连栽杉木人工林生产力的模拟与预测

应用森林生态系统管理与预测模型（ＦＯＲＴＯＯＮ）对连栽杉木人工林不同经营措施进行模拟。通过对结果的对比分析表明，三代连栽的杉木林在生物量和立地质量方面呈逐代下降的趋势；选用下层疏伐法对林分生长较有利；施用有机肥效果明显，可以迅速提高林地有效养分含量和林分生物量；清除枯落物会明显降低林分生物量。模拟结果与实际情况比较相符，证明了模型的有效性，可作为进一步模拟研究的基础，以便得到一个最佳的经营方案，为

Modeling of Chinese Fir Plantation Productivities in Different Rotations

Based on the published data from Huitong,Hunan Province,FORTOON,the forest management model,was applied to analogize the effects of different management measures on the growths of Chinese fir plantations at different successive rotations.The results of comparative analysis indicated that the biomass and site quality decreased gradually with the rotations.Oppressed stem thinning and fertilization improved the biomass growths and nutrients in forest floor.Otherwise,litter raking reduced the stand biomass obviously.The compliance of the modeling results with the field investigation demonstrated the validity of the model in predicting the impacts of some silvicultural measurements on long term forest productivity and soil fertility.Further improvements of the model,such as consideration of soil erosion,more friendly file format,are necessary for better and easier application.