水文变化控制了印度东部以大米为基础的作物系统的温室气体排放
L Arenas-Calle1, S Sherpa2, D Rossiter1
1School of Integrative Plant Science, Soil and Crop Sciences, Cornell University, Ithaca, NY, USA.
概括
减少大米种植产生的甲 (CH4) 排放是至关重要的. 印度东部的水文变化显著影响温室气体 (GHG) 排放,需要定制的缓解策略.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 农业产生的甲 (CH4) 排放,特别是大米种植,是温室气体减排的主要优先事项.
- 目前对大米的甲减少策略往往忽视了农民面临的复杂的水资源管理现实.
- 在印度东部普遍存在的季风养大米系统中的水文变化,创造了影响排放的各种现场条件.
研究的目的:
- 描述印度东部季风大米田的水文变化.
- 用DNDC模型在观察到的水文条件下估计温室气体 (GHG) 排放.
- 确定该地区温室气体排放的主要驱动因素.
主要方法:
- 在两年 (2021年,2022年) 的两年间,对207个季风大米田进行了实地水文监测.
- 使用脱分解 (DNDC) 模型,基于观察到的水文模式来模拟温室气体排放.
- 统计集群被用来识别不同的田间水文模式.
主要成果:
- 每年确定五个不同的田间水文集群,尽管模式在不同年份之间有所不同.
- 2021年的温室气体 (GHG) 排放量是2022年的两倍,突出显著的年度间气候影响.
- 洪水持续时间,作物残留物管理和应用被确定为排放的主要驱动因素.
结论:
- 水文复杂性和可变性是影响印度东部大米温室气体排放的关键因素.
- 缓解策略必须考虑到这种变化,才能有效和准确.
- 了解跨景观和季节的排放分布对于有针对性的温室气体减排工作至关重要.
相关概念视频
Responses to Drought and Flooding
10.6K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.6K
What is Climate?
18.4K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.4K
Adaptations that Reduce Water Loss
25.4K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.4K
Global Climate Change
24.3K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.3K
Precipitation Processes
437
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
437
The Calvin Benson Cycle
4.5K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.5K


