scholarly journals ENSO elicits opposing responses of semi-arid vegetation between Hemispheres

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Anzhi Zhang ◽  
Gensuo Jia ◽  
Howard E. Epstein ◽  
Jiangjiang Xia
Keyword(s):  
Semi Arid ◽  
Arid Vegetation

Grass response to shrub removal in two semi-arid vegetation communities.

2000 ◽  
Vol 22 (2) ◽  
pp. 220 ◽  
Author(s):  
M Page ◽  
RJS Beeton ◽  
JJ Mott
Keyword(s):  
Key Words ◽  
Grazing Pressure ◽  
Grass Cover ◽  
Ecosystem Impacts ◽  
Vegetation Communities ◽  
Specific Research ◽  
Stable Component ◽  
South West ◽  
Semi Arid ◽  
Arid Vegetation

The control of woody weeds in the mulga lands of south-west Queensland is commonly regarded as essential for restoration of degraded systems. However, these shrubs have become a dominant and stable component of many mulga land ecosystems, and their removal may have unknown ecosystem impacts. This paper reports an experiment to determine the effect of woody weeds and grazing pressure on grass recruitment, cover and diversity in two vegetation communities in Queensland's mulga lands. Both factors influence grass recruitment, cover and diversity, but the response differs between the two vegetation communities investigated. The overall grass cover is consistently greater in sites where woody weeds were removed, and where grazing pressure was lowest. However, in the Dunefields community the cover and frequency of grass plants responded more to the removal of woody weeds than in the Mulga Sandplain community. In contrast, in the Mulga Sandplain community the grasses responded more to reducing or removing grazing pressure. Results suggest that subtle differences between systems influence grass dynamics, highlighting the need for community-specific research and management. Key words: shrub removal, semi-arid vegetation, vegetation communities, woody weeds

Evolutionary bi-objective optimization of a semi-arid vegetation dynamics model with NDVI and σ0 satellite data

2008 ◽  
Vol 112 (4) ◽  
pp. 1365-1380 ◽  
Author(s):  
S MANGIAROTTI ◽  
P MAZZEGA ◽  
L JARLAN ◽  
E MOUGIN ◽  
F BAUP ◽  
...  
Keyword(s):  
Satellite Data ◽  
Vegetation Dynamics ◽  
Dynamics Model ◽  
Semi Arid ◽  
Arid Vegetation

scholarly journals Object-based classification of semi-arid vegetation to support mine rehabilitation and monitoring

2014 ◽  
Vol 8 (1) ◽  
pp. 083564 ◽  
Author(s):  
Nisha Bao ◽  
Alex M. Lechner ◽  
Kasper Johansen ◽  
Baoying Ye
Keyword(s):  
Mine Rehabilitation ◽  
Object Based ◽  
Semi Arid ◽  
Arid Vegetation

A new species of Cyperus L. (Cyperaceae) from northeastern Brazil

Phytotaxa ◽  
2015 ◽  
Vol 204 (2) ◽  
pp. 153 ◽  
Author(s):  
André Rodolfo de Oliveira Ribeiro ◽  
MARCCUS ALVES ◽  
REGINA CÉLIA DE OLIVEIRA
Keyword(s):  
New Species ◽  
Northeastern Brazil ◽  
Perennial Species ◽  
Size Number ◽  
A New Species ◽  
Semi Arid ◽  
Arid Vegetation

A new species, Cyperus potiguar, is here described and illustrated. It is a perennial species morphologically related to C. alvesii and C. ligularis, but can be recognized by spikelet size, number and size of glumes, and length of rachilla internodes. It is found in the semi-arid vegetation of northeastern Brazil, locally called Caatinga.

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