CAJ | 학술논문

以典型污灌区农田土壤为研究对象，分析污灌对农田土壤重金属Cd赋存形态的影响，并揭示其生物有效性空间分布特征。研究结果表明：经长期污灌，研究区土壤Cd主要以可交换离子态和碳酸盐结合态为主，两者占全量比平均为73％；各形态平均含量随污灌时间增长而增加，且其形态分配趋于向活性更强的可交换态、碳酸盐结合态转化；由于污灌历史不同，可交换离子态、碳酸盐结合态及铁锰氧化物结合态呈极显著差异。土壤生物有效态Cd和潜在有效态Cd与不可利用态Cd相比，所受外界影响因素多，具有更弱的空间结构性，其空间分布呈东高西低趋势，因而在未来农业结构调整及制定修复方案时，应予高度重视。
이전형오관구농전토양위연구대상，분석오관대농전토양중금속Cd부존형태적영향，병게시기생물유효성공간분포특정。연구결과표명：경장기오관，연구구토양Cd주요이가교환리자태화탄산염결합태위주，량자점전량비평균위73％；각형태평균함량수오관시간증장이증가，차기형태분배추우향활성경강적가교환태、탄산염결합태전화；유우오관역사불동，가교환리자태、탄산염결합태급철맹양화물결합태정겁현저차이。토양생물유효태Cd화잠재유효태Cd여불가이용태Cd상비，소수외계영향인소다，구유경약적공간결구성，기공간분포정동고서저추세，인이재미래농업결구조정급제정수복방안시，응여고도중시。
Long-term sewage irrigation would influence fractions and bioavailability of heavy metals in soils. Here Cd fractions and bioavail-ability spatial distribution were studied in farmland in Fenghui irrigated area of Xi′an City under long term sewage irrigation. Soil Cd existed mainly in exchangeable and carbonate fractions, accounting for 73%of total content. With increasing sewage irrigation time, soil Cd tended to transform to exchangeable and carbonate fractions. Irrigation history significantly affected exchangeable, carbonate and Fe-Mn oxides fractions. Soil bioavailable Cd and potentially available Cd contents had weaker spatial structure than unavailable Cd, implying that bioavailable Cd was more influenced by external factors. Soil Cd bioavailability reduced from the east to the west of the irrigated area. These findings would be very useful for adjusting agricultural structures and planning environmental remediation in the future.