杉木大径材林下套种红锥生长效果分析

Growth of Big-diameter Timber plantation of Chinese fir (Cunninghamialanceolata) Plantation Interplanted With Castanopsishystrix

在福建省政和国有林场选择26年生杉木人工林开展了三种不同杉木保留密度(405株/hm^2、495株/hm^2和585株/hm^2)处理的大径材林下套种红锥和乐东拟单性木兰的林木生长效应试验。试验12年后的调查和分析结果表明:保留密度为405株/hm^2的处理是最佳的杉木大径材套种模式,林木总蓄积量(281.1m^3/hm^2)、杉木平均胸径(25.07cm)、树高(20.59m)、单株材积(0.50476m^3)均为3种处理中最高的,而杉木蓄积量为204.3m^3/hm^2则是最低的,差异均达显著水平;林下套种的红锥平均胸径、树高、单株材积、蓄积量分别为12.60cm、13.75m、0.08944m^3、67.1m^3/hm^2,均显著高于其他两种处理;林下套种的乐东拟单性木兰平均胸径、树高、单株材积、蓄积量分别为10.74cm、10.00m、0.04981m^3、9.7m^3/hm^2,除了平均树高外,均显著高于其他两种处理。红锥在杉木林下生长情况比乐东拟单性木兰好,是较好的杉木大径材林下套种阔叶树种。杉木大径材林下套种红锥经营模式应该选择在较好的立地条件下实施。

Three different Chinese fir plantations （405 plants/hm^2, 495 strain · hm^2 and 585 plants/hm^2） were selected from the 26-year-old Chinese fir （Cunninghamialaneeolata） plantation in Fujian provincial and state owned forest farms to studythe effects of interplanting red cone and Leymusorientalis on tree growth.Growth of big- diameter timber plantation of Chinese fir interplanted with C.hystri：c and P.lotungensis for 12 years was studied.In- terplanting model with remaining density 405 stemohm^2 was the best model and total stand volume （281.1 m^3/hm^2）, DBH （diameter at breast height） （25.07 cm）,tree height （20.59 m） and single tree volume （0.50476 m^2） were the highest among the 3 treatments,but the volume of Chinese fir （204.3 m^3/hm^2） was the lowest, and the differences were significant. Mean DBH, tree height, single tree volume and volume of interplanted C.hystriawere 12.60 cm, 13.75 m,0.08944 m^3 and 67.1 m^3/hm^2,respectively,and they were significantly higher than those of the other two treatments.Mean DBH, tree height, single tree volume and stand volume of interplanted P.lotungensis were 10.74 cm, 10.00 m, 0.04981 m^3 and 9.7 m^3/hm^2, respectively, except for tree height which were significantly higher than those of the other two treatments.Growth performance of C.hystriawas better than P.lotungensis, and it was a good broad--leaved tree species interplanted with big--diameter timber Chinese fir plantation. High site quality was recom- mended to interplant C.hystrixc with big--diameter timber plantation of Chinese fir.