豫南杉木人工林主伐年龄研究

Study on the Cutting Age of Chinese Fir Plantation in the Southern Area of Henan Province

通过对豫南杉木人工林不同立地指数级标准地和生产经营经济指标的调查，利用Richards等经典方程拟合豫南杉木生长的基本模型。编制生长过程表，确定数量成熟龄和工艺成熟龄，采用净现值和内部收益率分析杉木经济成熟龄。综合考虑数量成熟龄、工艺成熟龄和经济成熟龄结果表明：8立地指数不适合营造杉木用材林；10立地指数只能培育小径材，主伐年龄为22-24a；12立地指数以培育小径材为主，主伐年龄为20a。以培育中径材为辅，主伐年龄为22a；14立地指数以培育中径材为主，主伐年龄可确定为20a。

Chinese fir plantation standard plots and managing economic indexes of different site index in the southern area of He＇ nan were investigated. Classic equation such as Richards equation was fitted into the fundamental model for Chinese fir growth. Growth process table was compiled. Quantitive maturity age and technical maturity age were determinated. Net present value and internal benefit rate were used to analyse economical maturity age. Considering all maturity age including number maturity age, technological maturity age and economic maturity age, the results showed that it wasn＇ t adapt to plant Chinese fir timber in the southern area of Henan Province under cite index 8. It was only cultivating small diameter log that the cutting age was 22--24 a in cite index 10 ; The cutting age was 20 a when it was cultivating small diameter log as the main and the cutting age was 22 a when it was cultivating mid-diameter log as the assistance;The cutting age is 20 a when it was cultivating mid-diameter log as the main in cite index 14.