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Accueil du site → Doctorat → Chine → 2018 → Effect of Exotic Introduced Plants Azadirachta Indica and Moringa Oleifera on Pollination Network of Dry-hot Valley in Honghe Area

China Forestry Science Academe (2018)

Effect of Exotic Introduced Plants Azadirachta Indica and Moringa Oleifera on Pollination Network of Dry-hot Valley in Honghe Area

起国海;

Titre : Effect of Exotic Introduced Plants Azadirachta Indica and Moringa Oleifera on Pollination Network of Dry-hot Valley in Honghe Area

Auteur : 起国海;

Grade : Doctoral Dissertation 2018

Université : China Forestry Science Academe

Résumé
Dry-hot valley is area with low plant-cover and fragile ecological environment,but plant yield of seeds and fruit could be great due to richness of sunshine and heat under circumstance of enough water supplies.Thus,agro-forestry scale has been quickly developed by cultivation of Azadirachta indica and Moringa oleifera in valley areas of Honghe River,Yunnan Province,which have been introduced to the areas for a decade as multipurpose trees.But the flowering period of A.indica and M.oleifera is overlapping with some local plants,which are,Litchi chinensis,Mangifera indica,Capparis wui,Capparis chingiana,and Phyllanthus emblica.Moreover,all of these domesticated and protogenesis plants rely on generalized pollinators.Thus,pollination interference between introduced plant and local protogenesis plant need to be confirmed.Based on research work of pollinating and breeding systems,the extent of local generalized pollinators supporting on introduced plants and the influence on pollination of protogenesis plants could be showed,which is concerned with environmental protection.It could also provide the basic information of formation and maintenance of pollination network for further setting of plant community,improving output of agroforestry system,and benefitting the understanding of plant-pollinator interaction in terrestrial ecosystem,and giving advice to conservation of pollination insects,and also to the strategy and management of domesticated plants blending in local pollination network.The results are as follows:1 Azadirachta indica and.Moringa oleifera were merging into local pollination network,and already set up connections to local pollinators in three aspects :(1)Within the network of 7 plant species and 31 insects,61 connections were observed.In which 20 connections(32.7%)were between domesticated trees and pollinators.(2)The highest number of connections was 13,between A.indica and insects.And the number of connections between M.oleifera and insects was 7,which was more than C.wui and P.emblica.(3)Compared with decade-ago,pollinator species of M.oleifera and A.indica increased 2 and 4 respectively,and frequency increased by 5.4 and 1.7 times respectively.These three aspects showed the evidence of merging into local network.Nested structure of the pollination network showed that there was overlap of pollinators among the exotics plant A.indica and M.oleifera,native plants L.chinensis and M.indica,the protophyte plants C.wui,C.chingiana and P.emblica and the pollinators competition was mainly between exotic plants and native plants.2.According to comparing species and visiting frequency of insects among the 7 plants,the major pollinators of A.indica,M.oleifera,L.chinensis and M.indica were bees.And the major pollinators of C.wui,C.chingiana and P.emblica were butterflies and moths.Thus,pollen interference was mainly occurred between the former 4 tree species.

Mots clés : Azadirachta indica; Moringa oleifera; Pollination network; Floral scent; Pollen interference; Fruit-set rate;

Présentation (CNKI)

Page publiée le 11 avril 2019