浑善达克榆树疏林自然保护区缓冲区宽度研究

 世界上建设有很多森林自然保护区以保护各种类型的森林，自然保护区的核心区外围常常要求建设缓冲区，但是如何设计缓冲区宽度的研究很少。土壤种子库是衡量退化森林生态系统生态恢复潜力的重要指标，利用种子库进行缓冲区的设计。采用植物群落学调查及种子库分析的方法，在核心区内外选择一系列样方，调查样方种子库及其地面的植物种类组成，计算样方与核心区种子库、植物群落的相似性指数，根据核心区外不同距离的样方的相似性指数，确定了缓冲区的宽度。研究结果发现，缓冲区最低宽度在低地为300 m，在流动沙地为600 m，在固定沙地和半固定沙地为1 000~1 200 m。对于沙漠化地区的自然保护区缓冲区的设计有一定的借鉴价值。

Determining the Width of Buffer Zone for Open- Forest Nature Reserve in Hunshandak Sandland

Many nature reserves have been established for conserving forests throughout the world. Creating a buffer zone around a core area is often suggested, but determining the width of the buffer zone is a challenge. The soil seed bank is an important indicator for the restoration capacity of a degraded vegetation ecosystem. This could be useful for designing nature reserves. According to the restoration potential and similarity index of seed banks of some sites with different distances from the core zone, the minimum width of a buffer zone can be determined. Different samples, outside of the core zone, with a different distance from the boundary of the core zone were chosen. Analysis of variance was used to analyze species, seedling and seed banks among different samples, the Sorensen-s similarity index was calculated. Based on a field survey, the buffer zone of the open-forest nature reserve in Hunshandak Sandland, China has been designed. The minimum width of buffer zone should be 300 m in lowland, 600 m in shifting sandy dunes, and 1 000~1 200 m in fixed and semi-fixed sandy dunes. Seed bank approaches will be useful for determining the buffer zone width of the forest nature reserve and can be applied and extended to the other nature reserves which aim at preserving endangered species/ecosystems and their habitats.