基于InVEST模型的生境质量评估--以横断山小江流域为例

目的]评估横断山小江流域生境质量,为改善流域生态环境和优化土地利用现状提供理论支持。方法]采用In VEST模型,利用道路、农田、城市、乡镇及土地利用等数据,从生物多样性的角度,对横断山区小江流域的生境质量进行了量化评估,并分析其空间分布特征和区域差异。结果]1受人类活动的影响,小江流域生境质量普遍偏低,流域中部区域退化严重。2土地利用类型和覆被对生境质量有很大的影响作用,还林还草政策可有效的缓解流域生境恶化现象。3小江流域生境质量具有明显的垂直空间异质性,生态环境的保护和社会经济的发展要因地制宜。结论]该研究可为小江流域的生态保护和可持续发展提供科学依据和规划指南。

Habitat Quality Evaluation Based on InVEST Model-A Case Study of Xiaojiang Watershed of Hengduan Mountains

Objective] The aim was to evaluate habitat quality of Xiaojiang watershed of Hengduan Mountains,to provide theoretical support for improving eco-environment and optimizing land use status.Method] The InVEST model was used to quantify and evaluate the habitat quality in Xiaojiang watershed of Henduan Mountains by using theland use data,including roads,farmlands,cities and towns.In addition,the spatial distribu-tion features and regional differences were analyzed.Result] The results showed that:① The habitat quality was generally low and the heavily degraded area was in the center of the river basin.②Land use and land cover type had a significant impact on habitat quality,and the strategy of returning the grain plots to forestry and grass had mitigated the deterioration of habitat quality effectively .③ The habitat quality in Xiaojiang wa-tershed showed the heterogeneity of vertical space .The protection of ecological environment and development of social economy should be acted according to local conditions.Conclusion] The study can provide scientific basis and planning guidance for ecology protection and sustainable development of Xiaojiang watershed.