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Impact of invasive ageratina adenophora on relative performance of woody vegetation in different forest ecosystems of Kumaun Himalaya,India

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Journal of Mountain Science 2023年第9期20卷 2557-2579页

作者： Bhawna NEGI Kavita KHATRI Surendra S.BARGALI Kiran BARGALI Archana FARTYAL R.K.CHATURVEDI Department of Botany D.S.B CampusKumaun UniversityNainital-263002UttarakhandIndia Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China

Invasive plant ageratina adenophora(Sprengel)R.King&H.Robinson has invaded majority of the temperate forests in Kumaun,Central Himalaya.Information on A.adenophora invaded forest types,their structural attributes,population demography and regeneration status are still at rudimentary level.Considering this,the present study was conducted to assess the impacts of A.adenophora on vegetational attributes and regeneration status of three forest types,viz.,Oak(Quercus oblongata D.Don),Pine(Pinus roxburghii Sarg.)and Cypress(Cupressus torulosa D.Don).We selected three sites for each forest type and each site was further purposively stratified into paired sampling plots of 1 ha each i.e.,A.adenophora invaded and uninvaded sites.Our results showed large densities of cut stumps or felled trees throughout invaded sites,but with fewer fire signs in comparison to uninvaded sites.In uninvaded sites,total density and basal area calculated for woody species were relatively higher than those in invaded sites,although results were insignificant(p>0.05).With the exception for Cypress forests,vegetation indices showed low woody species richness and diversity in invaded Oak and Pine forests.Also,regeneration of Q.oblongata,P.roxburghii and C.torulosa tree species did not differ significantly(p>0.05)between invaded and uninvaded sites.These insignificant differences clearly imply that A.adenophora's presence has not entirely changed the perennial plant communities in terms of composition,structure and natural regeneration.However,tree species with poor or no regeneration status requires special attention and needs management strategies involving control of invasive species in forest ecosystems.

关键词： ageratina adenophora Seedling density Forests Population structure Regeneration

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Inhibition of ageratina adenophora on Spore Germination and Gametophyte Development of Macrothelypteris torresiana

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Journal of Integrative Plant Biology 2008年第5期50卷 559-564页

作者： Kai-Mei Zhang Lei Shi Chuang-Dao Jiang Zhen-Yu Li Institute of Botany the Chinese Academy of Sciences Beijing 100093 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Allelopathy of ageratina adenophora plays an important role in its invasion. However, we have little knowledge of its allelpathic effects on ferns. In Petri dish bioassays, the inhibitory potential of aqueous leachates from roots, stems and leaves of A. adenophora was studied on the spore germination and gametophyte development of Macrothelypteris torresiana. All leachatss inhibited the spore germination and growth of the first rhizoid of M. torresiana and inhibitory effects increased with increasing leachate concentrations. Root leachates proved most inhibitory. Gametophyte rhizoids of M. torresiana treated with stem and leaf leachates of A. adenophora were erect, which was similar to those of the control. However, gametophyte rhizoids of M. torresiana treated with root leachates of A. adenophora were erect, but also curving or swollen. Moreover, curving and swollen rhizoids increased with increasing concentrations. As time went by, rhizoids treated with root leachates were not so curved and the swelling almost disappeared. Possible causes are discussed in the present study. The increasing concentrations of leaf leachates also delayed the stages of gametophyte development. With the treatment of root leachates, the delay was more obvious. Thus A. adenophora inhibited the spore germination and gametophyte development of M. torresiana and the root leachates were most inhibitory.

关键词： ageratina adenophora allelopathy gametophyte development invasion Macrothelypte#s torresiana spore germination.

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Beneficial rhizobacterium provides positive plant–soil feedback effects to ageratina adenophora

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Journal of Integrative Agriculture 2021年第5期20卷 1327-1335页

作者： SUN Yuan-yuan ZHANG Qiu-xin ZHAO Yun-peng DIAO Yue-hui GUI Fu-rong YANG Guo-qing College of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009P.R.China College of Plant Protection Yunnan Agricultural UniversityKunming 650201P.R.China

Rhizosphere microbial communities play important roles in facilitating or inhibiting the establishment of exotic species.Since some invasive plants interact with soil microbial communities such as rhizosphere bacteria,changes triggered by rhizosphere bacteria may alter competitive interactions between exotic and native plants.This study compared the Bacillus cereus content in soils with different degrees of ageratina adenophora invasion,and investigated the effects of A.adenophora allelochemicals on B.cereus growth and soil characteristics and the feedback effects of B.cereus on A.adenophora growth.Bacillus cereus content in the rhizosphere of A.adenophora increased with intensification of the invasion process,and newly invaded soil contained almost twice as much bacteria as noninvaded soil.When rhizosphere soil was added to the root exudates of A.adenophora,the contents of B.cereus were twice as much as the control,except on the first day.Certain soil parameters increased significantly,such as ammonium nitrogen(NH_(4)^(+)-N)and available phosphorus(AP),which were increased by 41 and 27%,respectively.Soil treatment with B.cereus promoted the degradation of two allelochemicals from the rhizosphere of A.adenophora,amorpha-4,7(11)-dien-8-one and 6-hydroxy-5-isopropy1-3,8-dimethyl-4 a,5,6,7,8,8 ahexahydraphthalen-2(1 H)-one,to varying degrees;and increased the germination rate by 50%,root length by 117%,shoot length by 48%and fresh weight by 81%for A.adenophora compared to those of untreated soil.Our results confirmed that the invasion of A.adenophora will promote an increase of B.cereus,a beneficial rhizosphere bacterium,which in turn induces a positive feedback effect on A.adenophora.

关键词： ageratina adenophora Bacillus cereus feedback allelochemicals root exudates

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Lack of local adaptation of invasive crofton weed(ageratina adenophora)in different climatic areas of Yunnan Province,China

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Journal of Plant Ecology 2013年第4期6卷 316-322页

作者： Xiangjian Zhao Wenyao Liu Meng Zhou Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China Graduate University of Chinese Academy of Sciences Beijing100093China School of Environmental Biology Curtin University of TechnologyPerthWA 6845Australia

Aims Crofton weed,with a subtropical origin,has successfully invaded in diverse habitats that belong to different climate zones in southwest China.We tested whether local adaptation plays an important role in the successful invasion of crofton weed in heterogeneous environments.Methods Five populations from different habitats with an altitude ranging from 678 to 2356 m were selected.Plant height,biomass,seed yield and seed germination capability of these populations were investigated in the field.greenhouse and reciprocal transplant experiments with the five populations were conducted,and all the above characters were measured and compared among these populations.Important Findings Plant height,biomass,seed yield and seed germination rate were each significantly different among the five populations in field.However,there was no difference among these populations in the greenhouse experiment.In the reciprocal transplant experiment,plants from the five populations responded similarly to different habitats in the field,indicat-ing lack of local adaptation.Instead,phenotypic plasticity likely plays a key role in the invasion success of crofton weed in different habitats.

关键词： ageratina adenophora local adaptation phenotypic plasticity invasion

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Growth disturbance of aqueous extracts from several crops straw (residue) on ageratina adenophora:A study based on laboratory biological simulation experiment

Growth disturbance of aqueous extracts from several crops st...

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中国第六届植物化感作用学术研讨会

作者： YU Fu-ke HE Yong HUANG Xin-hui MA Yong-qing Institute of Environmental Sciences and Ecological Restoration School of Life SciencesYunnan University College of Environmental Science and Engineering Southwest Forestry University Institute of Soil and Water Conservation Chinese Academy of Sciences & Ministry of Water Resources

Laboratory biological simulation experiment was conducted to investigate growth disturbance of high,moderate,low concentration of aqueous extracts (e.***.the original extracts with a solid-liquid ratio of 1:40 g·mL-1 and its 5 times diluents and 25 times diluents) from several crops straw (residue) on ageratina adenophora,a worldwide notorious invasive weed.The results showed:(a) high concentration of aqueous extracts from Brassica oleracea waste leaves and high,moderate,low concentration of aqueous extracts from Oryza sativa straw and Triticum aestivum straw showed rather strong synthetic effects (inhibition) on germination rate (GR) and germination index (GI) of A.adenophora,which could be chosen for the control over the seeds germination of A.adenophora;(b) high and moderate concentrations of aqueous extracts from Vicia cracca straw,high concentration of aqueous extracts from B.campestris waste leaves and moderate and low concentrations of aqueous extracts from O.sativa straw and T.aestivum straw showed rather strong synthetic effects (inhibition) on radicle length (RL) and hypocotyl length (HL) of A.adenophora,which could be selected as ideal materials for the control over the seedlings growth of A.adenophora.(c) high concentrations of aqueous extracts from V.cracca straw,B.oleracea waste leaves and B.campestris waste leaves,and high,moderate,low concentrations of aqueous extracts from O.sativa straw and T.aestivum straw showed rather strong synthetic effects (inhibition) on GR,GI,RL and HL of A.adenophora,which could be selected as ideal materials for the control over the seeds germination and seedlings growth of A.adenophora.Thus,this study would provide a theoretic guidance and technical support for the utilization and recycling of crops straw (residue) and the prevention and control over invasive weeds as well.

关键词： crop straw （residue） ageratina adenophora growth disturbance biological simulation.

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Experimental Study on Inhibition Effects of Acacia mearnsii Extract on ageratina adenophora

Experimental Study on Inhibition Effects of Acacia mearnsii ...

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中国第六届植物化感作用学术研讨会

作者： HE Yong YU Fu-ke Department of Environmental Science and Engineering Southwest Forestry University Institute of Environmental Sciences and Ecological Restoration School of Life SciencesYunnan University

[Objective] The study aimed to discuss the allelopathic effect from Acacia mearnsii water extract to ageratina adenophora seed germination and seedling growth.[Method] From the perspective of plant allelopathy,by using indoor biological simulation experiment,we assayed the interference effect of water extract in different concentrations (1X、5X、10X、15X) from Acacia mearnsii leaves on ageratina adenophora seed germination and seedling growth,so as to confirm the inhibition effects of Acacia mearnsii extract.[Result] Different concentrations (1X、5X、10X、15X) of water extract from Acacia mearnsii leaves all have inhibitory effect on ageratina adenophora seed germination and seedling growth,and the inhibitory effect on every parameter (Germination rate,Germination index,Radicle length,Hypocotyls length) receded along with the increase of water extract dilution ratio.Thereinto,RI of inhibition effects on seed germination rate ranged from-0.045 to-0.206,RI of seed germination index ranged from-0.109 to-0.499,RI of radicle length ranged from-0.176 to 0.004,RI of hypocotyls length ranged from-0.031 to-0.112,the inhibition effect of every parameter is especially obvious treated with 1X water extract.[Conclusion] The research confirmed the Acacia mearnsii water extract had the inhibition effect on ageratina adenophora,and the result can provide some reference to biological control of ageratina adenophora.

关键词： Acacia mearnsii water extract ageratina adenophora allelopathy

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Multiple factors relating to the rapid expansion of an invasive plant species ageratina adenophora

Multiple factors relating to the rapid expansion of an invas...

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第三届全国生物入侵大会

作者： Rui Wang~1,Yin-zheng Wang~2,Fang-hao Wan~1 1.State Key Laboratory for Biology of Plant Diseases and Insect Pests,Institute of Plant Protection, Chinese Academy of Agricultural Sciences,Beijing,100094,China 2.State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing,100093,China

Many ecological and social factors have influenced the rapid invasion and spread of ageratina. adenophora into the eastern Himalayas,with its heterogeneous natural environment.We focused on how diverse biological traits may couple with spatiotemporally heterogeneous geography and ecology, and promote rapid invasion.Spatial and temporal distribution data were collected from literature and private and public collections.We mapped the spatial and temporal distribution of A.adenophora in the Hengduan Mountains,then used binary logistic regression to identify variables that contribute to its spread.Join-count statistics were used to analyze geographic patterns.Our analyses reveal that water, wind,elevation,and human activities significantly affect the distribution of A.adenophora along the Yalongjiang River,Jinshajiang-Yangtze River,Anninghe River,G108 national road and rail line. Invasion occurs in a compact or scattered manner depending on dispersal pathway and times. Biological traits favor dispersal by water and wind.Human activities along roads and rail lines facilitate invasion over high mountains and across river valleys,and provide scope for further natural dispersal.An unexpected and rare invasion event resulted from a great flood;this amplified the dispersal ability of this plant both from vegetative propagules and seed production.

关键词： ageratina adenophora Invasion Dispersal Hengduan Mountains Yangtze River

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Competition effect of Cogon grass,Imperata cylindrica to Crofton weed,ageratina adenophora

Competition effect of Cogon grass,Imperata cylindrica to Cro...

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第三届全国生物入侵大会

作者： Fu-rong Gui~1,Zheng-yue Li~1,Fang-hao Wan~(2*) 1.College of Plant Protection,Yunnan Agricultural University,Kunming 650201,China 2.Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100081,China

Invasive alien species are the most important indicators of environmental change worldwide;it may cause environmental degradation,biodiversity loss,food and water shortage,and high possibility and severity of natural disasters.Interest in management of invasive species has grown rapidly in the recent years,and it is a good way to replace invaded plant by utilizing valuable native species.The competition effects between the native Gramineous plant,Cogon grass,Imperata cylindrical and the invasive Compositae plant,Crofton weed,ageratina adenophora were analyzed in the present study to provide basis for control of this invasive plant The results showed that,there was significant mutual antagonism between I.cylindrical and A.adenophora.The relative competitive ability of I.cylindrical was higher than that of A.adenophora,which heavily suppressed the growth of A.adenophora by shoot competition.Compared to A.adenophora,the seedlings of I.cylindrical were germinated faster, and its plant height and average leaf area were higher.Mixed culture with I.cylindrical may restrain growth and tillering of A.adenophora,and the plant height,average leaf area and chlorophyll content were 49%,72%and 77%of those in monoculture,respectively.Whereas there no significant influence on I.cylindrical for mixed culture with A.adenophora,furthermore,the tillering of I.cylindrical can be promoted.The relative yield(RY) of I.cylindrical was significantly higher than those of A. adenophora,and the relative yield total(RYT) was significantly lower than 1.0.The relationships mentioned above may become more obvious with the prolonged time of mixed culturing.

关键词： ageratina adenophora Imperata cylindrical Relative yield Competition effect Replacement control

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Invasive effects of ageratina adenophora Sprengelon soil microbial community and soil enzyme and physical and chemical properties

Invasive effects of Ageratina adenophora Sprengelon soil mic...

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第二届全国生物入侵学术研讨会

作者： LI Hui-Na~(1,2),LIU Wan-Xue~2,WAN Fang-Hao~(2*),CAO Yuan-Yin~1 (1 College of Plant Protection of Shenyang Agriculture University,Shenyang 110161 2 Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100081)

To explore the effects of ageratina adenophora Sprengel(Asteraceae) on soil ecology,soil microbial communities were analyzed using PCR-DGGE,the activities of 3 enzymes and 8 soil physical and chemical factors were measured following A adenophora invasion.Compared to non-invaded site and native plant site,invasion of A.adenophora modified soil microbial community composition.It was most noticeable that A.adenophora increased soil organic carbon,NO3-N, NH4-N,available P,available K content and the activities of urase,neutral phosphatase,alkaline phosphatase and invertase.The quantity of soil fungi,azotobacteria,ammonia oxidizing bacteria were most abundant in heavily invaded site.Soil azotobacteria,ammonia oxidizing bacteria and urase, phosphatase were significantly associated with most of the measured soil physical and chemical properties.We examined bacterial community composition in soil following ageratina adenophora invasion in China using PCR-DGGE method which can detect variation of microbial gene diversity in environments.The results of DGGE bands showed that A.adenophora had changed the soil bacterial communities,especially the soil nutrition cycling and soil enzyme related soil microbe groups, probably creating favorable soil environment to benefit itself.The invasion-induced changes of soil microbial community and physical and chemical properties may be used by A.adenophora to expand rapidly in invasive ranges.

关键词： ageratina adenophora exotic plant activity of soil enzyme soil physical and chemical properties soil microbial community

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Antifungal activities and phytochemical screening of two invasive alien species of Nepal

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Studies in Fungi 2018年第1期3卷 293-301页

作者： Das RK Devkota A R.R.M.Campus Janakpur DhamTribhuvan University Central Department of Botany Tibhuvan UniversityKathmanduNepal

The antifungal activities and phytochemical screening of two invasive alien species:ageratina adenophora and Ipomoea carnea ssp.fistulosa of Nepal were studied.Distilled water and methanolic extract of the leaves of plants were tested against five phytopathogenic fungi viz.Alternaria brassicae,Botrytis cinerea,Fusarium oxysporum,Phytophthora capsici and Sclerotium rolfsii at five different concentrations(50 mg/ml,100 mg/ml,150 mg/ml,200 mg/ml,250 mg/ml).The antifungal activity was performed by poisoned food technique;and linear mycelium growth reduction(LMGR)percentage was calculated.A qualitative phytochemical screening was performed for constituents such as tannins,saponins,terpenoids,alkaloids and flavonoids.The methanolic extract was more efficient as compared to the distilled water extract.A.brassicae,B.cinerea and S.rolfsii were found the most resistant fungi and F.oxysporum was found the most susceptible fungus.Out of two plants,A.adenophora was found more active against selected pathogens than Ipomoea carnea ssp.fistulosa.It can be concluded that the tested plants possess antifungal properties which may be used as alternative fungicides after further investigation.

关键词： ageratina adenophora Ipomoea carnea ssp.Fistulosa LMGR Plant extracts

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