干旱区生态环境知识资源中心

Due to failure to ecological identification and man's inappropriate and destructive interferences in natural environment lots of plant species have got extinct or are getting extinct. The goal of this research is to identify the ecological specifications of Ziziphus spina-christi for using in future planning. An ecological investigation on Ziziphus spina-christi L. was carried out by the authors through field visits and surveyed information in Bushehr Province. Through the topographic maps (E: 1.50000) Konar (Christ-thorn) sites were determined and specified and, they were investigated geologically, soil, climatically, and in terms of flora and Fauna, pests and diseases, the factors and parameters being effective in destruction of natural Christ-thorn stands, also in terms of the quantitative conditions of stands, and their natural regeneration. Natural stands of Christ-thorn exist on two forms (rare trees, scattered trees) in this province and two regions Rahdar and Chanir Plain in Bushghan were selected as the representation of scattered stands. The most important stands of Christ-thorn (Ziziphus spina-christi L.) are spread on alluvial fans with small stones, fine texture lands and sand dunes under which fine textured alluvial are placed. Their soils have loamy, sandy-loamy, silty-loamy and clay-silty texture. Their salinity is about 0.18-3.9 mil m/c. Their pH is about 7-8.20 and their saturate percent are about 23-60. According to Umbrgee method natural sites of Christ-thorn exist in low hot desert climate, high hot desert climate, mid hot desert climate, semi arid moderate climate, and arid moderate climate. Average number per hectare in Rahdar sites is 17.5-23 and average crown canopy is 2.13-2.28%.