台灣東部蛇紋岩母質化育土壤地區重金屬特性之初探

Preliminary Study on Heavy Metal Characteristics in Serpentinite-developed Soil Regions in Eastern Taiwan

劉滄棽(Tsang-Sen Liu) ； 郭鴻裕(Horng-Yuh Guo) ； 朱戩良(Jiang-Liung Chu) ； 連深(Shen Lian)

《台灣農業研究》 56卷2期 (2007/06) Pp. 65-78

https://doi.org/10.6156/JTAR/2007.05602.01

摘要

本研究初步分析台灣東部蛇紋岩母質化育土壤區之岩體、土壤、溪水及藻類中的重金屬含量特徵，並探討其對農業環境潛在之影響。結果顯示，蛇紋岩化育土壤之重金屬組成特徵沿襲其母質之特性，具有高重金屬含量及低Ca/Mg比之特性。由三處受不同風化程度之土壤剖面的pH 和鎳、鉻及鈷測值顯示，由於不同程度的風化作用，這些土壤的pH 值分布在4.5~6.5。風化程度越高之地區顯示有較高之重金屬有效性，且鎳、鈷的有效性高於鉻。由於本研究顯示台灣東部蛇紋岩化育土之pH 偏酸，且研究區內溪水及溪流中藻類中之鎳亦有高含量現象，因此建議在東部蛇紋岩化育土壤地區之農業應注意是否有重金屬含量過高的疑慮。

關鍵字

蛇紋石化育土壤 ； 重金屬 ； 台灣東部

並列摘要

Characteristics of heavy metal contents in rocks, soils, creeks, and algae have been preliminarily analyzed in serpentinite-developed soil regions in eastern Taiwan for understanding the potential effect of heavy metals on agriculture environments in this area. The results showed that the serpentinite-developed soils with high content of heavy metals and low Ca/Mg ratios are similar to their parent rocks. Soil profile analyses of pH and contents of nickel, chromium, and cobalt at three sampling sites indicated that the pH of these serpentinite-developed soils was affected by degree of weathering. These soils exhibited acid feature with the pH ranging from 4.5~6.5 depending on the extent of weathering. High-weathered regions with lower pH value had the greater availability of heavy metals than that in low-weathered regions with higher pH value. The availability of nickel and cobalt in each sampling site was greater than that of chromium. Our results suggested that the agriculture in serpentinite-developed soil regions in eastern Taiwan should pay more attention to the potential hazard of heavy metals because the soil pH values were low and the nickel contents were high in creek waters and algae in this area.

並列關鍵字

Serpentinite-developed soil ； Heavy metal ； Eastern Taiwan