Abstract
Persian walnut (Juglans regia L.) is thought to have originated in the mountainous regions of Central Asia, including the forests of northern Iran. Remaining wild stands of this genetic resource are located within diverse associated communities of plant species. To study the tree species associated with the natural walnut populations of the northern forests of Iran, four distinct geographical populations located at Astara (38°19' N and 48°44'), Roudsar (36°55.5' N and 50°16'), Takke Kamar (36°47.5' N and 55°5') and Ali Abad (36°50.7' N and 55°7') were studied. The populations found in the western region, the Hyrcanian forest, were larger than those farther east, but eastern populations were less disturbed and found in more purely wild stands. In the Astara region, the dominant plant community was Parrotia-Carpinetum and the dominant plant species were Alnus glutinosa (L.) Gaerth, Alnus subcordata C.A. Mey, Diospyrus lotus L. and Juglans regia L. The stand was even aged and the largest DBH (Diameter at Breast Height) was 91 cm. The tallest tree had a height of 26 m. In the Ali Abad region, the plant community was Querco-Carpinetum and the dominant plant species were Carpinus betulus L., Ulmus glabra Huds and Tilia platyphyllos Scop. subsp. Caucasica. The stand was even aged, the largest DBH was 131 cm, and the tallest tree was 42 m in height.
Published Version
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