农业现代化研究2018，Vol.39Issue(1)：170-177,8.DOI:10.13872/j.1000-0275.2017.0123
南方稻田土壤有效态镉提取方法研究
Comparison of single extraction methods for assessing Cd availability in paddy soils in South China
摘要
Abstract
Soil available Cd plays a key role in soil Cd pollution risk assessment and Cd-contaminated soil remediation. However, there was limited research on the suitable single extraction method for evaluating the Cd bioavailability from paddy soils to rice in south China. Therefore, 90 groups of 'one-to-two' soil and rice (both early rice and late rice) samples were collected and 9 single extraction methods were assessed. The extraction methods were 0.1 mol/L CaCl2 (T1), 0.01 mol/L CaCl2 (T2), DTPA (T3), NH4OAc (T4), TCLP (T5), HCl (T6), Mehlich Ⅲ (T7), NaNO3 (T8) and Mehlich Ⅰ (T9). The extraction capacity and relationship between extractable Cd and Cd contents in rice were analyzed. The results indicated that the 4.7％ to 74.4％ of the total Cd in soils could be extracted by different extractants. The correlation relationships between extracted Cd in soils and Cd contents in rice were better than that between soil total Cd and rice Cd contents. Among the 9 tested extractants, T1 has an intermediate extraction capacity (41.9％). In T1 treatment, significant correlations were detected between extractable Cd in soils and Cd in early rice, late rice and both early rice and late rice with r of 0.618, 0.338 and 0.363, respectively (P<0.01). Moreover, significant correlations were discovered between extractable Cd of T1 treatment in soils and rice Cd contents of major rice varieties (r=0.376 to 0.793). In conclusion, the phytoavailability of Cd in paddy soils could be well described by extractable Cd from method T1 and it could be recommended as the extraction method of soil available Cd in south China.关键词
有效态镉/提取方法/稻米/成土母质/南方稻田土壤/季别/品种Key words
available cadmium/extraction methods/rice/soil parent materials/paddy soils in south China/rice seasons/rice varieties分类
农业科技引用本文复制引用
熊婕,朱奇宏,黄道友,朱捍华,许超,王帅,王辉..南方稻田土壤有效态镉提取方法研究[J].农业现代化研究,2018,39(1):170-177,8.基金项目
公益性行业(农业)科研专项(201403015) （农业）
国家自然科学基金项目(41371318). The Special Fund for Agro-Scientific Research in the Public Interest (201403015) （41371318）
National Natural Science Foundation of China (41371318). （41371318）
