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Wyszukujesz frazę "desertification" wg kryterium: Temat

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Tytuł:
Desertification: on significance of the term and research of the phenomenon
Autorzy:
Plit, Florian
Miłaszewska, Małgorzata
Tematy:
desertification
definitions
regional analysis
Pokaż więcej
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2032489.pdf  Link otwiera się w nowym oknie
Opis:
First elaborations on desertification come from the Renaissance, but the term was used for the first time by Aubreville in 1949. In later years, many significantly varying in meaning definitions were elaborated. In later periods, researchers' attention concentrated on different areas. At the turn of the XIXth century, interest was mainly focused on Asia, later on the peripheries of the Sahara, in recent years on desertification in post-soviet Central Asia, China and Mongolia.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Desertification detected in the Udhaim River Basin, Iraq. Based on Spectral Indices Derived from Remote Sensing Images
Autorzy:
Mail, Abd Al Salam Mohammed
Tematy:
Desertification
GIS
remote sensing
spectral indices
Iraq
Pokaż więcej
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2108226.pdf  Link otwiera się w nowym oknie
Opis:
In this study, changes in Land Use Land Cover (LULC) have been investigated over the Udhaim River Basin in Iraq by using spectral indices. NDVI, NDBI, NDWI, NDBaI, and CI represent respectively the vegetation, built-up, water bodies, bare-land, and soil crust of LULC. Two different images were acquired for the analysis, namely a Landsat 5 TM image from 1 July 2007 and a Landsat 8 OLI from 5 June 2015, both representing summer conditions. Results show that the percentages of vegetated land and water body areas have decreased. On the contrary, the percentages of built-up, bare land and soil crust areas have increased. The loss of vegetated areas and water body areas is a signal of land degradation leading to desertification, due to the combined effects of climate conditions, water deficit and human activities. Field observation shows that human activities have a significant impact on land degradation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the environment and migration in southern Morocco - example of the Mhamid Oasis
Autorzy:
Sobczak, Karolina
Fulara, Jakub
Tematy:
Morocco
migrations
desertification
Mhamid
Oued Dra
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Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2030328.pdf  Link otwiera się w nowym oknie
Opis:
The subject of the article is an analysis of changes in the environment and economy of oases in southern Morocco, on the basis of a case study of Mhamid. The conclusions are that water investments carried out in the Draa Valley intensified the desertification process. This is exemplified by a stronger aeolian deflation, worsening living conditions of the population, limiting of arable areas and finally, migration. Paradoxically, because of desertification, the region has a chance to develop economically because the newly created sand dunes fields stimulate development of tourism.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Threat of degradation of agricultural land in Ukraine through a negative balance of nutritional elements in growing of field cultures
Autorzy:
Lykhochvor, Vladimir
Hnativ, Peto
Petrichenko, Vasil
Ivaniuk, Viktor
Szulc, Wiesław
Rutkowska, Beata
Veha, Natalia
Olifir, Yuri
Tematy:
grain
nitrogen
phosphorus
potassium
balance of elements
soil degradation
desertification
Pokaż więcej
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Powiązania:
https://bibliotekanauki.pl/articles/55789095.pdf  Link otwiera się w nowym oknie
Opis:
Fertilization in cultivation of grain and other crops in Ukrainian agriculture is insufficient, which may lead to the loss of fertility and irreversible soil depletion in the coming years. The article aims to identify the leading causes of land degradation and desertification in Ukraine, and to explore the problem of high deficits of nitrogen, phosphorus, and potassium caused by the alienation of nutrients from the soil and disproportionate ratios of fertilizers in intensive agricultural production. Since the beginning of the marketing year 2020/2021, Ukraine has exported approximately 27.6 million tons of cereals and legumes, i.e. 6.3 million tons less than in the same period of the previous marketing year. Specifically, 12.8 million tons of wheat, 3.89 million tons of barley, 10.52 million tons of corn, and 81.2 thousand wheat flour were exported. The calculations showed that – according to the content of nutrients in grain products – harvest from Ukrainian fields extracted more than 1.888 million tons N, 0.275 million tons P, and 0.386 million tons K. In 2019, 88.3% of N, 15.9% of P and 2.6% of K was exported from Ukraine with field crops. Corn absorbs the most essential nutrients among cereals. Winter wheat ranks the second. Reversing the negative balance of N, P, and K is possible by doubling mineral fertilization. Soil degradation and desertification are a disaster for Ukraine, and a significant threat to global food security. These processes can be stopped if the following measures are implemented: 1) additional application of organic fertilizers, 2) larger-scale cultivation of perennial legumes, 3) growing green manure crops, 4) application of optimal doses of mineral fertilizers and microelements, 5) application of waste biomass as fertilizer, and 6) liming of soils.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impacts of Deforestation on the Spread of Mastomys natalensis in Nigeria
Autorzy:
Adetola, O. O.
Adebisi, M. A.
Tematy:
Biodiversity
Deforestation
Desertification
Habitat destruction
Lassa fever
Mastomys natalensis
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Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1066303.pdf  Link otwiera się w nowym oknie
Opis:
Lassa fever is an acute viral disease that is endemic in West African countries of Nigeria, Liberia, Sierra Leone and Guinea. Since the first case was reported in Lassa town Nigeria in 1969, Mali 2009, Ghana in late 2011 and serological evidences of the virus was reported in Togo and Benin in 2014 the virus has assumed an endemic proportion in West Africa. Deforestation which is the deliberate disruption of the natural forest ecosystem has been implicated as a major cause of the virus holding to the fact that the natural habitats of the rodent host have been tampered and hence they seek refuge in human homes. Most research work have been centered on the epidemiology ,hygiene and mode of transmission of the zoonotic virus without critical consideration of habitat destruction of this rodents that negate their relocation to human homes in search of food and alternative shelter. This review article aims to raise awareness on the urgent need to control deforestation acts in order to prevent further outbreak of Lassa fever.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forest in Karst Mountain sinkhole of southeastern China provides refugium for the preservation of bryophyte diversity
Autorzy:
Li, X.
Zhang, Z.
Wang, Z.
Shi, K.
Tematy:
negative landform
natural refuge
complex microenvironment
karst rocky
desertification
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Wydawca:
Polskie Towarzystwo Botaniczne
Powiązania:
https://bibliotekanauki.pl/articles/2130582.pdf  Link otwiera się w nowym oknie
Opis:
The negative landform of sinkholes provides belowground level refugia for a high diversity of forest species compared to the forests on the surface of surrounding karst plateaus in southeastern China. Bryophyte diversity in sinkhole forests is also likely to be high. In this study, bryophytes of an underground forest sinkhole (UFS), and two forests (Forest Karst Mountain 1; FKM1) and (Forest Karst Mountain 2; FKM2) on the surface of the karst plateau were compared to understand the role of the sinkhole forest in the conservation of bryophyte diversity and the relationships between bryophyte diversity, environmental factors, and soil nutrients. Significantly more bryophyte taxa were recorded from the sinkhole forest (71 taxa, 36 genera, 23 families) than those in the forest on the plateau surface, which was the closest to the sinkhole (FKM1; 29 bryophyte taxa, 16 genera, 12 families), and even fewer bryophytes were found in the forest more distant to the sinkhole (FKM2; 22 taxa, 17 genera, eight families). Twenty-four liverwort taxa were collected from the sinkhole forest, two from the closest surface forest (FKM1) and none from the furthest surface forest (FKM2). Ninety-three percent of the bryophytes in karst mountain sinkhole were not found on surface forest. The diversity index trend was as follows: UFS > FKM1 > FKM2, and the evenness index trend was in the opposite direction as follows: UFS < FKM1 < FKM2. The beta diversity showed that the Jaccard index among the three forests was 0–0.25, reflecting a huge difference between the sinkhole forest and the two surface forests. Canonical correspondence analysis showed that light was the most important factor affecting the distribution of bryophytes in the sinkhole forest, while temperature and humidity were key factors for the distribution of bryophytes in the two surface forests. Further, soil parameters, namely, soil organic carbon, total nitrogen, total phosphorus, total potassium, alkali- hydrolyzed nitrogen, and available phosphorus changed gradually from UFS to FKM1 and to FKM2. The sinkhole forest, located in a landform with the unique negative topography enclosed by cliffs, and with a complex microenvironment, provides a natural refuge for bryophyte species in areas where forests have been negatively impacted by karst rocky desertification.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany rozwoju przestrzennego wybranych oaz w arabskich krajach naftowych (przykłady Libii i Zjednoczonych Emiratów Arabskich)
Changes in the spatial development of selected oases in Arab countries, exporters of oil (ex. Libya and United Arab Emirates)
Autorzy:
Łęcka, Izabella
Wydawca:
Polskie Towarzystwo Geograficzne
Cytata wydawnicza:
Łęcka I., 2016, Zmiany rozwoju przestrzennego wybranych oaz w arabskich krajach naftowych (przykłady Libii i Zjednoczonych Emiratów Arabskich), „Czasopismo Geograficzne”, 87(1): 29-60
Opis:
W tekście porównano rozwój przestrzenny (w aspekcie ekonomicznym) oaz Fazzanu w Libii oraz oaz Liwa i Al-Ajn w Zjednoczonych Emiratach Arabskich na tle uwarunkowań przyrodniczych, ciągłości historycznej istnienia osadnictwa na tych terenach, decyzji politycznych w zakresie rozwoju lokalnego oraz w kontekście tak zwanej „wielkiej polityki”. Oba kraje są czołowymi eksporterami ropy naftowej na świecie i w obu krajach miał miejsce w minionych latach wzrost dochodów z tytułu eksploatacji tego surowca oraz duży napływ cudzoziemców do pracy wobec stosunkowo niewielkiej populacji rdzennych mieszkańców i szeroko zakrojonych planów modernizacji kraju, w tym także obszaru oaz. Rozwój przestrzenny oaz i ich zagospodarowanie (modernizacja) tylko pozornie powstrzymały proces pustynnienia, w istocie jednak go przyspieszają. Pustynnienie (przy stałym silnym wyczerpywaniu zasobów dostępnej wody) stale zagraża tym terenom, zmniejszając szanse przyszłych pokoleń na godne zamieszkiwanie na tych terenach. Konkluzja ta stoi w sprzeczności z tym co można obecnie zaobserwować w terenie, czyli z coraz lepiej zagospodarowanymi terenami zielonymi, dostępnością komunikacyjną i rozbudowaną przestrzenią publiczną i gospodarczą w oazach. A jednak wyczerpanie zasobów wody i zasolenie gleb pewnego dnia zamknie dotychczasowy rozdział rozwoju przestrzennego omawianych oaz i zapewne ponownie się one wyludnią.
In the article Author compare the spatial development (in economic terms) of oasis in Fazzan (Libya) and in United Arab Emirates (Liwa oasis and Al-Ain) on the background of natural conditions, historical continuity of settlements in these areas, local government decision and in the context of international policy. Both countries are world's leading exporters of oil and in both countries took place in recent years, growth in revenues from the exploitation of this raw material, and a large influx of foreigners to work compare to relatively small population of indigenous people and extensive plans for modernization of the country, including the area of oases. The spatial development of oases and their spatial development (modernization) only seemingly stopped the process of desertification, but in fact it go faster. Desertification (with constant strong depletion of available water resources) is constantly threatening these sites, reducing the chances of future generations to live with a dignity in these areas. This conclusion is at odds with what can now be seen in the field: more and more green areas, transport accessibility, extensive public space and economic activity in the oases. But the exhaustion of water resources and soil salinity someday will close the current chapter of spatial development and oases will probably again be depopulated.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Wyświetlanie 1-10 z 19

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