CAJ | 학술논문

通过土壤采样对成都平原崇州市平原区农地土壤镉含量特征及来源进行分析，结果表明，研究区土壤镉含量在0.16~0.77 mg·kg-1之间，平均为0.33 mg·kg-1，高出国家土壤环境质量二级标准10%，样点超标率30.43%。研究区土壤镉总体上处于中等程度的潜在生态风险，对人体的致癌风险尚处于可接受的范围。成土母质、土属类型、水系、农地利用方式和主要交通道路对土壤镉含量变异的独立解释能力分别为20.71%、24.70%、25.68%、12.62%和10.58%，即研究区土壤镉受自然地质过程和人为活动因素的综合影响，自然地质过程对土壤镉含量的主控作用总体上大于人为活动因素。水系和交通道路的影响范围分别主要在其4.0 km和1.5 km范围内。自然地质过程和人为活动因素对土壤镉含量的主控作用在距离水系4.0 km前后发生改变：距离水系4.0 km范围内，自然地质过程的主控作用明显大于人为活动因素；距离水系4.0 km之外，人为活动因素则是最重要的控制因素。研究结果为深化对成都平原土壤镉污染机制的认识和镉污染防控提供了参考。
통과토양채양대성도평원숭주시평원구농지토양력함량특정급래원진행분석，결과표명，연구구토양력함량재0.16~0.77 mg·kg-1지간，평균위0.33 mg·kg-1，고출국가토양배경질량이급표준10%，양점초표솔30.43%。연구구토양력총체상처우중등정도적잠재생태풍험，대인체적치암풍험상처우가접수적범위。성토모질、토속류형、수계、농지이용방식화주요교통도로대토양력함량변이적독립해석능력분별위20.71%、24.70%、25.68%、12.62%화10.58%，즉연구구토양력수자연지질과정화인위활동인소적종합영향，자연지질과정대토양력함량적주공작용총체상대우인위활동인소。수계화교통도로적영향범위분별주요재기4.0 km화1.5 km범위내。자연지질과정화인위활동인소대토양력함량적주공작용재거리수계4.0 km전후발생개변：거리수계4.0 km범위내，자연지질과정적주공작용명현대우인위활동인소；거리수계4.0 km지외，인위활동인소칙시최중요적공제인소。연구결과위심화대성도평원토양력오염궤제적인식화력오염방공제공료삼고。
Heavy metal pollution in farmland soils in the Chengdu plain is threatening the security of agricultural products. Here we exam-ined contents and sources of cadmium(Cd)in farmland soils in Chongzhou area of the Chengdu plain. Cadmium contents in the farmland soils ranged from 0.16 mg·kg-1 to 0.77 mg·kg-1, with an average of 0.33 mg·kg-1, which exceeded the GradeIIlimit of the National Soil Environmental Quality Standard(GB 15618-1995). There were 30.43%of soil samples in which Cd contents exceeded the standard. As-sessments of potential ecological and human health risks indicated that Cd in the soils had moderate potential ecological risk. The carcino-genic risks of Cd in these soils were within the acceptable range, which showed a range from 5.67E-07 to 2.77E-06 for adult and from 1.42E-06 to 6.93E-06 for children. Agricultural land uses, parent materials, soil types, rivers and highways respectively contributed to 12.62%, 20.71%, 24.70%, 25.68%and 10.58%of soil Cd variability. This implied that both natural geological and human activity factors determined the heterogeneity of soil Cd, with natural geological factors playing greater roles. Rivers and highways had impacts on soil Cd up to 4.0 km and 1.5 km, respectively. In soils more than 4 km away from rivers, agricultural land use became a dominant factor affecting soil Cd. These findings provide useful information about understanding of soil Cd pollution and sources in the farmland of the Chengdu plain.