云南松苗木根系可塑性对平茬高度的响应  

Response of root plasticity of Pinus yunnanensis seedlings to stumping height

作　　者：蔡年辉[1,2] 唐军荣[1] 李亚麒 陈诗[1,2] 陈林 许玉兰[1,2] 李根前[2] CAI Nian-hui;TANG Jun-rong;LI Ya-qi;CHEN Shi;CHEN Lin;XU Yu-lan;LI Gen-qian(Key Laboratory of Biodiversity Conservation in Southwest China,State Forestry Administration,Southwest Forestry University,Kunming 650224,Yunnan,China;Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Southwest Forestry University,Ministry of Education,Kunming 650224,Yunnan,China;Institute of Tropical and Subtropical Cash Crops,Yunnan Academy of Agriculture Sciences,Baoshan 678000,Yunnan,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]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：《云南大学学报（自然科学版）》2022年第6期1305-1313,共9页Journal of Yunnan University(Natural Sciences Edition)

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

摘　　要：为反映云南松苗木根系对平茬高度的响应,以1年生播种苗为材料,采用盆栽试验,设置3个平茬高度(分别是5、10 cm和15 cm),以不平茬为对照,测定云南松苗木根系形态及其生物量,分析平茬高度对云南松苗木根系的影响.结果表明,除平均直径和主根生物量/侧根生物量外,其它根系形态指标均表现为平茬处理高于对照,即平茬可促进根系生长.随平茬高度的降低,总根长、表面积、总体积和侧根生物量呈下降趋势;主根长、平均直径、主根生物量和根冠比呈上升趋势;根生物量为先上升后下降.平茬降低根系形态和生物量的变异系数,随平茬高度的降低变异系数下降.苗木根系形态及其生物量各指标间均有不同程度的相关性,表明它们之间相互影响.平茬对苗木侧根生物量−主根生物量、地上部分生物量−根生物量、根生物量−单株生物量间异速生长关系的影响较小.随平茬高度的降低,地上部分生物量的积累逐渐减慢,生长资源向地下部分转移,地下部分优先向主根投资,主根长与主根生物量均增加,以此来适应平茬后植株的生长需求.The 1-year-old seedlings were used as the research materials to disclose the response of root morphology of Pinus yunnanensis seedlings to stumping heights in this study.The study was conducted by pot experiment in greenhouse and three stumping heights(5,10 cm and 15 cm)with control were set up.After one growth season root morphological characteristics and biomass of P.yunnanensis seedlings were measured and analyzed.The results showed that,except for the average diameter and the ratio of main root biomass to lateral root biomass,other root morphological indicators in the stumping treatment were higher than those in the control,that is,the stumping can promote root growth.There were different responses on stumping heights for different root morphological characteristics and biomass indexes.The total root length,surface area,total root volume and lateral root biomass decreased with the decreasing of stumping height.The major root length,average diameter,major root biomass and the ratio of root biomass to aboveground biomass increased with the decreasing of stumping height.The root biomass first increased and then decreased with the decreasing of stumping height.Based on the coefficient of variation of the measured indexes,stumping treatments decreased when compared with control.Except for control,the coefficient of variation for those indexes increased with the decrease of stumping height.Correlation analyses showed that the indexes were interacted with each other.Further analyses showed that the stumping changed lightly allometric growth relationship between the aboveground biomass and root biomass,lateral root biomass and major root biomass,root biomass and individual biomass.In conclusion,growth resources were shifted to the underground part after stumping,that is,the aboveground biomass accumulation decreased with the decreasing of stumping height.For the redistribution of the underground part biomass,the major root was invested preferentially,and major root length and major root biomass increased to adapt to

关 键 词：云南松 平茬 根系可塑性 异速生长 

分 类 号：S723.1[农业科学—林木遗传育种]