在地面初级生产的时间动态中,生物群之间的变化
概括
地表初级净产量 (ANPP) 在草原和旧田地变化最大,在森林中变化最小. 这种变化是由生物群特定的生长率和降水模式驱动的,而不仅仅是总体降水水平.
科学领域:
- 生态生态学 生态生态学
- 生态系统科学 生态系统科学
- 全球变化生物学
背景情况:
- 使用来自北美11个长期生态研究地点的12年数据,评估了地面净初级生产 (ANPP) 的年度间变化.
- 对比ANPP在多种生物群的变化,包括草原,老田和森林.
相关概念视频
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All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.
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
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).
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