Invasion Mechanism of Spartina alterniflora in Minjiang River Estuarine Wetland
To clarify the mechanism of plant invasion,based on field investigation and laboratory analysis,taking Minjiang River estuarine wetland as a case,root-shoot ratio,nutrient distribution and nutrient ecological stoichiometry were measured and analyzed.The results showed that seasonal root-shoot ratio of Spartina alterniflora was 0.49-1.64 and the averaged value was 1.11,which was lower than that of native Cyperus malaccensis var.brevifolius（root-shoot ratio was 3.11-7.95 and the averaged value was 5.29）.Seasonal averaged nutrient distribution to root,stem and leaf followed the order of leafrootstem for Spartina alterniflora,but leafstemroot for Cyperus malaccensis var.brevifolius.Spartina alterniflora leaf and stem seasonal averaged C/N and C/P were higher than Cyperus malaccensis var.brevifolius,and the root C/N and C/P were lower,Spartina alterniflora leaf,stem and root seasonal averaged N/P were higher than Cyperus malaccensis var.brevifolius.Successful invasion of Spartina alterniflora was caused by higher allocation of aboveground biomass,assimilation organ（leaf） and reproduction organ（root） nutrients,as well as higher C/N,C/P and N/P ratios.
invasive speciesnative speciesecological stoichiometrywetlandMinjiang River estuary
NETL
NSTL
万方数据
维普
