Effects of Reclaimed Water Irrigation upon Soil Quality

Abstract:

To analyze reclaimed water irrigation effects upon soil quality, including indicators of secondary salinization and heavy metal accumulation, a field experiment in the typical reclaimed water irrigated area (Xin-he irrigated area, Tongzhou District) was carried out in this study. The treated soils for sampling and analyzing were irrigated with reclaimed water and well water. Soil heavy metal contents were determined by ICP-AES, while those of soil salt ions were determined by DX 600. Results show that, reclaimed water irrigated soil has a significant increase in salt ion contents than well irrigated soil, with an increasing order of Na⁺ >K⁺ >Mg ²⁺ >Ca ²⁺ . And Ca ²⁺ 、Mg ²⁺ 、Na⁺ accumulations at 40~80 cm and140~180 cm are relatively critical. Vertical trends of sodium adsorption ratio(SAR) values of soil extraction are the same in districts irrigated with reclaimed water and well water, however, SAR values of reclaimed water irrigated soil are significantly higher than well irrigated soil, with an average of 5~6 times bigger. But values are still in the suitable level for crops. Although heavy metals(Cu、As、Ni、Pb and Zn) slightly accumulate at 140~200cm, values are still consistent with soil environmental standard grade of 1or 2. And contents of heavy metals have no obvious differences between soils irrigated with reclaimed water and well water at 0~140cm.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 3022-3026
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.3022
• Online since: December 2012
• Authors: Jun Gao, Hui Xiao Wang, Hai Jun Liu, Jian Yin, Xuan Zhao
• Keywords: Heavy Metal Accumulation, Irrigation, Reclaimed Water, Secondary Salinization

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