草原在地面上方的净初级生产率和降雨利用效率对改变的降雨模式的不同反应,以过程为基础的模型为基础
Chen Cheng1, Lu Wu2,3, Hongyan Liu3
1College of Ecology, Lishui University, Lishui, China.
Frontiers in plant science
|February 14, 2025
概括
降水变化对水限草原有重大影响. 降雨量减少对地面净初级生产 (ANPP) 有负面影响,而降雨量增加对其有利,草原反应各不相同.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 农业科学 农业科学
背景情况:
- 草原生态系统服务对降水模式敏感.
- 对于水资源有限的地区来说,了解这些影响至关重要.
研究的目的:
- 量化评估降水情景如何影响草原生产力.
- 分析不同草原类型的降水变化对ANPP和PUE的影响.
主要方法:
- 使用了与历史天气和观测数据校准的APSIM模型.
- 进行了场景模拟,以调查降水对ANPP和PUE的影响.
- 使用来自内蒙古草原,典型和沙漠草原的数据验证了模型.
主要成果:
- 澳大利亚天然气发电厂对降水减少比增加更为敏感.
- 典型的草原对降水量增加做出了最好的反应;沙漠草原显示了降水量减少的最大ANPP下降.
- 生长季降水对ANPP的影响更大,而休眠季降水对PUE的影响更大.
结论:
- 降水时间,特别是在中期生长季节,对于ANPP来说至关重要.
- 如果在生长季节的早期发生,未来降水量增加可能会使典型的沙漠草原和沙漠草原受益最多.
- 研究结果支持在降雨模式变化下优化草原管理策略.
更多相关视频
相关概念视频
Adaptations that Reduce Water Loss
25.1K
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.
25.1K
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
Predator-Prey Interactions
16.1K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
16.1K
Light Acquisition
8.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.4K
Production Efficiency
16.7K
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).
16.7K
Responses to Heat and Cold Stress
13.3K
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.
13.3K


