In recent year,desertification has become one of the most important environmental hazards all over the world,especially in developing countries such as Iran.Understanding the factors impacting on desertification and i...In recent year,desertification has become one of the most important environmental hazards all over the world,especially in developing countries such as Iran.Understanding the factors impacting on desertification and identifying the regions with high desertification potential are essential to control this phenomenon(i.e.,desertification).The life cycle assessment(LCA)method is essential in assessing the desertification of ecosystems,especially for susceptible ecosystems with high degradation risks.The aim of the present study was to evaluate the desertification potential of Lorestan Province,Iran,based on the LCA method.We selected aridity,fire and dust as three indicators of desertification and collected data from 2000 to 2015.We divided the study area into 6 types of ecoregions according to the climate types(arid,semi-arid and dry sub-humid)and dominant species(Quercus brantii and Astragalus adscendens),and calculated the characteristic factor(CF)of each indicator(aridity,fire and dust)by combining the indicator layers and ecoregion layer of the study area.In a given ecoregion,the sum of CF values of aridity,dust and fire indicators represents the life cycle inventory(LCI)desertification value(the higher the LCI value,the greater the desertification potential).Then,we obtained the desertification potential map by combining and overlapping the ecoregions and the normalized indicators based on the LCA method.Aridity and fire exhibit significant impacts on desertification in the study area compared with dust.In the study area,semi-arid ecoregion with Quercus brantii as the dominant species is the largest ecoregion,while arid ecoregion with Quercus brantii as the dominant species is the smallest ecoregion.Arid ecoregion with Astragalus adscendens as the dominant species(LCI desertification value of 1.99)and dry sub-humid ecoregion with Quercus brantii as the dominant species(LCI desertification value of 0.79)show the highest and lowest desertification potentials,respectively.Furthermore,arid ecoregion with Quercus brantii as the dominant species also has a higher LCI desertification value(1.89),showing a high desertification potential.These results suggest the necessity of proper management and appropriate utilization in these ecoregions.In general,assessing desertification potential using the LCA method on a local and regional scale can possibly provide a new methodology for identifying and protecting areas with high degradation risks.展开更多
采用SEM、EDS、IR、TGA/DSC、固含量及pH分析方法对木素进行理化性能分析。将工作电极及对电极置于分别溶解不同木素的1.285 g/cm^(3)稀硫酸溶液中成三电极体系,对其进行循环伏安(CV)、线性扫描(LSV)及电化学阻抗(EIS)分析。装配2 V 10...采用SEM、EDS、IR、TGA/DSC、固含量及pH分析方法对木素进行理化性能分析。将工作电极及对电极置于分别溶解不同木素的1.285 g/cm^(3)稀硫酸溶液中成三电极体系,对其进行循环伏安(CV)、线性扫描(LSV)及电化学阻抗(EIS)分析。装配2 V 10 Ah样品电池进行连续17.5%DoD循环寿命性能测试,验证出有利于铅酸蓄电池循环寿命的木素。通过对木素的理化性能和电化学性能进行综合分析,得出了更适合的木素性能的表征方法。展开更多
文摘In recent year,desertification has become one of the most important environmental hazards all over the world,especially in developing countries such as Iran.Understanding the factors impacting on desertification and identifying the regions with high desertification potential are essential to control this phenomenon(i.e.,desertification).The life cycle assessment(LCA)method is essential in assessing the desertification of ecosystems,especially for susceptible ecosystems with high degradation risks.The aim of the present study was to evaluate the desertification potential of Lorestan Province,Iran,based on the LCA method.We selected aridity,fire and dust as three indicators of desertification and collected data from 2000 to 2015.We divided the study area into 6 types of ecoregions according to the climate types(arid,semi-arid and dry sub-humid)and dominant species(Quercus brantii and Astragalus adscendens),and calculated the characteristic factor(CF)of each indicator(aridity,fire and dust)by combining the indicator layers and ecoregion layer of the study area.In a given ecoregion,the sum of CF values of aridity,dust and fire indicators represents the life cycle inventory(LCI)desertification value(the higher the LCI value,the greater the desertification potential).Then,we obtained the desertification potential map by combining and overlapping the ecoregions and the normalized indicators based on the LCA method.Aridity and fire exhibit significant impacts on desertification in the study area compared with dust.In the study area,semi-arid ecoregion with Quercus brantii as the dominant species is the largest ecoregion,while arid ecoregion with Quercus brantii as the dominant species is the smallest ecoregion.Arid ecoregion with Astragalus adscendens as the dominant species(LCI desertification value of 1.99)and dry sub-humid ecoregion with Quercus brantii as the dominant species(LCI desertification value of 0.79)show the highest and lowest desertification potentials,respectively.Furthermore,arid ecoregion with Quercus brantii as the dominant species also has a higher LCI desertification value(1.89),showing a high desertification potential.These results suggest the necessity of proper management and appropriate utilization in these ecoregions.In general,assessing desertification potential using the LCA method on a local and regional scale can possibly provide a new methodology for identifying and protecting areas with high degradation risks.
文摘采用SEM、EDS、IR、TGA/DSC、固含量及pH分析方法对木素进行理化性能分析。将工作电极及对电极置于分别溶解不同木素的1.285 g/cm^(3)稀硫酸溶液中成三电极体系,对其进行循环伏安(CV)、线性扫描(LSV)及电化学阻抗(EIS)分析。装配2 V 10 Ah样品电池进行连续17.5%DoD循环寿命性能测试,验证出有利于铅酸蓄电池循环寿命的木素。通过对木素的理化性能和电化学性能进行综合分析,得出了更适合的木素性能的表征方法。
