CAJ | 학술논문

为探讨非食源性作物陆地棉应用于土壤中镉原位净化的可行性,选取华北地区城郊污灌区6块代表性陆地棉样地,运用高分辨电感耦合等离子体质谱仪(HR-ICP-MS),测定了土壤及陆地棉根系、秸秆、果壳、纤维、籽粒中消解态全镉含量. 结果显示:污灌土壤中w(Cd)平均值为247.26 μg/kg,已出现积累现象;陆地棉植株各组织中w(Cd)为果壳(199.1 μg/kg)>秸秆(171.8 μg/kg)>根系(122.9 μg/kg)>籽粒(107.8 μg/kg)>纤维(44.8 μg/kg);陆地棉植株地上部分w(Cd)的加权平均值为150.2 μg/kg,其富集系数(BCF)为0.612,转移系数(TI)为1.22;按陆地棉生物量(干质量)为36 000 kg/hm~2计算,种植一季陆地棉可使土壤耕作层中w(Cd)降低2.02 μg/kg,降低了0.82%. 陆地棉属非食源性经济作物,其地域适应性广,对土壤镉的耐性较强,在污灌区土壤镉的原位净化中具有潜在应用前景.
위탐토비식원성작물륙지면응용우토양중력원위정화적가행성,선취화북지구성교오관구6괴대표성륙지면양지,운용고분변전감우합등리자체질보의(HR-ICP-MS),측정료토양급륙지면근계、갈간、과각、섬유、자립중소해태전력함량. 결과현시:오관토양중w(Cd)평균치위247.26 μg/kg,이출현적루현상;륙지면식주각조직중w(Cd)위과각(199.1 μg/kg)>갈간(171.8 μg/kg)>근계(122.9 μg/kg)>자립(107.8 μg/kg)>섬유(44.8 μg/kg);륙지면식주지상부분w(Cd)적가권평균치위150.2 μg/kg,기부집계수(BCF)위0.612,전이계수(TI)위1.22;안륙지면생물량(간질량)위36 000 kg/hm~2계산,충식일계륙지면가사토양경작층중w(Cd)강저2.02 μg/kg,강저료0.82%. 륙지면속비식원성경제작물,기지역괄응성엄,대토양력적내성교강,재오관구토양력적원위정화중구유잠재응용전경.
In order to fully understand the feasibility of non-food source plants (i.e. Gossypium hirsutum L.) to serve for in situ decontamination of cadmium in soil, the cadmium contents in the soils and the different organs of the plant (including cotton root, stem, boll, seed and fiber) collected from six typical Gossypium hirsutum L. sample plots in sewage-irrigated fields located in the suburbs in the North China were determined by high resolution Inductively Coupled Plasma Mass Spectrometry (HR-ICP-MS). The results indicated that the average concentration of Cd in the sewage-irrigated soil was 247.26 μg/kg, which was higher than the soil background value for Cd, revealing Cd accumulation in the soils of sewage-irrigated fields. Concentration or accumulation of Cd in various G. hirsutum L. organs followed the sequence: boll (199.1 μg/kg)> stem (171.8 μg/kg)> root (122.9 μg/kg)> seed (107.8 μg/kg)> fiber (44.8 μg/kg). The average accumulation concentration of Cd in the shoots was 150.2 μg/kg. The bioconcentration factor (BCF) and transportation index (TI) were 0.612 and 1.22, respectively. Accordingly, it can be inferred that Cd concentration of the soil may reduce 2.02 μg/kg (i.e. 0.82% of total Cd in the soil) for one crop of cotton, based on the assumption of 36,000 kg/hm~2 of dry-weight biomass production. Because G.hirsutum L. belongs to non-food source cash crops and has high tolerance, adaptability and strong absorption to Cd, in situ cadmium decontamination of sewage-irrigated soils using G.hirsutum L. shows a favorable application value and potential.