【摘要】 赣南地区是我国南方山地丘陵带的重要组成部分,属于我国重要的生态屏障带,生态保护意义重大。以赣南为研究区域,基于1990—2015年间的6期遥感影像,利用遥感、地理信息技术和空间统计的方法,研究了赣南地区基于地形梯度变化的土地利用结构及生态系统服务价值的时空分异,基于网格法分析了全区人为干扰度空间分布及其与地形梯度的关系,并对人为干扰度与生态系统服务价值的空间相关性进行了分析。研究结果表明:(1)随着地形梯度的上升,赣南地区的林地面积比例逐渐上升,其他用地类型的面积比例逐渐下降;其中林地和耕地的变化最为显著;(2) 1990—2015年间赣南地区的生态系统服务价值均随着地形梯度的上升而下降;在地形位指数为0.2164—0.6826的梯度1区域下降最为显著;(3)人为干扰分析显示,90%的高人为干扰度网格分布在低海拔和低坡度的地形梯度1区域,在其他地形梯度分布较少;(4)赣南地区生态系统服务价值和人为干扰度值存在极为显著的空间集聚现象,高-低型集聚区主要分布在地形梯度1的大余县、南康市、赣州市区、信丰县、瑞金市、会昌县、兴国县、于都县等8个县市,低-高型集聚区主要分布在地形梯度较高的崇义县和上犹县。分析了赣南地区生态系统服务价值的地形梯度变化及其与人为干扰度的空间聚类效应,为合理布局和保护我国南方丘陵的生态用地,发挥赣南地区的生态屏障作用提供了理论依据和决策支持。更多还原

【Abstract】 Gannan region,an important ecological barrier in southern China,is a typical mountain-hill area in Jiangxi Province,China,and its ecological protection is of great significance. In this study,using data of 5-year intervals from 1990 to 2015,land-use types and ecosystem service value in Gannan region were evaluated on the basis of the terrain gradient by using remote-sensing,geographic information technology,and spatial statistical methods. In addition,human interference and spatial correlation with ecosystem service value were investigated using the grid method. The results showed that( 1)the proportion of forests increased as the terrain gradient increased,and the other types of land use have gradually decreased,especially forest and farmland.( 2) The ecosystem service value in the Gannan region declined over the study period,and per unit area ecosystem service value reduced as the terrain gradient increased. Especially,terrain gradient 1,where the terrain index is between 0.2164 and 0.6826,was extremely decreased.( 3) Spatial analysis of human interference grading showed that 90% of high human interference was distributed in the area of terrain gradient 1,where the terrain features are low altitude and low slope,and only 10% were scattered in other gradients.( 4) Significant spatial aggregation distributions were observed between ecosystem service value and human interference in Gannan region,and the high-low aggregation was mainly distributed in 8 counties,namely,Dayu County,Nankang City,Ganzhou City,Xinfeng County,Ruijin City,Huichang County,Xingguo County,and Yudu County. The low-high aggregation was mainly distributed in Chongyi County and Shangyou County. The ecosystem service value and its spatial response to human interference were analyzed on the basis of the terrain gradient in Gannan region,and the results provided a theoretical basis and decision support mechanism for the rational layout and protection of ecological land in the hilly areas of southern China.更多还原