干旱地对气候变化的敏感性和使用非线性动态的可变性
Takehiro Sasaki1, Scott L Collins2, Jennifer A Rudgers2
1Graduate School of Environment and Information Sciences, Yokohama National University, Hodogaya, Yokohama 240-8501, Japan.
概括
草原的生产力表现出对气候变化的复杂反应,因地区和时间而异. 了解这些非线性,依赖状态的关系对于预测生态系统对气候的反至关重要.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 时间序列分析 时间序列分析
背景情况:
- 初级生产力对气候的反应是暂时可变的,这表明国家依赖的相互作用.
- 以前的研究经常使用基于方程的模型,忽视了生态动态的非线性性质.
研究的目的:
- 使用无方程方法揭示草原生产率对气候变化和可变性的敏感性模式.
- 为了澄清驱动这些依赖国家的生产力反应的潜在机制.
主要方法:
- 分析了来自蒙古48个草原地区40年的气候和生产力数据.
- 应用非线性时间序列分析,避免基于方程的模型.
主要成果:
- 生产力对半热地区的降水产生了积极的反应,对干旱地区的降水产生了负面反应.
- 温度呈现出相反的模式,而干旱程度的下降对生产力产生了负面影响.
- 年间变化反应因地区而异,温度变化一般提高生产力.
结论:
- 强调生产率对气候变化的非线性,国家依赖的敏感性的重要性.
- 确定时间延迟的气候影响和物种的抗压能力作为关键机制.
- 强调需要准确预测生物圈对气候系统的反.
相关概念视频
What is Climate?
18.6K
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.
18.6K
Responses to Drought and Flooding
10.7K
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.
10.7K
Global Climate Change
24.5K
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.
24.5K
Adaptations that Reduce Water Loss
25.7K
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.
25.7K
Responses to Heat and Cold Stress
13.6K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.6K
Feedback control systems
343
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
343


