摘要
【目的】云南松后代个体分化强烈,苗期生长缓慢,严重影响了云南松良种化进程。研究不同等级云南松幼苗生物量投资与分配及其异速生长,以期深入了解分化个体大小对云南松幼苗生物量分配在适应对策方面的影响。【方法】对同一种源425株3 a生云南松苗木的生长及生物量相关指标进行测定,采用单因素方差分析法比较不同等级云南松苗木的生物量投资与分配差异,并运用标准化主轴分析法对其异速生长关系进行分析。【结果】不同等级苗木间生物量的投资与分配存在差异,各构件间生物量的投资表现为叶>茎>根。等级越低的苗木生物量投资越少且分化越明显,但根生物量分配越多;随着等级的升高,苗木分配更多的生物量给地上部分。不同等级云南松苗木各构件之间以及各构件与单株之间均存在显著或极显著的异速或等速生长关系,根-叶、茎-叶、非光合器官-叶之间的异速生长指数在不同等级苗木间均存在显著差异,随着个体的增大,茎、叶以及非光合器官分别与单株生物量的异速生长轨迹均发生了显著改变,无共同SMA斜率。不同等级苗木的苗高与地径、单株、根冠比以及地径与单株、根冠比间总体上表现出显著或极显著的异速生长关系,形态指标的生长速率小于地下部分生物量以及单株生物量的积累速率。【结论】云南松幼苗在不同等级间分配模式并未表现出相同的变化规律,等级较高的云南松苗采取提高资源利用效率为主的适应策略,而等级较低的云南松苗采取提高存活率为主的生存策略,相应的各构件通过加速生长来平衡生物量的分配。
【Objective】The individual differentiation of Pinus yunnanensis was strong during seedling period,and the phenomenon of slow growth was obvious,which seriously prevented the process of improved varieties of P.yunnanensis.The biomass investment,distribution and allometric growth of P.yunnanensis seedlings with different levels were studied in order to deeply understand the effect of individual size on adaptation strategies derived from the biomass allocation of P.yunnanensis seedlings.【Method】The growth and biomass traits of 425 P.yunnanensis seedings around 3-years-old from the same provenance were investigated.One-way ANOVA was used to compare the differences in biomass investment and allocation of seedlings at different seedling levels,and the allometric growth was analyzed by adopting standardized major axis(SMA)analyses.【Result】The biomass investment and allocation were different for seedlings at different levels.The biomass investment in each component was ordered by leaf>stem>root.The lower level the seedlings,the less biomass the investment,and the more obvious the differentiation,but the more biomass was allocated in root.With the increase of seedling level,the aboveground part biomass increased.There were significant or extremely significant allometric or isokinetic growth relationships among the components of P.yunnanensis seedlings at different levels,as well as the correlation between the components and individual plant.The allometric growth indexes of root-leaf,stem-leaf and non-photosynthetic organ-leaf were significantly different among different seedling levels.With the individual size increasing,the allometric growth characters between stem,leaf or non-photosynthetic organs and individual biomass changed significantly,with different SMA slopes.There were significant or extremely significant allometric relationships between seedling height and ground diameter,individual plant,root-shoot ratio,and between diameter and individual plant,ground diameter and root-shoot ratio of different see
作者
陈诗
陈林
唐军荣
蔡年辉
许玉兰
黄键
CHEN Shi;CHEN Lin;TANG Junrong;CAI Nianhui;XU Yulan;HUANG Jian(Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China,Southwest Forestry University,Kunming 650224,China;Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Southwest Forestry University,Ministry of Education,Kunming 650224,China;Yunnan General Administration of Forestry Seeds and Seedlings,Kunming 650215,China)
出处
《四川农业大学学报》
CSCD
北大核心
2023年第2期209-216,256,共9页
Journal of Sichuan Agricultural University
基金
云南省万人计划青年拔尖人才项目(09901-80201441)
国家自然科学基金项目(31860203)
西南林业大学科技处科研预研基金项目(01108-110822091)
云南省研究生导师团队建设项目(2022-97)
校科研基金(01108-18200133)。
关键词
云南松
等级
生物量分配
异速生长
Pinus yunnanensis
classes
biomass allocation
allometry
