11552

10605

كارشناسي ارشد

مرتع داري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1395

چهارده، 87ص.: مصور

محمدرضا وهابي، حميدرضا عشقي زاده

مصطفي تركش اصفهاني

حسين بشري، مرتضي زاهدي

1395/07/19

مهندسي منابع طبيعي

ID10605

Effect of environmental conditions moisture temperature and concentration of CO2 on some physiological characteristics of two species of range plant Agropyron trichophorum Link Richt and Bromus tomentellus Boiss Ali Babaei Mofateh ali babaei@na iut ac ir June 22 2016 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian Dr Mohammad Reza Vahabi vahabi@cc iut ac ir Dr Hamid Reza Eshghizadeh hr eshghizadeh@cc iut ac ir Abstract In this study the effects of climate change including three variables i e temperature carbon dioxide concentration and pattern of soil moisture on physiological characteristics of the two important forage plants species in pastures of West Isfahan province namely Bromus tomentellus pasture and Agropyron trichophorum were studied The results showed that increasing carbon dioxide concentration from 380 to 700 mol mol 1 caused an increase of 36 5 27 1 54 9 14 23 8 28 22 01 14 and 23 4 percent in greenness index SPAD chlorophyll a chlorophyll b leaf area leaf soluble protein the concentration of soluble sugars The concentration of soluble sugars underground parts aerial percent of the total dry weight shoot dry weight respectively However stomatal conductance and rhizomes percent of the total dry weight decreased by 33 1 and 8 percent respectively Increasing temperature reduced stomatal conductance chlorophyll a chlorophyll b leaf area shoot percent of the total dry weight shoot dry weight by 13 5 44 7 44 2 14 9 15 8 and 23 5 respectively However the concentration of soluble protein underground soluble sugar concentration and parts of the rhizome of total dry weight increased by 36 2 12 4 and 20 7 respectively The effect of soil water deficit reduced stomatal conductance greenness index SPAD value chlorophyll a chlorophyll b carotenoid concentration leaf area shoot percent of the total dry weight shoot dry weight by 41 32 9 56 7 54 8 47 35 6 22 1 and 36 9 respectively However The concentration of soluble sugars soluble sugars concentration of underground organs the root proportion of total dry weight rhizomes proportion of total dry weight and underground dry weight increased by 6 16 11 4 14 8 9 71 and 35 2 respectively Regardless of the pattern of humidity and temperature increase of carbon dioxide concentration of species Agropyron trichophorum and Bromus tomentellus increased average shoot dry weight respectively by 14 5 and 38 1 percent Therefore if all three of analyzed climatic parameters change with the conditions predicted in the A2 scenario for the year 2080 Bromus tomentellus species will have higher positive reaction to the increase of CO2 in terms of rising temperature and decrease in humidity levels However by changing all three elements of carbon dioxide temperature and humidity Agropyron trichophorum species will be a higher performance than any Bromus tomentellus Keywords Environmental factors climate change Agropyron trichophorum Bromus tomentellus rangeland ecosystems Isfahan

محمدرضا وهابي، حميدرضا عشقي زاده

مصطفي تركش اصفهاني

حسين بشري، مرتضي زاهدي