陆地息地的初级生产力和草食的生态系统层面模式
S J McNaughton1, M Oesterheld, D A Frank
1Biological Research Laboratories, Syracuse University, New York 13244-1220.
Nature
|September 14, 1989
概括
植物生产力是影响非洲生态系统草食动物动态和能量流动的关键因素. 这项研究强调了它在整合和指示整体食物网功能方面的作用.
科学领域:
- 生态生态学 生态生态学
- 生态系统动力学 生态系统动力学
- 食物网络 能量学 能量学
背景情况:
- 生态系统的结构是食物网,在食物层之间进行能量转移.
- 食物网结构在息地之间有所不同,但定量流动关系的理解较少.
- 非洲生态系统中的食草动物能量与降雨量和净初级生产率有关.
研究的目的:
- 为了研究食物网能量流之间的定量关系.
- 了解降雨,植物化学和消费者生理学等因素如何影响生态系统流动.
- 确定植物生产率是否作为生态系统功能过程的指标.
主要方法:
- 分析与植物生产率相关的草食生物质,消费和生产率数据.
- 对能源转移,热量水平和草食动物生理学的现有证据的审查.
- 从观察到的相关性推断生态系统的功能过程.
主要成果:
- 草食生物量,消费和生产率与植物生产率有很强的相关性.
- 植物的生产力似乎是整合各种生态系统过程的重要因素.
- 诸如降雨,食草动物呼吸成本和植物二次化学物质等因素会影响能量流动.
结论:
- 植物生产率是食物网中功能过程的主要整合和指标.
- 了解植物生产率对于预测生态系统动态和能源流动至关重要.
- 需要进一步的研究,以充分阐明生态现象的转化为生态系统流动.
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