scholarly journals The impact of land use on species composition and habitat structure in Sudanian savannas — A modelling study in protected areas and agricultural lands of southeastern Burkina Faso

Candollea ◽  
2016 ◽  
Vol 71 (2) ◽  
pp. 265-274 ◽  
Author(s):  
Marco Schmidt ◽  
Elisée Mbayngone ◽  
Yvonne Bachmann ◽  
Karen Hahn ◽  
Georg Zizka ◽  
...  
2016 ◽  
Vol 6 (1) ◽  
pp. 110 ◽  
Author(s):  
Sophie A. KIMA ◽  
A. A OKHIMAMHE ◽  
Andre KIEMA

<p class="1Body">Conversion of pastures to cropland is one of the most important issues facing livestock farming in Burkina Faso. This study examined the impact of land use/cover change on pastoral livestock farming in Boulgou province between 1980 and 2013. Landsat satellite images (1989, 2001 and 2013) and socio-economic data were analysed. The interpretation of the classified Landsat images revealed an increase in cropland from 20.5% in 1989 to 36.7% in 2013. This resulted mainly from the conversion of woody savannah and shrub and grass savannah to cropland. Pastoral livestock farmers reported that the major drivers of vegetation loss were drought (95.1 %), population growth (91.8%), cropland increase (91.4%), extraction of fuel wood (69.8%) and increase in livestock population (65.4). These changes affect livestock farming through reduction of pasture, poor access to water and reduction of livestock mobility routes according to the farmers. This calls for regional and national policies to protect grazing areas in Burkina Faso that are similar to policies being implemented for forest and other types of vegetation cover in other countries. For such pastoral policies to be successful, issues concerning the mobility of livestock farmers must be enshrined into such policies and this study is an example of information source for these policies.</p>


Mycorrhiza ◽  
2020 ◽  
Vol 30 (6) ◽  
pp. 749-759
Author(s):  
Zerihun Belay ◽  
Mesele Negash ◽  
Janne Kaseva ◽  
Mauritz Vestberg ◽  
Helena Kahiluoto

Abstract The rapid conversion of native forests to farmland in Ethiopia, the cradle of biodiversity, threatens the diversity of the arbuscular mycorrhizal fungi (AMF) pivotal to plant nutrition and carbon sequestration. This study aimed to investigate the impact of this land-use change on the AMF species composition and diversity in southern Ethiopia. Soil samples were collected from nine plots in each of three land-use types: native forest, agroforestry, and khat monocropping. The plots of the three land-use types were located adjacent to each other for each of the nine replicates. Three 10 × 10m subplots per plot were sampled. AMF spores were extracted from the soil samples, spore densities were determined, and species composition and diversity were evaluated through morphological analysis. Both spore density and species richness were statistically significantly higher in the native forest than in the agroforestry plots with no clear difference to khat, whereas the true diversity (exponential of Shannon–Wiener diversity index) did not differ among the three land-use types due to high evenness among the species in agroforestry. In total, 37 AMF morphotypes belonging to 12 genera in Glomeromycota were found, dominated by members of the genera Acaulospora and Glomus. The highest isolation frequency index (78%) was recorded for Acaulospora koskei from native forest. Consequently, the agroforestry system did not appear to aid in preserving the AMF species richness of native forests relative to perennial monocropping, such as khat cultivation. In contrast, the native forest areas can serve as in situ genetic reserves of mycorrhizal symbionts adapted to the local vegetative, edaphic, and microbial conditions.


1995 ◽  
Vol 170 (1-4) ◽  
pp. 123-135 ◽  
Author(s):  
Ian R. Calder ◽  
Robin L. Hall ◽  
Heidi G. Bastable ◽  
Henry M. Gunston ◽  
Osborne Shela ◽  
...  

Oryx ◽  
2012 ◽  
Vol 46 (3) ◽  
pp. 414-422 ◽  
Author(s):  
Brian D. Gerber ◽  
Sarah M. Karpanty ◽  
Johny Randrianantenaina

AbstractForest carnivores are threatened globally by logging and forest fragmentation yet we know relatively little about how such change affects predator populations. This is especially true in Madagascar, where carnivores have not been extensively studied. To understand better the effects of logging and fragmentation on Malagasy carnivores we evaluated species composition, density of fossa Cryptoprocta ferox and Malagasy civet Fossa fossana, and carnivore occupancy in central-eastern Madagascar. We photographically-sampled carnivores in two contiguous (primary and selectively-logged) and two fragmented rainforests (fragments <2.5 and >15 km from intact forest). Species composition varied, with more native carnivores in the contiguous than fragmented rainforests. F. fossana was absent from fragmented rainforests and at a lower density in selectively-logged than in primary rainforest (mean 1.38±SE 0.22 and 3.19±SE 0.55 individuals km−2, respectively). C. ferox was detected in fragments <2.5 km from forest and had similar densities in primary and selectively-logged forests (0.12±SE 0.05 and 0.09±SE 0.04 adults km−2, respectively) but was absent in fragments >15 km from forest. We identified only two protected areas in Madagascar that may maintain >300 adult C. ferox. Occupancy of broad-striped mongoose Galidictis fasciata was positively related to fragment size whereas occupancy of ring-tailed mongoose Galidia elegans elegans was negatively associated with increasing exotic wild cat (Felis spp.) activity at a camera site. Degraded rainforest fragments are difficult environments for Malagasy carnivores to occupy; there is a need to prioritize the reconnection and maintenance of contiguous forest tracts.


2019 ◽  
Vol 54 (3-4) ◽  
pp. 163-175
Author(s):  
Moussa Ganamé ◽  
Philippe Bayen ◽  
Issaka Ouédraogo ◽  
Kangbéni Dimobe ◽  
Adjima Thiombiano

2021 ◽  
Author(s):  
H Dadashpoor ◽  
Hossein Panahi

Spatial simulation of land-use change scenarios in metropolitan areas is essential for analyzing both the causes and consequences of various future scenarios and is also valuable for land-use planning and management. However, current simulation models primarily focus on spatial and rarely on quantitative driving factors. This article aims to simulate future scenarios of land-use changes in the Tehran metropolitan region (TMR) by combining different models to fill this gap. Thus, in the first step, land-use changes were analyzed in the period 1985, 2000, and 2015. Then, by identifying the impact of driving factors and land-use transition potentials with Logistic regression (LR), land-use changes were allocated using the Cellular Automata (CA) method. Finally, with the validation of the model, four scenarios of the current trend(CT), socioeconomic growth(SEG), ecological-oriented(EO), and integrated development(ID) were suggested with the combination of the System Dynamic (SD) model. The results show that the trend of land-use changes in TMR has led to the destruction of grassland, agricultural, and uncultivated lands and the continuation of this trend will increase the damage of built-up areas on valuable natural and ecological resources. In this way, proximity to roads, distance from built-up areas, and natural factors had the greatest impact on changes. Based on future scenarios in 2030, the change in the SEG-scenario shows a rapid increase in built-up areas (2858km and encroachment on agricultural lands (2171km . In the EO-scenario, destruction of grassland and agricultural lands and the growth of built-up areas will be limited, while CT-scenario leads to the high growth of built-up areas along with destructive impacts on natural and open spaces. In the ID-scenario, the built-up areas and grasslands will increase to 2808km and 7438km , respectively. Accordingly, policy-makers can use simulation of different scenarios to mitigate probable consequences of land-use changes in the metropolitan regions. 2) 2) 2 2


2021 ◽  
pp. 805-814
Author(s):  
V.V. Alakoz

The article examines the system of agricultural land use and the impact of its elements on in-country spatial heterogeneity, and the spatial development of agricultural land use in the regional aspect – the expansion or contraction of arable lands. The geographic space of the agricultural land use of a country, a macro-region, a region-component of the agricultural industry and the socio-economic system of life are quantitative and qualitative changes in the use of the existing potential of productive agricultural lands, an increase or decrease of their boundaries under the combined influence of social, economic, institutional and infrastructural elements of the agricultural land use system. Among the elements of this system that affect the expansion or contraction of the area and boundaries of agricultural land use and their quality condition: bioclimatic potential; the level of innovative development, agricultural technologies; access to land, finance, and sales markets; effective demand for agricultural products; availability of development institutions (land information systems, monitoring of land use, land management, cadastre, land valuation, land redistribution fund - land bank). Decisive importance is the quality of state regulation of land relations (land and tax legislation) and state management of land use, and the topic of this article - the quality and level of state support for agricultural activities. The harmonization of the components of the agricultural land administration system is decision which, how and how much apply one or another regulation factor of land relations – the mechanisms of market self-regulation or direct state regulation.


1994 ◽  
Vol 21 (1) ◽  
pp. 49-56 ◽  
Author(s):  
S. Robert Aiken

As in other former British colonies, the earliest protected areas in Peninsular Malaysia were game reserves. There were twenty protected areas at the end of the colonial period (1957), and twenty-five in 1992. The outstanding achievement of the colonial period was the creation of King George V National Park (now Taman Negara), but unfortunately too much reliance was subsequently placed upon it. Protected areas were established in economically undesirable or (formerly) remote areas, largely on an ad hoc basis and mainly as a kind of ‘residual’ land-use. The protected areas have long suffered from rescissions, excisions, and encroachments, primarily for three reasons: because commercial interests have always prevailed; because of insecurity of land tenure; and because ordinary people have been denied a stake in such areas.I estimate that the ‘effective’ protected-area coverage in 1992 was probably no greater than that of about AD 1940 (when, unlike the situation today, most of the Peninsula still remained forested). The Malaysian states have been reluctant to create new protected areas, and the federal government has been unwilling to invoke certain of its constitutional powers in order to acquire state lands for national parks. Consequently, proposals for additional protected areas have produced few results. Yet owing to the rapid pace of anthropogenic forest change, the Peninsula is running out of potential sites for new protected ares.Reserved forests comprise virtually all of the Peninsula's remaining forest cover (see Fig. 1). Set aside mainly for productive and protective purposes, it is these forests, not the protected areas, that harbour most of the region's wildlife. This being the case, and keeping in mind that almost all of the wild species are forest-dwelling, it follows that wildlife conservation must come to rely more and more heavily on the reserved forests. Studies conducted by Johns (e.g. 1983, 1986, 1987) at Sungai Tekam, Pahang, on the impact of logging on wildlife, reveal that most species can adapt to the altered conditions of logged forests; or, more precisely, that this appears to be the case following a single logging operation. But this topic, interesting and important as it is, takes us beyond the scope of this paper.The matter of species adaptability, however, brings to mind a more general theme, which is the need to implement the principles of conservation everywhere, not just in specially protected areas. There is, in short, no effective alternative to rational land-use planning and to making conservation an integral part of all production processes.


2008 ◽  
Vol 11 ◽  
pp. 17-24 ◽  
Author(s):  
Salifou Traoré ◽  
Jeanne Millogo Rasolodimby ◽  
Lamourdia Thiombiano ◽  
Sita Guinko

Regeneration success, persistence strategies (seedlings vs. coppicing), and population trend of Acacia spp. were tested under two land-use regimes in eastern Burkina Faso: (i) protected areas shielded to livestock grazing pressure, to logging, and using early annual fire as a management system; (ii) areas with high human impact (heavily and extensive livestock grazing, harvesting for wood and for medicinal plants). Generally, a good regeneration rate of Acacia species was observed in protected areas and a poor regeneration rate in areas with high human impact. Nevertheless, some species affiliated to the subgenus Aculeiferum as A. dudgeoni and A. polyacantha showed a good regeneration under both land use regimes. Juvenile plants less than 25 cm height of A. dudgeoni and A. gourmaensis increased by 116 to 50 % in areas with human impact as compared to their populations in protected areas. With SCD slopes varying from –0.40 to -0.70, the protected Acacia woodland displayed a stable population structure due to abundance of recruitment, and coppicing persistence (more common in the subgenus Aculeiferum) favoured by early annual fire. Consequently, the protected areas are favourable for Acacia woodland regeneration. Conversely, SCD slopes are positive or close to zero in areas of anthropogenic regime and showed a declining population, especially more marked with the subgenus Acacia due to permanent seed and seedling removal by livestock grazing. Nevertheless, the number of seedlings of some species was higher in areas under human pressure than in protected areas, especially for the subgenus Aculeiferum, improving the genetic variability and thus the long-term maintenance of the population


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