求翻译：生态公益林是以发挥森林生态效益，维护和保持自然生态环境，保护生物多样性和丰富自然景观，具有涵养水源、固土保肥及碳贮库等生态功能，提高人类生活质量为主要任务的森林类型。是什么意思？

Ecological benefit of forest ecological public welfare forest in play, maintaining and preserving the natural ecological environment, protect the rich biodiversity and the natural landscape, water conservation, carbon storage and soil and fertilizer and other ecological features, improve the quality of human life as the main tasks of the forest type.