scholarly journals Arable Weed Patterns According to Temperature and Latitude Gradient in Central and Southern Spain

Atmosphere ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 853
Author(s):  
María Luisa Gandía ◽  
Carlos Casanova ◽  
Francisco Javier Sánchez ◽  
José Luís Tenorio ◽  
María Inés Santín-Montanyá
Keyword(s):  
Climate Change ◽  
Climatic Conditions ◽  
Effect Of Temperature ◽  
Weed Species ◽  
Stellaria Media ◽  
Climate Gradients ◽  
Weed Communities ◽  
Arable Weed ◽  
Temperature Ranges ◽  
Local Species

(1) Background: In agro-ecosystems, the success of the crops has a strong connection to biodiversity in the landscape. In the face of climate change, it is important to understand the response to environmental variation of weed species by means of their distribution. In the last century, biodiversity has been impacted due to a variety of stresses related to climate change. Although the composition of vegetation tends to change at a slower rate than climate change, we hypothesize species present in weed communities are distributed in diverse patterns as a response to the climate. Therefore, the general aim of this paper is to investigate the effect of temperature, using latitude as an indicator, on the composition and distribution of weed communities in agro-ecosystems. (2) Methods: Weeds were monitored in georeferenced cereal fields which spanned south and central Spanish regions. The graphic representation according to latitude allowed us to identify groups of weeds and associate them to a temperature range. We classified weeds as generalist, regional, or local according to the range of distribution. (3) Results: The monitoring of species led to the classification of weeds as generalist, regional or local species according to latitude and associated temperature ranges. Three weed species that were present in all latitude/temperature regions, were classified as generalist (Linaria micrantha (Cav) Hoffmanns & Link, Sonchus oleraceous L., and Sysimbrium irium L.). The species were classified as regional or local when their presence was limited to restricted latitude/temperature ranges. One weed, Stellaria media (L.) Vill., was considered a local species and its distribution dynamics can be considered an indicator of temperature. (4) Conclusions: The novel methodology used in this study to assign weed distribution as an indicator of climatic conditions could be applied to evaluate climate gradients around the world.

Environmental factors including management practices as correlates of weed community composition in spring seeded crops

1992 ◽  
Vol 70 (10) ◽  
pp. 1931-1939 ◽  
Author(s):  
M. R. T. Dale ◽  
A. G. Thomas ◽  
E. A. John
Keyword(s):  
Community Composition ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Variables ◽  
Management Practices ◽  
Geographic Region ◽  
Climatic Conditions ◽  
Weed Species ◽  
Weed Communities ◽  
Seed Crops

The relationship between the weed communities and environmental variables such as soil, crop, and management was investigated in two provinces of Canada. The frequencies of weed species were recorded in cereal and oilseed fields in Saskatchewan (2244 fields over 4 years) and Manitoba (864 fields over 3 years), Canada. Information on some of the physical characteristics of the fields and on the management practices imposed on them was also collected, in part by questionnaire. The two kinds of data were ordinated together using canonical correspondence analysis to assess the relationships between the species and the environmental variables. In the Saskatchewan data, there was a clear and consistent separation of the species into groups along an axis correlated with soil zone and the associated climatic gradient. In the Manitoba data, the same groups of species did not separate as clearly or as consistently, although geographic region was a major determinant of the weed communities. The greater variability may be due to the fact that the gradient of soil types is much more restricted in Manitoba and not as closely correlated with climatic conditions. In both provinces, culture practices were less important as correlates of the weed community composition than soil type or, to a certain extent, the previous crop. Key words: canonical correspondence analysis, cereal crops, oil seed crops.

scholarly journals Modified grape composition under climate change conditions requires adaptations in the vineyard

OENO One ◽  
2017 ◽  
Vol 51 (2) ◽  
pp. 147 ◽  
Author(s):  
Cornelis Van Leeuwen ◽  
Agnès Destrac-Irvine
Keyword(s):  
Climate Change ◽  
Plant Material ◽  
Water Status ◽  
Climatic Conditions ◽  
Effect Of Temperature ◽  
Significant Advance ◽  
Wine Quality ◽  
Berry Size ◽  
Aroma Precursors ◽  
The Impact

<p style="text-align: justify;"><strong>Aim:</strong> Major effects of climate change are an increase in temperature, a modification in rainfall patterns and an increase in incoming radiations, in particular UV-Bs. Grapevines are highly sensitive to climatic conditions. Hence, plant development, grape ripening and grape composition at ripeness are modified by climate change. Some of these changes are already visible and will be amplified over the coming decades; other effects, although not yet measurable, can be predicted by modeling. The objective of this paper is to assess which modifications in wine quality and typicity can be expected and what levers growers can implement to adapt to this changing situation. </p><p style="text-align: justify;"><strong>Methods and results:</strong> This paper focusses on the effect of temperature, vine water status and UV-B radiation in viticulture. Vine phenology is driven by temperacture. A significant advance in phenology (i.e. budburst, flowering and veraison dates) has been observed since the early 1980’s in most winegrowing regions. The combined effect of advanced phenology and increased temperatures results in warmer conditions during grape ripening. In these conditions, grapes contain more sugar and less organic acids. Composition in secondary metabolites, and in particular aromas and aroma precursors, is dramatically changed. Increased drought, because of lower summer rain and/or because of higher reference evapotranspiration (ET<sub>0</sub>), induces earlier shoot growth cessation, reduced berry size, increased content in skin phenolic compounds, lower malic acid concentrations and modified aroma and aroma precursor profiles. Increased UV-B radiation enhances the accumulation of skin phenolics and modifies aroma and aroma precursor profiles. Over the next decades, an amplification of these trends is highly likely. Major adaptations can be reached though modifications in plant material (grapevine varieties, clones and root stocks), vineyard management techniques (grapevine architecture, canopy management, harvest dates, vineyard floor management, timing of harvest, irrigation) or site selection (altitude, aspect, soil water holding capacity).</p><p style="text-align: justify;"> <strong>Conclusion:</strong> Climate change will induce changes in grape composition which will modify wine quality and typicity. However, these modifications can be limited through adaptations in the vineyard.</p><p style="text-align: justify;"><strong>Significance and impact of the study:</strong>  This study assesses the impact of major climatic parameters (temperature, water and radiation) on vine physiology and grape ripening. It addresses the issue of how the expected changes under climate change will impact viticulture. It is shown that appropriate levers do exist to allow growers to adapt to this new situation. Among these, modifications in plant material and viticultural techniques are the most promising tools.</p><div> </div>

Weed species diversity in spring barley varies with crop rotation and tillage, but not with nutrient source

Weed Science ◽  
1997 ◽  
Vol 45 (6) ◽  
pp. 798-806 ◽  
Author(s):  
F. Craig Stevenson ◽  
Anne Légère ◽  
Régis R. Simard ◽  
Denis A. Angers ◽  
Denis Pageau ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Crop Rotation ◽  
Spring Barley ◽  
Climatic Conditions ◽  
Dairy Manure ◽  
Weed Species ◽  
Nutrient Source ◽  
Weed Communities ◽  
Weed Species Richness

The development of sustainable farming systems depends on our ability to predict and manage the response of weed communities to changes in cropping practices. A study was established at Normandin, Québec, Canada, to investigate the influence of liquid dairy manure and mineral fertilizer, as well as chisel and moldboard plow tillage systems, in a spring barley monoculture and a 3-yr spring barley-forage rotation that included red clover and timothy. Weed species richness (Margalef's DMG), evenness (Shannon's E), and diversity (Shannon's H') were examined in these treatments from 1992 to 1995. Nutrient source had no effect on any of the three diversity indices. Evenness values were extremely low in all years, suggesting dominance of a few weed species in most treatments. Weed species richness and diversity generally were greater in the barley-forage rotation compared with the monoculture. Tillage effects on richness and diversity varied with crop rotation. Margalef's DMGand Shannon's H' were greater in 1993 and 1995, but they were lower in 1994 when chisel was compared with moldboard plowing in the monoculture. In 1994, chickweed density was about five times greater in the chisel-plowed monoculture compared with other treatment combinations of rotation and tillage. In 1995, only one species with a density of six plants m−2occurred in the moldboard-plowed monoculture compared with three to six species and densities of 51 to 832 plants m−2in the other rotation by tillage treatments. Climatic conditions and herbicide use patterns in the different crop rotation treatments may have contributed to the more dynamic nature of weed species diversity in the barley monoculture. Reduced frequency of tillage and herbicide application; management of the forage stands, especially with regard to their termination; and improved soil resource availability likely explained the increased but more stable diversity of the weed communities in the barley-forage rotation.

scholarly journals Modified grape composition under climate change conditions requires adaptations in the vineyard

OENO One ◽  
2017 ◽  
Vol 51 (2) ◽  
pp. 147-154 ◽  
Author(s):  
Cornelis Van Leeuwen ◽  
Agnès Destrac-Irvine
Keyword(s):  
Climate Change ◽  
Plant Material ◽  
Water Status ◽  
Climatic Conditions ◽  
Effect Of Temperature ◽  
Significant Advance ◽  
Wine Quality ◽  
Berry Size ◽  
Aroma Precursors ◽  
The Impact

Aim: Major effects of climate change are an increase in temperature, a modification in rainfall patterns and an increase in incoming radiations, in particular UV-Bs. Grapevines are highly sensitive to climatic conditions. Hence, plant development, grape ripening and grape composition at ripeness are modified by climate change. Some of these changes are already visible and will be amplified over the coming decades; other effects, although not yet measurable, can be predicted by modeling. The objective of this paper is to assess which modifications in wine quality and typicity can be expected and what levers growers can implement to adapt to this changing situation. Methods and results: This paper focusses on the effect of temperature, vine water status and UV-B radiation in viticulture. Vine phenology is driven by temperacture. A significant advance in phenology (i.e. budburst, flowering and veraison dates) has been observed since the early 1980’s in most winegrowing regions. The combined effect of advanced phenology and increased temperatures results in warmer conditions during grape ripening. In these conditions, grapes contain more sugar and less organic acids. Composition in secondary metabolites, and in particular aromas and aroma precursors, is dramatically changed. Increased drought, because of lower summer rain and/or because of higher reference evapotranspiration (ET0), induces earlier shoot growth cessation, reduced berry size, increased content in skin phenolic compounds, lower malic acid concentrations and modified aroma and aroma precursor profiles. Increased UV-B radiation enhances the accumulation of skin phenolics and modifies aroma and aroma precursor profiles. Over the next decades, an amplification of these trends is highly likely. Major adaptations can be reached though modifications in plant material (grapevine varieties, clones and root stocks), vineyard management techniques (grapevine architecture, canopy management, harvest dates, vineyard floor management, timing of harvest, irrigation) or site selection (altitude, aspect, soil water holding capacity). Conclusion: Climate change will induce changes in grape composition which will modify wine quality and typicity. However, these modifications can be limited through adaptations in the vineyard.Significance and impact of the study:  This study assesses the impact of major climatic parameters (temperature, water and radiation) on vine physiology and grape ripening. It addresses the issue of how the expected changes under climate change will impact viticulture. It is shown that appropriate levers do exist to allow growers to adapt to this new situation. Among these, modifications in plant material and viticultural techniques are the most promising tools. 

Do we know how mosquito disease vectors will respond to climate change?

2019 ◽  
Vol 3 (2) ◽  
pp. 115-132 ◽  
Author(s):  
Rija Falimanalina Andriamifidy ◽  
Nils Benjamin Tjaden ◽  
Carl Beierkuhnlein ◽  
Stephanie Margarete Thomas
Keyword(s):  
Climate Change ◽  
Disease Transmission ◽  
Human Mobility ◽  
Experimental Studies ◽  
Thermal Conditions ◽  
Climatic Conditions ◽  
Life Cycles ◽  
Future Research ◽  
Open Questions ◽  
Temperature Ranges

Abstract Mosquito-borne diseases are on the rise globally. Besides invasion processes and the increasing connectivity between distant regions through the trade of goods and human mobility, climate change is seen as an important driver for changing the likelihood of occurrence of vectors and diseases, respectively. Ectothermic insects respond directly to thermal conditions and thus we can expect them to follow climatic trends. However, a variety of species and different stages in their life cycles need to be considered. Here, we review the current literature in this field and disentangle the state of knowledge and the challenges and open questions for future research. The integration of diurnal temperature ranges in prospective experimental studies will strongly improve the knowledge of mosquitoes’ ecology and mosquito-borne disease transmission for temperate regions in particular. In addition, invasive mosquitoes are known to rapidly adapt to the climatic conditions, but the underlying processes are not yet fully understood.

scholarly journals Species composition, richness, and diversity of weed communities of winter arable land in relation to geo-environmental factors: a gradient analysis in mainland Italy

Botany ◽  
2020 ◽  
Vol 98 (7) ◽  
pp. 381-392 ◽  
Author(s):  
Emanuele Fanfarillo ◽  
Sandrine Petit ◽  
Fabrice Dessaint ◽  
Leonardo Rosati ◽  
Giovanna Abbate
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Species Composition ◽  
Arable Land ◽  
Weed Species ◽  
Winter Cereal ◽  
Shannon Diversity ◽  
Weed Communities ◽  
Crop Type ◽  
Arable Weed

The interest in knowledge of the weed communities of arable land is growing worldwide. Italy is one of the countries in Europe that is the most biodiverse, geographically and environmentally heterogeneous, and rich in arable weed species. Thus, in this study, the geo-environmental factors influencing the floristic composition, the species richness, and the Shannon diversity of weed communities of Italian winter arable crops were investigated along a gradient across mainland Italy. Original data were collected in the spring of 2018 in 106 winter cereal and legume arable fields from one fixed area plot per field. Environmental and geographic data were retrieved for each plot, including latitude, longitude, elevation, soil texture, soil pH, continentality, temperature, and precipitation. The effect of crop type was also tested. Latitude was the main driver of floristic differentiation between the studied plant communities, followed by precipitation, temperature, continentality, elevation, and longitude. Soil features and crop type had no significant effects. Higher values of species richness and Shannon diversity were found in southern areas and at higher elevations. Significant explanatory variables accounted for 11.55% of the total variation in species composition of the surveyed communities. The results are discussed and compared with those of similar studies in other Eurasian countries.

scholarly journals „Flax specialists”-weed species extinct in Poland?

2010 ◽  
Vol 61 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Krzysztof Heller
Keyword(s):  
Chenopodium Album ◽  
Weed Species ◽  
Stellaria Media ◽  
Fibre Flax ◽  
The Past ◽  
Thlaspi Arvense ◽  
Polygonum Convolvulus ◽  
Root Crops ◽  
Weed Communities ◽  
Made In

„Flax specialists”-weed species extinct in Poland? The results of a research on segetal weed communities in fibre flax in Poland are presented, with respect to different regions of cultivation, and changes in the level of infestation during the past forty years. Observations on composition and abundance of weed infestations were made in fields in six experimental farms at the Institute of Natural Fibres and Medicinal Plants. The observations conducted in the period 1967-2008 did not show the occurrence of weed species from the group of so-called "flax specialists": Lolium remotum Schrank, Spergula arvensis L. subsp. maxima (Weiche) O. Schwarz, Camelina alyssum (Mill.) Thell. and Cuscuta epilinum Weihe Ex Boenn. In Poland, weed populations in fibre flax consist of species typical for cereals and root crops: Chenopodium album L., Polygonum convolvulus L., Viola arvensis Murr., Stellaria media Vill., Lamium amplexicaule L., Thlaspi arvense L., Elymus repens (L.) Gould, and Polygonum nodosum Pers.

scholarly journals Growth and reproductive characteristics of C4 weeds under climatic conditions of the Czech Republic  

2013 ◽  
Vol 59 (No. 7) ◽  
pp. 309-315 ◽  
Author(s):  
J. Satrapová ◽  
T. Hyvönen ◽  
V. Venclová ◽  
J. Soukup
Keyword(s):  
Climate Change ◽  
Czech Republic ◽  
Climatic Factors ◽  
Climatic Conditions ◽  
Amaranthus Retroflexus ◽  
Seed Number ◽  
Weed Species ◽  
The Czech Republic ◽  
Climate Conditions ◽  
The Impact

Climate change could promote the altitudinal spread of C4 weed species since they can benefit from warmer climate. The effects of altitude and climatic conditions (the sum of temperatures above 5&deg;C and precipitation) on the biomass and seed production of two annual C4 weeds &ndash; Amaranthus retroflexus L. and Echinochloa crus-galli (L.) P.<br />Beauv. &ndash; were studied in the Czech Republic. We included both temperature and precipitation variables in the study since they both serve as basic indicators of climate change and thus they have the greatest impact on plant development. The experiment was carried out by sowing both weed species on m<sup>2</sup> area with four replicates in seven localities differing in altitude in 2010 and 2011. We found no significant impacts due to altitude on any variables measured. However, climatic factors explained 44.5% of the variation in plant dry biomass and 41.4% of the seed number produced by A. retroflexus. The same variables did not significantly contribute to the variation in above-ground biomass or seed number of E. crus-galli. These results show the impact of climate conditions to vary between species and not to limit reproduction at high altitudes.

Effect of Weather Factors on the Variability of Economic Characteristics in Sunflower Hybrids

2019 ◽  
pp. 70-84
Keyword(s):  
Climate Change ◽  
Climatic Conditions ◽  
Economic Traits ◽  
Weather Factors

This article presents the results of twelve-year trials of the Region and Ryabota simple hybrids and the three-line hybrid Kameniar breeding laboratory of IOC NAANU hybrid labs, and analyzes their adaptation to ongoing climate change. The purpose of our work was to determine the formation of major economic traits in sunflower hybrids, depending on the agro-climatic conditions of the year.

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