Heavy metal contamination risk in agricultural fields has attained considerable importance in recent years especially due to harmful effects on food safety and the ecosystem. The purpose of this present research is to assess the heavy metal contamination risk of some micro-catchments, where tea cultivation has been taken place of Rize province in the Eastern Black Sea Region, by taking into consideration three different approaches. For this aim, 96 soil samples were collected from 29 micro-catchments at a depth of 0–20 cm to evaluate heavy metal concentrations and risk levels of soils. After that, some analyzes were performed to find out the correlation between Cd, Cu, Co, Ni, Zn, Pb and Cr concentrations and physico-chemical properties of soils to determine the risk contamination indices of heavy metal contents and enrichment factor, geo-accumulation index and contamination factors due to natural or anthropogenic effects. According to the study results, the order of the mean heavy metals identified in the soils was determined as Zn > Cu > Cr > Ni > Pb > Co > Cd. On the other hand, according to all three contamination risk models, Cd was identified as the riskiest element in terms of contamination in the catchments, where tea cultivation has been carried out. Also, when the statistical relationship between some physico-chemical characteristic of soils and heavy metals examined, it was identified that a significant positive correlation between clay content of soils and pH, and Cd and Zn, respectively. However, the OM value was positively correlated with Pb and negatively correlated with Co.

中文翻译：

---

利用多种污染指数评价湿润环境下微流域茶园土壤重金属污染的风险

近年来，特别是由于对食品安全和生态系统的有害影响，农业领域的重金属污染风险已变得相当重要。本研究的目的是通过考虑三种不同的方法来评估一些微流域的重金属污染风险，这些微流域已经在东部黑海地区的里泽省进行了茶树种植。为此，从29个微流域收集了96个土壤样本，深度为0–20 cm，以评估重金属浓度和土壤的风险水平。然后进行分析，找出Cd，Cu，Co，Ni，Zn，Pb和Cr浓度与土壤理化性质之间的相关性，以确定重金属含量和富集因子的风险污染指数；自然或人为影响造成的地理累积指数和污染因子。根据研究结果，确定土壤中重金属的平均顺序为Zn> Cu> Cr> Ni> Pb> Co> Cd。另一方面，根据所有三种污染风险模型，在进行茶树栽培的流域中，镉被确定为最危险的元素。而且，当检查土壤的某些理化特性与重金属之间的统计关系时，可以确定土壤的粘土含量与pH值以及Cd和Zn之间存在显着的正相关。但是，OM值与Pb正相关，与Co负相关。