一、防护林体系研究的辩证发展防护林体系研究的辩证发展是林业生产发展和社会实践需要的结果。生态建设的经济化和经济发展的生态化是人类在发展与环境危机中的文明觉醒,其广泛性和深刻性正不断体现在社会的各行业、各层次。在农业由“传统型”向“生态型”迈进的过程中,林业也由“传统林业”走向“综合性林业”、“生态林业”。 First, the dialectical development of shelterbelt system The dialectical development of shelterbelt system research is the result of forestry production development and social practice. The economic development of ecology and the ecologicalization of economic development are the awakening of civilization in the crisis of human development and environment. Its extensiveness and profoundness are constantly reflected in all walks of life and at all levels of society. In the process of agriculture moving from “traditional ” to “ecological ”, forestry has also moved from “traditional forestry” to “comprehensive forestry” and “ecological forestry”.