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Dissertations / Theses on the topic 'Weed diversity'

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1

Green, Jennifer. "Genetic diversity in annual weed species at different spatial scales." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394431.

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2

Osburn, Andrew Wesley. "Understanding Weed Species Diversity in Railroad Crossing Rights-of-way." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574641066802878.

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3

Smith, Victoria Clare. "Invertebrate response to weed diversity and spatial arrangement within arable fields." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494233.

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Weeds play a vital role in supporting arable biodiversity by providing both food and shelter to invertebrates and their predators. A better understanding of the relationship between weeds and invertebrates will form a necessary first step towards balancing the needs of both weed control and biodiversity in order to achieve a more sustainable system of crop production. Analysis of data from the FSEs (Farm Scale Evaluations) showed that no standard composition of weeds or invertebrates exists across all arable fields. Both weed and invertebrate species compositions varied according to the crop s
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4

Sosnoskie, Lynn Marie. "Investigations in weed biology studies at the plant, population, and community levels /." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1102976937.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xx, 147 p.; also includes graphics (some col.) Includes bibliographical references (p. 137-147).
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5

Park, Kee Choon. "Enzymatic activity, microbial diversity, and weed seed banks in soils receiving different organic amendments and the biological fertilizer EM(tm) /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3164535.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2004.<br>(tm) after EM in title is for Trademark symbol. Typescript. Vita. Includes bibliographical references (leaves 120-142). Also available on the Internet.
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6

Von, Senger Inge. "An assessment of the genetic diversity and origin of the invasive weed Chromolaena Odorata (L.) King and Robinson in South Africa." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1003802.

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Chromolaena odorata (L.) King and Robinson is an alien invasive weed to most of the Old World tropical regions of the earth, including South Africa where it is morphologically distinct from most other C. odorata plants examined from both its native and invasive range. It is thought that these morphological differences are related to difficulties encountered in successful establishment of biological control agents on the South African population of C. odorata. It has been postulated that the source population of the South African population will harbour potential biocontrol agents that will be
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7

Armengot, Martínez Laura. "La flora arvense dels conreus cerealístics de secà: efectes de la intensificació agrícola - Weed diversity of dryland cereal fields: effects of agricultural intensification." Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/32110.

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La intensificació agrícola que s'ha produït al llarg de les darreres dècades ha fet possible un augment de la producció. Aquesta intensificació, però, ha ocasionat greus conseqüències pel medi, entre les que destaca, la pèrdua de biodiversitat. La pèrdua de diversitat d'espècies arvenses és un dels problemes més rellevants perquè tenen un paper clau en el funcionament dels sistemes agrícoles. La intensificació agrícola s’ha produït a diferents escales espacials. A escala de paisatge, l’agregació de parcel•les i la reducció dels hàbitats associats als conreus a causa de la concentració parcel•l
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8

Weidow, Elliot D. "Genetic Diversity in an Invasive Clonal Plant? A Historical and Contemporary Perspective." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2522.

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Introduced populations of Eichhornia crassipes (Pontederiaceae) possess extremely low levels of genetic diversity due to severe bottleneck events and clonal reproduction. While populations elsewhere have been well studied, North American populations of E. crassipes remain understudied. We used Amplified Fragment Length Polymorphism markers to assess genetic diversity and population structure in North American E. crassipes populations. Patterns of diversity over the past fifty years were analyzed using herbarium specimens. Furthermore, we sampled populations across the Gulf Coast of the United
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9

Caballero, López Berta. "La diversitat d'artròpodes als agro-ecosistemes: efectes del paisatge, la gestió agronòmica, i la composició de la flora arvense = Arthropod diversity in agro-ecosystems: the effects of landscape, management and assembly of weed communities." Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/670836.

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La agricultura ecológica se ha planteado como una posible solución paliativa a las negativas consecuencias de la intensificación agrícola. Aunque los beneficios de una agricultura más sostenible y menos intensiva son claros para la flora arvense de los campos de cereales gestionados ecológicamente, no son tan obvios para grupos de artrópodos oportunistas como son los pulgones que pueden ocasionar grandes pérdidas económicas, ni para sus enemigos naturales. Los estudios que abordan el tema de planta-artrópodo son escasos y frecuentemente se ciñen a evaluar las abundancias de ciertos grupos en v
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10

Eriksson, Ylva. "Biologisk mångfald bland åkerogräsen. En fältstudie av två åkrar : en konventionellt och en ekologiskt odlad." Thesis, Linköping University, Department of Thematic Studies, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2310.

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<p>Den biologiska mångfalden är viktig inom lantbruket. Jordbrukslandskapets mångfald är vacker för människan att se på och spännande och rogivande att vistas i. Mångfalden innehåller även en genbank som kan bli mycket etydelsefull i framtiden. Dessutom innebär oftast en rik mångfald bland ogräsen även en rik mångfald bland insekter och andra djur, däribland skadeinsekternas predatorer, vilket bidrar till produktiva åkrar. Ogräsens mångfald på åkern beror till stor del på geografiskt läge, klimat och berggrund. Även odlingssättet och tillhörande odlingsåtgärder är avgörande för hur åkerns ogrä
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11

Clough, Yann. "Local and large scale determinants of biodiversity in winter wheat fields." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/clough.

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12

Patron, Nicola. "Diversity, epidemiology and the genetic control of host specificity in the genus Polerovirus." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323341.

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13

Neyret, Margot. "Adventices et érosion du sol dans un agroécosystème montagneux du Nord de la Thaïlande : une étude multidisciplinaire." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS285.

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L’intensification et l’expansion rapide des plantations d’Hevea brasiliensis dans les régions montagneuses d’Asie du sud-est ont conduit à d’importantes dégradations de la biodiversité et des sols. Les adventices remplissent de nombreux services écosystémiques, par exemple en favorisant la protection du sol. Toutefois, les facteurs déterminants les communautés adventices et les interactions entre ces communautés et les processus d’érosion du sol sont mal connus. Deux fois par an entre 2016 et 2018, nous avons réalisé des inventaires botaniques et des caractérisations de sol à Huai Lang, au nor
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14

陳堅峰 and Kin-fung Chan. "Phylogenetic relationships and genetic diversity detected by rapd and isozyme analysis of crop and weedy species of amaranthus." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B29803846.

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15

Chan, Kin-fung. "Phylogenetic relationships and genetic diversity detected by rapd and isozyme analysis of crop and weedy species of amaranthus /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17665450.

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16

Nam-Matra, Rachanee. "A study of the abundance and diversity of rice weeds of Thailand, with special emphasis on their variation with different methods of rice cultivation." Thesis, University of Reading, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590140.

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This is the first comprehensive study of weeds of rice throughout Thailand. Information on the current and past perceptions of problematic weeds of rice was obtained from the results of questionnaires returned from 368 farmers. Data was gathered directly in the field from 56 rice farms throughout north (N). north-east (NE) and central (C) Thailand A total of 145 species of weeds were recorded, of which 24 represented new weed records for Thailand. In farmers' perceptions, major broad-leaved weeds appear to be increasing in severity. while grass weeds are under control. Weed frequency and occur
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17

Kumalasari, Nur Rochmah [Verfasser], Erwin [Akademischer Betreuer] Bergmeier, and Hermann [Akademischer Betreuer] Behling. "Diversity of rice weeds vegetation and its potential as local forage resource in Java, Indonesia / Nur Rochmah Kumalasari. Gutachter: Erwin Bergmeier ; Hermann Behling. Betreuer: Erwin Bergmeier." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://d-nb.info/1052337988/34.

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18

Duarte, Daniel José [UNESP]. "Interferência da comunidade infestante na cultura da soja tolerante ao Glyplosate." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/96982.

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Made available in DSpace on 2014-06-11T19:28:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-06-10Bitstream added on 2014-06-13T19:16:34Z : No. of bitstreams: 1 duarte_dj_me_jabo.pdf: 646154 bytes, checksum: 6c15911c4bb3a0a97a92a9d46a1e98e8 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Um dos mais importantes fatores que afetam negativamente o crescimento, produtividade e qualidade do produto da soja é a interferência proporcionada pelas plantas daninhas. Assim, este trabalho foi conduzido com o objetivo de estudar a evolução fitossociológica da comunida
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19

Jenkins, Noah John. "First season effects of managed flooding on the invasive species Phalaris arundinacea L. and shoreline vegetation communities in an urban wetland." PDXScholar, 2005. https://pdxscholar.library.pdx.edu/open_access_etds/3606.

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Recent management efforts in the Smith and Bybee Lakes Wildlife Area (SBL), a 700-ha preserve in north Portland, Oregon, have included using a water control structure to suppress invasive reed canarygrass (Phalaris arundinacea L.) by flooding during spring and early summer growth periods. For the first year of managed flooding, I sought to determine: (a) the extent and distribution of reed canarygrass at SBL; (b) the effectiveness of the change in water level at suppressing reed canarygrass; and ( c) the effects of the change in water level on other plant species. I established 30 vegetation t
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20

Carvalho, Leonardo Bianco de [UNESP]. "Efeitos de períodos de interferência na comunidade infestante e na produtividade da beterraba." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/96953.

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Made available in DSpace on 2014-06-11T19:28:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-12-19Bitstream added on 2014-06-13T20:18:18Z : No. of bitstreams: 1 carvalho_lb_me_jabo.pdf: 604690 bytes, checksum: 9effc91615f0ae69118f48865d1d6e4e (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Funep<br>A interferência das plantas daninhas em agroecossistemas olerícolas é muito intensa em função do sistema de produção das culturas nesse tipo de ambiente. Para o desenvolvimento de programas de manejo das plantas daninhas, estudos ecológicos das comunidades
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21

Duarte, Daniel José. "Interferência da comunidade infestante na cultura da soja tolerante ao Glyplosate /." Jaboticabal : [s.n.], 2009. http://hdl.handle.net/11449/96982.

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Orientador: Robinson Antonio Pitelli<br>Banca: Núbia Maria Correia<br>Banca: Dagoberto Martins<br>Resumo: Um dos mais importantes fatores que afetam negativamente o crescimento, produtividade e qualidade do produto da soja é a interferência proporcionada pelas plantas daninhas. Assim, este trabalho foi conduzido com o objetivo de estudar a evolução fitossociológica da comunidade infestante crescendo em convivência com a cultura da soja por diferentes períodos, a determinação do PAI e estudar a dominância relativa dos macronutrientes por parte das plantas daninhas e da soja para as condições ex
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22

Carvalho, Leonardo Bianco de. "Efeitos de períodos de interferência na comunidade infestante e na produtividade da beterraba /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/96953.

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Resumo: A interferência das plantas daninhas em agroecossistemas olerícolas é muito intensa em função do sistema de produção das culturas nesse tipo de ambiente. Para o desenvolvimento de programas de manejo das plantas daninhas, estudos ecológicos das comunidades infestantes são de suma importância em razão da vegetação daninha ser conseqüência das condições ecológicas criadas artificialmente pelo homem nos agroecossistemas. O presente trabalho foi desenvolvido com objetivo de realizar estudos fitossociológicos na comunidade infestante da cultura da beterraba de mesa e determinar os períodos
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23

Derrouch, Damien. "Adoption de l’agriculture de conservation : adaptations agronomiques et réponses des communautés adventices." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCK052.

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L’agriculture de conservation regroupe un ensemble de systèmes agricoles basés sur une application continue et simultanée de trois principes : une perturbation minimale du sol, une couverture végétale permanente de la surface du sol et une rotation diversifiée. Cette forme d’agriculture qualifiée de durable a été adoptée en France par les agriculteurs à partir des années 2000. Son adoption par les agriculteurs est freinée par un certain nombre de contraintes dont le développement et la gestion des adventices. En effet, d’un point de vue agronomique, l’adoption de l’agriculture de conservation
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24

Meffin, Ross. "Invasion success and impacts of Hieracium lepidulum in a New Zealand tussock grassland and montane forest." Lincoln University, 2010. http://hdl.handle.net/10182/1808.

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Invasive species represent a major concern; they can result in serious ecological and economic losses and are recognised as one of the most serious threats to global species diversity. Plant invasions are of particular concern in New Zealand, which has high proportions of both naturalised and endemic plant species. In this thesis I focussed on the invasive plant Hieracium lepidulum, an exotic weed introduced from Europe to New Zealand prior to 1941. It is invasive in a variety of habitats in the South Island, where it has steadily increased in distribution and abundance over the last 50 years
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25

Gabriel, Doreen. "Plant communities in organic and conventional agriculture comparing local, landscape and regional effects /." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/gabriel.

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26

Roschewitz, Indra. "Farming systems and landscape context effects on biodiversity and biocontrol /." Doctoral thesis, [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976217961.

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27

Bellanger, Solène. "Etude de la biologie d'une messicole en régression : le bleuet (Centaurea cyanus L.)." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00741148.

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Depuis les années 1950, l'intensification des pratiques agricoles concourt à une augmentation de la pression anthropique entraînant une raréfaction des espèces spécialistes des parcelles cultivées, ce qui contribue à l'érosion de la diversité biologique des agroécosystèmes. Parmi les espèces en déclin, on compte de nombreuses messicoles dont le bleuet (Centaurea cyanus L.), fleur emblématique des moissons. Or, cette espèce peut rendre des services écosystémiques comme hôte de prédateurs de ravageurs des cultures et ressource privilégiée de certains pollinisateurs qui justifieraient son maintie
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28

Ulber, Lena. "Weed species diversity in cropping systems: Management and conservation strategies." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B052-0.

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29

Ulber, Lena [Verfasser]. "Weed species diversity in cropping systems : management and conservation strategies / vorgelegt von Lena Ulber." 2010. http://d-nb.info/1011113090/34.

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30

Szumigalski, Anthony Ralph. "Studies of the functionality of annual crop and weed diversity in polyculture cropping systems." 2005. http://hdl.handle.net/1993/18056.

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31

Gandhi, Harish Tulshiramji. "Jointed goatgrass (Aegilops cylindrica Host) genetic diversity and hybridization with wheat (Triticum aestivum L.)." Thesis, 2005. http://hdl.handle.net/1957/28764.

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Jointed goatgrass (Aegilops cylindrica Host; 2n=4x=28; CCDD) is an agriculturally important species both as a weed and as a genetic resource for wheat (Triticum aestivum L.; 2n=6x=42; AABBDD) improvement. In order to better understand the evolution of this species, the diversity of Ae. cylindrica was evaluated along with its progenitors, Ae. markgrafii (Greuter) Hammer (2n=2x=14; CC) and Ae. tauschii Coss. (2n=2x=14; DD), using chloroplast and nuclear microsatellite markers. Ae. cylindrica had lower levels of plastome and nuclear diversity than its progenitors. The plastome diversity of Ae. cy
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32

Abom, Rickard. "The impact of weeds and prescribed fire on faunal diversity." Thesis, 2015. https://researchonline.jcu.edu.au/44635/1/44635-abom-2015-thesis.pdf.

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Human mediated transport has allowed some species to extend their range beyond their natural ability to disperse. Many exotic annual grasses are highly adaptable and can establish population in their introduced ranges because they can tolerate high variability in local climatic conditions, annual rainfall, and nutrient availability. The most successful invader grasses transform the ecosystems they invade. Invasive grasses can alter the natural fire frequency by increasing local fuel load, and then they flourish under the new conditions they create. This thesis examines the impacts of the intro
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33

Pardini, Eleanor Ashley. "Multi-scale genetic diversity in populations of an introduced, weedy tree species (Albizia julibrissin)." 2006. http://purl.galileo.usg.edu/uga%5Fetd/pardini%5Feleanor%5Fa%5F200605%5Fphd.

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Thesis (Ph. D.)--University of Georgia, 2006.<br>Directed by Jim Hamrick. Includes articles submitted to American journal of botany, Molecular ecology, and International journal of plant sciences. Includes bibliographical references.
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34

Streich, Jared Cameron. "Genetic, Geographic, and Climate Diversity of a Weedy Species: The Brachypodium distachyon Species Complex." Phd thesis, 2018. http://hdl.handle.net/1885/148562.

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The Introduction of novel species into non-native environments can have biodiversity and agricultural effects on landscapes costing billions of dollars in damage each year. Approximately 1.2 million hectares of land are currently deemed unusable globally because of invasive plants. The likelihood of introduced species becoming invasive isn't always understood, nor the effect of introductions immediately apparent. The environment is the primary selection force for screening habitability and is the primary selector for adaptation, but measuring all its
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Assaf, Taher. "The Relationship between Biodiversity and Productivity in Permanent Grasslands and in Ley System." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-B01F-4.

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36

Kumalasari, Nur. "Diversity of rice weeds vegetation and its potential as local forage resource in Java, Indonesia." Thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5EEF-8.

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Barker, Alistair. "Habitat management using stimulo-deterrent diversion techniques to decrease infestation of sugarcane by Eldana saccarina Walker (Lepidoptera: Pyralidae)." Thesis, 2009. http://hdl.handle.net/10539/6961.

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Despite research focused on the control of E. saccharina Walker (Lepidoptera: Pyralidae), it remains the most destructive pest of sugarcane in South Africa and therefore a shift in the approach to the control of this insect was required. Habitat management techniques were employed through trials to understand the mechanisms used by insect pests in their host plant oviposition behaviour. Indigenous and beneficial non-crop plants, which could be used to attract insect pests away from sugarcane were identified and tested. An African grass, Melinis minutiflora, shown to be repellent to lepidoptera
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(9829109), Donna Rayner. "Spiders in central Queensland mango orchards: Diversity, diel activity and impact of pesticides." Thesis, 2000. https://figshare.com/articles/thesis/Spiders_in_central_Queensland_mango_orchards_Diversity_diel_activity_and_impact_of_pesticides/13424552.

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Spiders are naturally occurring predators of insects in agroecosystems. The use of broad spectrum pesticides in agriculture is likely to disrupted spider communities and have a negative impact on their role as biocontrollers. The overall abundance, the species richness, diversity and guild structure of spiders in tropical mango orchards in central Queensland were investigated in this study. Experiments were performed to assess the potential of spiders as natural predators to pest insects in mango orchards. The effects of pesticides on the spider communities were assessed to establish the exten
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Wietzke, Alexander. "Arable plant diversity in conventionally managed farmland of Northwest Germany - Current state and a participative approach to increase farmland biodiversity." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-14A8-7.

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