Relationship Between Moringa peregrina, Salvadora oleiodes and Cappparis decidua Habitats and Soil Characteristics in Sistan & Balochestan Province by CCA Method

Moringa pregerina (Forssk.) Fiori.، Capparis decidua (Forssk.) Edgew. and Salvadora oleides Decne. are important indegenious shrub or tree species of Sahara-Sindian region which distributed and formed scattered woodlands in south east of Iran. The current research was carried out to find most effective soil characteristics intheir distribiution. For this purpose، a study was conducted in the Balochestan province of southeast Iran in 2008 for four years. Based on a vegetation map and field surveys، indicator sites were identified. Within each site، 1-3 profiles were dug. Soil sample was taken from 0-60 cm. Measured soil properties included: pH، EC، K، P، N، sand، silt، clay، T. N. V، gypsum، T. D. S. and texture. To determine the most soil effective factors on plants، multivariate techniques، including Canonical Correspondence Analysis (CCA) was applied. The results indicated that between three species habitates، only there are significant differences in nitrogen percent، gypsium and electrical conductivity. The CCA results indicated that the main edaphically factors affecting the distribution of Moringa pregerina are total neutralizing value (T. N. V) and clay percentage، and for Salvadora oleides، total neutralizing value (T. N. V)، total dissolved solid (T. D. S.) and sand percentage are effective factors and total neutralizing value (T. N. V) and total dissolved solid (T. D. S) characters play important roles in Capparis decidua presence