scholarly journals Caatinga Vegetation Dynamics under Various Grazing Intensities by Steers in the Semi-Arid Northeast, Brazil

1999 ◽  
Vol 52 (3) ◽  
pp. 241 ◽  
Author(s):  
Severino G. De Albuquerque
Keyword(s):  
Vegetation Dynamics ◽  
Northeast Brazil ◽  
Caatinga Vegetation ◽  
Grazing Intensities ◽  
Semi Arid

Three new species of Graphidaceae (lichenized Ascomycota) from the semi-arid region of northeast Brazil

Phytotaxa ◽  
2017 ◽  
Vol 331 (2) ◽  
pp. 289 ◽  
Author(s):  
JACIELE DE OLIVEIRA DANTAS ◽  
ELAINE SANTOS ALVES ◽  
ROBERT LÜCKING ◽  
MARCELA EUGENIA DA SILVA CÁCERES
Keyword(s):  
New Species ◽  
Fungal Species ◽  
Northeast Brazil ◽  
Additional Material ◽  
Caatinga Vegetation ◽  
The Family ◽  
Three New Species ◽  
Semi Arid Region ◽  
Santa Maria ◽  
Semi Arid

Three new lichenized fungal species in the family Graphidaceae are described from Northeast Brazil. Graphis alba has lirellae with a conspicuous white cover, eventually becoming striate, small, (sub-)muriform ascospores, and stictic acid. Halegrapha redonographoides features somewhat pseudostromatic ascomata with immersed lirellae, a completely carbonized excipulum, and small, submuriform ascospores, in combination with a norstictic acid chemistry. Thelotrema pachysporoides has an ecorticate, white thallus and produces brown, 7–13-septate, 25–35 × 7–10 µm large ascospores. The new species were found in an isolated remnant of Caatinga vegetation, at Fazenda Santa Maria da Lage, Poço Verde, Sergipe state, with additional material of one of the species also detected in the state of Tocantins.

Seismic stratigraphy of a partially filled incised valley on a semi-arid continental shelf, Northeast Brazil

2021 ◽  
Vol 41 (2) ◽  
Author(s):  
Antonio Rodrigues Ximenes Neto ◽  
Paulo Roberto Silva Pessoa ◽  
Lidriana de Souza Pinheiro ◽  
Jáder Onofre de Morais
Keyword(s):  
Continental Shelf ◽  
Seismic Stratigraphy ◽  
Northeast Brazil ◽  
Incised Valley ◽  
Semi Arid

Macroalgae Mariculture as a Social and Environmental Alternative for Coastal Traditional Communities of the Semi-Arid Region of Northeast Brazil

2020 ◽  
pp. 91-98
Author(s):  
Ivanilson de Souza Maia ◽  
Dárlio Inácio Alves Teixeira ◽  
Vigínia Maria Cavalari Henriques ◽  
Maulori Curié Cabral
Keyword(s):  
Arid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Traditional Communities

scholarly journals Soil Water Balance and Vegetation Dynamics in a Semi-arid Mediterranean Ecosystem

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 76
Author(s):  
Ioannis N. Daliakopoulos ◽  
Ioanna Panagea ◽  
Luca Brocca ◽  
Erik van den Elsen
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Water Availability ◽  
Vegetation Dynamics ◽  
Soil Water Balance ◽  
Mediterranean Ecosystem ◽  
Limiting Factor ◽  
Arid Conditions ◽  
Water Balance Models ◽  
Semi Arid

Under arid conditions, where water availability is the limiting factor for plant survival, water balance models can be used to explain vegetation dynamics. [...]

“Macaíba , ” an emerging oil crop: Nutritional evaluation of the pulp and kernel fruits from semi‐arid and coastal zone of northeast Brazil

2020 ◽  
Author(s):  
Raquel Barbosa da Silva ◽  
Edvaldo Vieira Silva‐Júnior ◽  
Larissa Maria Barreto de Medeiros Trigueiros ◽  
Rayza Helen Graciano dos Santos ◽  
Jailane de Souza Aquino ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Northeast Brazil ◽  
Nutritional Evaluation ◽  
Oil Crop ◽  
Semi Arid

Major Constituents of the Foliar Epicuticular Waxes of Species from the Caatinga and Cerrado

2000 ◽  
Vol 55 (9-10) ◽  
pp. 688-692 ◽  
Author(s):  
Antonio F. M. Oliveira ◽  
Antonio Salatino
Keyword(s):  
Ursolic Acid ◽  
Native Plants ◽  
Northeast Brazil ◽  
Arid Ecosystem ◽  
Epicuticular Waxes ◽  
Evergreen Species ◽  
Semi Arid

Abstract The epicuticular waxes of leaves of four species (Aspidospermci pyrifolium, Capparis yco, Maytenus rigida and Ziziphus joazeiro) from the Caatinga, (a semi-arid ecosystem of Northeast Brazil) and four species (Aristolochia esperanzae, Didymopanax vinosum, Strychnos pseudoquina and Tocoyena formosa) from the Cerrado, (a savanna ecosystem covering one third of the Brazilian territory), were analyzed. Six species contained a high content (above 60 μg.cm-2) of wax, four of them from the Caatinga. Triterpenoids and n-alkanes were the most frequent and abundant constituents found in the species from both habitats. The distribution of n-alkanes predominated by homologues with 27, 29, 31 and 33 carbon atoms, displayed no consistent differences between species from the two habitats. Lupeol, β-amyrin, epifriedelinol and ursolic acid were the triterpenoids found. Triterpenoids clearly predominate over alkanes in the waxes from the Cerrado species. The waxes of two evergreen species from the Caatinga yielded n-alkanes as predominant constituents. A comparison of foliar epicuticular waxes of native plants from ecosystems with different hydric constraints is discussed.

scholarly journals Spatiotemporal Variation of Vegetation Coverage and Its Response to Climate Factors and Human Activities in Arid and Semi-Arid Areas: Case Study of the Otindag Sandy Land in China

2020 ◽  
Vol 12 (12) ◽  
pp. 5214 ◽  
Author(s):  
Hao Wang ◽  
Fei Yao ◽  
Huasheng Zhu ◽  
Yuanyuan Zhao
Keyword(s):  
Human Factors ◽  
Human Activities ◽  
Vegetation Dynamics ◽  
Spatiotemporal Variation ◽  
Vegetation Coverage ◽  
Arid Areas ◽  
Climate Factors ◽  
Sandy Land ◽  
Otindag Sandy Land ◽  
Semi Arid

Vegetation coverage is a key variable in terrestrial ecosystem monitoring and climate change research and is closely related to soil erosion and land desertification. In this article, we aimed to resolve two key scientific issues: (1) quantifying the spatial-temporal vegetation dynamics in the Otindag Sandy Land (OSL); and (2) identifying the relative importance of climate factors and human activities in impacting vegetation dynamics. Based on correlation analysis, simple regression analysis, and the partial derivative formula method, we examined the spatiotemporal variation of vegetation coverage in the OSL, belonging to the arid and semiarid region of northern China, and their interaction with climate-human factors. The results showed that the vegetation coverage of the area showed a downward trend with a rate of −0.0006/a during 2001–2017, and gradually decreased from east to west. Precipitation was the main climate factor controlling the overall distribution pattern of vegetation coverage, while the human factors had a more severe impact on the vegetation coverage than the climate factors in such a short period, and the overall impact was negative. Among the human factors, population pressure, urbanization, industrialization, pastoral production activities, and residents’ lifestyles had a negative impact. However, ecological restoration polices alleviated the contradiction between human development and vegetation deterioration. The results of this article provide a scientific basis for restoring grassland systems in arid and semi-arid areas

Sign in / Sign up

Export Citation Format

Share Document