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

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.