湖北咸宁杉木短周期栽培模式密度效应试验  

Density effect of a short-cycle cultivation model of Cunninghamia lanceolata in Xianning,Hubei province

作　　者：韩武孝 袁慧 杜超群[2] 王起富 许业洲[2] 邓湘雯[1] HAN Wuxiao;YUAN Hui;DU Chaoqun;WANG Qifu;XU Yezhou;DENG Xiangwen(College of Fife Science and Technology Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Hubei Academy of Forestry,Wuhan 430075,Hubei,China;Institute of Forestry Science in Xianning,Xianning 437000,Hubei,China)

机构地区：[1]中南林业科技大学生命科学与技术学院,湖南长沙410004 [2]湖北省林业科学研究院,湖北武汉430075 [3]咸宁市林业科学院,湖北咸宁437000

出　　处：《中南林业科技大学学报》2023年第3期82-90,98,共10页Journal of Central South University of Forestry & Technology

基　　金：国家重点研发计划项目子课题(2016YFD0600302-4);湖北省林业科技支撑项目“杉木人工林质量提升与固碳增汇关键技术研发”([2022]LYKJ03)。

摘　　要：【目的】探讨不同密度造林试验中林木生长差异和直径结构分布规律,为杉木短周期经营模式合理密度栽培提供理论参考。【方法】以湖北咸宁4~6年生杉木密度试验林为研究对象,比较分析A(2 500株/hm^(2))、B(3 333株/hm^(2))、C(4 444株/hm^(2))和D(6 666株/hm^(2))4种不同造林密度对杉木胸径、树高、单株材积、单位面积蓄积量及直径结构分布规律及其差异。【结果】林分平均胸径和平均单株材积及其连年生长量和年平均生长量均随密度增大依次递减,总生长量的递减幅度随着年龄的增大而增大,而密度对林分平均树高的影响无差异,对平均胸径和平均单株材积的各生长量的影响也均未达到显著水平;林分单位面积蓄积量及其连年生长量和平均生长量随密度增大依次增大,且不同种植密度间差异达到显著水平(P <0.05),B、C、D密度比A密度大30.5%~128.0%,但其增幅随着林龄增大而递减;林分直径结构分布均呈单峰右偏曲线、总体上尖削度较大,较高密度林分≥8 cm径级的立木株数比例较低密度林分略小,但立木株数均显著高于低密度林分(P <0.01),其中6年生D密度林分≥8 cm径阶的立木株数是A密度林分的两倍。【结论】造林密度对中幼林林木平均胸径、平均树高、平均单株材积影响不显著,而较高密度林分的单位面积蓄积及≥8 cm径阶立木株数显著增加,即较高密度可能收获较多的木材收益。【Objective】This paper discussed the growth differences and diameter structure distribution in the afforestation experiments with different stand densities,so as to provide theoretical references for the reasonable density cultivation of Cunninghamia lanceolata in a short-cycle plantation management mode.【Method】This study took the 4-6 year old Cunninghamia lanceolata test forest in Xianning,Hubei Province as the research object,we compared and analyzed the distribution laws and effects of four different stand densities(A(2500 tree/hm2),B(3333 tree/hm2),C(4444 tree/hm2)and D(6666 tree/hm2))on the DBH,tree height,single tree volume,volume per unit area and diameter structure of C.lanceolata seedlings.【Result】The average DBH,average volume per tree and their annual growth as well as the mean of the annual growth decreased with the increase of density,and the decreasing range of the total growth increased with the increase of stand age.The effect of density on the average tree height of the stand was not significant,and its effect on the growth of the average DBH and volume per tree did not reach a significant level.The stand volume per unit area,its annual growth and average annual growth increased with the increase of density,and the difference among planting densities reached a significant level(P<0.05).The density of stands B,C and D was 30.5%-128.0%higher than that of stand A,but the increase of B,C and D decreased with the increase of stand age.The distribution of stand diameter structure showed a single peak right deviation curve,with an overall large taper.The proportion of standing trees with a diameter≥8 cm in the high-density stand was slightly smaller than that in the low-density stand, but the number of standing trees was significantly higher than that in the low-density stand (P < 0.01). The number of standing trees with a diameter ≥ 8cm in the 6-year-old D-density stand was twice that in the A-density stand. 【Conclusion】Afforestation density has no significant effect on average DBH,

关 键 词：杉木 生长量 短周期 高密度 林分直径结构 

分 类 号：S791.27[农业科学—林木遗传育种]