CAJ | 학술논문

　　土壤中镉元素稳定的残渣态所占比例在重金属中为最低，其赋存形态以离子态为主，易被植物吸收的活性态较高，生态危害较大。稻米镉元素与土壤镉元素具有显著的正相关性。根据区域土壤镉元素与稻米镉元素含量及稻米镉超标率关系，将水稻种植土壤分为生态安全土壤、具生态安全风险土壤及生态安全高风险土壤，提出了土壤镉元素生态安全定量分级标准。
　　토양중력원소은정적잔사태소점비례재중금속중위최저，기부존형태이리자태위주，역피식물흡수적활성태교고，생태위해교대。도미력원소여토양력원소구유현저적정상관성。근거구역토양력원소여도미력원소함량급도미력초표솔관계，장수도충식토양분위생태안전토양、구생태안전풍험토양급생태안전고풍험토양，제출료토양력원소생태안전정량분급표준。
Among heavy metals, cadmium in stable residue state has the smallest share in soil. Occurring substantially in the form of ion, it is easily absorbed by plants for its higher activated state, thus doing much damage to ecology. There exists a remarkable positive correlation between cadmium in paddy rice and cadmium in soil. Based on the relationship between cadmium in soil, cadmium in rice and its rate of over-standard content in rice, the author divided paddy rice growing soil into ecologically safe soil, ecologically risky soil and ecologically highly risky soil, and gave a ecological safety quantitative rating standard for cadmium in soil.