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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (06): 1121-1126.doi: 10.3724/SP.J.1006.2012.01121

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Effects of Winter Ryegrass Planting on Soil Heavy Metal Content and Accumulation and Distribution in Different Organs of Late Rice in Six Paddy Soils

TANG Hai-Ming,TANG Wen-Guang,XIAO Xiao-Ping*,LUO Zun-Chang,ZHANG Fan,WANG Ke,YANG Guang-Li   

  1. Hunan Soil and Fertilizer Institute, Changsha 410125, China
  • Received:2011-09-19 Revised:2012-02-22 Online:2012-06-12 Published:2012-04-06
  • Contact: 肖小平, E-mail: hntfsxxping@163.com E-mail:tanghaiming66@163.com

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Abstract: Investigation of the effects of winter ryegrass planting on soil heavy metal content and its accumulation and distribution in different organs of late rice in double-rice cropping paddy field with different paddy soil types will play an important role on rice quality safety and environmental security assessment of paddy field. Based on seven years long-term located experiments in paddy fields, we analyzed the effects of winter ryegrass planting on soil heavy metal content and its accumulation and distribution in rice in double-rice cropping paddy field with different paddy soil types including granitic sandy soil (GSS), grey clayey soil (GCS), purple clayey soil (PCS), red yellow clayey soil (RCS), yellow clayey soil (YCS) and alluvial sandy soil (ASS). The results showed that the Cd content in GCS was significantly higher than that in other treatments, while the Pd content in YCS was significantly higher than that in other treatments. RCS had the highest Hg content with 0.029 mgkg-1, and the highest As contents with 29.5 mgkg-1 in YCS. The contents of Cd, Pb and As in late rice showed an order as root > stem and leaves > brown rice. Cd contents in root, stem and leaves, and brown rice planting in RCS were significantly higher than those in other treatments. And the highest Pb and As contents in root of rice planting in YCS was 33.0 and 119.5 mgkg-1, respectively. Meanwhile, the Hg and As contents in rice stem and leaveswere significantly higher in ASS than in other soil types. Our results clearly demonstrated that the heavy metal content of brown rice was decreased, and the quality of late rice was ultimately improved under YCS condition.

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