深圳湾红树林自然保护区乡土红树老鼠簕扩散动态与生长策略研究OA

Through permanent plot-based ecological monitoring of five representative mangrove communities(Kandelia obovata-Aegiceras corniculatum community,K.obovata community,K.obovata-Avicennia marina com-munity,A.marina community,and artificial forest)in the Mangrove Nature Reserve of Shenzhen Bay,combined with measurements of leaf functional traits and sediment physicochemical parameters,this study elucidates the po-pulation distribution pattern,asexual reproduction dynamics and ecological strategies of the understory A.ilicifolius population under the background of terrestrialization.The results show that A.ilicifolius has become the domi-nant understory species(importance value:85.38%),with an aggregated distribution pattern(K<0)and a uniform distribution(PAI=1,C<1).The population density of mature individuals showes slow expansion(1991-2011),rapid growth(2011-2019:0.03→16.84±13.11 plants/m2),and stabilization by 2023(17.26±7.03 plants/m2).Clonal rep-roduction is one of the key strategies for the A.ilicifolius population to dispersal.A.ilicifolius exhibits stolo-niferous clonal growth with guerrilla architecture,characterized by a mean spacer length(41.26±32.92 cm)and monthly elongation rate(1.29±0.66 cm/month),reflecting an expansion-growth(escape strategy)under low-light understory habitats.High-sedimentation zones trigger an ecological strategy shift from CS to C or CR,manifested by increased canopy height and long-spacer stolon extension.This study provides early-warning data for mangrove ecological risks.