Comparing the Distribution of the Vegetative Cover in Two Different Ecosystems

Subject Areas : Semi Annual Journal of Weed Ecology

Hossein  Sadeghzadeh Yazdi ¹ (دانش‌آموخته کارشناسی ارشد شناسایی و مبارزه با علف‌های هرز دانشگاه آزاد اسلامی واحد مشهد)
Mohammad Hasan  Rashed Mohasel ² (استاد دانشکده کشاورزی دانشگاه آزاد اسلامی واحد مشهد)
Leila  Alimoradi ³ (استادیار دانشگاه آزاد اسلامی واحد مشهد)

Received: 2013-09-14 Accepted : 2014-06-17 Published : 2015-02-20

Keywords:

Abstract :

  This research was carried out to investigate the population structure of the plant flora of weeds in two different microclimates. To perform this experiment, two pieces of lands located in Mashhad, with dimensions of 95 × 20 m were selected; one of them was an abandoned agricultural land and the other was an abandoned garden. Both areas were without maintenance for about 8 years but the garden was irrigated just for grazing sheeps and goats. Sample taking from intersections of regular grids of 5 × 5 m by 1 × 1 m quadrates was conducted. After fitting the theoretical models of empirical variogram with interpolation of points, the maps of the species were drawn. To study the  vegetative cover in both regions the α and β diversity indicators, the relative frequency, species richness, uniformity, Shanon-Veiwer and Simpson indices, and also similarity indicators, Ashtyn house, Jaccard and Sorenson similarity coefficient was determined. Totally 35 species which were belonged to 12 plant families were found, 15 species of which were found in the abandoned agricultural land but Alhagi pseudalhaji and two species of Lactuca genus were common in both lands. In the survey conducted, 31 species were dicots and 4 species were monocots. Climate conditions causes that in each region ecotype of plant species vary in terms of the number and families, thus effects on the diversity and distribution in the region.

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