综合生态与社会效益的辽西北沙化土地生态治理成效评估模型

An evaluation model of ecological management effectiveness combining ecological and social benefits for desertified land of northwest in Liaoning,China

辽西北是阻止科尔沁沙地侵入华北平原和东北平原的重要生态屏障,开展该区域生态治理成效评估具有重要意义。为了更加全面地评估沙化土地生态治理成效,本文建立了顾及生态效益和社会效益的沙化土地治理成效评估模型。利用多源遥感数据和地面调查统计,基于建立的综合模型评估辽西北十县沙化土地生态治理成效,并依据遥感数据之间的交叉验证和野外调查结果,分析模型关键技术的合理性和可靠性。结果表明:①利用Landsat和Sentinel-2数据,交叉验证模型估算的生态效益单一指标和综合指标,发现相同指标结果之间具有较强的相关性,Pearson系数介于0.61~0.84,p<0.01;②模型估算的FVC与野外调查的植被盖度间也具有较强的一致性,Pearson系数达0.76,p为0.016,表明了模型关键技术的合理性;③利用综合评估模型评估辽西北十县沙化土地生态治理成效时,发现其在时间和空间上变化不稳定。综上,建立的成效评估模型较好地综合了沙化土地治理的生态效益和社会效益,可为其他生态治理成效或生态修复成效评估提供参考,但针对不同区域时模型参数需加以调整。

Northwest Liaoning is an important ecological barrier to prevent the Horqin sandy land from invading the North China Plain and the Northeast China Plain.It is of great significance to evaluate the effectiveness of ecological management.To evaluate the effectiveness of desertified land ecological management,weestablish an evaluation model for the effectiveness of desertified land management,whith takes ecological and social benefits into account.Using multi-source remote sensing data and ground survey statistics,a comprehensive model is established to evaluate the effectiveness of desertified land ecological controlin northwestern Liaoning.Based on the cross-validation between remote sensing data and field survey results,the rationality of the key technologies are analyzed.The results show:①By using Landsat and Sentinel-2 data,it is a cross-validation of the singleand comprehensive index of ecological benefit estimated by the model,there is a strong correlation between the results of the same index,and the Pearson coefficient is between 0.61 and 0.84,p<0.01.②The FVC estimated by the model and the vegetation coverage of the field survey also have a strong consistency,the Pearson coefficient is 0.76,p is 0.016,which shows the rationality of the key technology of the model.③The model is used to evaluate the effectiveness of desertification land ecological management in ten counties in northwestern Liaoning,the changes are unstable in time and space.In summary,the effectiveness evaluation model established can better integrate the ecological and social benefits of desertification land management,and provide references for other ecological management effectiveness evaluations,but the model parameters need to be adjusted for different regions.