...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Baseline Soil Variation Is A Major Factor In Arsenic Accumulation In Bengal Delta Paddy Rice
【24h】

Baseline Soil Variation Is A Major Factor In Arsenic Accumulation In Bengal Delta Paddy Rice

机译：基线土壤变化是孟加拉三角洲水稻稻米砷积累的主要因素

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Factors responsible for paddy soil arsenic accumulation in the tubewell irrigated systems of the Bengal Delta were investigated. Baseline (i.e., nonirrigated) and paddy soils were collected from 30 field systems across Bangladesh. For each field, soil sampled at dry season (Boro) harvest, i.e., the crop cycle irrigated with tubewell water, was collected along a 90 m transect away from the tubewell irrigation source. Baseline soil arsenic levels ranged from 0.8 to 21. mg/kg, with lower values found on the Pliestocene Terrace around Gazipur (average, 1.6 ± 0.2 mg/kg), and higher levels found in Holecene sediment tracts of Jessore and Faridpur (average, 6.6 ± 1.0 mg/kg). Two independent approaches were used to assess the extent of arsenic build-up in irrigated paddy soils. First, arsenic build-up in paddy soil at the end of dry season production (irrigated - baseline soil arsenic) was regressed against number of years irrigated and tubewell arsenic concentration. Years of irrigation was not significant (P = 0.711), indicating no year-on-year arsenic build-up, whereas tubewell As concentration was significant (P=0.008). The second approach was analysis of irrigated soils for 20 fields over 2 successive years. For nine of the fields there was a significant (P < 0.05) decrease in soil arsenic from year 1 to 2, one field had a significant increase, whereas there was no change for the remaining 10. Over the dry season irrigation cycle, soil arsenic built-up in soils at a rate dependent on irrigation tubewell water, 35~* (tubewell water concentration in mg/kg, = mg/L). Grain arsenic rises steeply at low soil/shoot arsenic levels, plateauing out at concentratations. Baseline soil arsenic at Faridpur sites corresponded to grain arsenic levels at the start of this saturation phase. Therefore, variation in baselinernlevels of soil arsenic leads to a large range in grain arsenic. Where sites have high baseline soil arsenic, further additional arsenic from irrigation water only leads to a gradual increase in grain arsenic concentration.
机译：调查了孟加拉三角洲管井灌溉系统中稻田土壤砷积累的影响因素。从孟加拉国的30个田间系统中收集了基准土壤（即非灌溉土壤）和稻田土壤。对于每个田地，在远离管井灌溉源的90 m断面处收集旱季（Boro）收获时采样的土壤，即用管井水灌溉的作物周期。基线土壤砷含量范围为0.8至21 mg / kg，在加兹普尔附近的斜新世阶地发现较低的值（平均值为1.6±0.2 mg / kg），而在杰索尔和法里德布尔的霍勒烯沉积道中发现的较高值（平均值， 6.6±1.0mg / kg）。两种独立的方法用于评估灌溉稻田土壤中砷的积累程度。首先，将旱季生产结束时稻田土壤中的砷积累量（灌溉-基线土壤砷）与灌溉年限和管井砷浓度进行回归。灌溉年数不显着（P = 0.711），表明无逐年砷积累，而管井砷浓度显着（P = 0.008）。第二种方法是连续两年分析20个田地的灌溉土壤。从第1年到第2年，有9个田地的土壤砷显着减少（P <0.05），而一个田地有显着增加，而其余10个田地则没有变化。在旱季灌溉周期中，土壤砷在土壤中的积累量取决于灌溉管井水的浓度35〜*（管井水浓度，以mg / kg表示，mg / L）。在低土壤/下砷水平下，谷物中的砷急剧上升，在集中时达到稳定水平。在此饱和阶段开始时，Faridpur地点的基线土壤砷与谷物砷水平相对应。因此，土壤砷基线水平的变化导致谷物中砷的变化幅度很大。在土壤基准砷含量较高的地点，灌溉水中的其他砷只会导致谷物中砷的浓度逐渐增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号