Abstract: The low hilly area of northwest Liaoning Province is a region with arid climate,barren soil,and serious soil erosion. So far,no grass species suitable for regional ecological restoration have been selected. A scientifical evaluation system needs to be established. In this study,we established a comprehensive evaluation model to evaluate ecological restoration ability of native grass species in Liaoning Province using analytic hierarchy process (AHP),and evaluated the ecological restoration ability of 15 dominant native grass species. According to the frequency of plants in 280 survey plots,15 native grasses were selected for evaluation,among which Lespedeza daurica had the highest frequency (75.6%). According to the scores given by experts,environmental adaptability,soil and water conservation ability and reproductive ability were selected as three primary indexes,and drought resistance,cold resistance,spread,salt tolerance,root biomass,growth rate,tillering/branching number,and other parameters were selected as 14 secondary indexes. Among the 3 primary indexes,the weight of environmental adaptability was the highest (0.488 1),followed by soil and water conservation ability,and the reproductive ability was the lowest. Among the 14 secondary indexes,the weight of cold resistance,drought resistance,growth rate,tillering/branching number were higher than others. Based on the performance of native grass to be evaluated,the comprehensive score of its ecological restoration ability was calculated. The results showed that Artemisia stechmanniana,Arundinella hirta,Themeda triandra,Bothriochloa ischaemum and Achnatherum sibiricum were classified as excellent ecological restoration grass species. This study could provide an important reference for ecological restoration in northwest Liaoning.

Key words: Northwest Liaoning province, Semi-arid region, Ecological restoration, Analytic hierarchy process, Comprehensive evaluation

摘要： 辽西北地区气候干旱，土壤贫瘠，水土流失严重。现有研究尚未筛选出适合区域生态修复应用的草种，亟待建立科学的评价技术体系。本研究利用层次分析法构建了辽西北乡土草生态修复能力综合评价模型，并对15种优势乡土草种进行生态修复能力的评价。根据专家打分结果，选择环境适应性、水土保持能力和繁殖能力作为3个一级指标，选择抗旱性、抗寒性、广布性、耐盐性、根系生物量等14个指标作为二级指标。一级指标中，环境适应性权重最高，为0.488 1，水土保持能力次之，繁殖能力最低；二级指标中，抗寒性、抗旱性、生长速度、分蘖/分枝数等的权重较高。基于待评乡土草各指标的表现，带入评价模型，筛选出铁杆蒿(Artemisia stechmanniana)、野古草(Arundinella hirta)、黄背草(Themeda triandra)、白羊草(Bothriochloa ischaemum)和羽茅(Achnatherum sibiricum)为较好的生态修复用草，为辽西北地区的生态修复提供了科学的草种选择依据。

关键词: 辽西北, 乡土草, 生态修复, 层次分析法, 综合评价