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《Wetland》杂志刊登“质心收缩法在评价人工湿地向天然湿地演变中的应用”
发布时间: 2013-12-13   来源:

《Wetland》杂志刊登“质心收缩法在评价人工湿地向天然湿地演变中的应用”

作者:Martin A. Stapanian, Jean V. Adams, M. Siobhan Fennessy, John Mack, Mick Micacchion

刊物:《Wetland》,2013年8月

关键词:湿地;土壤化学;最近收缩因子;总有机碳;干重

摘要:人工所建湿地在结构或功能上是否与天然存在的湿地相同,这是长久以来困扰生态学者以及环保管理者的一个问题。实验检测了源自美国俄亥俄州10个人工建造湿地与9个天然湿地的19个相关变量指标。研究的主要目标是通过实测土壤性质参数以及植被完整度指数,确定可以用于湿地类型(人工或天然)判别的主要指标,以便通过这些指标对人工湿地向天然湿地的转变过程进行跟踪。利用最近质心收缩法建立湿地分类的最优指标体系,同时通过五倍交叉法计算分类误差。单位总碳和单位干重两项土壤指标的收缩差在聚类空间中距总体中心的距离最优。经交叉验证,基于以上两个指标湿地分类误差为11%。实验表明,总有机碳以及干重百分比两项指标可以作为俄亥俄州自然、人工湿地状态识别和湿地退化评价的表征指标。在环境科学中,质心收缩法在未来研究中具有良好的应用潜力。

Candidate Soil Indicators for Monitoring the Progress of Constructed Wetlands Toward a Natural State: A Statistical Approach

Authors:Martin A. Stapanian, Jean V. Adams, M. Siobhan Fennessy, John Mack, Mick Micacchion

Journal:《Wetland》,August 2013

keywords:Wetlands, Soil chemistry, Nearest shrunken centroids, Total organic carbon, Dry weight

Abstract:A persistent question among ecologists and environmental managers is whether constructed wetlands are structurally or functionally equivalent to naturally occurring wetlands. We examined 19 variables collected from 10 constructed and nine natural emergent wetlands in Ohio, USA. Our primary objective was to identify candidate indicators of wetland class (natural or constructed), based on measurements of soil properties and an index of vegetation integrity, that can be used to track the progress of constructed wetlands toward a natural state. The method of nearest shrunken centroids was used to find a subset of variables that would serve as the best classifiers of wetland class, and error rate was calculated using a five-fold cross-validation procedure. The shrunken differences of percent total organic carbon (% TOC) and percent dry weight of the soil exhibited the greatest distances from the overall centroid. Classification based on these two variables yielded a misclassification rate of 11 % based on cross-validation. Our results indicate that % TOC and percent dry weight can be used as candidate indicators of the status of emergent, constructed wetlands in Ohio and for assessing the performance of mitigation. The method of nearest shrunken centroids has excellent potential for further applications in ecology.

原文链接:http://link.springer.com/article/10.1007/s13157-013-0464-3

翻译:杨泽凡;审核:刘淼
 
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