林分密度对思茅松人工林根系生物量空间分布的影响  

The Effect of Stand Density on the Spatial Distribution of Root Biomass of Pinus kesiya var.langbianensis Plantation

作　　者：李帅锋[1,2] 贾呈鑫卓[3] 杨利华 黄小波[1,2] 郎学东[1,2] 刘万德[1,2] 苏建荣[1,2] LI Shuaifeng;JIA Chengxinzhuo;YANG Lihua;HUANG Xiaobo;LANG Xuedong;LIU Wande;SU Jianrong(Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, China;The Pu er Forest Eco- system Research Station, State Forestry Bureau, Kunming 650224, China;Southwest Forestry University, Kunming 650224, China;Forestry Research Institute of Pu er Municipality, Pu er,Yunnan 665000, China)

机构地区：[1]中国林业科学研究院资源昆虫研究所,昆明650224 [2]国家林业局普洱森林生态系统定位研究站,昆明650224 [3]西南林业大学,昆明650224 [4]云南省普洱市林业科学研究所,云南普洱665000

出　　处：《西北植物学报》2017年第11期2265-2272,共8页Acta Botanica Boreali-Occidentalia Sinica

基　　金：中央级公益性科研院所基本科研业务费专项(CAFYBB2014QA014);云南省科技计划项目(2013RA004);林业公益性行业科研专项(201404211)

摘　　要：以云南省普洱市思茅松人工林中14a龄林为研究对象,对5种造林密度(1m×1m、1.5m×1.5m、2m×1m、2m×2m、2m×3m)的思茅松人工林的林分特征及其根系生物量空间分布进行调查分析,以明确林分密度对思茅松人工林细根生物量空间分布的影响,为思茅松人工林经营管理提供理论依据。结果表明:(1)树高和胸径随着林分密度的减少呈增大趋势,而生物量呈减少趋势。(2)14a思茅松人工林的细根生物量随林分密度的增大而减少,单株细根生物量随林分密度的减小而增大,但粗根与死根生物量在5个林分密度之间无显著差异。(3)细根生物量主要分布在土壤上层,其中40.21%~54.73%的细根集中在0~10cm土壤深度,不同林分密度的细根生物量随土层深度的增加而减少的趋势较为明显,随着林分密度的减小,土壤上层的细根生物量比例呈先增加后减少的趋势。(4)林分密度和土壤深度对细根生物量有显著影响,而且乔木个体大小差异与细根生物量具有极显著的负相关关系,而单株细根生物量与林分密度、乔木个体大小差异、地下生物量及胸高断面积之间呈显著或极显著的负相关关系,而与树高和胸径之间呈显著正相关关系。Based on5afforestation densities(1m×1m,1.5m×1.5m,2m×1m,2m×2m and2m×3m respectively),we determined the effect of stand density on the spatial distribution fine root biomass and provided theoretical supports for plantation management and operation in a14-year-old plantation of Pinus kesiya var.langbianensis in Pu er City,Yunnan Province.The result showed that:(1)tree height and the diameter at breast height(DBH)increased with the decrease of stand density,while stand biomass increased with the increase of stand density.(2)The fine root biomass decreased with the development of stand density in the14-year-old P.kesiya var.langbianensis plantations,while the fine root biomass per single tree increased with the reduction of stand density.Meanwhile,the coarse and dead root biomass had no significant difference in five stand densities.(3)The fine root biomass mainly distributed in the soil surface,and40.21%-54.73%of fine root biomass focused on0-10cm of soil depth.The fine root biomass indicated the trend with decreased accompanied by the increase of soil depth in the different stand densities.(4)With the increase of stand density,the proportion of fine root biomass showed firstly increase,then decrease in the soil upper layer,stand density and soil depth had significant effect on the fine root biomass.Tree individual size inequality had a negative influence on the fine root biomass,while fine root biomass per singe tree had significant negative influences on the stand density,individual size inequality,belowground biomass and basal area at the DBH,with the positive influences on the DBH and height.

关 键 词：思茅松 人工林 林分密度 细根 粗根 生物量 

分 类 号：Q945.79[生物学—植物学] Q948.118