CAJ | 학술논문

对苏锡常地区416套稻米-耕层土样品Cd等元素含量的解剖研究，证实了土壤Cd、Zn、Se、pH、OM、CEC等是控制稻米Cd的重要地球化学因素。相关统计分析结果显示：1）酸性土壤环境中当稻米Cd的BCF值大于10%时，稻米Cd与土壤Cd、Zn呈显著正相关，相关系数大于0.67。土壤Cd的生物有效量普遍较高，土壤中酸可溶态Cd与稻米Cd含量的相关系数大于0.7，接近或稍高于稻米与土壤Cd的相关性；2)土壤Se、OM、CEC均能抑制水稻对土壤Cd的吸收，在一定条件下稻米Cd与土壤Se、OM、CEC之间显著负相关，相关系数均小于-0.5；3）土壤酸化可促进稻米对土壤Cd的吸收，当土壤Cd＞0.2 mg/kg、OM变化于2.5%~6.5%时，稻米Cd与土壤pH呈显著负相关，相关系数为-0.6；4）水稻不同器官中Cd含量不同，从根部→地上部→稻米Cd含量渐次降低，指示根部水稻器官在稻米从土壤吸收Cd的过程中发挥了更大作用、水稻根系吸收的Cd多积聚于根部。
대소석상지구416투도미-경층토양품Cd등원소함량적해부연구，증실료토양Cd、Zn、Se、pH、OM、CEC등시공제도미Cd적중요지구화학인소。상관통계분석결과현시：1）산성토양배경중당도미Cd적BCF치대우10%시，도미Cd여토양Cd、Zn정현저정상관，상관계수대우0.67。토양Cd적생물유효량보편교고，토양중산가용태Cd여도미Cd함량적상관계수대우0.7，접근혹초고우도미여토양Cd적상관성；2)토양Se、OM、CEC균능억제수도대토양Cd적흡수，재일정조건하도미Cd여토양Se、OM、CEC지간현저부상관，상관계수균소우-0.5；3）토양산화가촉진도미대토양Cd적흡수，당토양Cd＞0.2 mg/kg、OM변화우2.5%~6.5%시，도미Cd여토양pH정현저부상관，상관계수위-0.6；4）수도불동기관중Cd함량불동，종근부→지상부→도미Cd함량점차강저，지시근부수도기관재도미종토양흡수Cd적과정중발휘료경대작용、수도근계흡수적Cd다적취우근부。
On the basis of collecting and testing about 416 couples of rice seeds and the cultivated soil samples from Suxichang typical area of Jiangsu Province, a series of geochemical data related to Cd distribution and other relative elements concentrations <br> since 2011 was obtained. By studying and analyzing these data, the authors confirmed that rice uptake of Cd from soil is mainly controlled by such geochemical factors as cadmium, zinc, selenium, pH, organic matter (OM) and cation exchange capacity (CEC) within the cultivated soil. Some conclusions have been reached:1) When the pH is lower than 7.0 in soil and BCF (Bioconcentration Factor) is larger than 10%in milled rice, there exists obvious positive correlative relationship between Cd concentration of milled rice and Cd and Zn content within soil, and their correlation coefficients are above 0.67;bioactivity of cadmium in farmland soils is higher in most cases;there exists more significant correlative relationship between Cd of rice and bioavailable Cd of soil than total Cd within soil if cadmium content from the cultivated soil reflects only exchangeable and weak acid-soluble fraction, with the correlation coefficient larger than 0.7; 2) Se, OM and CEC could inhibit the rice uptake of Cd from the cultivated soil, and there exists a significant negative correlation between Cd concentration of milled rice and Se, OM and CEC concentrations within the soil under some limited conditions, with the correlation coefficients being less than-0.5; 3) Soil acidification could stimulate the increase of Cd content in the milled rice, when Cd concentration of milled rice is larger than 0.2mg/kg and its OM is equal to 2.5%~6.5%, and there yet exists significant negative correlation between Cd concentration of milled rice and pH in the cultivated soil, with the correlation coefficient smaller than-0.6;4) the Cd distribution in different rice organs is not uniform, from the roots to the upper rice organs, the Cd content in rice gradually reduced, and it is obvious that root rice organs could play a greater role in absorption of Cd from the cultivated soil during the rice growth.