天然杨桦林研究现状及经营策略

杨桦次生林是在各种次生裸地上发生次生演替而形成的天然群落，在涵养水源、保持水土、维系区域生态系统平衡和减免自然灾害等诸多方面均占居重要的战略地位。笔者在汲取国内外相关研究成果和学术观点的基础上，系统阐述了杨桦次生林的起源、地理分布、群落结构、演替动向及可持续经营等领域的研究现状和进展，指出了综合利用和高效经营方面存在的不足，展望了资源可持续经营和创新利用的广阔前景，提出了可持续经营的具体思路和对策。

Research Actualities and Management Strategies of Natural Poplar-Birch Forests

Secondary poplar-birch forests were natural communities formed from secondary succession on various types of secondary bare areas. They have played an important and strategic role in water and soil conservation, maintenance of regional ecosystem balance and reduction of natural disasters. Based on the related research achievements and academic viewpoints home and abroad, the research actualities and progress on secondary poplar-birch forests in their origin, geographical distribution, community structure, succession direction and sustainable management were systematically elaborated. Existing deficiencies in their comprehensive utilization and efficient management were pointed out. Broad prospects for the sustainable management and creative utilization of the resources were expected. Some specific ideas and coping strategies for their sustainable management were put forward.