Effects of thinning and pruning on native mangrove plants in understory of Laguncularia racemosa forest
In order to investigate a new way to replace the exotic mangrove Laguncularia racemosa plantations gradually with native mangrove forests through thinning and pruning without clear-cutting of drastic habitat disturbance in the reserve,we took the exotic mangrove L.racemosa forests introduced in Hainan Dongzhai Harbor National Nature Reserve as the study area,and L.racemosa forests were thinning and pruning relying on the reserve.The purpose was to study the ecological effects of the thinning and pruning of L.racemosa forests on the restoration of native mangrove communities.The results were as follows:(1)Asexual reproduction of L.racemosa stump sprouting after thinning and pruning weakened the treatment effect,and there was no significant difference in the effects of L.racemosa stump sprouting between one intervention(50%intensity of thinning and pruning)and two interventions(50%intensity of thinning and pruning followed by an additional pruning).(2)Both intervention methods enriched native mangrove species and promoted their growth in the understory shrub layer,and the two interventions had a more significant promotion effect than the one intervention.However,there was no significant effect on the natural regeneration of mangrove seedlings in the herbaceous layer.(3)In the experiment of planting native mangrove seedlings in the three plots of non-thinning,thinning and pruning,and forest margin,the survival rates of Rhizophora stylosa and Kandelia obovata seedlings were promoted by the thinning and pruning.The effect of thinning and pruning on the growth of Rhizophora stylosa seedlings was close to the forest margin conditions,but the effect was limited.In conclusion,we suggest increasing the thinning intensity or pruning frequency based on 50%intensity thinning and pruning,carrying out artificial planting of native mangrove plants in the understory appropriately,and removing the sprouting branches from the stumps of Laguncularia racemosa,which is more conducive to the conversion of L.racemosa plantation to native mangrove community.
exotic mangroveLaguncularia racemosathinning and pruningnative mangroveecological restoration
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