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Issuesutilisation des terresLandLibrary Resource
There are 9, 789 content items of different types and languages related to utilisation des terres on the Land Portal.
Displaying 3901 - 3912 of 4598

Soil microbial biomass in semi-arid-communal sandy rangelands in the Western Bophirima district, South Africa

Journal Articles & Books
Décembre, 2007
Afrique du Sud
Afrique australe

Soil microbial biomass is considered as an important early indicator of changes that may occur
in the long term with regard to soil fertility and constitutes an important source and sink of nutrients. In
South Africa, rangeland monitoring has mostly focused on assessing changes of aboveground vegetation
in response to land uses effects, but the associated changes at belowground soil level remain a topic of
further research. The aim of this study was to explore soil microbial biomass at three sites under

Soil macrofauna under integrated crop-livestock systems in a Brazilian Cerrado Ferralsol

Journal Articles & Books
Décembre, 2009
Brésil
Amérique du Sud

The objective of this work was to assess the effects of integrated crop-livestock systems, associated
with two tillage and two fertilization regimes, on the abundance and diversity of the soil macrofauna. Four
different management systems were studied: continuous pasture (mixed grass); continuous crop; two croplivestock
rotations (crop/pasture and pasture/crop); and native Cerrado as a control. Macrofauna was sampled
using a modified Tropical Soil Biology and Fertility method, and all individuals were counted and identified at

Soil organic carbon stocks in semi-arid West African drylands: implications for climate change adaptation and mitigation

Journal Articles & Books
Juillet, 2016
Afrique
Afrique occidentale

In the West African drylands, SOC sequestration is seen as one of the prominent strategies to both enhance the resilience of agro-ecosystems and mitigate global greenhouse effects. However, there is a dearth of baseline data that impede the design of site-appropriate recommended management practices (RMPs) to improve and sustain SOC accrual.

Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados

Journal Articles & Books
Décembre, 1999
Brésil
Amérique centrale
Amérique du Sud

Intensive farming and grazing on Oxisols of the Brazilian savannas (also known as the Cerrados) are leading to loss of soil organic matter (SOM) and consequently to a decline in fertility and sustainability of the soils. Alternative land-use systems such as the introduction of legumes in pastures and the use of no-tillage systems can reverse this process.

Spatial identification by satellite imagery of the crop–fallow rotation cycle in northern Laos

Journal Articles & Books
Décembre, 2009
Laos
Asia du sud-est

In the mountainous regions of northern Laos, shifting cultivation, or slash-and-burn agriculture, is widely practiced. However, the crop–fallow rotation cycle is becoming shorter owing to forest conservation policies and population pressure, causing loss of productivity that deleteriously affects farmers’ livelihoods in the region. To investigate regional land use conditions, we have developed a method of identifying the crop–fallow rotation cycle from Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper+ (ETM+) data.