Molecular and physiological bacterial diversity of a semi-arid soil contaminated with different levels of formulated atrazine

2006 ◽  
Vol 34 (2-3) ◽  
pp. 93-102 ◽  
Author(s):  
M. Ros ◽  
M. Goberna ◽  
J.L. Moreno ◽  
T. Hernandez ◽  
C. García ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
Arid Soil ◽  
Different Levels ◽  
Semi Arid

Agriculture expansion and deforestation in seasonally dry forests of north-west Argentina

2005 ◽  
Vol 32 (2) ◽  
pp. 140-148 ◽  
Author(s):  
H. RICARDO GRAU ◽  
N. IGNACIO GASPARRI ◽  
T. MITCHELL AIDE
Keyword(s):  
Global Trends ◽  
North West ◽  
Conservation Policies ◽  
Seasonally Dry ◽  
The North ◽  
Agriculture Expansion ◽  
Soybean Price ◽  
Different Levels ◽  
Semi Arid ◽  
Arid Chaco

In Argentina, deforestation due to agriculture expansion is threatening the Semi-arid Chaco, one of the largest forested biomes of South America. This study focuses on the north-west boundary of the Argentine Semi-arid Chaco, where soybean is the most important crop. Deforestation was estimated for areas with different levels of soil and rainfall limitation for agriculture between 1972 and 2001, with a finer analysis in three periods starting in 1984, which are characterized by differences in rainfall, soybean price, production cost, technology-driven yield and national gross domestic product. Between 1972 and 2001, 588 900 ha (c. 20% of the forests) were deforested. Deforestation has been accelerating, reaching >28 000 ha yr−1 after 1997. The initial deforestation was associated with black bean cultivation following an increase in rainfall during the 1970s. In the 1980s, high soybean prices stimulated further deforestation. Finally, the introduction of soybean transgenic cultivars in 1997 reduced plantation costs and stimulated a further increase in deforestation. The domestic economy had little association with deforestation. Although deforestation was more intense in the moister (rainfall >600 mm yr−1) areas, more than 300 000 ha have already been deforested in the drier areas, suggesting that climatic limitations are being overcome by technological and genetic improvement. Furthermore, more than 300 000 ha of forest occur in sectors without major soil and rainfall limitations. If global trends of technology, soybean markets and climate continue, and no active conservation policies are applied, vast areas of the Chaco will be deforested in the coming decades.

scholarly journals Unravelling the bacterial diversity found in the semi-arid Tablas de Daimiel National Park wetland (central Spain)

2010 ◽  
Vol 59 ◽  
pp. 33-44 ◽  
Author(s):  
G D’Auria ◽  
MM Barón-Rodríguez ◽  
A Durbán-Vicente ◽  
A Moya ◽  
C Rojo ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
National Park ◽  
Central Spain ◽  
Semi Arid

Aspergillus fuscicans (Aspergillaceae, Eurotiales), a new species in section Usti from Argentinean semi-arid soil

Phytotaxa ◽  
2018 ◽  
Vol 343 (1) ◽  
pp. 67 ◽  
Author(s):  
STELLA M. ROMERO ◽  
RICARDO M. COMERIO ◽  
VIVIANA A. BARRERA ◽  
ANDREA I. ROMERO
Keyword(s):  
New Species ◽  
Sequence Analysis ◽  
Sequence Data ◽  
Arid Soil ◽  
Physiological Studies ◽  
A New Species ◽  
Semi Arid ◽  
Aspergillus Section ◽  
Β Tubulin

Aspergillus fuscicans, a new species within Aspergillus section Usti from Argentinean semi-arid soil is introduced. Molecular, morphological and physiological studies were conducted, based on sequence analysis of partial β-tubulin and calmodulin sequence data. Aspergillus fuscicans formed a distinct, well-defined clade related to A. calidoustus and A. pseudodeflectus. In addition, A. fuscicans was able to grow and sporulate at 37 ºC, and had a negative Ehrlich reaction. Morphological and physiological features could be used to differentiate the new species from its phylogenetically related taxa.

Relationship between the Agricultural Management of a Semi‐arid Soil and Microbiological Quality

2008 ◽  
Vol 39 (3-4) ◽  
pp. 421-439 ◽  
Author(s):  
José L. Moreno ◽  
Felipe Bastida ◽  
Teresa Hernández ◽  
Carlos García
Keyword(s):  
Microbiological Quality ◽  
Agricultural Management ◽  
Arid Soil ◽  
Semi Arid

Movement of salts in isolated soil columns.

1953 ◽  
Vol 4 (1) ◽  
pp. 82 ◽  
Author(s):  
ES West ◽  
A Howard
Keyword(s):  
Water Table ◽  
Salt Concentration ◽  
Sandy Loam ◽  
Field Conditions ◽  
Lateral Movement ◽  
Soil Columns ◽  
Surface Layers ◽  
Salt Accumulation ◽  
Arid Soil ◽  
Semi Arid

Movement of salt in a semi-arid soil (Hanwood sandy loam) was studied in isolated columns of soil one metre in diameter and four metres deep. Where a water-table was maintained approximately 60 cm. from the surface by the addition of rain-water to the surface, salt was washed out of the surface layers and did not return. Where a water-table was maintained one metre from the surface by the addition of water from below there was a small increase in the salt concentration of the surface 10 cm. of soil. In view of these results it is suggested that some circulation of water involving lateral movement is generally associated with salt accumulation that is commonly found under field conditions.

Sign in / Sign up

Export Citation Format

Share Document