【摘要】 通过建立径流场进行不同整地方式对杉木人工林生态系统影响的 5年定位研究表明 ,南方林区传统的整地方式导致了杉木人工林生态系统严重水土流失。不同整地方式林地水土流失表现为 :全垦 >带垦 >穴垦 ;随整地破土面增大 ,林地表层土壤砂质化愈明显 ,林地养分含量下降 ,整地对林地的干扰主要集中在 0～ 2 0cm土层 ;不同整地方式杉木生长效应表现为 :全垦 >带垦 >穴垦 ,随时间推移 ,整地对杉木生长的影响逐年缩小 ,传统人工造林的整地方式是干扰杉木人工林生态系统的重要人为因子更多还原

【Abstract】 Effects of site preparations on ecosystem of Chinese fir plantations have been studied through plots monitoring for five years .The results indicate that traditional site preparation leads to serious losses of soil and water. The loss amounts caused by different methods of site preparation are in the sequence of overall site preparation>strip site preparation>spot site preparation. The upper soil layer becomes arenaceous and its nutrient concentration decreases with increase of interference degree by site preparations. The soil in the layer of 0 cm～20 cm is most strongly interfered. The growth responses of Chinese fir trees to different site preparation methods are in the sequence of overall site preparation >strip site preparation>spot preparation. The effects of site preparation on growth of Chinese fir decrease as time goes by. Therefore, traditional site preparation of Chinese fir plantations is an important artificial factor to disturb its ecosystem.更多还原