Influence of the sewage irrigation on the agricultural soil properties in Tongliao City, China

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• 作者：Hong Yao (1497)
  Shichao Zhang (1497)
  Xiaobo Xue (1497)
  Jie Yang (1497)
  Kelin Hu (2497)
  Xiaohua Yu (1497)
  
• 关键词：spatial variability ; soil properties ; groundwater and sewage irrigation
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：7
• 期：2
• 页码：273-280
• 全文大小：359KB
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• 作者单位：Hong Yao (1497)
  Shichao Zhang (1497)
  Xiaobo Xue (1497)
  Jie Yang (1497)
  Kelin Hu (2497)
  Xiaohua Yu (1497)
  
  1497. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing, 100044, China
  2497. Department of Soil and Water Sciences, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100094, China
  
• ISSN：2095-221X

文摘

Increasing shortages of fresh water has led to greater use of treated wastewater for irrigation of crops. This study evaluates the spatial variability of soil properties after irrigation with wastewater and freshwater. Geostatistical techniques were used to identify the variability of soil properties at the different sites. A set of physical and chemical soil properties were measured including total nitrogen (TN), total phosphorus (TP), organic matter (OM) and soil moisture. The TN concentration levels varied from 567 to 700 mg·kg?, while OC levels ranged from 7.3 to 16.3 mg·kg? in wastewater-irrigated zones. The concentration levels of TP were between 371.53 and 402.88 mg·kg? for the wastewater-irrigated sites. Wastewater irrigation resulted in higher TN, TP and OM concentrations by 18.4%, 8% and 25%, respectively. The highest TN and OM occurred along the wastewater trunk. It was also observed that nitrogen concentrations correlate with the soil’s organic matter. The increase of salinity may be associated with the increase of pH, which might suggest that a reduction of pH will be beneficial for plant growth due to the decrease of salinity. The average concentrations of nitrogen in topsoil were higher than those in subsurface soils in irrigated areas. Such differences of the N profile might be due to variations in organic matter content and microbial populations. Consistent with TN and OM, soil C:N decreased significantly with an increase of depth. This phenomenon possibly reflects a greater degree of breakdown and the older age of humus stored in the deeper soil layers. The analysis of pH levels at different depths for the three sites showed that pH values for wastewater irrigation were slightly lower than the controlled sites at the same depths.