摘要
2016年11月对福建省洋口国有林场16年生杉木中龄林按照保留密度900、1050、1200株/hm2间伐,2017年2月分别套种火力楠900、750、600株/hm2,2024年9月对形成的24年生杉木—9年生火力楠异龄复层混交林进行调查.结果表明:随着杉木间伐保留密度增加,杉木树高、胸径、单株立木材积和火力楠的树高、冠幅、胸径、单株立木材积生长量减少.不同处理组合间杉木、火力楠树高、胸径、单株立木材积和林分蓄积量存在极显著差异.杉木保留900株/hm2套种火力楠900株/hm2处理组合的林分生长最优,总蓄积量302.36 m3/hm2,其中24年生杉木达到福建省杉木速生丰产林大径材生长量指标,平均树高16.53 m、胸径23.37 cm、单株立木材积0.3855 m3,分别比不间伐不套种的林分增加19.35％、32.33％、90.00％;9年生火力楠平均树高7.35 m、胸径9.56 cm,超过10年生火力楠人工林生长量指标.试验结果可为闽北杉木中心产区高质量培育杉木大径材和火力楠珍贵用材提供参考.
Abstract
In November 2016,under the middle-aged 16-year-old Cunninghamia lanceolata stand was retained ac-cording reserve densities 900,1 050 and 1 200 plants/hm2 in Fujian Yangkou State-Owned Forest Farm.In Febru-ary 2017,900,750 and 600 plants/hm2 M.macclurei were according reserve,and in Septemer 2024,the uneven-age multi-layer mixed forest of 24-year-old Cunninghamia lanceolata and 9-year-old M.macclurei were investigated.The results showed that with the increase of retained intensity,the Cunninghamia lanceolata in height,DBH,standing wood volume,and M.macclurei in height,crown width,DBH,standing wood volume decreased.There were extremely significant differences in height,DBH,standing wood volume and stand volume of Cunninghamia lanceolata and M.macclurei among different treatment combinations.The growth effect of keeping 900 plants/hm2 of Cunninghamia lanceolata and interplanting 900 plants/hm2 of M.macclurei is the best,with a total stand volume of 302.36 m3/hm2.Among them,the 24-year-old Cunninghamia lanceolata trees reached the growth index of large-diameter timber of fast-growing and high-yield forests in Fujian Province,with an average tree height of 16.53m,DBH of 23.37cm,and tree volume per tree of 0.3855m3.The increases were 19.35％,32.33％and 90.00％com-pared with the stands without thinning and interplanting,respectively.The average tree height,DBH of 9-year-old of M.macclurei were 7.35 m,9.56 cm,which was more than the growth standard of 10-year-old plantation of M.macclurei.The test results can provide a reference for cultivating high-quality large-diameter timber of Cunning-hamia lanceolata and M.macclurei precious materials to North Fujian Cunninghamia lanceolata central area of production.
维普
万方数据