平茬措施对云南松苗木生物量分配特征及相对生长关系的影响  

Effects of stumping treatments on biomass allocation patterns and relative growth relationships of Pinus yunnanensis Franch.seedlings

作　　者：蔡年辉[1,2] 唐军荣[1] 车凤仙 李亚麒 陈诗[1,2] 陈林 许玉兰[1,2] 李根前[2] CAI Nianhui;TANG Junrong;CHE Fengxian;LI Yaqi;CHEN Shi;CHEN Lin;XU Yulan;LI Genqian(Key Laboratory of Biodiversity Conservation in Southwest China,State Forestry AdministrationSouthwest Forestry University,Kunming,Yunnan 650224,China;Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China,Ministry of Education,Southwest Forestry University,Kunming,Yunnan 650224,China;Tree Breeding Station of Midu County Forestry Bureau,Midu,Yunnan 675600,China;Institute of Tropical and Subtropical Cash Crops,Yunnan Academy of Agriculture Sciences,Baoshan,Yunnan 678000,China)

机构地区：[1]西南林业大学西南地区生物多样性保育国家林业局重点实验室,云南昆明650224 [2]西南林业大学西南山地森林资源保育与利用教育部重点实验室,云南昆明650224 [3]弥渡县林木良种培育站,云南弥渡675600 [4]云南省农业科学院热带亚热带经济作物研究所,云南保山678000

出　　处：《西北农林科技大学学报（自然科学版）》2023年第1期75-83,共9页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金项目(31760204,31860203);云南省万人计划青年拔尖人才项目(09901-80201441)。

摘　　要：【目的】研究平茬后云南松苗木的生物量分配特征及其相对生长关系,为综合分析其平茬后的补偿性生长提供理论基础。【方法】以1年生云南松容器苗为试验材料,设置重度平茬(平茬高度5 cm)、中度平茬(平茬高度10 cm)和轻度平茬(平茬高度15 cm)3个平茬高度处理,以不平茬作为对照,1年后采用全株收获法测定根(主根和侧根)、茎(主干、侧枝、萌条枝)、叶(母株针叶和萌条针叶)生物量,并计算各器官的生物量占比,比较分析各处理不同器官生物量分配的差异及平茬高度与各器官生物量间的相关性;采用异速生长方程分析各器官间生物量的相对生长关系。【结果】云南松苗木除重度平茬的叶生物量显著(P<0.05)小于对照外,其余不同平茬高度处理间根、茎、叶、地上部分和单株生物量均无显著差异(P>0.05);不同平茬高度处理间根、茎、叶生物量的再分配存在明显差异,表现为随着平茬高度的降低,根生物量更多地分配到主根,茎生物量更多分配到侧枝,叶生物量更多分配到母株针叶。从生物量占比来看,处理间根质比、叶质比存在明显差异,与对照相比,重度平茬可显著提高根质比、降低叶质比(P<0.05);随着平茬高度的降低,云南松苗木根质比(16.38%~23.52%)逐渐增加,叶质比(48.12%~40.94%)逐渐减小,茎质比(33.79%~35.54%)的变化较小。相关性分析表明,平茬高度与主根生物量、侧枝生物量呈显著负相关(P<0.05),与萌条枝生物量呈显著正相关,与萌条针叶生物量呈极显著正相关(P<0.01),即平茬高度的降低有利于主根生物量和侧枝生物量的积累,但会减少萌条枝和萌条针叶生物量。相对生长关系分析表明,重度平茬叶-单株生物量间和轻度平茬地上部分-单株生物量间为异速生长关系;其余的叶-茎、叶-根、茎-根、地上部分-根生物量等的相对生长关系均为等速生长。【结论】平茬通过影响�【Objective】This paper studied the biomass allocation patterns and relative growth relationships of Pinus yunnanensis Franch.seedlings after stumping to provide theoretical basis for the comprehensive analyses of compensation growth.【Method】In this study,one-year-old container seedlings of P.yunnanensis were selected for treatments with different stumping intensities of heavy,moderate and light(stumping heights were 5 cm,10 cm and 15 cm,respectively)and seedlings without stumping were used as control.After one year,the whole harvest method was used to determine biomass of root(main root and lateral root),stem(trunk,branch,sprout branch),and needle(mother plant needle and sprout needle).The biomass ratios of different organs were calculated and the distribution differences of different organs in different treatments were compared.The relationships between stumping height and biomass were analyzed,and the relative growth relationships were obtained using allometric growth equation.【Result】There were insignificant differences between root,stem,needle,aboveground and individual plant biomass of P.yunnanensis seedlings in different stumping heights except that needle biomass accumulation of heavy stumping was significantly less than that of the control(P<0.05).Biomass redistribution in root,stem and leaf for different stumping heights had significant differences.The root biomass allocation was prior to main root,stem biomass allocation was prior to branch,and needle biomass allocation was prior to sprout needle with the decrease of stumping height.There were significant differences among treatments in root biomass ratios and needle biomass ratios.Heavy stumping significantly increased root biomass ratio,while significantly reduced needle biomass ratio(P<0.05)compared with the control.With the decrease of stumping height,root biomass ratios of P.yunnanensis seedlings(16.38%-23.52%)increased gradually,needle biomass ratios(48.12%-40.94%)decreased,while stem biomass ratios(33.79%-35.54%)varied lightly.Correlat

关 键 词：云南松 平茬 生物量分配 森林培育 

分 类 号：S791.257[农业科学—林木遗传育种]