Knowledge Resource Center for Ecological Environment in Arid Area
| Sampling Frequency for Semi-Arid Streams and Rivers: Implications for National Parks in the Sonoran Desert Network | |
| Lindsey;Melanie | |
| 出版年 | 2010 |
| 学位授予单位 | The University of Arizona. |
| 英文摘要 | In developing a water quality monitoring program, the sampling frequency chosen should be able to reliably detect changes in water quality trends. Three datasets are evaluated for Minimal Detectable Change in surface water quality to examine the loss of trend detectability as sampling frequency decreases for sites within the National Park Service's Sonoran Desert Network by re-sampling the records as quarterly and annual datasets and by superimposing step and linear trends over the natural data to estimate the time it takes the Seasonal Kendall Test to detect trends of a specific threshold. Wilcoxon Rank Sum analyses found that monthly and quarterly sampling consistently draw from the same distribution of trend detection times; however, annual sampling can take significantly longer. Therefore, even with a loss in power from reduced sampling, quarterly sampling of Park waters adequately detects trends (70%) compared to monthly whereas annual sampling is insufficient in trend detection (30%). |
| 英文关键词 | Sampling Frequency Seasonal Kendall Test Trend Analysis Water Quality |
| 语种 | 英语 |
| URL | http://hdl.handle.net/10150/193445 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/244751 |
| 推荐引用方式 GB/T 7714 | Lindsey;Melanie. Sampling Frequency for Semi-Arid Streams and Rivers: Implications for National Parks in the Sonoran Desert Network[D]. The University of Arizona.,2010. |
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