Weeds in spring cereal fields in Finland - a third survey

Salonen, Jukka T.; Hyvönen, Terho; Jalli, Heikki

doi:10.23986/afsci.5705

Cited by 48 publications

(46 citation statements)

References 14 publications

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“…The first phase in this assessment was definition of the weed flora of Europe, which resulted in the list of 2220 species. The species number can be regarded as high in comparison with the 768 species reported earlier by Glemnitz et al (2006) or compared with those reported in national weed surveys, for example the 168 species from Finland (Salonen et al 2001) and 224 species from Denmark (Andreasen and Stryhn 2008). The high number of weed species in the European weed flora was partly due to inclusion of plant species occupying habitats other than agricultural ones (see Table 2), in contrast to previous studies.…”

Section: Discussioncontrasting

confidence: 41%

Alien species in the Finnish weed flora

Hyvönen¹,

Jalli²

2008

AFSci

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The present study aimed at assessing the invasion of alien weed species in Finland based on a review of their occurrence in the Finnish weed flora. The evaluation was conducted for the three phases of the invasion process, i.e. introduction, naturalization and invasion. The literature review revealed that 815 alien weed species occur in Finland of which 314 are regarded as naturalized. Based on their occurrence in different climate zones, the risk of naturalization of new harmful alien weed species was deemed low for those species not currently found in Finland, but higher for species occurring as casual aliens in Finland. In the latter group, 10 species of concern were detected. Exploration of the distribution patterns of naturalized species within Finland revealed species occupancy to be dependent on the residence time of the species. Established neophytes can be expected to extend their ranges and to increase occupation of agricultural habitats in the future.

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Section: Discussioncontrasting

confidence: 41%

Alien species in the Finnish weed flora

Hyvönen¹,

Jalli²

2008

AFSci

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“…Our results are in accordance with previous studies conducted in the Mediterranean region, verifying always high weed diversity: 175 species in 138 surveys conducted by Cirujeda et al (2011) in Spain and 278 species in 86 surveys in Greece (Damanakis, 1983). These numbers are significantly higher compared with those found in the north and central Europe (Holzner and Immonen, 1982;Chancellor and FroudWilliam, 1984;Sutcliffe and Kay 2000;Salonen et al, 2001). The botanical families with greater representation were the same in both periods, and also with similar representation (of about 50%): Asteraceae followed by Poaceae and Fabaceae.…”

Section: Weed Vegetation Composition and Diversitymentioning

confidence: 79%

Evaluation of weed flora changes in Portugal in a 10 year basis

Ramôa¹,

Silva²,

Travlos³

et al. 2017

Aust J Crop Sci

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The aim of this study was to assess the composition of weed communities starting from a rainfed farming system (1997), to the early period of transformation in agricultural systems with the adoption of irrigation (2007). The assessments were made within a 10-year interval and the floristic surveys were conducted in the same georeferenced plots. In 1997, the surveys were mostly performed in winter cereals (wheat, oat, barley), while in 2007, considering the same georeferenced plots, there were winter cereals and also irrigated olive groves, parcels of fallow, pasture and pine forest. Weed flora was determined by means of relative frequency, abundance and weed infestation degree. The effect of time was also evaluated by applying the methodology of variance analysis on the values of Shannon-Wiener Index. Canonical Correspondence Analysis was used to complement this information only for 2007 to know how the flora was distributed by the different cultures. Our results revealed that in both cases weed flora was of high diversity (229 and 264 species in 1997 and 2007, respectively), with the most representative families being always the same, namely Asteraceae, Poaceae and Fabaceae. The number of weeds that could be of concern for the farmers revealed to be relatively low. Our study confirmed that despite of the intensification of the agricultural production system, biodiversity increased over time. In both years, Lolium rigidum was present at high densities.

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“…These numbers are much higher compared to those found in northern and central Europe, agreeing with Holzner & Immonen (1982), indicating that floristic diversity is higher in the Mediterranean areas. Thus, in central and southern England 46 species were recorded in 100 plots (Sutcliffe & Kay, 2000); in northern England, 87 species in 1,021 samples (Chancellor & Froud-William, 1984); and in Finland, 160 species in 690 plots (Salonen et al, 2001). On the other hand, Calha et al (2014a) have identified 43 weed species in maize, accounting for 21 families in Golegã, Ribatejo (Portugal).…”

Section: Resultsmentioning

confidence: 99%

Study of Autumn-Winter Weeds in Portugal and Its Ecological Preferences

Ramôa

Silva

Vasconcelos³

et al. 2015

Planta daninha

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-The conclusion of the dam project located in Alqueva, in Southern Portugal, has resulted in a significant increase of new irrigated areas, since 2006. This has meant that, in recent years, there have been progressive flora changes in farming systems traditionally implemented in the Alentejo region. The present work has analyzed the weed flora in an early stage of these changes, and the impact of environmental factors on the distribution of natural vegetation under Mediterranean climate conditions in the influence area of Alqueva. In 2007, 105 floristic surveys were carried out in autumn-winter crop plots or other soil use, and 264 species were identified. Families with higher expression were: Asteraceae, Poaceae, and Fabaceae. Only three species have been identified in more than half of farms, Avena sterilis, Phalaris minor and Lolium rigidum and they were part of the 15 species that revealed high and very high infestation degrees. Soil texture and extractable phosphorus have been determined as active ecological factors, according to the method of ecological profiles and Mutual Information. Therefore, these factores were those with the greatest influence on the species distribution. L. rigidum distribution showed to be associated with medium soil texture and A. sterilis distribution also showed to be associated with medium and fine soil texture soils, without showing ecological preference by extractable phosphorus. The distribution of P. minor was not related to the soil texture but showed preference for soils with medium phosphorus content.Keywords: spontaneous flora, Mediterranean climate, ecological profiles, active factors, texture, extractable phosphorus. Palavras-chave: vegetação espontânea, clima mediterrâneo, perfis ecológicos, fatores ativos, textura, fósforo extraível. RESUMO -A concretização do projeto da barragem do

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Weeds in spring cereal fields in Finland - a third survey

Cited by 48 publications

References 14 publications

Alien species in the Finnish weed flora

Alien species in the Finnish weed flora

Evaluation of weed flora changes in Portugal in a 10 year basis

Study of Autumn-Winter Weeds in Portugal and Its Ecological Preferences

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