生态学报2018，Vol.38Issue(3)：1124-1133,10.DOI:10.5846/stxb201612022484
尾叶桉林下5种植物的耐阴性、生物量及其个体消长
Dynamics of shade tolerance, biomass, and individual growth of five understory plant species in Eucalyptus urophylla plantations
摘要
Abstract
In order to investigate the ecophysiological characteristics and growth adaptability of different understory plants in Eucalyptus urophylla plantations,five understory species with high economic and medicinal values,including Ilex asprella,Gardenia jasminoides,Melastoma candidum,Rhodomyrtus tomentosa,and Litsea cubeba,were selected to measure leaf characteristics,chlorophyll content,and photosynthetic light response curves.In addition,the dynamics of biomass and individual number were analyzed based on field sampling survey data in 2006 and 201 1.Comparative analysis and cluster analysis revealed that:(1) the leaf width,thickness and,area of M.candidum were the largest,whereas those of I.asprella were the smallest.Overall,the net photosynthetic rate of the selected understory plants increased with increasing light intensity.However,the net photosynthetic rate of L asprella and G.jasminoides increased more rapidly than that of M.candidum and L.cubeba,and reached the light saturation point more quickly.R.tomentosa,M.candidum,and L.cubeba had higher light saturation points than that of I.asprella and G.jasminoides.The selected understory plants could be classified into two groups in terms of shade-tolerance ability,based on hierarchical cluster analysis.I.asprella and G.jasminoides were assigned to the strong shade-tolerant group,whereas M.candidum,L.cubeba,and R.tomentosa were assigned to the low shade-tolerant group.(2) Biomass of the five selected understory species increased with stand age,but the range of increment varied.The greatest increase was observed in M.candidum (74 fold),followed by R.tomentosa (18 fold),and the least was observed in L.cubeba (1.3 fold).The increase in biomass of M.candidum,R.tomentosa,and L.cubeba was mainly caused by the increase in individual height and basal diameter,whereas the increase in biomass of I.asprella and G.jasminoides was mainly attributed to the increase in individual number,height,and basal diameter.(3) I.asprella,a shade-tolerant understory species with high economic value,dominated the shrub community with increasing stand age of the Eucalyptus plantations,mainly owing to the increase in density,individual height,and basal diameter.G.jasminoides showed lower dominance over the shrub community owing to lesser increase in individual height and basal diameter than those of I.asprella.The density of L.cubeba,R.tomentosa,and M.candidum showed an overall decline with minor increase in individual height,basal diameter,and biomass.L.cubeba,R.tomentosa,and M.candidum can only survive in forest gap and edge owing to light limitation.In conclusion,we suggested that L asprella and G.jasminoides should be protected and re-introduced during Eucalyptus plantation management for biodiversity conservation.Under the short-rotation management regime,M.candidum,L.cubeba,and R.tomentosa should be retained and re-introduced in the forest gap and edge.关键词
尾叶桉林/林下植物/光合特性/叶片特征/生物量Key words
Eucalyptus plantations/understory plant/photosynthetic characteristics/leaf trait/biomass引用本文复制引用
公绪云,饶兴权,周丽霞,王晓玲,朱小林,蔡锡安..尾叶桉林下5种植物的耐阴性、生物量及其个体消长[J].生态学报,2018,38(3):1124-1133,10.基金项目
广东省林业科技创新项目(2014KJCX019-03,2017KJCX021) （2014KJCX019-03,2017KJCX021）
中国科学院科技服务网络计划(STS)项目(KFJ-SW-STS-147-3) （STS）
