Walnut: a potential multipurpose nut crop for reclaiming deteriorated lands and environment
Because of urban development and changing land-usage, most lands have been deteriorated by human. In addition, natural disasters have exacerbated this problem. Trees with their strong root system have a key role in maintaining lands against destructive factors such as erosion and human activity. Walnut is one of the trees playing a main role in reclaiming lands. Iran is considered a biodiversity-hotspot for walnut in the world. There is a large natural and cultivated population of walnut in Iran. Native walnut trees are found in deep valleys in the Kopet Dagh Mountains, the quite dry region in the northern slopes. Natural walnut trees in the northern and western forests of the country not only protect land, but also have a special role in the economy of local people. Because of wide and deep root system, walnut stabilizes and protects the soil from erosion. Furthermore, walnut is a multi-purpose tree that can be used for wood production in forests and as an ornamental plant in landscape design. Generally, existence of very old walnut trees with a minimum attention and conservation reveals that this tree can be cultivated in deteriorated lands not only to prevent soil erosion but also as a productive and lucrative product. Even if walnut trees yield in deteriorated lands is just 1 t ha-1, its revenues will be five times higher than many annual crops.
Vahdati, K., Sarikhani Khorami, S. and Arab, M.M. (2018). Walnut: a potential multipurpose nut crop for reclaiming deteriorated lands and environment. Acta Hortic. 1190, 95-100
biodiversity, Iran, northern forest, soil erosion, walnut population