期刊论文

Reduction of Soil Cadmium Activity and Rice Cadmium Content by 4-yearconsecutive Application of Organic Fertilizer

Sheng, Hao(shenghao82@hunau.edu.cn)

中文

环境科学

0250-3301

2020

41

4

1880-1887

10.13227/j.hjkx.201910025

湖南省农业委员会项目（农业部农办财函[2015]38号）； 国家自然科学基金项目（41571234）； 湖南农业大学“1515”学术创新团队项目；

本校为第一且通讯机构

商品有机肥由于可能含镉( Cd), 并在施入后对水稻土中Cd的有效性具有“抑制”和“激活”的双重作用,导致施有机肥的稻米降Cd效应目前仍存在较大不确定性.通过选取湘东地区典型水稻土(紫泥田土种), 连续4 a定位监测了大田施用商品有机肥对双季稻稻米的降Cd效应,探索稻米Cd含量与双季稻不同生育期土壤Cd有效性、土壤因子( pH、土壤活性有机碳组分与铁氧化物)的关系.结果表明,施有机肥降低双季稻糙米Cd含量28% ~ 56%,且晚稻糙米Cd含量降幅( 43% ~ 56%)高于早稻糙米Cd含量的降幅( 28%~ 45%), 降幅的年际波动小.一方面,施有机肥也导致双季稻某些生育期(分蘖盛期自齐穗期)土壤有效态Cd含量平均下降6%~...

Because commercial organic fertilizers may contain cadmium (Cd) and may cause the dual effect of ""inhibition"" and ""activation"" on Cd availability in paddy soil with organic fertilizer input, the reduction of rice Cd following organic fertilizer application is still uncertain. Herewith, typical purple mud paddy fields were selected in the eastern Hunan Province. The effect of commercial organic fertilizer input on Cd reduction of double-rice paddy ecosystem was monitored for four consecutive years. The relationships between brown rice Cd con...