Ahmed Laamrani

Ahmed Laamrani
Mohammed VI Polytechnic University (UM6P) · Center for Remote Sensing Applications (CRSA)

Professor

About

60
Publications
7,555
Reads
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265
Citations
Citations since 2016
38 Research Items
227 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
Additional affiliations
April 2017 - March 2019
University of Guelph
Position
  • Researcher
January 2014 - August 2016
Government of Canada, Guelph, Canada
Position
  • Remote Sensing & GIS Specialist
September 2004 - June 2014
Université du Québec en Abitibi-Témiscamingue
Position
  • Research professional in Remote Sensing and GIS

Publications

Publications (60)
Article
Full-text available
The geosciences suffer from a lack of large georeferenced datasets that can be used to assess and monitor the role of soil organic carbon (SOC) in plant growth, soil fertility, and CO2 sequestration. Publicly available, large field-scale georeferenced datasets are often limited in number and design to serve these purposes. This study provides the f...
Article
Soil carbon is a key soil property that regulates numerous soil processes and affects soil chemical, physical and biological properties. Given its importance, prediction of soil carbon using digital soil mapping (DSM) techniques has seen increased interest at scales ranging from global to local. The accuracy of predictive models is reliant on sampl...
Article
Full-text available
Demand for agricultural products is increasing as population continues to grow in Africa. To attain a higher crop yield while preserving the environment, appropriate management of macronutrients (i.e., nitrogen (N), phosphorus (P) and potassium (K)) and crops are of critical prominence. This paper aims to review the state of art of the use of remot...
Article
Full-text available
Africa has the largest population growth rate in the world and an agricultural system characterized by the predominance of smallholder farmers. Improving food security in Africa will require a good understanding of farming systems yields as well as reducing yield gaps (i.e., the difference between potential yield and actual farmer yield). To this e...
Article
Full-text available
Accurate yield estimation and optimized agricultural management is a key goal in precision agriculture, while depending on many different production attributes, such as soil properties, fertilizer and irrigation management, the weather, and topography.The need for timely and accurate sensing of these inputs at the within field-scale has led to incr...
Conference Paper
This study aims to establish a quantitative framework for soil nitrogen (N), phosphorus (P), and potassium (K) availability in crop fields, using hyperspectral remote sensing imagery and 30m resolution landmark map charting soil fertility across the whole of Africa that has been recently developed by a group of international scientists (iSDA soil)....
Preprint
Mapping of carbonatites and related mineral deposits has occupied prominent place in mineral resource exploration programs given their potential to host valuable concentrations of critical metals such as rare earth elements and niobium. Based on spectral characteristics of most indicative minerals for these rocks, a mapping approach was developed u...
Article
Full-text available
Changing land use patterns is of great importance in environmental studies and critical for land use management decision making over farming systems in arid and semi-arid regions. Unfortunately, ground data scarcity or inadequacy in many regions can cause large uncertainties in the characterization of phenological changes in arid and semi-arid regi...
Article
Visible, near-infrared and short wave infrared (VNIR/SWIR, 400–2500 nm) remote sensing imagery is a useful tool for topsoil property mapping, but limited to bare soils pixels. With the increasing amount of freely available VNIR/SWIR satellite imagery (e.g. Landsat TM, ETM+, OLI and Sentinel-2A/B), extensive time series data can be exploited to incr...
Article
Full-text available
Northern boreal forests are characterized by accumulation of accumulation of peat(e.g., known as paludification). The functioning of northern boreal forest species and their capacity to adapt to environmental changes appear to depend on soil conditions. Climate warming is expected to have particularly pronounced effects on paludified boreal ecosyst...
Article
Full-text available
The impacts of tillage practices and crop rotations are fundamental factors influencing changes in the soil carbon, and thus the sustainability of agricultural systems. The objective of this study was to compare soil carbon status and temporal changes in topsoil from different 4 year rotations and tillage treatments (i.e., no-till and conventional...
Article
Full-text available
Growing cover or winter crops and retaining crop residue on agricultural lands are considered beneficial management practices to address soil health and water quality. Remote sensing is a valuable tool to assess and map crop residue cover and cover crops. The objective of this study is to evaluate the performance of linear spectral unmixing for est...
Article
Full-text available
The accumulation of organic material on top of the mineral soil over time (a process called paludification) is common in Northern Boreal coniferous forests. This natural process leads to a marked decrease in forest productivity overtime. Topography both at the surface of the forest floor (i.e., above ground) and the subsurface (i.e., top of mineral...
Conference Paper
Full-text available
Spatial prediction of paludification in black spruce stand is of particular importance in forest management given its negative effect on forest productivity. In northern boreal ecosystems, paludification is defined as the accumulation of partially decomposed organic matter over saturated mineral soils, thus reducing tree regeneration and forest gro...
Article
Full-text available
The recent use of hyperspectral remote sensing imagery has introduced new opportunities for soil organic carbon (SOC) assessment and monitoring. These data enable monitoring of a wide variety of soil properties but pose important methodological challenges. Highly correlated hyperspectral spectral bands can affect the prediction and accuracy as well...
Article
Soil data and soil mapping are indispensable tools in sustainable forest management. In northern boreal ecosystems, paludification is defined as the accumulation of partially decomposed organic matter over saturated mineral soils, a process that reduces tree regeneration and forest growth. Given this negative effect on forest productivity, spatial...
Article
In northern boreal ecosystems, paludification is defined as the accumulation of partially decomposed organic matter over saturated mineral soils, a process that reduces tree regeneration and forest growth. Given this negative effect on forest productivity, spatial prediction of paludification in black spruce stands is important in forest management...
Article
Full-text available
Quantifying the amount of crop residue left in the field after harvest is a key issue for sustainability. Conventional assessment approaches (e.g., line-transect) are labor intensive, time-consuming and costly. Many proximal remote sensing devices and systems have been developed for agricultural applications such as cover crop and residue mapping....
Article
Crop residue left after harvest plays an important role in controlling against soil erosion and in increasing soil organic matter content of agricultural soils. Crop residue management is a practice of great importance in southwestern Ontario, where soil management practices have an effect on Great Lakes water quality. The use of remote sensing dat...
Conference Paper
Soil organic carbon (SOC) has an important effect in plant growth, soil fertility, and CO2 sequestration. The level of SOC in agricultural soil is the key factor regulating soil health as it directly benefits soil physical, chemical and biological properties. It determines the ability of soil to function in maintaining plant productivity, water and...
Conference Paper
Information about crop residue cover and tillage practices is important to support policy and program implementation. There is particular interest in the management of agricultural land in the Lake Erie basin during the non-growing season as this is when most of the non-point source nutrient run-off and loading to the lake occur. Both crop residue...
Conference Paper
The black spruce forests in north eastern Canada are considered as a potential source of wood fibre. However, a considerable volume of timber in this region is located in areas that are prone to gradual accumulation of surface organic matter deposits over time (paludifi cation). Paludification is a natural process where organic material accumulates...
Article
Full-text available
Boreal black spruce (Picea mariana) forests are prone to developing thick organic layers (paludification). Black spruce is adapted to this environment by the continuous development of adventitious roots, masking the root collar and making it difficult to age trees. Ring counts above the root collar underestimate age of trees, but the magnitude of a...
Article
In Quebec, reforestation by means of coniferous plantation began in the early 1980 and peaked in 1990. However, one wonders if these efforts bore fruits given the high degree of vegetation competition encountered in some plantations. The study objectives were to evaluate and compare changes in forest cover of coniferous plantations established sinc...
Article
Northern Canadian boreal forest is characterised by accumulation of a thick organic soil layer (paludification). Two types of paludification are recognised on the basis of topography and time since the last fire, viz., permanent paludification that dominates in natural depressions within the landscape, and reversible paludification that occurs on f...
Article
Mineral soil topography is difficult to describe in boreal regions because of the thick overlying organic layer despite its presumed importance in determining where and at what rate an organic layer will accumulate (paludification). The overall purpose of this study was to examine the relationship between mineral soil topography and OLT at the land...
Article
Full-text available
The aim of this study was to quantitatively investigate the relationship between topographic variables and organic layer thickness (OLT) and to use these relationships for mapping OLT distributions at the landscape scale within the paludified boreal forests of eastern Canada. Topography was quantified by a set of predictor variables (slope, elevati...
Thesis
RÉSUMÉ La forêt boréale canadienne a une importance écologique et économique considérable. Toutefois, les forêts d'épinettes noires situées dans la ceinture d'argile, une région boréale de l'est de l'Amérique du Nord, sont sujettes à la paludification. Ce phénomène est un processus naturel par lequel une couche organique s'accumule sur le sol fores...
Article
Black spruce forests that are located in the Clay Belt, within the boreal region of eastern North America, are prone to paludification. Paludification is a natural process where organic layer accumulates on the forest floor, leading to substantial decreases in forest productivity. This study assessed the ability of using ground penetrating radar (G...
Conference Paper
Full-text available
Black spruce forests located in the Clay Belt, a region of eastern North America, are characterized by a decline in forest productivity and are prone to paludification (Fenton et al. 2005; Lavoie et al. 2005). Paludification is a natural process where organic material accumulates on the forest floor leading to a marked decrease in forest productivi...
Article
Full-text available
Multitemporal classification of Landsat imagery was used to measure and monitor the state of the forest over a large area (11.6 million ha) of boreal forest in eastern Canada using four criteria for a 20 year period (1985�2005). The Enhancement-Classification Method was used in this study. Forty-eight thematic classes based on Canada’s National For...
Technical Report
Full-text available
La forêt représente l’une de nos plus grandes richesses naturelles. Il s’agit d’une ressource renouvelable mais qui est sensible aux pressions telles que la colonisation, la mécanisation des opérations forestières et l’explosion démographique à l’échelle de la planète. Même si la forêt était jadis considérée comme une ressource inépuisable, déjà au...
Data
Full-text available
La forêt représente l’une de nos plus grandes richesses naturelles. Il s’agit d’une ressource renouvelable mais qui est sensible aux pressions telles que la colonisation, la mécanisation des opérations forestières et l’explosion démographique à l’échelle de la planète. Même si la forêt était jadis considérée comme une ressource inépuisable, déjà au...
Article
This study uses reflectance spectroscopy to examine cores of hydrothermally altered carbonate facies within the North Trend, Pine Point mining camp. Four alteration types were constrained to specific facies in Pine Point, Sulphur Point, and Windy Point formations. These alteration types, each having a unique spectral signature, are: white dolomite,...
Article
Thèse (M. Sc. A.)--Université du Québec à Chicoutimi, 1999. Comprend des réf. bibliogr.

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Projects

Project (1)
Project
Northern Canadian boreal forest is characterised by accumulation of thick soil organic layer (paludification).Paludification transforms productive forests into unproductive forested peatlands and substantial losses of wood fibre in the boreal forest. Accurate mapping of paludification is required for land resource management. Such information is useful where investment after harvesting should help to achieve greater productivity.