Effect of long-term fertilization on total arsenic of red soils
Total arsenic of two red soils under different fertilization treatments in two long-term experimental stations (Taoyuan and Qiyang, Hunan Province) was investigated. Results showed that soil arsenic concentrations of the horizon A (0-20cm in depth) were significantly (P<0.05) lower than those of the horizon B (20-40cm in depth) in the Taoyuan station. Arsenic in the horizon A of the treatments with manure applications (N+M, NP+M, NPK+M) (M represents manure) was lower than those of no manure treatments (N, NP, NPK) (N, P and K represent chemical nitrogen, phosphorus and potassium fertilizer, respectively). These results indicated that more arsenic would be removed with crops from horizon A than from horizon B in paddy fields and the application of manure in the red soil farmland could promote the removal of arsenic from the soils. Arsenic concentrations in the Qiyang soil (42.83±6.20~ 65.89±8.57mg·kg<1>) were much higher than those in the Taoyuan soil (10.27±0.71~ 16.75±2.06mg·kg<1>) in either horizon A or horizon B. This suggested a very limited risk of arsenic contamination caused by fertilizers in the red soils, while geological source played a dominant role in determining the soil arsenic concentrations.
red soil arsenic long-term fertilization risk assessment
Feng Li Yuanming Zheng Xiaoli Xie2 Jizheng He
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, P. R. China
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
844-845
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）