基于土地利用变化的甘肃省黄河流域生态系统服务价值研究北大核心CSCD

为探究1995—2020年甘肃省黄河流域基于土地利用的生态系统服务价值时空变化,选取甘肃省黄河流域1995、2000、2005、2010、2015、2020年6期土地利用数据,分别利用土地利用动态度、土地利用程度指数和土地利用转移矩阵分析了研究区土地利用时空变化特征;通过对单个生态系统服务价值当量的经济价值进行修正,计算分析了研究区6个不同时期的生态系统服务价值,进而探讨了研究区土地利用程度对生态系统服务价值的影响。结果表明:(1)1995—2020年,研究区耕地和未利用地面积总体减小,林地、草地、水域和建设用地面积总体增加,变化最大的是建设用地;(2)1995—2020年,研究区草地的土地利用程度最高,其他地类转为草地的面积最大;(3)1995—2020年,研究区生态系统服务价值总体呈增加趋势,共增加5.104亿元;(4)从2020年土地利用类型来看,草地的生态系统服务价值最大,达255.016亿元;从2020年生态系统服务类型来看,保持土壤生态服务价值最大,达87.94亿元;从生态敏感性指数来看,研究区生态系统服务价值敏感性指数均<1,研究结果可信;从生态系统服务加之分级来看,中级比重较大,面积占比为82.07%;(5)研究区土地利用程度与生态系统服务价值呈显著负相关,相关系数为0.912。

Study on ecosystem service value of the Yellow River Basin in Gansu Province based on land use change

To investigate the spatial-temporal changes of ecosystem service value based on land use of the Yellow River Basin in Gansu Province from 1995 to 2020， this thesis choose the land-use data of the Yellow River Basin in Gansu Province in 1995， 2000， 2005， 2010， 2015 and 2020， using land use dynamics， land use degree index， and land use change matrix to examine the spatial-temporal change features of land use in the research region. The ecosystem service value at six periods in the research region was computed and studied by correcting the economic value of the service value equivalent of a single ecosystem， and then the influence factors of ecosystem service value in the research region was analyzed. The findings reveal that： （1） The total area of cultivated and unused land in the research region declined from 1995 to 2020， while the total amount of forest land， grassland， water area， and building land increased. Construction land had the highest pace of change. （2） From 1995 to 2020， grassland had the highest degree of land usage in the research region. The area of conversion from other land types is the biggest for the grassland. （3） An overall increasing trend in the value of ecosystem services was observed in the study area from 1995 to 2020， with a total increase of 510.4 million RMB. （4） In terms of land use types， grassland had the highest ecosystem service value， at 25.5016 billion RMB in 2020； In terms of ecosystem service type， soil conservation had the highest value， at 8.794 billion RMB in 2020； In terms of the ecological sensitivity index， the value of ecosystem services in the study region had a sensitivity index of <1， and the research findings are reliable. The intermediate proportion was higher （82.07%） when considering ecosystem services plus categorization. （5） There is a significant negative correlation between the degree of land use in the research region and ecosystem service value， with a correlation coefficient of 0.912.