycle
51.6K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
51.6K
Overview of Nitrogen Metabolism
7.8K
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...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.8K
The Carbon Cycle
37.0K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
37.0K
The Roles of Bacteria and Fungi in Plant Nutrition
35.0K
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
35.0K


