杉木人工林采伐迹地更新群落结构特征的研究

从杉木人工林科学经营和自然资源管理保护出发，根据定位研究和群落样地调查结果，分析和比较了湖南杉木中心产区会同杉木人工林不同采伐方式迹地上更新群落的组成结构和数量特征．结果表明：迹地群落中共有维管植物85科164属254种，其中乔木、灌木、藤本和草本分别为53种、85种、39种和77种；皆伐和间伐后物种多样性指数高；皆伐8a后迹地群落与皆伐2a后群落相似性较小，而与间伐8a后群落相似性较大；杉木人工林采伐迹地种类成分变更快．提出了合理经营和保护杉木林生态系统多样性和稳定性的措施．

Structural Characteristics of Regeneration Communities in the Cutting Blanks of Cunninghamia lanceolate Hook. Plantation

For the scientific management of Chinese fir plantation, the composition structure and quantitative characteristics of its regeneration communities cut with different ways in Huitong county of Hunan province, a major production area in China, have been analysed and compared on the basis of the data from fixed position observation and com munity plots survey. The results are as follows. Thefe is a floristic composition of about 85 families, 164 genera and 254 species in the cutting blank communities. Of them, 53 species belong to arbor, 85 species to shrub, 39 species to liana, and 77 species to herbs. The diversity indexes of clear-cutting and thinning-cutting blanks are high. The similarity of blank commnuities eight years after clear-cutting to blank communities two years after clear-cutting is significantly less than that to blank communities eight year after thinning cutting. The species composition of the cutting blanks of Cunninghamia lanceolate Hook. plantati0n varies rapidly. THe measures of rational management and protection of the ecosystem diversity of and and stability of Cunninghamia lanceolate Ho0k. plantation are provided.