异质性促进恢复的草原中的弹性:对环境异质性假设的含义
Ashley A Wojciechowski1, John M Blair2, Scott L Collins3
1Kansas Biological Survey & Center for Ecological Research and Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, Kansas, USA.
概括
恢复的草原表现出与遗留草原相似的生产力和干旱敏感性. 在恢复区域中创造土壤异质性可以提高弹性和提高生产力,有助于生态系统恢复.
科学领域:
- 恢复生态恢复生态学
- 生态系统的弹性 生态系统的弹性
- 土壤异质性 土壤异质性
背景情况:
- 提高退化土地的生态系统弹性是恢复生态的关键目标.
- 对恢复生态系统和参考生态系统进行比较的长期实验对于理解弹性恢复和机制至关重要.
- 土壤异质性在恢复生态系统弹性中的作用仍在调查中.
研究的目的:
- 为了量化生态系统功能恢复恢复的草原相对于剩余的草原.
- 为了比较恢复和残余草原的抗旱能力与自然干旱.
- 测试土壤异质性是否增强恢复的草原的弹性.
主要方法:
- 利用了实验性草原恢复数据与土壤异质性操纵和两个可比的剩余草原遗址.
- 在自然干旱期间和之后测量地面净初级生产率 (ANPP),以评估敏感性和遗留效应.
- 在恢复 (同质和异质土壤) 和遗留草原之间比较ANPP变化.
主要成果:
- 在非干旱年份的恢复和剩余草原之间,ANPP总量相似,尽管草原和草原的生产力不同.
- 总ANPP的干旱敏感性是可比的,但恢复的草原草更敏感.
- 恢复的草原表现出更积极的干旱后遗留效应,特别是在异质的土壤条件下,由于禁止ANPP.
结论:
- 草原的恢复可以恢复生态系统的生产力,干旱的敏感性类似于剩余的草原.
- 恢复的草原中的土壤异质性促进了土壤的生产力,并提高了对干旱的整体弹性.
- 创造土壤异质性是改善恢复生态系统弹性的一个有希望的策略.
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