Academic literature on the topic 'Scree vegetation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Scree vegetation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Scree vegetation"
1
Tomaselli, Marcello, Michele Carbognani, Bruno Foggi, et al. "Scree vegetation in the northern Apennines (N-Italy)." Phytocoenologia 51, no. 1 (2021): 39–94. http://dx.doi.org/10.1127/phyto/2021/0391.
Full text
2
Nowak, Arkadiusz, Sebastian Świerszcz, Sylwia Nowak, and Marcin Nobis. "Vegetation Diversity of Screes and Taluses of The Pamir and South-Western Tian Shan in Middle Asia." Folia Geobotanica 56, no. 1 (2021): 43–67. http://dx.doi.org/10.1007/s12224-021-09392-w.
Full textAbstract:
AbstractThis paper presents the results of phytosociological research on scree vegetation of the Pamir and south-western Tian Shan. We collected 222 phytosociological relevés during field studies conducted in 2015–2019, applying the Braun-Blanquet approach. We identified 21 plant communities on mobile and stabilized screes of colluvial cones, aprons and fans, inhabiting mainly the montane and alpine belts in several ranges (e.g. Peter the First, Alichur, Shugnan, Shachdarian, Darvaz, Rushan, Vanch, Fergana, Kyrgyz and Terskey ranges). As a result we provide the first comprehensive hierarchical syntaxonomic synopsis of scree communities at montane and alpine elevations in the eastern Middle Asia. The collected vegetation relevés represent the majority of the variation among the phytocoenoses of gravel, pebble, cobble and rock block slides and screes in the montane and alpine belts. As a result of field studies and Twinspan analyses, nine associations were identified on screes of the Pamir and western Tian Shan. All these communities were assigned to the Sileno brahuicae-Lactucetalia orientalis Nowak et al. 2021. Additionally, within the nitrophilous compact gravel screes one subassociation of Corydalidetum kashgaricae trigonelletosum gontscharovii was distinguished. In the most arid zone two additional plant associations and one subassociation were identified in gravelly semi-deserts zone. The main factors determining the species composition of the studied associations are scree mobility, rock particle size, elevation above sea level and slope inclination. Our research revealed considerable diversity of scree habitats of montane and alpine belts what might be astonishing regarding harsh environment of this mountainous territory. However, a great number of lineages that evolved here and particularly rich species pool of this habitat in Middle Asia facilitate remarkable diversity among vegetation of taluses and screes. The distinctiveness of species composition is additionally enhanced by high degree of endemism of chasmophytic habitats in the eastern part of Middle Asia. Despite recent developments, the prominent chasmophytic vegetation of Middle Asia still needs thorough studies focused on its relationship to semi-desert, tall-forb and petrophytic communities of high mountains of the Pamir, Hindu-Kush, Kunlun and Central Tian Shan.
3
Galaida, K. P., and B. I. Talgamer. "Scree formation on nonmining flank of an opencast and its impact on vegetation restoration." Earth sciences and subsoil use 44, no. 3 (2021): 323–32. http://dx.doi.org/10.21285/2686-9993-2021-44-3-323-332.
Full textAbstract:
The purpose of the conducted research is to study the regularities of scree formation and assess their impact on self-vegetation of disturbed lands after mining of building stone deposits. The processes of natural formation of scree have been studied, their layering and gravitational alignment have been determined, the factors causing pit bench collapse have been identified. Simulation of the scree formation process allowed to establish the dependence of rock spreading distance on bench height, bench slope angles, as well as on the weight of individual pieces. The slope bench angles with the largest and smallest rock spread distance were found. The simulation showed the influence of the slope bench angles and parameters of the scree formed at the foot of pit benches on the range of debris spread. Three distinct formation stages of scree at the foot of the benches are identified. The angles of transition from one stage of scree formation to another are determined. Recommendations are given to improve the conditions of self-vegetation and minimize the negative factor of scree formation. To form a layer of loose sediments on horizontal bench sites it is proposed to use rocks from scree, which can dramatically reduce the cost of reclamation rather than imported man-made mixture or potentially fertile soils. In order to increase self-vegetation intensity on the flanks of opencasts, it is recommended to increase the bench height and berm width without changing the design angle of the opencast flank slope. To reduce the adverse impact of scree formation on vegetation restoration on the sides at the bench foot, it is proposed to form a trench collecting falling rocks or a rockprotecting wall.
4
Kosinski, Marek. "Synecological differentiation of the scree vegetation of the Polish Tatra Mountains." Phytocoenologia 31, no. 4 (2001): 499–520. http://dx.doi.org/10.1127/phyto/31/2001/499.
Full text
5
Golub, V. B., A. N. Sorokin, and L. F. Nikolaychuk. "(A review) Vegetation of the Czech Republic. 3. Aquatic and wetland vegetation / Ed. by Milan Chytrý. Praga: Academia, 2011. 827 p." Vegetation of Russia, no. 20 (2012): 139–42. http://dx.doi.org/10.31111/vegrus/2012.20.139.
Full textAbstract:
Published 3-volume «Vegetation of the Czech Republic». The first volume was devoted to the characteristics of herbaceous vegetation and vegetation wastes (Vegetace..., 2007), the second — ruderal, and segetal vegetation of rocks and scree (Vegetace..., 2009). In the third volume an overview of the 10 water classes, aquatic and wetland vegetation.
6
Mandžukovski, Dejan, Aco Teofilovski, Marjan Andreevski, Renata Ćušterevska, Rossen Tzonev, and Marius Dimitrov. "Relationships between vegetation of Macedonian pine (Pinus peuce Griseb.) and different types of soils on which it develops." Hacquetia 21, no. 1 (2022): 89–106. http://dx.doi.org/10.2478/hacq-2021-0030.
Full textAbstract:
Abstract This paper deals with relationships between vegetation of Macedonian pine (Pinus peuce) and soils developed on different parent materials on the territory of North Macedonia. We analysed the floristic composition at localities on limestone, on scree of dolomite marble and on scree of silicate. On limestone and scree of dolomite marble, rendzinas on hard limestone and dolomite have developed, and on silicate parent material brown forest soils. The vegetation was sampled according to the Braun-Blanquet approach. DCA and indicator values were used for ecological interpretation of the vegetation patterns. The mechanical and chemical properties of soil and textural classes were also processed. An evident increased presence of carbonates in the soil of scree of dolomite marble on Nidže Mountain was observed, unlike that on Shar Mountain which has formed on typical limestone. Although it is a forest community dominated by the same species, differences between the massifs, the precipitation regime, geology, differences in soil properties in relation to the appearance of carbonates and pH values, and other factors, result in differences in their floristic composition and are the reason for the distinction between the two groups. On silicate on Nidže Mountain, Macedonian pine forests have also developed on brown forest soils, with a different floristic composition to that of the other group on carbonate (dolomite and limestone).
7
Golub, V. B. "(A review) Vegetation of the Czech Republic. 4. Forest and scrub vegetation / Ed. by Milan Chytrý. Praga: Academia, 2013. 551 p." Vegetation of Russia, no. 24 (2014): 154–57. http://dx.doi.org/10.31111/vegrus/2014.24.154.
Full textAbstract:
Published the last, 4th volume summary "Vegetation of the Czech Republic". The first volume was devoted to herbal and shrub vegetation (Vegetace..., 2007), the second — ruderal, and segetal vegetation of rocks and scree (Vegetace..., 2009), third — water, coastal and marsh (Vegetace..., 2011). In the fourth volume of an overview of natural and semi-natural communities forests and shrubs.
8
Lombini, A., C. Ferrari, and B. Carpene. "The Northern Apennine Ultramafic Scree Vegetation as Geochemical Indicator." Giornale botanico italiano 130, no. 1 (1996): 469. http://dx.doi.org/10.1080/11263509609439689.
Full text
9
Hrivnák, Richard, Michal Slezák, Karol Ujházy, et al. "Phytosociological approach to scree and ravine forest vegetation in Slovakia." Annals of Forest Research 62, no. 2 (2019): 183. http://dx.doi.org/10.15287/afr.2019.1355.
Full text
10
Abbasov, N., and M. Seyidov. "Vegetation Around the Third Lake of the Batabat Plateau." Bulletin of Science and Practice 11, no. 4 (2025): 52–57. https://doi.org/10.33619/2414-2948/113/07.
Full textAbstract:
The article examines the vegetation around the third lake of the Batabat Plateau, located in the Shahbuz District of the Nakhchivan Autonomous Republic of Azerbaijan Shahbuz District is one of the territories of the autonomous republic with rich floristic biodiversity. The Batabat Plateau is one of the high-altitude zones distinguished by its diverse flora. Due to the regularities of vertical vegetation distribution in the autonomous republic, steppe, forest, wetland, shrub, meadow, and rocky-scree vegetation types are widespread in this area.
Dissertations / Theses on the topic "Scree vegetation"
1
Tampucci, D. "Glacial and periglacial landforms as warm-stage refugia for cold-adapted plant and arthropod species:ecological and biogeographical significance of a habitat system." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/438244.
Full textAbstract:
Since 1880 air temperature at global scale rapidly increased of c. 0.85 °C likely due to the increasing amount of anthropogenic greenhouse gas, and is forecast to increase over the 21st century as well. Cold-adapted species of the high latitude/altitude are the first to be threatened by such climate change, due to the progressive reduction of their suitable areas.
Microclimatic heterogeneity at landscape level is supposed to play a key role in this scenario providing warm-stage refugia, sites able to preserve suitable climate conditions for cold-adapted species in spite of the ongoing climate warming. Active rock glaciers and debris-covered glaciers (periglacial and glacial landforms characterized by debris with underlying ice) were proposed as potential warm-stage refugia in mountain regions, due to the microclimate effect of underlying ice and the thermal inertia provided by the debris fraction. Besides microclimate heterogeneity at landscape level, macroclimate heterogeneity at regional scale (e.g. the contrast between continental and oceanic climates of inner and peripheral mountain ranges, respectively) can be important, since drive the distribution of periglacial and glacial landforms as potential warm-stage refugia and the effects of climate change themselves on high mountain landscapes (e.g. temporal pattern of glaciers retreat) and ecosystems (e.g. temporal pattern of primary successions on ice-free glacial landforms).
Aim of this study was to analyze the ecological features of periglacial and glacial landforms (active rock
glaciers and debris-covered glaciers on inner mountain ranges, glacier forelands and recent moraines on
peripheral mountain ranges) to test whether they have the main key-requirements to act as potential warm-stage refugia for cold-adapted species. Concerning active rock glaciers and debris-covered glaciers, we considered as key-requirements a cold microclimate able to support cold-adapted species and the ability to cross the altitudinal zonation of mountain ecosystems, thus supporting cold-adapted species in adverse climate contexts. Concerning glacial landforms on peripheral mountain ranges, we considered as key-requirement a relatively slow colonization pattern able to long-lasting support pioneer cold-adapted species in spite of the primary succession development. The study was carried out in different areas of the Italian Alps (Adamello-Presanella, Ortles-Cevedale, Monte Rosa, Orobian Alps) in which different landforms were analyzed and compared. A multidisciplinary approach was followed, considering both the abiotic (ground surface temperature and humidity, soil physical and chemical parameters) and biotic variables (plant and arthropod communities).
Our results show as active rock glaciers and debris-covered glaciers does not differ from the surrounding debris-featured iceless landforms for soil parameters, but for a cold microclimate likely due to the underlying ice. The microclimate can explain why these landforms differ from the surrounding ones for the occurrence of cold-adapted plant and arthropod species. On the Alps, active rock glaciers are unable to cross the altitudinal zonation of mountain ecosystems, thus can only enhance the occurrence of cold-adapted species within their normal altitudinal distribution. By contrast, debris-covered glaciers can cross the climatic treeline, allowing cold-adapted species to live even below their normal altitudinal distribution. However, the relative altitudinal distribution of active rock glaciers and debris-covered glaciers can be inverted on mountain systems drier than Alps, suggesting a similar ecological role of such landforms in opposite macroclimate conditions.
Moreover, our results suggest that mountain systems characterized by oceanic macroclimate could prevent the extinction risk for pioneer cold-adapted species along a chronosequence of glacier retreat, due to the long-lasting persistence of glaciers at relatively low altitudes (as a consequence of high winter precipitations) and the slow colonization of ice-free glacial landforms (as a consequence of long-lasting snow cover and temperatures around zero). Peripheral mountain ranges in particular outlines as oceanic areas of crucial biogeographical importance during both the opposite climate extremes: in cold-climatic stages they can provide refugia for a lot of species, as a consequence of the relatively low ice-sheet expansion; in warm-climatic stages they may provide refugia for cold-adapted species in particular, as a consequence of their climatic, thus glaciological and ecological features.
Books on the topic "Scree vegetation"
1
Kosiński, Marek. Zbiorowiska roślinne piargów tatrzańskiego parku narodowego =: Scree communities of the Tatra National Park. Nakładem Instytutu Botaniki Uniwersytetu Jagiellońskiego, 1999.
Find full text
2
Fransson, Sven. Bryophyte vegetation on cliffs and screes in Western Varmland, Sweden. Svenska Vaxtgeografiska Sallskapet, 2003.
Find full text
3
Fransson, Sven. Bryophyte vegetation on cliffs and screes in western Värmland, Sweden. Svenska växtgeografiska sällskapet, 2003.
Find full text
4
Gransson, Sven. Bryophyte vegetation on cliffs and screes in Western Varmland, Sweden (Acta Phytogeographica Suecica, 86). Uppsala, 2003.
Find full textBook chapters on the topic "Scree vegetation"
1
"5396 scree vegetation [n]." In Encyclopedic Dictionary of Landscape and Urban Planning. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-76435-9_12359.
Full text
2
Nagy, Laszlo, and Georg Grabherr. "The alpine environment: energy and climate." In The Biology of Alpine Habitats. Oxford University PressOxford, 2009. http://dx.doi.org/10.1093/oso/9780198567035.003.0004.
Full textAbstract:
Abstract Radiation and thermal energy in alpine environments is as important for life conditions as in any other life zone, and in addition, mountain environments are characterized by a high kinetic potential, or relief energy. The complex alpine landscape results in a distribution pattern in direct incident solar irradiance that creates a broad range of thermal conditions within the alpine zone. Relief energy manifests in high-energy al-pine mass movement events. These either develop over a long time period (non-catastrophic events) and form permanent landscape features, such as scree, rock glacier, or block fields, or are caused by a sudden descent of material that radically alters landscapes and ecological conditions in the short-term (catastrophic events, such as rock slide, debris slide, mudflow). The historic or contemporaneous movements of high-energy material, including water and ice have traversed the altitude gradients of mountains and contributed to the creation of azonal habitats (see Chapter 6). Topography related phenomena and climate determine largely the alpine life zone and its habitats. The discussion of habitats and their underlying ecological conditions (energy and climate, hydrology, soils, and vegetation) follows a model framework that builds up from mechanistic energy budgets to vegetation feedbacks and considers habitat-forming factors alone, and in combination for habitat characteristics. The logical framework follows that of layers and overlays of layers applied in geographical information systems.
3
"screen [n], vegetation." In Encyclopedic Dictionary of Landscape and Urban Planning. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-76435-9_12340.
Full text
4
"vegetation screen [n]." In Encyclopedic Dictionary of Landscape and Urban Planning. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-76435-9_15730.
Full text
5
Nagy, Laszlo, and Georg Grabherr. "Alpine terrestrial habitats and community types/assemblages." In The Biology of Alpine Habitats. Oxford University PressOxford, 2009. http://dx.doi.org/10.1093/oso/9780198567035.003.0006.
Full textAbstract:
Abstract The habitat diversity of high mountains is well developed along topo-sequences, where ecological conditions such as wind exposure, snow cover and duration, soil availability, soil depth, nutrients and moisture, and disturbance regimes vary. The variation in habitat factors is largely predictable along an idealized slope (e.g. Fig. 6.1) and is reflected in a sequence of habitats/vegetation types. Such habitats may be divided into two main types: zonal, or habitats that reflect the average growth conditions (climate, soil, and water availability) that are prevalent in a latitudinal zone at a given altitude; the existence of azonal habitats is linked to locally deviating growth conditions, largely to topographical extremes. In relation to a slope topo-sequence (e.g. Figs 5.5 and 5.6), zonal habitats are analogous to mid-slope areas and azonal ones to those near to either end. For example, at the top end, gravity-related processes and phenomena exacerbate the scarcity of soil in rocky habitats and disturbance from frost shattering and rock fall, or avalanches create habitats that are exploited by specialist organisms, adapted or resilient to recurrent disturbance. At the lower end of the slope, materials accumulate, such as talus or scree, a surplus of snow (snowbeds), water (mires), or nutrients (colluvia). While it may appear from the above that azonal habitats are characteristic of the extremities of a mountain slope, in reality, they form a patchwork within the expanse of zonal habitats, in topographically fragmented localities (see for example Figs 5.5 and 5.6).
6
Horsley, Karen. "Conclusion – Fading, But Never Faded." In The American Southern Gothic on Screen. Amsterdam University Press, 2022. http://dx.doi.org/10.5117/9789463729444_concl.
Full textAbstract:
The conclusion reaffirms the book’s key premise that the crumbling mansions, decaying vegetation, doom-laden atmospheres, and ruined landscapes of the Southern Gothic speak to its positioning on screen as an othered space. It reflects upon the way in which screen depictions of the contemporary South, refracted through the historical and cultural discourses of a grander more glorious South, have emerged in screen texts to demonstrate an undeniable consistency, identifiable despite the unstable model of categorization in and around which those texts function as genre.
7
Gow, Peter. "Land, People, and Paper in Western Amazonia." In The Anthropology of Landscape. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780198278801.003.0003.
Full textAbstract:
Abstract It is hard to see Amazonia as landscape, in the sense this term has for people from temperate climes. The land does not recede away from a point of observation to the distant horizon, for everywhere vegetation occludes the view. In the forest, sight penetrates only a short distance into the mass of trees. Along the big rivers, you can see further, but even here there is no distant blue horizon. The sky starts abruptly from behind the screen of forest. Sight is hemmed in, and you would succumb to claustrophobia had not a plane journey or many days of travel let you know the scale of this land of big rivers and unending forests. To travel in most of Amazonia is to pass through an endless succession of small enclosed places, and to imagination itself is left the task of contructing out of these an immense extension of space. Only when an Amazonian landscape has been radically transformed by roads and deforestation is it revealed as visually extended space. A bright red road extends to the horizon, while buildings, fences, and isolated trees recede away into the distance. It looks more like a northern temperate landscape, with the wilderness forest no longer dominating the visual field, but simply a hazy transition between land and sky in the far distance.
8
Adetoro, Najimu, and Sikirou Mouritala. "Influence of Soil Moisture Stress on Vegetative Growth and Root Yield of Some Cassava Genotypes for Better Selection Strategy in Screen House Conditions and Different Agro-Ecologies in Nigeria." In Plant Response Mechanisms to Abiotic Stresses [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105526.
Full textAbstract:
Cassava is a vital staple crop for many African populations particularly in Nigeria. This study was conducted to determine the effect of soil moisture on the performance of selected 12 cassava genotypes that were evaluated for yield and related traits under three percentages of field capacity (75% – control, 50%, and 25%) in the screen house and field conditions in three agro-ecologies (Ibadan-Derived Savanna, Mokwa-Southern Guinea Savanna, and Zaria-Northern Guinea Savanna) and randomized complete block design was used. Data were collected on plant height, stem girth, number of nodes and leaves, shoot weight, stomata conductant, stay-green, fresh root weight, and dry matter percentage and were analyzed using descriptive statistics and ANOVA. Genotypes differed significantly across and within locations. The higher stress level (25% field capacity – F.C.) resulted in a more significant reduction in vegetative growth than the moderate stress level of 50% F.C.; moisture levels were uniform over time for plant height and stem girth. The response to moisture levels varied widely among genotypes, indicating that they experienced a higher stress condition. Genotypes IITA-TMS-IBA980581, IITA-TMS-IBA010040, and IITA-TMS-IBA010034 were identified with good drought tolerance. Integrating physiological research with breeding efforts will help in the selection of suitable varieties for release.
9
Esbah H., Kara B., Deniz B., and Kesgin B. "Urban growth pattern of Didim." In Remote Sensing for a Changing Europe. IOS Press, 2009. https://doi.org/10.3233/978-1-58603-986-8-165.
Full textAbstract:
Didim peninsula is the fattest growing urban area in the Aydin province, Turkey. Since 1990, the Town of Didim has changed significantly after discovered by domestic and international tourist. In spite of the recent rapid LULC change, Didim has not been spoiled compared to other big touristic towns of Turkey. Didim has been announced as “Tourism hot spot” in 2000, thus its planning is overseen by the Ministry of Culture and Tourism. Monitoring of the Didim's development is necessary to guide the Ministry in promoting sustainable planning guidelines. The present work aims to determine the characteristics and the amount of urban growth in Didim by using remote sensing and GIS technology. Already rectified Aster (dated 04/27/2005) and Spot 2X (03/02/1994) images were used as well as the population information, aerial photographs, city plans and thematic maps from previous studies. Object oriented classification technique is employed. Some complementary information is extracted from aerials and maps by on-screen digitization. Total of 16 LULC categories are defined. After, putting all information in the GIS database, the pattern of landscape change in Didim is described by using selected landscape metrics. The case study of the Town of Didim offers a good example of the impact of national policies on land use dynamics at local landscape scale. The findings indicate three simultaneous key trends: loss of coniferous forests, the thinning of the maqui vegetation cover, and intensification of urban areas on valuable class II type of soils. Identified trends have significant consequences in terms of the response that ecosystems have given to these anthropogenic landscape alterations. A strategy to promote sustainable land use management should be generated timely manner.
Conference papers on the topic "Scree vegetation"
1
Astamitova, M. A. M., and M. A. M. Astamitova. "Systematic Analysis Towards Highland Alpine Rocky-Scree Vegetation of Central and Eastern Caucasus." In Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" dedicated to the 85th anniversary of H.I. Ibragimov (ISEES 2019). Atlantis Press, 2019. http://dx.doi.org/10.2991/isees-19.2019.109.
Full text
2
Кораблёв, А. П., Е. В. Котлярова, К. А. Арапов, and К. М. Зарипова. "VEGETATION SUCCESSION IN THE ASH-SCRIE FILDS OF THE TOLBACHINSKY DOLE 48 YEARS AFTER THE ERUPTION." In ХXIV международная научная конференция сохранение биоразнообразия Камчатки и прилегающих морей. Crossref, 2023. http://dx.doi.org/10.53657/kbpgi041.2023.73.48.011.
Full text
3
Bly, Patrina, Chelsea Vick, Michael Jefferson, Elizabeth Brinker, and Bernard Branch. "Submerged aquatic vegetation habitat product development: On-screen digitizing and spatial analysis of Core Sound." In IGARSS 2010 - 2010 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2010. http://dx.doi.org/10.1109/igarss.2010.5651718.
Full text
4
Samah, Hodo-Abalo, Magolmèèna Banna, and Belkacem Zeghmati. "Vegetation insulation screen as a passive cooling system in hot humid climate: heat and mass exchanges." In 1st German-West African Conference on Sustainable, Renewable Energy Systems SusRes. Technische Hochschule Wildau, 2020. http://dx.doi.org/10.15771/978-3-9819225-5-4_siii-2b.
Full text
5
Apriyani, Mela, FNU Amarullah, and Aditya Murtilaksono. "Pengaruh Kondisi Kapasitas Lapang Yang Berbeda Terhadap Pertumbuhan Vegetatif Varietas Kacang Hijau (Vigna radiata L.)." In Seminar Nasional Semanis Tani Polije 2020. Politeknik Negeri Jember, 2020. http://dx.doi.org/10.25047/agropross.2020.5.
Full textAbstract:
Kacang hijau merupakan tanaman dengan kemampuan toleran terhadap kekeringan. Teknik budidaya yang mudah menjadikan kacang hijau memiliki peluang usaha dalam bidang agrobisnis. Meskipun demikian, pertumbuhan tanaman kacang hijau dipengaruhi oleh varietas. Kurangnya penggunaan varietas unggul pada lahan marginal akan mengakibatkan kurangnya pertumbuhan tanaman, sebab saat ini lahan pertanian semakin bergeser ke arah lahan yang kurang subur salah satunya kurangnya ketersediaan air di dalam tanah bagi pertumbuhan tanaman. Oleh karena itu, penelitian ini dilakukan guna mengetahui varietas dan kondisi kapasitas lapang yang sesuai bagi pertumbuhan vegetatif kacang hijau. Penelitian dilaksanakan di Screen House dan Laboratorium Perlindungan Tanaman dengan RAK faktorial yang terdiri dari faktor varietas kacang hijau (vima-1, vima-2, vima-3 dan Kutilang) dan faktor kondisi kapasitas lapang (100%KL, 80%KL, 60%KL, 40%KL dan 20%KL. Hasil pengamatan dianalisis ragam dan diuji lanjut dengan Duncan’s Multiple Range Test (DMRT) taraf 5%. Hasil penelitian menunjukkan interaksi antara varietas dan kapasitas lapang berpengaruh terhadap diameter batang kacang hijau. Interaksi tidak berpengaruh terhadap pertumbuhan vegatatif lainnya. Varietas Vima-3 memperoleh rata-rata jumlah daun, kehijauan daun dan luas daun paling tinggi. Rata-rata tinggi tanaman, diameter batang, jumlah daun dan luas daun tertinggi diperoleh pada kondisi 80%KL. Berdasarkan hasil penelitian disimpulkan bahwa varietas Vima-3 memperoleh pertumbuhan vegetatif paling baik sedangkan kondisi kapasitas lapang yang sesuai bagi pertumbuhan vegetatif kacang hijau adalah 80% KL.
6
Guthrie, Richard, Emma Reid, John Richmond, Parwant Ghuman, and Yves Cormier. "InSAR and the Pipeline Geohazards Toolbox: Instructions for Use As of 2018." In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78571.
Full textAbstract:
Interferometric Synthetic Aperture Radar (InSAR) is a type of active remote sensing whereby a satellite transmits electromagnetic radiation (microwaves) at the ground and measures the differential phase of the reflected signal over multiple images (or multiple antennas on a single satellite). InSAR has the potential to provide centimeter and even millimeter-scale measurements of displacement over time, but is sensitive to vegetation, topography, and atmospheric effects. We consider herein, the application of InSAR at two known landslides on the Enbridge pipeline system, and discuss the strengths, weaknesses, values, and limitations of its application in the Geohazard Management of landslides impacting pipeline ROW’s. We compare information provided at each site by InSAR (both L-band and X-band) to data derived by mapping using Light Detection and Ranging (LiDAR) or air photographs, to differential LiDAR techniques, and to data derived from subsurface measurements (slope inclinometers). In doing so we find that L-Band data can be an effective tool to establish the extent or footprint of movement (or lack of movement) at known landslide locations, extending the interpretive power of a specialist and the understanding of event magnitude, and potentially affecting the mitigation options. Further, L-Band InSAR can be used in a supporting role to pre-screen areas for active landslides along the right of way (ROW), however, data gaps, a lack of explanatory power, and considerable noise in the results mean that a user step that further considers the terrain, other sources of data, and the identified magnitude, is essential. X-Band InSAR appeared impractical for ROW monitoring where vegetation prevented coherence between images, however, X-Band InSAR was able to detect small displacements at above ground infrastructures.
7
Diwakar, Philip, and Jonathan Berkoe. "Safety and Reliability Studies Using Analysis Tools." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37338.
Full textAbstract:
Computational Fluid Dynamics and Computational Structural Mechanics (also called Finite Element Analysis of FEA) and a combination of the two — Fluid Solid Interaction (FSI) — have long been used for safety of Personnel in Industry. This paper gives four examples of using these tools for designing equipment and mitigations to provide a safe and amenable working environment for personnel. The first example deals with the use of CFD to resize or relocate exhaust stacks — to prevent personnel working on an adjacent elevated platform being exposed to hot gasses or low oxygen levels — under high wind conditions or the presence of an inversion layer in the atmosphere. The second example is on construction of a retractable protective screen — for personal working on an elevated platform — in the event of a leak of combustive gas from an adjoining unit. CFD is used to determine the length and temperature of the flame while FEA is used to determine the impinging forces half way between the combustion source and the workers to select a suitable flexible retractable screen for protection. A third example is on cooling methane and ethane vapors heated during initial ship loading to prevent flaring caused by pressure build up. Flaring causes several environmental issues such as degradation of vegetation and trees, temperature effects on nearby occupied building, large luminescence, atmospheric disturbances and turbulence on passing aircraft, as well as loss of production. The stresses on the piping network, flanges, valves, pads and shoes — which may lift by Joule-Thompson effect caused temperature differentials — are studied using FEA to ensure the safe operation. A final example is on the use of CFD and FEA to determine the sources of flow-induced and cavitation-induced acoustic noise and vibration and water hammer produced by flow restrictions and flashing of liquid to vapor behind a vee-ball control valve and a ball control valve. The frequencies are extracted from CFD and checked against the natural frequencies from modal analysis and experimental bump test for typical resonant frequencies in the system. Mitigations are proposed to ensure lower noise levels and reduce vibrations in the system for the comfort of personnel working in the vicinity.
8
Miller, Mary L., and Cameron Shankland. "Utilizing Low Level Videography and GIS to Rethink Traditional Phase I Environmental Site Assessments." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10428.
Full textAbstract:
The method used for traditional “Phase I” Environmental Site Assessments (ESA’s) has required staff to physically walk the rights-of-way (ROW). In order to compete the ESA in a more timely and cost-effective manner than traditional techniques allowed, URS Corporation (URS) contracted LinearVision (LV) to fly the utility ROW and collect low-level, airborne, geo-referenced videography, complemented with geo-referenced still-imagery to enable URS to complete the Phase I ESA data analysis in their office. The data provided enabled URS’s analysts the ability to access all ROW points of interest in their Geographic Information System (GIS), and “fly” the line with oblique and downward perspectives from their computer screen. The digital video could be sped up or slowed down allowing URS the ability to review each frame for careful, detailed analysis, and identify potential recognized environmental conditions (RECs) and encroachment upon the ROW. The high-resolution still-imagery provided URS the ability to zoom into the potential REC for a closer inspection of site features, vegetation, and surrounding land use. URS created a database of potential RECs and areas of interest along with a simple user interface as a deliverable to the client, which allows the user to link directly to specific video frames and high-resolution photographs for their own review and analysis. The cost of the airborne data capture and processing was substantially less than a traditional Phase I ESA. Furthermore, the video and high-resolution images provided for a more comprehensive analysis tool, which can be reviewed by multiple analysts and catalogued for future reference by third parties. An additional benefit is that the high-resolution photographs can be imported into AutoCAD or other software for development of maps and figures. Overall, the net result of low-level GIS integrated videography is enhanced quality of data and a 50% reduction in total cost for the ROW project as compared to traditional Phase I ESA methodology.
9
Saşco, Elena. "Screening of wheat genotypes response under drought controlled conditions." In Scientific International Symposium “Advanced Biotechnologies - Achievements and Prospects” (VIth Edition). Institute of Genetics, Physiology and Plant Protection, 2022. http://dx.doi.org/10.53040/abap6.2022.75.
Full textAbstract:
The present study was carried out to estimate the response of native wheat genotypes (Tri-ticum aestivum L.) Moldova 614, Moldova 66 and the Selania/Accent line to water stress in the early stages of growth and to use sources with a high level of adaptability in resistance improve-ment programs to drought. The effect of osmotic stress on early growth stages was evaluated un-der temperature conditions of 15oC and 25oC, using polyethylene glycol (PEG 6000) treatment at concentrations of 10% and 20% d/v. In the conditions of water restrictions produced by PEG 6000 in the 10% concentration both at the optimal temperature of 25oC, but also at the suboptimal one of 15oC, the investigated indices showed the response of tolerance, but also of high resistance. When administering the osmotic in the concentration of 20% at a temperature of 25oC, both the average resistance and the sensitivity of the investigated characters were attested. Moldova 614 recorded the lowest reduction of 23.7% for plant vigor index, while L Selania/Accent recorded a massive reduction of 72.8% for seed vigor index. In the conditions of interaction of major stress factors (PEG 20% x 15oC) the genotypes responded with a severe decrease of the inves-tigated parameters. More advantageous PVI was attested only in the Moldova 614 genotype. The variance analysis revealed the temperature factor with the highest weight in the variability of the root and stem length characters (85.7% and 72.2%). The water deficit explained respec-tively 12.0% and 22.5% of the variance of the characters, while the significant interactions of the stress factors attested advanced weight for the length of the stem in relation to the length of the root. This phenomenon indicates the increased vulnerability of the stem, a phenomenon also highlighted by the phenotypic character of the root/stem ratio. Purpose.Wheat contributes to global consumption with 55% of carbohydrates, but also 20% of food calories, maintaining an important position in the international grain trade [3]. Abiotic stress extremes such as drought, temperature, salinity, and nutrient imbalance represent major challenges to the grain industry. Drought affects plant growth from germination to matu-rity, causing morphological, biological, physiological, and molecular changes. More likely to be affected are the stages of early vegetation and reproduction [3]. Tolerance to water deficit as well as thermal stress is a difficult, polygenic quantitative characteristic [2, 3]. In efficient and repeatable phenotypic expression of drought tolerance, it is necessary to use simple early scre-ening methods [2, 4]. One of the sources of improving wheat drought tolerance is presented by the introgression of resistances from the wild gene pool as well as local ones [3]. Anticipating testing in field conditions, targeted are the tolerance indices in the early growth phase under artificially stressful conditions [2, 4]. The present study aimed to select local wheat genotypes, well adapted to the induction of water stress by the osmotic PEG 6000 under different tempe-rature conditions.
Reports on the topic "Scree vegetation"
1
Miller, Gad, and Jeffrey F. Harper. Pollen fertility and the role of ROS and Ca signaling in heat stress tolerance. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7598150.bard.
Full textAbstract:
The long-term goal of this research is to understand how pollen cope with stress, and identify genes that can be manipulated in crop plants to improve reproductive success during heat stress. The specific aims were to: 1) Compare heat stress dependent changes in gene expression between wild type pollen, and mutants in which pollen are heat sensitive (cngc16) or heat tolerant (apx2-1). 2) Compare cngc16 and apx2 mutants for differences in heat-stress triggered changes in ROS, cNMP, and Ca²⁺ transients. 3) Expand a mutant screen for pollen with increased or decreased thermo-tolerance. These aims were designed to provide novel and fundamental advances to our understanding of stress tolerance in pollen reproductive development, and enable research aimed at improving crop plants to be more productive under conditions of heat stress. Background: Each year crop yields are severely impacted by a variety of stress conditions, including heat, cold, drought, hypoxia, and salt. Reproductive development in flowering plants is highly sensitive to hot or cold temperatures, with even a single hot day or cold night sometimes being fatal to reproductive success. In many plants, pollen tube development and fertilization is often the weakest link. Current speculation about global climate change is that most agricultural regions will experience more extreme environmental fluctuations. With the human food supply largely dependent on seeds, it is critical that we consider ways to improve stress tolerance during fertilization. The heat stress response (HSR) has been intensively studied in vegetative tissues, but is poorly understood during reproductive development. A general paradigm is that HS is accompanied by increased production of reactive oxygen species (ROS) and induction of ROS-scavenging enzymes to protect cells from excess oxidative damage. The activation of the HSR has been linked to cytosolic Ca²⁺ signals, and transcriptional and translational responses, including the increased expression of heat shock proteins (HSPs) and antioxidative pathways. The focus of the proposed research was on two mutations, which have been discovered in a collaboration between the Harper and Miller labs, that either increase or decrease reproductive stress tolerance in a model plant, Arabidopsis thaliana (i.e., cngc16--cyclic nucleotide gated channel 16, apx2-1--ascorbate peroxidase 2,). Major conclusions, solutions, achievements. Using RNA-seq technology, the expression profiles of cngc16 and apx2 pollen grains were independently compared to wild type under favourable conditions and following HS. In comparison to a wild type HSR, there were 2,776 differences in the transcriptome response in cngc16 pollen, consistent with a model in which this heat-sensitive mutant fails to enact or maintain a normal wild-type HSR. In a comparison with apx2 pollen, there were 900 differences in the HSR. Some portion of these 900 differences might contribute to an improved HSR in apx2 pollen. Twenty-seven and 42 transcription factor changes, in cngc16 and apx2-1, respectively, were identified that could provide unique contributions to a pollen HSR. While we found that the functional HS-dependent reprogramming of the pollen transcriptome requires specific activity of CNGC16, we identified in apx2 specific activation of flavonol-biosynthesis pathway and auxin signalling that support a role in pollen thermotolerance. Results from this study have identified metabolic pathways and candidate genes of potential use in improving HS tolerance in pollen. Additionally, we developed new FACS-based methodology that can quantify the stress response for individual pollen in a high-throughput fashion. This technology is being adapted for biological screening of crop plant’s pollen to identify novel thermotolerance traits. Implications, both scientific and agricultural. This study has provided a reference data on the pollen HSR from a model plant, and supports a model that the HSR in pollen has many differences compared to vegetative cells. This provides an important foundation for understanding and improving the pollen HSR, and therefor contributes to the long-term goal of improving productivity in crop plants subjected to temperature stress conditions. A specific hypothesis that has emerged from this study is that pollen thermotolerance can be improved by increasing flavonol accumulation before or during a stress response. Efforts to test this hypothesis have been initiated, and if successful have the potential for application with major seed crops such as maize and rice.