News Update on Land Use : April 21

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News Update on Land Use : April 21

April 19, 2021 Soil Science 0

[1] Global Consequences of Land Use

Land use has generally been considered a local environmental issue, but it is becoming a force of global importance. Worldwide changes to forests, farmlands, waterways, and air are being driven by the need to provide food, fiber, water, and shelter to more than six billion people. Global croplands, pastures, plantations, and urban areas have expanded in recent decades, accompanied by large increases in energy, water, and fertilizer consumption, along with considerable losses of biodiversity. Such changes in land use have enabled humans to appropriate an increasing share of the planet’s resources, but they also potentially undermine the capacity of ecosystems to sustain food production, maintain freshwater and forest resources, regulate climate and air quality, and ameliorate infectious diseases. We face the challenge of managing trade-offs between immediate human needs and maintaining the capacity of the biosphere to provide goods and services in the long term.

[2] Predicting land-use change

Land use change modelling, especially if done in a spatially-explicit, integrated and multi-scale manner, is an important technique for the projection of alternative pathways into the future, for conducting experiments that test our understanding of key processes in land use changes. Land-use change models should represent part of the complexity of land use systems. They offer the possibility to test the sensitivity of land use patterns to changes in selected variables. They also allow testing of the stability of linked social and ecological systems, through scenario building. To assess current progress in this field, a workshop on spatially explicit land-use/land-cover models was organised within the scope of the Land-Use and Land Cover Change project (LUCC). The main developments presented in this special issue concern progress in: 1) Modelling of drivers of land-use change; 2) modelling of scale dependency of drivers of land use change; 3) modelling progress in predicting location versus quantity of land-use change; 4) the incorporation of biophysical feedbacks in land-use change models.

[3] How Accessibility Shapes Land Use

An empirical examination of the residential development patterns illustrates that accessibility and the availability of vacant developable land can be used as the basis of a residential land use model. The author presents an operational definition and suggests a method for determining accessibility patterns within metropolitan areas. This is a process of distributing forecasted metropolitan population to small areas within the metropolitan region. Although the model presented is not yet sufficiently well refined for estimating purposes, the concept and the approach may be potentially useful tools for metropolitan planning purposes.

[4] Impact of Different Types of Land Use on Pattern of Herbaceous Plant Community in the Nigerian Northern Guinea Savanna

This study was carried out with the aim of finding the pattern of distribution and composition of herbaceous plant with respect to different types of land use in the Nigerian Northern Guinea Savannah. Data on plant species was collected using quadrat. Soil sample was collected using core and analyzed for physicochemical properties. The soil physicochemical properties include Total Nitrogen (%), Available Phosphorus (mg/ kg-1), Exchangeable Potassium (cmol (+)/ kg-1), PH, Organic Carbon (%) and Soil textural class. Different effects of land use, which include trampling, arable cultivation, grazing and mowing affected the floristic structure of plant community and soil physicochemical properties in different ways. Each land use type creates a uniquely different type of plant community. Greater impact on the plant community structure was by trampling and cultivation and lesser grazing and mowing.

[5] Soil Quality Assessment for Sustainable Land Use and Management

Tropical soils are generally fragile and hence highly degraded due to such factors as low organic matter content, dominance of low activity clay, high susceptibility to erosion etc. Coupled with this, there is population pressure on the limited land and this has become a great challenge for land management and agricultural production. It is therefore imperative to adopt science-based and efficient approach for monitoring the impact of land use on land resources. This study has assessed soil quality under two land use types to establish the effect of land use on soil quality and demonstrate the kind of assessment necessary to arrest land degradation before it progresses too far. It was conducted within Oluyole Local Government Area in Oyo State, Southwestern Nigeria under two agricultural land use types (cacao and maize). For each of the two land uses, two farmlands were chosen for the study. In each of the farmlands, five sampling points were located and soil samples were collected at 0 – 15 cm and 15 – 30 cm depths. The samples were processed and analyzed for selected indicators, following standard methods. Soil quality was assessed using Soil Management Assessment Framework.

Reference

[1] Foley, J.A., DeFries, R., Asner, G.P., Barford, C., Bonan, G., Carpenter, S.R., Chapin, F.S., Coe, M.T., Daily, G.C., Gibbs, H.K. and Helkowski, J.H., 2005. Global consequences of land use. science309(5734), pp.570-574.

[2] Veldkamp, A. and Lambin, E.F., 2001. Predicting land-use change.

[3] Hansen, W.G., 1959. How accessibility shapes land use. Journal of the American Institute of planners25(2), pp.73-76.

[4] Buba, T., 2015. Impact of different types of land use on pattern of herbaceous plant community in the Nigerian Northern Guinea Savanna. Journal of Agriculture and Ecology Research International, pp.151-165.

[5] Adeyolanu, O.D. and Ogunkunle, A.O., 2017. Soil quality assessment for sustainable land use and management. International Journal of Plant & Soil Science, pp.1-11.

 

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