DYNAMICS OF BORDER VEGETATION AND EDAPHIC-CLIMATOLOGY OF CLEARINGS IN AN AREA OF CAATINGA IN THE SEMI-ARID REGION OF BRAZIL.

The use and unsustainable occupation in the semi-arid areas have resulted throughout its historical process in strong negative impacts by opening clearings in the areas of Caatinga, which need to be identified and studied to reverse this situation. The objective of this work was to analyze the dynamics of border of vegetation and edaphic-climatological clearings in a Caatinga area in the municipality of Sumé, state of Paraíba, Brazil. The study was conducted in the Experimental Area Reserved for Ecology and Dynamic Studies of the Caatinga of LAEB/CDSA/UFCG (7°39'38.8'' S and 36°53'42.4'' W, with 538 m of altitude). The clearings were isolated, and monitored between 2013 and 2015, soil and agrometeorological data were collected. Shrubs and live trees with diameter at ground level and height >0.03 and >1.0 m respectively were considered as border individuals. The highest values of soil density were observed for the clearings that presented the lowest levels of organic matter. 62% of the clearings had an increase in their area due to the high mortality of Croton blanchetianus Baill. and 38% had their area reduced due to the colonization of young, mainly Jatropha mollissima (Pohl) Baill. The floristic composition of the border comprised six species distributed in six genera and four families, being Fabaceae and Euphorbiaceae the most representative. The number of border individuals and recorded mortality were fully correlated with climatic parameters. Therefore, although the clearings are in the process of natural regeneration, climatic factors have strongly influenced the delay of this process.

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Spatio-Temporal Response of Vegetation Indices to Rainfall and Temperature in A Semiarid Region

Sustainability ◽

10.3390/su12051939 ◽

2020 ◽

Vol 12 (5) ◽

pp. 1939 ◽

Cited By ~ 3

Author(s):

Edith Olmos-Trujillo ◽

Julián González-Trinidad ◽

Hugo Júnez-Ferreira ◽

Anuard Pacheco-Guerrero ◽

Carlos Bautista-Capetillo ◽

...

Keyword(s):

Arid Region ◽

Climatic Factors ◽

Time Lag ◽

Vegetation Indices ◽

Climatic Variables ◽

Semiarid Region ◽

Linear Regression Models ◽

Spatio Temporal ◽

Semi Arid Region ◽

Semi Arid

In this research, vegetation indices (VIs) were analyzed as indicators of the spatio-temporal variation of vegetation in a semi-arid region. For a better understanding of this dynamic, interactions between vegetation and climate should be studied more widely. To this end, the following methodology was proposed: (1) acquire the NDVI, EVI, SAVI, MSAVI, and NDMI by classification of vegetation and land cover categories in a monthly period from 2014 to 2018; (2) perform a geostatistical analysis of rainfall and temperature; and (3) assess the application of ordinary and uncertainty least squares linear regression models to experimental data from the response of vegetation indices to climatic variables through the BiDASys (bivariate data analysis system) program. The proposed methodology was tested in a semi-arid region of Zacatecas, Mexico. It was found that besides the high values in the indices that indicate good health, the climatic variables that have an impact on the study area should be considered given the close relationship with the vegetation. A better correlation of the NDMI and EVI with rainfall and temperature was found, and similarly, the relationship between VIs and climatic factors showed a general time lag effect. This methodology can be considered in management and conservation plans of natural ecosystems, in the context of climate change and sustainable development policies.

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Natural Regeneration of the Mangrove Vegetation on Abandoned Salt Ponds in Ceará, in the Semi-Arid Region of Northeastern Brazil

Diversity ◽

10.3390/d11020027 ◽

2019 ◽

Vol 11 (2) ◽

pp. 27 ◽

Cited By ~ 2

Author(s):

Armando Reis-Neto ◽

Antonio Meireles ◽

Marília Cunha-Lignon

Keyword(s):

Natural Regeneration ◽

Arid Region ◽

Ecosystem Dynamics ◽

Shrimp Farming ◽

Northeastern Brazil ◽

Integrated Analysis ◽

Technical Problems ◽

Mangrove Vegetation ◽

Semi Arid Region ◽

Semi Arid

The development of the mangrove in Ceará state, northeastern Brazil, is limited by local environmental and climatic factors, associated with the variables that determine the region’s semi-arid climatic conditions. The same conditions also contribute to the installation of artisanal saltworks in estuarine environments. The artisanal production of salt peaked in the 20th century, but with the decline of this activity, the salt evaporation ponds were abandoned, and have been incorporated back into the natural marine-estuarine environment and colonized by mangrove forests. In the early 2000s, however, the expansion of shrimp farming operations impacted this same environment. The present study was based on a spatiotemporal analysis of the natural regeneration of the mangrove vegetation in abandoned salt pond areas in the Brazilian semi-arid region between 1968 and 2009. The integrated analysis of mangrove ecosystem dynamics and the legislation that regulates the licensing of these economic activities identified a number of technical problems in the formulation and execution of the COEMA resolution 02/2002, which permits the installation of shrimp farms in areas dominated by the mangrove. The findings of the present study reinforce the need for a careful reformulation of the Ceará state environmental legislation, in order to guarantee the maximum possible conservation of the coastal zone.

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Drivers and Environmental Impacts of Vegetation Greening in a Semi-Arid Region of Northwest China since 2000

Remote Sensing ◽

10.3390/rs13214246 ◽

2021 ◽

Vol 13 (21) ◽

pp. 4246

Author(s):

Zhenzong Wu ◽

Jian Bi ◽

Yifei Gao

Keyword(s):

Arid Region ◽

Vegetation Index ◽

Climatic Factors ◽

Agricultural Practices ◽

Northwest China ◽

Terrestrial Vegetation ◽

Moderate Resolution Imaging Spectroradiometer ◽

Semi Arid Region ◽

Semi Arid ◽

Dynamics Of Vegetation

The dynamics of terrestrial vegetation have changed a lot due to climate change and direct human interference. Monitoring these changes and understanding the mechanisms driving them are important for better understanding and projecting the Earth system. Here, we assessed the dynamics of vegetation in a semi-arid region of Northwest China for the years from 2000 to 2019 through satellite remote sensing using Vegetation Index (VI) data from the Moderate Resolution Imaging Spectroradiometer (MODIS), and analyzed the interannual covariation between vegetation and three climatic factors—air temperature, precipitation, and vapor pressure deficit (VPD)—at nine meteorological stations. The main findings of this research are: (1) herbaceous land greened up much more than forests (2.85%/year vs. 1.26%/year) in this semi-arid region; (2) the magnitudes of green-up for croplands and grasslands were very similar, suggesting that agricultural practices, such as fertilization and irrigation, might have contributed little to vegetation green-up in this semi-arid region; and (3) the interannual dynamics of vegetation at high altitudes in this region correlate little with temperature, precipitation, or VPD, suggesting that factors other than temperature and moisture control the interannual vegetation dynamics there.

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FLORISTIC AND VEGETATIONAL ASPECTS OF AN INSELBERG IN THE SEMI-ARID REGION OF NORTHEAST BRAZIL

Edinburgh Journal of Botany ◽

10.1017/s0960428609005241 ◽

2009 ◽

Vol 66 (2) ◽

pp. 329-346 ◽

Cited By ~ 13

Author(s):

P. Gomes ◽

M. Alves

Keyword(s):

Species Richness ◽

Arid Region ◽

Floristic Composition ◽

Northeastern Brazil ◽

Northeast Brazil ◽

Surrounding Area ◽

Floristic Inventory ◽

Exposed Rock ◽

Semi Arid Region ◽

Semi Arid

Inselbergs are rocky environments that support a unique flora distinct from that of the surrounding area. The objectives of this work were to conduct a floristic inventory of an inselberg in the semi-arid region of Northeast Brazil, and to investigate the relationship between its flora and the flora of the surrounding area. The following questions were addressed: is the species richness comparable to other inselbergs in northeastern Brazil; is the floristic composition of the inselberg more similar to other inselbergs or to the surrounding Caatinga vegetation; and do the similarities in the floristic composition of inselbergs depend on the distance between them? This work documents 201 species in 62 families. Cyperaceae (28 spp.), Euphorbiaceae (19), Poaceae (15), Orchidaceae (11) and Bromeliaceae (9) are the most species-rich families. On the inselberg the plants are distributed in islands found on exposed rock, in fissures and in depressions in the rock. Variations in species richness in the region were assessed by comparison of floristic inventories conducted in other inselbergs of the semi-arid region with those of this study. The flora of the inselberg under investigation is more similar to the flora of other nearby inselbergs than to the vegetation of the surrounding semi-arid region.

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Natural regeneration of the vegetation of an abandoned agricultural field in a semi-arid region: a focus on seed bank and above-ground vegetation

Revista Brasileira de Botânica ◽

10.1007/s40415-018-0510-8 ◽

2019 ◽

Vol 42 (1) ◽

pp. 43-51

Author(s):

Pedro Arthur do Nascimento Oliveira ◽

Josiene Maria Falção Fraga dos Santos ◽

Elcida de Lima Araújo ◽

Danielle Melo dos Santos ◽

André Mauricio Melo Santos ◽

...

Keyword(s):

Seed Bank ◽

Natural Regeneration ◽

Arid Region ◽

Ground Vegetation ◽

Agricultural Field ◽

Semi Arid Region ◽

Semi Arid

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The effects of gap size and age on natural regeneration of Picea mongolica in the semi-arid region of Northern China

New Forests ◽

10.1007/s11056-012-9318-8 ◽

2012 ◽

Vol 44 (2) ◽

pp. 297-310 ◽

Cited By ~ 6

Author(s):

Chao Zhang ◽

Chun Jing Zou ◽

Heli Peltola ◽

Kai Yun Wang ◽

Wen Duo Xu

Keyword(s):

Natural Regeneration ◽

Arid Region ◽

Northern China ◽

Gap Size ◽

Picea Mongolica ◽

Semi Arid Region ◽

Semi Arid

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Aerosol iron solubility in a semi-arid region: temporal trend and impact of anthropogenic sources

Tellus B ◽

10.3402/tellusb.v62i2.16519 ◽

2010 ◽

Vol 62 (2) ◽

Author(s):

Ashwini Kumar ◽

M. M. Sarin

Keyword(s):

Arid Region ◽

Temporal Trend ◽

Anthropogenic Sources ◽

Iron Solubility ◽

Semi Arid Region ◽

Semi Arid

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The Molecular Characterization and Biological Assessment of the Leaves Extracts of Loofah Reveal their Nutraceutical Potential

Recent Patents on Food Nutrition & Agriculturee ◽

10.2174/2212798411999201110211931 ◽

2020 ◽

Vol 11 ◽

Author(s):

Takoua Ben Hlel ◽

Feten Belhadj ◽

Fatih Gül ◽

Muhammed Altun ◽

Ayşe Şahin Yağlıoğlu ◽

...

Keyword(s):

Fatty Acids ◽

Phenolic Compounds ◽

Hela Cell ◽

Arid Region ◽

Biological Properties ◽

Biological Assessment ◽

Omega 3 ◽

Hela Cell Lines ◽

Semi Arid Region ◽

Semi Arid

Background:: Luffa cylindrica is a plant that is widely distributed in Africa and Asia and it can be grown in regions with tropical or subtropical climates. Few patents dealt with Loofah biological properties, including some functional foods formulated from its leaves. Objective:: This study aimed to structurally and functionally characterize the bioactive compounds of L. cylindrica leaves grown in two different environments. Methods:: The extracts of L. cylindrica leaves collected from two Tunisian locations: Essouasi (LE), a semi-arid region and Medenine (LM) an arid region, were investigated for their phenolic compounds and fatty acids using HPLC/TOF-MS and GCMS techniques respectively. Furthermore, the antioxidant capacity was evaluated with DPPH, Chelating effect, Hydroxyl radical and Superoxide anion scavenging activities while the anticancer activity against HeLa cell lines was assessed using xCELLigence real time cell analyzer and lactate dehydrogenase cytotoxicity assay. Results:: The antiproliferative capacity of both extracts was time and dose-dependent with LE presenting the lowest HeLa cell index (CI = 0.035 ± 0.018, 250 μg/ml). LE also showed the best cytotoxic capacity (56.49 ± 0.8%) and antioxidant potential (IC50 = 54.41 ± 1.12 μg/ml for DPPH and 12.12 ± 0.07 μg/ml for chelating effet). 14 phenolic compounds were detected in LE with ferulic acid being the major compound (5128.5 ± 4.09 μg Phenols/g) while LM had only 6 phenolics. GCMS analysis showed the presence of omega-3 fatty acids in LE. Conclusions:: Our findings suggest that L. cylindrica leaves, especially when collected from semi-arid regions, are promising for formulating nutraceuticals of interest.

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