造林密度对红心杉幼林生长及土壤理化性质的影响  

Effects of Afforestation Density on Growth and Soil Physical and Chemical Properties of Young Forest for Red-heart Cunninghamia lanceolata

作　　者：莫德田 MO De-tian(Yingde Forest Farm,Qingyuan City,Guangdong Province,Qingyuan 511500)

机构地区：[1]广东省清远市英德林场,清远511500

出　　处：《温带林业研究》2023年第2期31-35,共5页Journal of Temperate Forestry Research

摘　　要：【目的】为优化杉木栽培措施,实现杉木林可持续经营。【方法】本试验以3、6、9年生红心杉幼林为研究对象,分析了1667、2501、3333株·hm^(-2)不同造林密度林分生长及土壤理化性质的变化。【结果】结果表明:造林密度显著影响了6和9生林分生长,整体上随着林龄增加,林分密度越大,树高、胸径、单株材积及蓄积量下降幅度越大。其中,与1667株·hm^(-2)林分相比,3333株·hm^(-2)林分各生长指标下降了22.0%~65.3%。相较1667和2501株·hm^(-2)林分,9年生3333株·hm^(-2)林分土壤容重增大、孔隙度降低,土壤中全氮、速效氮、速效钾含量均显著减少。此外,相较氮素,土壤中磷钾含量随着林龄增加均呈明显的下降趋势。【结论】供试3种造林密度中,以1667株·hm^(-2)造林密度林分生长及土壤性状均表现最佳,为进一步提升林地生产力,实现地力维持,应注重磷钾肥的补充。【Objective】In order to optimize the cultivation measures of Cunninghamia lanceolata and realize the sustainable management of Cunninghamia lanceolata forest.【Method】This experiment took 3,6 and 9-year-old young forest of redheart Cunninghamia lanceolata as the research object,and analyzed the growth and soil physical and chemical properties of different planting densities of 1667,2501 and 3333 plants·hm^(-2).【Result】The results showed that the planting density significantly affected the growth of 6 and 9-year-old stands.On the whole,with the increase of forest age,the greater the stand density,the greater the decrease of tree height,DBH,individual volume and volume.Compared with 1667 plants·hm^(-2),the growth indexes of 3333 plants·hm^(-2) decreased by 22.0%-65.3%.Compared with 1667 and 2501 plants·hm^(-2) stand,the soil bulk density of 9-year-old 3333 plants·hm^(-2) stand increased,the porosity decreased,and the contents of total nitrogen,available nitrogen and available potassium in soil decreased significantly.In addition,compared with nitrogen,the content of phosphorus and potassium in soil decreased significantly with the increase of forest age.【Conclusion】The results showed that the growth and soil properties of 1667 plants·hm^(-2) afforestation density were the best among the three afforestation densities.In order to further improve the productivity of forest land and maintain the soil fertility,the supplement of phosphorus and potassium fertilizer should be paid attention to.

关 键 词：红心杉 地力衰退 高效培育 密度调控 

分 类 号：S753.3[农业科学—森林经理学]