砒砂岩区沙棘人工林生态系统服务功能评价指标权重初探

沙棘人工林是晋陕蒙砒砂岩区主要的退耕还林树种之一,在砒砂岩区生态环境治理中发挥着重要作用。通过理论分析、频度分析、专家咨询法构建了砒砂岩区沙棘人工林生态系统服务功能评价指标体系,运用AHP法、G1法、变异系数法确定各指标权重值,应用博弈论综合赋权法将主、客观权重进行组合,得到综合权重。结果表明:土壤侵蚀模数、土壤固氮速率、根系土壤层蓄水量、土壤固钾速率、植物物种丰富度等指标权重较大;应用博弈论综合赋权法可以更全面和客观地解决权重的确定问题,结果合理可行,方法具有通用性,可为综合评价砒砂岩区沙棘人工林生态系统服务功能提供依据。

Index weights for seabuckthorn plantation ecosystem services evaluation in the soft rock area

Seabuckthorn plantation is one of the main tree species for returning farmland to forest in the soft rock area in Shanxi,Shaanxi and Inner Mongolia.It Plays an important role in the eco-environmental governance in the soft rock area.Through theoretical analysis,frequency statistics and expert consulting,we established the ecosystem services evaluation index system of seabuckthorn plantation.The method of Analytic Hierarchy Process,Rank Correlation Analysis and Variation Coefficient were used to determine the weight value of each index.Game Theory comprehensive weight method was applied to obtain comprehensive weight from the combination of subjective and objective weights.The results showed that the index weights of soil erosion modulus,soil nitrogen fixation rate,water storage capacity of soil layer,soil fixed potassium rate,plant species richness were relatively larger than others.Application of Game Theory comprehensive weight method to determine the weights could be more comprehensive and objective.The results were reasonably practicable,and the method was universal,which could provide the basis for a comprehensive evaluation of seabuckthorn plantation ecosystem services in the soft rock area.