فنولوژي گونه هاي مرتعي بومي در مناطق استپي گرم خوزستان

Phenological study on native range plants on warm and semi warn steppe of Khuzestan province

This study conducted on phenology of some native rangeland plants at warm steppe and semi warm steppe in Douderoon and Allah-Akbar key areas in Khuzestan Iran. The study was assessed from 1996 to 1998. The purpose at this paper is to provide plant development intormation, starting date and dura1ion of grazing period were the main object of the study. The result of this research will be usetul in predicting were the main abject of the study. The result 01 this research will be useful in predicting tirre of range readiness, timing of forage growth and as an aid in designing. In this manner it the aim to be production increase, with using desirable species, differred grazing to be used until with seed veporing and dissemination of plant to be increase canopy cover and range production. Four species at grasses, four species at forbs and thirteen species of shrubs were selected. Ten relatively uniform stand of each species were signed to be measured. Data were collected and recorded in special notebook of torms every fifteen days. Climatic data were collected Irom Masjed solyman and Boostan synoptic station . Phenological tapes that show the stand and end of each phenological stage drawed on histograms. At least, suitable grazing and ~he best time tor seed collection was determined. The result of the study shows that the growth period of shrubs is longer than grasses and forbs.