摘要
[目的]调查与堆积带不同间距的不同林龄杉木人工林生长情况,并分析其土壤大量及微量养分元素含量。[方法]以不同林龄(1~5年生)杉木人工幼林为研究对象,分析与采伐剩余物堆积带不同距离(1.7、3.4及5.1m)的下部条带杉木幼林生长以及土壤养分含量变化。[结果]从生长量指标上看,早期生长阶段(1~2年),幼林地径及树高生长表现为:距采伐剩余物堆积带较远的下部条带>距堆积带较近的下部条带;而后期生长阶段(3~5年),幼林胸径(地径)及树高生长表现为:距堆积带较近的下部条带>距堆积带较远的下部条带。不同林龄杉木枝下高均表现为:距堆积带3.4m>距堆积带1.7及5.1m,冠幅均表现为:距堆积带3.4m<距堆积带1.7及5.1m。从土壤养分含量上看,早期生长阶段(1~2年),幼林同一土层土壤全氮、全碳、全磷含量总体表现为:距堆积带较远的下部条带>距堆积带较近的下部条带,而后期生长阶段(3~5年),则表现为:距堆积带较近的下部条带>距堆积带较远的下部条带;微量元素含量均表现为:距堆积带较远的下部条带>距堆积带较近的下部条带。[结论]在幼林早期生长阶段,杉木生长及土壤养分元素含量主要受坡位的影响;在后期生长阶段主要受坡位及采伐剩余物分解速度的综合影响。
[Purpose]To investigate the effect of strip clear-up of harvesting residues on the growth of fir(Cunninghamia lanceolata)trees of different ages with different spacing from the stacking belt and to analyze the contents of soil large and trace nutrient elements.[Method]With different forest age(1 to 5 years)juvenile fir forest after strip clean-up as the research object,the lower strip fir growth and soil nutrient content changes were analyzed at different distances(1.7,3.4 and 5.1 m)from the logging residue accumulation zone.[Result]For the perspective of growth index,at the early growth stage(1 to 2 years),the forest land diameter(DBH)and tree height values in the lower strip farther away from the logging residue accumulation zone were larger than those closer to the zone,while during the later growth stage(3 to 5 years),the DBH and tree height values in the lower strip closer to the accumulation zone were larger than those farther from zone.The under branch height of different forestk-aged fir saplings located at 3.4 m from the logging residue accumulation zone was taller than those at 1.7 and 5.1 m from the accumulation zone.For tree crown width,the opposite was true.From the perspective of soil nutrients,during the early growth stage(1 to 2 years),the total contents of major elements such as nitrogen,carbon and phosphorus from the same soil layer were generally greater for the lower strip farther from the accumulation zone than those from the lower strip closer to the accumulation zone.However,during the late growth stage(3 to 5 years),the contents of major elements were generally larger for the lower strip closer to the accumulation zone than those of the lower strip farther away from the accumulation zone.Greater numbers of soil trace elements′contents were observed from the lower strip farther away from the accumulation zone those from the lower strip closer to the accumulation zone.[Conclusion]The tree growth and soil nutrient contents were mainly affected by slope level in the early growth stage of the young C.lanceolata forests,while in the late growth stage,the tree growth and soil nutrient contents were affected by both the slope level and the decomposition speed of logging residues.
作者
江上喜
JIANG Shangxi(National Forest Farm of Shunchang Pushang County,Shunchang,Fujian 353205,China)
出处
《亚热带农业研究》
2019年第2期85-90,共6页
Subtropical Agriculture Research
基金
国家“十三五”重点研发计划项目(2016YFD0600301)资助
关键词
带状清理
生长量
土壤养分
杉木人工幼林
zonal clean-up
growth
soil nutrients
artificial juvenile forests of Cunninghamia lanceolata
