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Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
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识别无脊椎动物指标,用于评估森林头水流中的溪流持续时间
Ken M Fritz1, Roxolana O Kashuba2, Gregory J Pond3
1Office of Research and Development, United States Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268 USA.
概括
这项研究确定了水生和陆地无脊椎动物作为分类流量持续时间的可靠指标. 包括这些生物体提高了间歇性和长期的流量持续评估方法 (SDAMs) 的准确性.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 水文学的水文学
背景情况:
- 流量持续时间评估方法 (SDAM) 使用易于评估的流量属性作为直接流量持续时间测量的替代品.
- 无脊椎动物是SDAM中常用的指标,因为它们的移动性有限,在整个生命周期中流量要求各不相同.
研究的目的:
- 为了识别无脊椎动物的标志性间歇性与永久性流动.
- 为了比较不同分类学分辨率和数据类型 (存在/不存在,密度,生物质) 的有效性作为指标.
- 评估季节和息地类型对基于无脊椎动物的溪流流量分类的影响.
主要方法:
- 利用随机森林模型和水生和陆生无脊椎动物数据 (家族和属级) 的指标物种分析.
- 分析了来自四个美国II级生态区域的森林源流的370个样本,考虑了潮湿/干燥季节和侵蚀/沉积息地.
- 使用存在/缺席,密度和生物质数据评估指标强度.
主要成果:
- 随机森林模型实现了高分类准确度 (88.993.2%),密度数据显示略有更好的性能.
- 季节 (湿/干) 是比息地类型 (侵蚀性/沉积性) 更重要的流水流量类型预测因素.
- 确定了23种家族级或更高的种类和44种水生属作为潜在的指标,尽管许多种类发生在间歇性和多年性范围.
结论:
- 水生无脊椎动物和陆生无脊椎动物都可以作为评估流量持续时间的有效指标.
- 纳入更广泛的无脊椎动物,包括那些在间歇性范围发现的无脊椎动物,改善SDAMs.
- 无脊椎动物指标的预测能力因生态对干燥和区域物种组成的生态反应而因生态区域而异.
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