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Impact of long-term wastewater irrigation on variability of soil attributes along a landscape in semi-arid region of Iran

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Abstract

Twelve soil profiles and 62 soil cores were described from two neighboring landscapes in the northwest of Iran to understand whether long-term wastewater irrigation has caused variations in morphological, physicochemical, and DTPA-heavy metals contents in soils. Along a gradual slope, different positions reflected heterogeneous response to flooding wastewater irrigation. Upper slope and mainly midslope were subject to gradual soil loss as characterized by thin Ap-horizons and shallow soil depth, whereas periodic cycles of soil accumulation and sediment along with local reducing condition were highlighted in lower slope. Compared to different positions of control land, wastewater irrigation increased significantly (P  0.05) soil fertility attributes (N, P, K, and organic matter) along with electrical conductivity. Significant correlations were observed between soil fine particles fraction and available P and also with available K, indicating that spatial distribution pattern of these elements is mainly dependent on distribution of the <0.002 mm fractions along the landscape as it is affected by wastewater irrigation. Midslope position was found to be more degraded compared to the other position regarding soil loss and available nutrients (N, P, and K) as a result of the processes of soil redistribution and soil transport in wastewater irrigation system. Mean concentrations of DTPA-extractable Zn, Cu, Cd, and Pb in the different geomorphological positions were 3.8–7.8, 2.5–3, 3–4, and 1.7–3.5 times greater, respectively, when compared to the adjacent control soil. With the exception of lower slope position, which indicated a remarkable increasing pattern of smectite in response to wastewater irrigation and unfavorable drainage condition, the relative abundances of clay minerals in view of the peak position and intensity followed almost the same pattern in both wastewater-irrigated and control landscape.

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Acknowledgments

The Urmia University supported this research. The authors would like to thank the staff of Vice Chancellor Research Office for their cooperation and assistance.

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Correspondence to S. Rezapour.

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Rezapour, S., Samadi, A. & Khodaverdiloo, H. Impact of long-term wastewater irrigation on variability of soil attributes along a landscape in semi-arid region of Iran. Environ Earth Sci 67, 1713–1723 (2012). https://doi.org/10.1007/s12665-012-1615-1

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