فهرست مطالب محمدحسین ملاخلیلی

To investigate some effective causes of beetle attack to Amygdalus scoparia in Bagh Shadi Harat, Yazd 80 sampling plots were randomly selected. In each plot number of infected tree, percent of dryness for each tree, height, diameter at root collar and crown diameter of each tree, elevation, slope and aspect of each plot were measured or recorded. Results showed that beetle infection were positively correlated to dryness of Amygdalus scoparia, Loranthus Grewinkii and negatively to tree sprouting. Beetle infection were also positively correlated to density of Amygdalus scoparia, density and coverage of accompany species, number of dried Amygdalus scoparia and negatively to percentage of slop. It is concluded that beetles prefer habitat with denser and more coverage population of Amygdalus scoparia in flat area and on trees with less sprouting. Since the study area is an important conserved place in Yazd province, research to control the pest can be very important. Elimination of effected and old trees may limit growth of pests in this area.

Through a floristic study and plant sample collection during two growing seasons in 2008 and 2009, a total of 157 plant species was detected in BagheShadi protected area. These species belong to 44 families and 112 genera of plants. Most of the species belong to the family of Asteraceae with 27 (17%), Poaceae with 16 (10%), Faboideae with 15 (9%), and Rosaceae with 12 (7 %) species of the total. The classification of plans with respect to the life form was carried out according toRaunkiersystem. The Hamaephyte form is the most common and consists of 41 species (41% of total species) and closely next to that are Phanerophytes and Hemicryptophytes forms respectively with40 and 29 species. After these are Therophytesand Geophyteswith 27 and 10 species, respectively. The classification of plants based on the growth form shows that most of the plants in this area, which is about 40% of the total area, are herbaceous. Next to that are the bush, shrub, grass, tree, and the climbing forms with 27%, 17%, 9%, 6%, and 1%, respectively. The last experiment related to the analysis of the plants with respect to the durability of their life which indicated that the species with a few years of lifespan are the most frequent, comprising 53% of all species. Next to them are the perennial, annual, and two-year-old species, respectively with 26%, 16%, and 5%.

This study was conducted initially to investigate the relationship between water resources with dryness and pests effects on Amygdalus scoparia trees in Baghe-Shadi protected area. To this purpose, 17 sampling plots far away from water resources and 17 sampling plots close to these resources throughout the study area were randomly taken. In each plot, the numbers of trees with dryness rate above 25% and also trees affected by pests were recorded. Because of non-normality of data, to comparison far and close areas to water sources, Mann-Whitney test was used. Also, Kriging method was used to draw distribution map of dryness and pests in the study area. Results showed that there was a significant difference between two areas according to dryness, while difference of two areas was not significant for pest affection. The results taken by Kriging showed that the most aggregation of pests in the study area was around the villages and grazing areas.