Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 0514027 |
| DISSERTATION RESEARCH: Temporal Dynamics of Alternative Stables States in a Desert Stream | |
| Stuart Fisher | |
| 主持机构 | Arizona State University |
| 开始日期 | 2005-06-15 |
| 结束日期 | 2007-05-31 |
| 资助经费 | 11300(USD) |
| 项目类别 | Standard Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | ECOSYSTEM STUDIES |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | Understanding the response of ecological systems to disturbance is a central problem in ecology, and is of fundamental importance to management of ecosystems from local to global scales. Two major theories of disturbance are stability theory, which describes the rate of return of ecosystems to pre-disturbance conditions, and multiple state theory, which describes the transition of ecosystems between alternative equilibrium conditions (e.g., grassland vs. shrubland, etc.). Because desert streams are subject to frequent and severe disturbance in the form of both flood and drying, these ecosystems provide excellent models for understanding the response of ecosystems to disturbance more generally. Prior to the end of the 19th century, wetlands (cienegas) were a common feature of the Southwestern U.S. Erosion of these wetlands left most arid streams as bare, gravelbed channels (arroyos) that represent an alternative equilibrium. Recent observations of wetland re-establishment at a long-term ecological study site (Sycamore Creek, AZ) provides an opportunity to evaluate how the alternative configurations of desert streams respond to disturbances using the context of stability theory. Following flash flood disturbance, we will measure primary production and ecosystem respiration in both wetland and gravelbed sites to determine whether these alternative stable states differ in their response to disturbance. The Intellectual Merit of this proposal lies in this integration of single- and multiple-equilibrium theories of ecosystem response to disturbance. The Broader Impact of this research will be to improve conservation and restoration efforts of this formerly-widespread and now-rare wetland ecosystem, and to provide opportunities for training of graduate students in the design, execution, and analysis of ecological studies. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=0514027 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/341327 |
| 推荐引用方式 GB/T 7714 | Stuart Fisher.DISSERTATION RESEARCH: Temporal Dynamics of Alternative Stables States in a Desert Stream.2005. |
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