Water Management in Agriculture

Water Management in Agriculture

Trends of Soil Salinity Changes and Its Relation to Climate Variables

Document Type : Original Article

Authors
Masoud Pourgholam Amiji 1
Mohammad Ansari Ghojghar 2
Mojtaba Khosh Ravesh 3
Abdolmajid Liaghat 4
1 Ph.D Candidate, Department of Irrigation and Reclamation Engineering, Faculty of Agriculture Engineering & Technology, College of Agriculture and Natural Resources, University of Tehran
2 Department of Irrigation and Reclamation Engineering, Faculty of Agriculture Engineering & Technology, Campus of Agriculture and Natural Resources, University of Tehran.
3 Assistant professor, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
4 Department of Irrigation and Reclamation Engineering, Faculty of Agriculture Engineering & Technology, Campus of Agriculture and Natural Resources, University of Tehran.
Abstract
This research was used from climate information such as average humidity, average wind speed, soil temperature and salinity of different soil depths (5, 10, 20, 30, 50, and 100 centimeters) in 10 years (2008-2017). The purpose of this study was to investigate the relationship between climate parameters and soil salinity fluctuations. Also, Hurst test to find enough variance of the data to analyze the time series trend, and Mann-Kendal, spearman, and multivariate regression tests were applied for data analysis. The results showed that all parameters of the study based on the Hurst coefficient bigger than 0.5, had a significant variance for time series analysis. The results of Mann-Kendal and spearman tests showed that in surface soil layers (5 and 10 cm) after 10 years period, the soil salinity had a descending trend. However, both tests had an increasing trend in deeper layers (20, 30, 50 and 100 cm) and at depths of 50 and 100 cm observed the significantly increasing trend at a 5% level. As far as the root centralization is mostly in depth of 30 cm, the multivariate regression test illustrated that the temperature in depth of 5 cm and average relative humidity (each 16%) and average speed of 60% had the most and the least effect, respectively on the soil salinity in the mentioned soil depth. Also, in four depths of six depths, the temperature in depth of 5 cm was the most effect on soil salinity of different soil depths.
Keywords
Climate Parameters
Man-Kendal and Spearman
Multivariate Regression
Salinity Variations
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