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杉木林下套种闽楠不同规格容器苗生长效果分析

Analysis of Growth Effect on Cunninghamia lanceolata interplanted with Different Specifications Container Seedlings of Phoebe bournei （Hemsl.）Yang

    摘要
  • 摘要: 以杉木林下套种闽楠6种规格容器苗试验林为研究对象，对其造林后1～8 a林分进行动态跟踪，比较闽楠和杉木的地径、胸径、最大冠幅、树高、枝下高及杉木单株材积的差异。结果表明，杉木林下套种不同规格闽楠容器苗，造林当年、2 a、8 a后的闽楠Ⅰ级苗地径、最大冠幅、树高均高于Ⅱ级苗；3 aⅠ级苗造林的地径、胸径、最大冠幅、树高、枝下高生长量均最大，其年平均生长量分别达7.16 mm、7.40 mm、35.19 cm、63.20 cm、10.66 cm。造林8 a后，1 aⅡ级苗闽楠容器苗造林地内的杉木地径、胸径、单株材积均最大，分别达44.04 cm、36.53 cm、0.92 m3,分别比平均值高出11.38%、10.83%、21.05%;2 aⅡ级苗闽楠容器苗造林地的杉木最大冠幅、树高均最大，分别达6.86 m、21.53 m,分别比平均值高出10.47%、3.66%。综合闽楠和杉木的各指标分析，杉木林下套种闽楠3 aⅠ级苗，闽楠和杉木二者的平均综合评分最高，达0.7347;为促进杉木林下套种闽楠幼林的生长，兼顾杉木大径材的培育，建议选用闽楠3 aⅠ级苗进行杉木林下套种，造林效果好。

     

    Abstract: The experimental forest of Cunninghamia lanceolata interplanted with six specifications container seedlings of Phoebe bournei as the research object, the dynamic tracking of 1～8 years after afforestation was carried out, the ground diameter, DBH,maximum crown width, tree height, branch height of P.bournei（Hemsl.） and C.lanceolata,and individual volume of C.lanceolata were analyzed.The results showed that the ground diameter, maximum crown width and tree height of container seedlings gradeⅠwere higher than the same age seedlings gradeⅡof C.lanceolata interplanted with different specifications container seedlings of P.bournei in afforestation year, 2 years and 8 years after afforestation.The ground diameter, DBH,maximum crown width, tree height, branch height in December 2016,April 2018 and February 2024 and the corresponding growth of 7 years and 2 months of 3-year-old grade I seedlings were the largest, and the average annual growth was 7.16 mm, 7.40 mm, 35.19 cm, 63.20 cm and 10.66 cm, respectively.After 8 years of afforestation, the ground diameter, DBH and individual volume of C.lanceolata in the afforestation land of 1-year-old II container seedlings were the largest, reaching 44.04 cm, 36.53 cm and 0.92 m3,respectively, which were 11.38 %,10.83 % and 21.05 % higher than the average.The maximum crown width and tree height of C.lanceolata in the 2-year-old II container seedling afforestation land were the largest, reaching 6.86 m and 21.53 m, respectively, which were 10.47% and 3.66% higher than the average.Based on the analysis of each index of P.bournei and C.lanceolata,the average comprehensive score of C.lanceolata interplanted with 3-year-old grade I seedlings of P.bournei was the highest, reaching 0.7347.In order to promote the young P.bournei growth of C.lanceolata interplanted with P.bournei and take into account the cultivation of large-diameter timber of C.lanceolate,it was suggested that using C.lanceolata interplanted with 3-year-old grade I seedlings of P.bournei,whose afforestation effect is good.

     

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