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Potential habitat modeling for reintroduction of three native plant species in central Iran

Journal of Arid Land 2015年第3期7卷 381-390页

作者： elham g ardestani Mostafa TARKESH Mehdi BASSIRI Mohammad R VAHABI Department of Natural Resources Isfahan University of Technology

Potential habitat modeling of endemic species is an appropriate method to maintain biodiversity,ecosystem function and rehabilitation of rangeland *** caragana,*** and *** are endemic in Iran＇s rangelands and some neighboring *** three native species could endure environmental stresses due to their distinctive ecophysiological *** play important roles in sustainable pastures production,recreation and *** suffer severe threat from many factors including;grazing,agriculture and invasive exotic *** analyzed the potential habitat of three native plant species in central Iran basing on the grid map with the resolution of *** used inventory records from field surveys,herbarium collections and 22 environmental factors to explore the environmental influences on given species distribution by Maximum entropy（Maxent） *** is a species distribution model that uses species occurrence and environmental data for predicting potential *** results of our study indicated species occurrence has strong correlation with environmental factors such as mean temperature of wettest season,elevation and precipitation of coldest *** evaluated the model accuracy by AUC（area under the receiver operating characteristic curve） based on an independent test data *** values indicated the high power of Maxent to create potential habitat map（***=0.988,***=0.927,***=0.923）.It is important to consider that AUC values tend to be lower for species that have broad distribution scope,such as *** *** suitable potential habitat distributions of the three species were predicted in the western and southwestern parts of rangelands in Isfahan *** comparisons of the actual distribution map of the three species with produced Maxent maps represent a good *** general,the model demonstrated that the occurrence of the given species

关键词： Astragalus caragana Astragalus cyclophyllon Astragalus podolobus environmental factors Maxent

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SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURED-SEgMENTED BLOCK COPOLYETHERAMIDE BASED ON NYLON6 AND POLY(ETHYLENE OXIDE)

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Chinese Journal of Polymer Science 2010年第4期28卷 597-605页

作者： Majid Peyravi Masoomeh Akhfash ardestani Ali Akbar Babaluo Mir Karim Razavi Aghjeh Seyed Roohollah Pishghadam elham Jannatdoust Nanostructure Materials Research Center(NMRC) Sahand University of TechnologyP.O.Box 51335/1996TabrizI.R.Iran Chemical Engineering Department Sahand University of TechnologyP.O.Box 51335/1996TabrizI.R.Iran Institute of Polymeric Materials Sahand University of TechnologyP.O.Box 51335/1996TabrizI.R.Iran Polymer Engineering Department Sahand University of TechnologyP.O.Box 51335/1996TabrizI.R.Iran

Segmented block copolymer based on nylon6 （N6） and polyethylene oxide （PEO） with stochiometric ratio was synthesized via a two-step process. The first step represents end capping of N6 in the presence of adipic acid leading to carboxy terminated N6, and the second one is polycondensation of the latter product with PEO in the presence of catalyst and thermostabilizer to form a high molecular weight multi-block copolymer. Several methods were applied to characterize the synthesized copolyrner such as Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, differential thermal analysis, differential scanning calorimetry, X-ray diffraction and atomic force microscopy. The obtained results confirmed the multi-block structure for copolymer with a very high degree of micro-phase separation. Atomic force microscopy micrographs indicated that the morphology was the dispersion of high stiffness nanostructured polyamide （PA） domains in the amorphous region of PEO matrix, which can be very important in their performance for membrane processes.

关键词： Copolyetheramide Segmented block Nylon6 Poly(ethylene oxide) Nanomaterial

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