Distribution Characteristics of Soil Cadmium in Different Textured Paddy Soil Profiles and Its Relevance with Cadmium Uptake by Crops

文献类型： 外文期刊

第一作者： Wang Zheng-yin

作者： Wang Zheng-yin;Qin Yu-sheng;Zhan Shao-jun;Yu Hua;Tu Shi-hua

作者机构：

关键词： Cadmium; Soil texture; Distribution in soil profile; Rice; Wheat; Chengdu plain

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2013 年 33 卷 2 期

页码：

收录情况： SCI

摘要： Adopting atomic absorption spectrometry (novAA400), the present study investigated the distribution characteristics of soil cadmium (Cd) in different textured paddy soil profiles under rice-wheat rotation and its correlation with Cd uptake by rice and wheat in Chengdu Plain through repeatedly taking soil and plant samples at the fixed sites in the field. The results revealed that Cd in the paddy soil profiles was mainly concentrated at the plough layer (0 similar to 15 cm) that obviously featured Cd accumulates towards the rooting layer'. Soil total Cd and available Cd (1 mol . L-1 MgCl2 extraction) in the profile declined with soil depths and its average values at 30 similar to 45 cm only accounted for 47. 60% and 39. 49% of those at 0 similar to 15 cm. The potential downward movement of Cd in the different textured soil profiles was observed as sandy loam>heavy loam>loam. There was no significant correlation between soil pH and available Cd(r=-0. 46) at 0 similar to 15 cm soil depth, while significantly negative correlations between soil pH and available Cd were observed at 15 similar to 30 cm (r=-0. 78) and 30 similar to 45 cm (r=-0. 86). The results further demonstrated that the Cd contents in either grain or straw of rice and wheat were not well correlated with soil total Cd at any soil depth (r=-0. 092 similar to 0. 383 for rice and r=0. 174 similar to 0. 424 for wheat), but significantly correlated with soil available Cd at 0 similar to 15 cm and at 15 similar to 30 cm (r=0. 766*similar to 0. 953**) despite insignificant correlation at 30 similar to 45 cm (r=0. 526 similar to 0. 584). It is strongly suggested that the soil available Cd can be used as a better criterion than the total soil Cd to rate Cd contaminated soils in relation to safety of agricultural products.

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