浅山丘陵区土地利用地形梯度特征与生态服务价值响应

基于研究区浅山丘陵区的地貌特征，引入地形位指数，从地形梯度上研究土地利用特征。在此基础上，采用生态服务价值评估模型分别研究地形梯度上的生态服务总价值和单项生态服务价值。结果表明:（1）研究区低地形位区段（1～10）为耕地、建设用地和水域的优势分布区；中地形位区段（10～25）是草地和林地的优势分布区；高地形位区段（25～50）是林地的优势分布区。（2）林地的生态系统服务总价值最大，未利用地最小；土地生态服务总价值的地形位差异明显，地形位1—3级别上呈上升趋势，3—6级别上生态服务逐渐下降，在6—24级别上波动上升，在24级别达到峰值，然后随着级别增大开始下降，在49级别达到最小值。（3）保持土壤、气体调节、维持生物多样性的单项生态系统服务价值较大，提供美学景观和食物生产价值比重较小。食物生产、废物处理、水源涵养优势分布区间为地形位1～12；原材料生产、气体调节、气候调节、水源涵养、保持土壤、维持生物多样性、提供美学景观的服务价值优势分布区间集中在地形位16～50。

Terrain Gradient Features and Response of Ecological Services Value in Shallow Hilly Region

Based on the geomorphic features of shallow hilly land in the study area, the land use of the terrain gradient features is studied by topographic index. On this basis, the terrain gradient on the ecological service value and single ecosystem servic valueare were studied respectively by the ecological service value evaluation model. The results show that: (1) the low terrain section (1～10) is the advantage distribution areas of cultivated land, construction land and water area in the study area, the middle terrain section (10～25) is the advantage distribution areas of grassland and woodland area; the high terrain section (25～50) is the distribution areas advantage of forest land area; (2) the maximum ecosystem service total value is forest,the minimum is unused land; land ecosystem service value of terrain difference is marked, the increasing trend of terrain was the level of 1—3, 3—6 level ecological service gradually declined, fluctuately rose at the 6—24 level, peaked at 24 level, and then began to decline with increase level, 49 level reached the minimum value; (3) the soil conservation service value is maximum and the food production service value is minimum in single ecosystem service value; and 9 class single production service value index in terrain section assumes the fluctuation distribution. Food production, waste disposal, water conservation for terrain advantage distribution interval 1～12; advantage distribution range of the service value of aesthetic landscape provided by raw material production, gas regulation, climate regulation, water conservation, soil conservation,and maintaining biodiversity is focused on the terrain of 16～50.