Temporal and regional shifts of crop species diversity in rainfed and irrigated cropland in Iran.

Also, an investigation of the species richness index showed that 85.1% of sites had an increasing trend (significant at 59.7% of them), which indicates an increase in the number of crop species ( Fig 6A and 6B ).

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Also, to determine a significant trend in H’, E and S, non-parametric Mann–Kendall test were applied.

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The low percentage of sites with a positive trend indicates the declining situation of crop diversity in rainfed cropland.

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The Shannon index had a decreasing trend between 1999 and 2010.

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