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喜旱莲子草叶片、细根功能性状对异质生境的响应OA北大核心CSTPCD

Responses of Leaf and Fine Root Functional Traits of Alternanthera philoxeroides to Heterogeneous Habitats

中文摘要英文摘要

叶片、细根功能性状对植物的入侵过程具有重要影响,探究植物叶片、细根功能性状间的差异和联系,阐明植物地上地下部分对异质生境的响应,对于理解生物入侵机制具有重要意义.以3种生境(旱生、湿生、水生)的喜旱莲子草(Alternanthera philoxeroides)为研究对象,应用野外调查的方法,测定其叶片、细根共20个功能性状指标,分析其在不同生境中的差异性及其相关性.结果表明:(1)3种生境下植物功能性状具有显著差异(P<0.05),其中旱生生境的叶鲜质量((1.12±0.14)g)、叶面积((4.80±0.57)cm2)、叶体积((1.12±0.16)cm3)最大;水生的叶长宽比(2.95±0.22)、根组织密度((4.14±0.52)g·cm-3)最大.(2)湿生叶片相对含水量变异系数最大(0.603),叶长宽比变异系数最小(0.057);旱生根分支数变异系数最大(0.453),水生根平均直径变异系数最小(0.065).(3)叶片性状之间、细根性状之间联系密切,根-叶性状间的联系较少.(4)旱生偏向于获取型策略(高投入-低收益),湿生、水生偏向于资源保守型策略(低投入-高收益).

Functional traits of the leaf and fine root play an important role in plant invasion.It was of great significance for understanding the biological invasion mechanism to investigate the differences and connections between the functional traits of leaf and fine root functional traits and to illustrate the responses of plants parts above and below ground to heterogeneous habitats.In this research,20 functional traits in leaves and fine roots of Alternanthera philoxeroides in three habitats(xeric,wet,and aquatic)were measured and their differences and correlations in different habitats were analyzed by field investigation methods.The results indicated that:(1)There were significant differences(P<0.05)in plant functional traits among the three habitats,with the largest differences in leaf fresh weight((1.12±0.14)g),leaf area((4.80±0.57)cm2),and leaf volume((1.12±0.16)cm3)in the xeric habitat,while the ratio of leaf length to width(2.95±0.22)and root tissue density((4.14±0.52)g·cm-3)in aquatic habitat,respectively.(2)A.philoxeroides had the highest coefficient of variation in leaf relative water content(0.603)in hydric habitat,while the lowest coefficient of variation for the ratio of leaf length to width(0.057).In addition,it had the highest coefficient of variation for root branch number(0.453)in xeric habitat and the lowest coefficient of variation for root average diameter(0.065).(3)Similar to leaf,fine root traits were closely related,but there were less related between root and leaf traits.(4)A.philoxeroides preferred the acquisitive strategy(high input-low return)in the xeric habitat,while it preferred the resource conservative strategy(low input-high return)in the wet and aquatic habitats.

江燕东;彭正东;徐琪;甘婉怡;黄柳菁

福建农林大学风景园林与艺术学院,福州 350002

生物学

喜旱莲子草功能性状入侵植物异质生境生态策略

Alternanthera philoxeroidesfunctional traitsinvasive plantheterogeneous habitatecological strategy

《植物研究》 2024 (003)

410-419 / 10

国家自然科学基金面上项目(32071578);福建省自然科学基金面上项目(2021J01133).

10.7525/j.issn.1673-5102.2024.03.010

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