بررسی ات اکولوژی ‭Puccinellia distans ‬در زیستگاه های شور و قلیایی شمال گرگان و دشت

Puccinellia distans is a perennial grass which grows in the north region of Gorgan with saline and alkaline soil, high water table and heavy texture and slow drainage of soil, it is an oblige halophytic plant which is well adapted to 300 mm rainfall and has well regeneration. In order to studding of autecology of Puccinellia distans (jacq.) Pal. Three habitats have been considered ( Seashore area, Gomishan and Sangartapeh). Factors as soil type, water table, vegetation, different stage of plant growth, chemical components, palatability, seed germination and also its distribution have been studied. Growing initiation is from the early autumn and seed ripening is occurred in the last spring, the spikelet may remain until end of autumn. Chemical components show that the percentage of protein during vegetative growth is 14-16 and in the stage of seed ripening is at least 3.6- 4.4%. Its palatability compared with to accompanying species has been analyzed with method of feeding minutes and free choice show higher and is at first class. It can be reproduced with seed and also root division and spread rapidly with seed, propagation is obviously occurred by protection of it s habitats. Seeds germinate in temperature between 20-25 oc up to 50%. Forage production in sea shore area, Gomishan and Sangartapeh are respectively 187, 691,800 kg/h and vegetation component percentage were 53.4, 48.8 and 40.3. Important value in sea shore area was 74.7, Gomishan 73 and Sangartapeh 43.8 according to 300 of base.