湘西喀斯特山区生态环境问题与综合整治战略

VULNERABLE CHARACTERISTICS OF ECOSYSTEM, ENVIRONMENTAL PROBLEMS AND COMPREHENSIVE STRATEGIES FOR ECOLOGICAL CONSTRUCTION IN THE KARST MOUNTAINOUS REGION OF WEST HUNAN

从区域自然景观空间结构、水土资源协调性、土壤形成能力、植物生产状况、生物资源聚集程度及生态系统稳定性等方面论述了湘西喀斯特斜坡地带生态系统脆弱特征，分析了水土流失与干旱灾害加剧等环境问题产生的原因，提出了生态环境综合整治的措施。

Karstlands in the West Hunan is characterized for its bare rock, leakage of surface water, poor soil_forming ability, scarcity of soil resources, low pace of plant growth and decentralization of life_form resources。 Thus it is typical ecologically vulnerable environments。 Owing to the excessive growth of population, local people opened up wasteland on the slope, which worsened the relationship between human and nature and led to the degradation of forest, pricked up soil erosion, drought and flood。 According to the principle of harmonious development between mankind and nature, five countermeasures for ecosystem management were presented as follows:1 enhancing the productivity of cultivated land and the ratio of foodstuff self_support;2 constructing agri_forest ecosystem ;3 building base of export product which based on features of mountainous area;4 organizing labor export and environmental migration。