| 摘要: |
| [目的]探明陕西优势苹果产区果园土壤的砷含量、污染情况和分布特征.[方法]2003～2007年,在陕西27个苹果基地县共选择495个代表苹果园,在每一果园采用“S”形法选取20个样点,采集0～40 cm土层土样,分析土壤中的砷含量.[结果]陕西渭北苹果园的土壤均为碱性,pH值为7.6～9.7;土壤中的砷含量和pH值频数分布为对数正态分布,几何平均值分别为11.80 mg/kg和8.30;按中国绿色食品产地土壤技术条件进行评价,土壤中的砷污染指数为0.605,污染指数大于0.5的果园达到88.6%;土壤中砷的垂直集中区域为0～40 cm土层,含量为3.7～19.9 mg/kg;土壤砷含量与pH值的相关系数为0.316 0,达到极显著差异水平(α=1%);在pH值为7.6～9.7时,土壤pH值越高越有利于砷的累积.[结论]以绿色食品产地环境土壤条件进行评价,陕西渭北苹果园土壤中的砷对苹果生产存在着潜在威胁. |
| 关键词: 苹果园 土壤砷 分布特征 陕西渭北 |
| DOI： |
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| 基金项目:〗国家“十一五”科技支撑计划项目（2007BAD79B01；2006BAK02A24）；陕西省重大科技创新计划项目（2006ZKC(一)05-01） |
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| Study on the distribution and contents of arsenic in apple orchard soils of Weibei, Shaanxi |
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| Abstract: |
| 【Objective】 The study investigated the contents,pollution,distributions of arsenic in apple orchard soils of Weibei,Shaanxi Province.【Method】 The 495 apple orchards were chosen from all 27 apple bases of Shaanxi Province from 2003 to 2007.The 20 sites were selected using“S” method in each orchard,and the soil specimens of 0 cm to 40 cm depth were collected for the content analysis of arsenic.【Result】 The apple orchard soils of Weibei,Shaanxi were alkaline,and pH values ranged from 7.6 to 9.7.The frequency distributions of arsenic contents and pH values in soil were logarithm normal schools,and geometric means were 11.80 mg/kg and 8.30 respectively.The average soil polluting index was 0.605,and the percentage of orchards with pollution indexes above 0.5 was 88.6%.Arsenic was mainly restricted to the upper 40 cm of soils with contents from 3.7 to 19.9 mg/kg.The correlation coefficient of the arsenic contents with the pH values of soils was 0.316 0,and was significant at 1% level according to SAS correlation analysis.【Conclusion】 Arsenic contents in the apple orchard oils were latent threat to apple production according to the state environmental soil condition of green food. |
| Key words: apple orchard arsenic of soil distribution characteristic Weibei,Shaanxi |
