Profiles of innovators in a semi-arid smallholder agricultural environment in south west Zimbabwe

2017 ◽  
Vol 100 ◽  
pp. 325-335 ◽  
Author(s):  
Eness P. Mutsvangwa-Sammie ◽  
Emmanuel Manzungu ◽  
Shephard Siziba
Keyword(s):  
Agricultural Environment ◽  
South West ◽  
Semi Arid

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

The influence of mistletoes on nitrogen cycling in a semi-arid savanna, south-west Zimbabwe

2013 ◽  
Vol 29 (2) ◽  
pp. 147-159 ◽  
Author(s):  
Hilton G. T. Ndagurwa ◽  
John S. Dube ◽  
Donald Mlambo
Keyword(s):  
Soil Nutrient ◽  
Nutrient Concentrations ◽  
Ecosystem Structure ◽  
Soil N ◽  
Mineral N ◽  
N Transformations ◽  
South West ◽  
Tree Canopies ◽  
Ecosystem Structure And Functioning ◽  
Semi Arid

Abstract:This study investigated the effects of mistletoe infection on N cycling in a semi–arid savanna, south-west Zimbabwe. We established five plots (10 × 10 m) which each included three large canopy-dominantAcacia karrootrees infected by one of three mistletoes (Erianthemum ngamicum,Plicosepalus kalachariensisandViscum verrucosum) and non-infectedA. karrootrees. In each plot, we measured litterfall, litter quality (N, phenolics, tannins and lignin), soil nutrient concentrations and N transformations beneath tree canopies. Soil N, P and Ca were greatest beneath trees infected byP.kalachariensisthan beneath non-infected trees. Litterfall and litter N returns were 1.5, 2 and 1.4 times more beneathA. karrootrees infected byE.ngamicum,P.kalachariensisandV. verrucosum, respectively. Mineral N increased with mistletoe infection but did not exceed 20%. Soil N transformations were greater beneath trees infected byE.ngamicum(> 40%), and lower beneath trees infected byP.kalachariensis(<50%) andV.verrucosum(<48%) than beneath non-infectedA. karrootrees. Soil N transformations were negatively correlated with condensed tannins, lignin and lignin : N. We conclude that the improved N concentration can increase resource heterogeneity, which may alter the ecosystem structure and functioning in the semi-arid savanna.

Use of mistletoes by the Grey Go-away-bird (Corythaixoides concolor , Musophagidae) in a semi-arid savannah, south-west Zimbabwe

2016 ◽  
Vol 54 (3) ◽  
pp. 336-341 ◽  
Author(s):  
Hilton G. T. Ndagurwa ◽  
Elizabeth Nyawo ◽  
Justice Muvengwi
Keyword(s):  
South West ◽  
Semi Arid

scholarly journals The role of surface water redistribution in an area of patterned vegetation in a semi-arid environment, south-west Niger

1997 ◽  
Vol 198 (1-4) ◽  
pp. 1-29 ◽  
Author(s):  
J. Bromley ◽  
J. Brouwer ◽  
A.P. Barker ◽  
S.R. Gaze ◽  
C. Valentine
Keyword(s):  
Surface Water ◽  
Arid Environment ◽  
South West ◽  
Water Redistribution ◽  
Semi Arid

scholarly journals Multiple ecological processes underpin the eruptive dynamics of small mammals: House mice in a semi‐arid agricultural environment

2020 ◽  
Vol 10 (7) ◽  
pp. 3477-3490
Author(s):  
Peter R. Brown ◽  
Anthony D. Arthur ◽  
Dean A. Jones ◽  
Micah J. Davies ◽  
David Grice ◽  
...  
Keyword(s):  
Small Mammals ◽  
House Mice ◽  
Ecological Processes ◽  
Agricultural Environment ◽  
Eruptive Dynamics ◽  
Semi Arid

scholarly journals Groundwater Flow Modeling by Using the Permeability Induced by Satellite Lineaments in Discontinuous Aquifers and Semi-Arid Context: A Case Study of the Liptako Region (South-West of Niger)

2019 ◽  
Vol 11 (08) ◽  
pp. 1090-1109
Author(s):  
Saidou Garba Inaytoulaye ◽  
Youssouf Koussoube ◽  
Abdel Kader Hassane Saley ◽  
Issoufou Sandao ◽  
Paul Hayes ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Flow Modeling ◽  
Groundwater Flow Modeling ◽  
South West ◽  
Semi Arid

scholarly journals Characterization of recharge mechanisms in a Precambrian basement aquifer in semi-arid south-west Niger

2018 ◽  
Vol 27 (2) ◽  
pp. 475-491 ◽  
Author(s):  
Maman Sani Abdou Babaye ◽  
Philippe Orban ◽  
Boureima Ousmane ◽  
Guillaume Favreau ◽  
Serge Brouyère ◽  
...  
Keyword(s):  
Precambrian Basement ◽  
South West ◽  
Semi Arid

scholarly journals MULTIPLE SPATIAL CHANGES IN THE ARGAN ECOSYSTEM- (Argania spinosa (L.) Skeels) - CASE STUDY (MOROCCO)

2021 ◽  
pp. 4-12
Author(s):  
Said LAARIBYA
Keyword(s):  
Aerial Photography ◽  
Forest Degradation ◽  
National Forest Inventory ◽  
Forest Area ◽  
National Forest ◽  
Argania Spinosa ◽  
South West ◽  
Spatial Changes ◽  
Semi Arid

Argania spinosa L. endemic to Morocco, is a multipurpose tree with an important socio-economic and ecological interest. The study was carried out in an Argan forest Laqliaa municipality, South West Morocco, which is located in semi-arid bioclimatic region. The objective is to present a diagnosis for the state and dynamics of forest degradation through cartography, GIS and socioeconomic analyses between two periods (1986-2018). For this purpose, we analyzed and estimated all multiple change in the forest area surfaces. The method used is based on the comparison of two digital forest map files from the National Forest Inventory (1986 mission) and from the most recent aerial photography (2018).The cartographic analysis of the spatial forest area and socio-economic dynamics revealed a regressive dynamic of change resulting from agriculture under Argan forest, urbanization, human and pastoral pressure. The rescue and restoration of the Argan forest remains conditional on vigorous actions in time and space and especially in the duration of sustainable development.

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