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題 名 | Comparing the Classification of Copper Concentrations in Taiwan Farmland Soils by Baseline Method and Finite Mixture Distribution Model=比較基線法與有限混合分佈模式對臺灣農田土壤中銅濃度的分級 |
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作 者 | 楊松岳; 張文亮; | 書刊名 | 農業工程學報 |
卷 期 | 52:2 民95.06 |
頁 次 | 頁23-29 |
分類號 | 434.223 |
關鍵詞 | 土壤污染; 銅; 背景值; 有限混合分布; Soil pollution; Copper; Background value; Finite mixture distribution; |
語 文 | 英文(English) |
中文摘要 | 基線法(Baseline Method, BM)通常用來描述土壤中重金屬的背景濃度,但是由於污染物質的移動,使取得未受人為干擾與影響的土壤樣本變得非常困難,特別是在都會與工業區。本研究的目的是以有限混合分佈模式(Finite Mixture Distribution Model, FMDM)來分級全台918個農田土壤樣本中銅的濃度並與傳統的基線法比較。本研究除了求出FMDM模式的參數與分級外,並進一步的計算每一種土壤被歸類在每一等級的比例。由這些結果計算出每一等級的擊中率(hit rate),並以數值的高低來判斷所代表的意義。與BM法相較,FMDM更適合描述重金屬銅在土壤中的分佈,而且模式的適合度是可以評估的,而BM則無法評估。此外,FMDM可以有效的解決BM在取樣過程中難以判斷取樣點是否有被污染的困難。特別是從環境風險評估的觀點來看的時候,當受人為影響與污染土壤在取樣中被包含進來時,BM會高估污染土壤的界定值導致低估了污染土壤的比例,而FMDM能有效的將大部分污染土壤從土壤樣本中分離出來。 |
英文摘要 | The baseline method (BM) is typically adopted to determine the background concentration of heavy metals in soils. The long-range transport of contaminants makes the sampling of undisturbed or unaffected soil difficult, thus making it difficult to determine the background concentration, especially in urban and industrial areas. This study adopted the finite mixture distribution model (FMDM) not only to classify Cu concentrations based on 918 representative Taiwan farmland soil samples, but also to compare the results with those obtained using a traditional BM. The parameters and classes of FMDM were obtained; the proportion of each soil in each class, and the hit rate of each class were calculated. The results showed that FMDM was more effective than BM in describing Cu distribution in soils, and the goodness of fit of FMDM could be evaluated, but that of BM could not. In addition, FMDM effectively overcame the difficulty of defining the background site. In particular, from the perspective of environmental risk assessment, BM underestimates the proportion of contaminated soil included during sampling; however, FMDM can effectively separate most of the contaminant soils from soil samples. |
本系統中英文摘要資訊取自各篇刊載內容。