云南松天然更新幼苗和幼树期的生长动态分析  

Analysis Growth Dynamic of Pinus yunnanensis Seedlings and Treelets by Natural Regeneration

作　　者：王文俊 张薇[1,2] 李莲芳 汪亚愈[2] 杨文君[2] WANG Wenjun ZHANG Wei LI Lianfang WANG YaYu YANG Wenjun(Forestry Bureau of the Yangbi Yi nationality Autonomous County, Yangbi 672500, Yunnan, China Southwest Forestry University ,Kunming 650224, Yunnan , China)

机构地区：[1]漾濞彝族自治县林业局,云南漾濞672500 [2]西南林业大学,云南昆明650224

出　　处：《福建林业科技》2017年第3期75-81,共7页Journal of Fujian Forestry Science and Technology

基　　金：国家自然科学基金(云南松蹲苗机理的研究;31170585)

摘　　要：为探究云南松天然更新幼苗(年龄≤1 a)和幼树(年龄>1 a)生长特征及不同器官生物量的分配关系,在云南昆明宜良禄丰村林场尖山林区约4.0 km2范围50余年生云南松(Pinus yunnanensis)人工林内,采用固定样地(17块5 m×5 m样地)开展连续4 a的天然更新幼苗和幼树生长调查。结果表明,样地内2年生、3年生、4年生幼树的平均地径分别为0.85~7.59、1.08~10.88、0.98~12.79 mm,平均树高分别为3.1~6.7、2.9~8.6、3.3~10.9 cm;1~9年生幼苗和幼树高与年龄呈指数相关。1~4年生的幼苗和幼树根系、胚轴、主杆、针叶的生物量分别为0.079~3.684、0.078~1.774、0.076~2.7474、0.270~9.186 g·株^(-1),仅根系的生物量比例(15.7%~21.2%)随年龄增长而明显增大。1~4年生幼苗和幼树的生物量主要分配于根系的构建,高生长缓慢而形成"蹲苗"现象。旱季土壤水分亏缺是天然更新云南松幼苗或幼树蹲苗的关键因素。In order to detect the growth dynamic and biomass distribution to different organs of Pinus yunnanensis seedlings （Age≤1-year-old） and treelets （Age 1-year-old） by natural regeneration.The 17 fixed sampling plots （SPs） of the 5 m × 5 m area in a total 4.0 km^2 woodland for an about 50-year-old P.yunnanensis plantations were set to continuously conduct investigation for 4 years in Jianshan Forest Zone of Lufengcun Forestry Centre,Yiliang County,Kunming,Yunnan.The results show that mean basal diameters （BD） were 0.85 ～7.59,1.08～10.88,0.98～12.79 mm,and tree heights （TH） were 3.1～6.7,2.9～8.6,3.3～10.9 cm for 2～4-year-old treelets in the SPs.There were exponential correlation between the TH and the ages for 1～9-year-old seedlings and treelets.Mean oven-dried biomass of roots,hypocotyls,stems and leaves were 0.079～3.684,0.078～1.774,0.076～2.747,0.270～9.186 g·treelet^（-1）,respectively,for 1～4-year-old seedlings and treelets.The root biomass percentage （15.7%～21.2%）rapidly increased with the age growth.The biomass of the treelets primarily distributed to root system construction for 1～4-year-old seedlings and treelets,while the TH growth of seedlings or treelets was much slow,which leads to occur the phenomenon of ＂grass stage＂.The soil water deficit in dry season was a part of pivot factor components for appearing phenomenon of grass stage of natural regeneration P.yuannanensis seedlings or treelets.

关 键 词：云南松 生长动态 树高 生物量 

分 类 号：S791.257[农业科学—林木遗传育种]