Louis Pierre Comeau

Agriculture and Agri-Food Canada | AAFC · Fredericton Research and Development Centre

Soil respiration measurements are commonly used as soil health indicators. Several ex-situ soil respiration methods exist, but comparative performances between them have rarely been analyzed. Specifically, there is a lack of comparisons between intact microcosms and destructive methods. The objective of this study was to analyze and compare three d...

Rock pulverization is recommended when converting boreal forests to agricultural land use to facilitate tillage operations. Resulting rock dust incorporation might alter physical, chemical, and biological properties of soils. We assessed soil nematode trophic group abundances and indices, basal and burst respiration, and phosphorus extractability a...

Biofumigation has been proposed as an alternative to soil fumigation to manage soil-borne diseases including potato early dying disease complex (PED). This study examined the potential of using brown mustard (Mustard juncea) biofumigation to manage PED under rain-fed potato production in New Brunswick, Canada in two trials between 2017 and 2020 in...

Conversion of tropical peat swamp forests to increase and agricultural production has generated substantial peat carbon loss in the Asia-Pacific region. Different land-uses and management practices oxidize the tropical peat at diverse rates due mainly to different water table levels. In recent years, several studies have measured soil carbon dioxid...

Shallow soils occur throughout the world and are recognized as Leptosols at the highest level in the World Reference Base (WRB). These soils are notionally characterized as having a lithic contact close to the soil surface. Within the Canadian System of Soil Classification (CSSC), shallow soils are currently handled at the family level according to...

Reduced within‐field potato yield variation may lead to increased productivity and reduced environmental impact. Using soil samples collected from 88 site‐years in commercial fields in New Brunswick, Canada from 2013–2017, this study examined how within‐field variation in potato tuber yield was related to soil properties and topographic features. A...

Non-marketable crops are increasingly being used as a tool to promote agroecosystem services and sustainable agriculture. Nevertheless, crops vary greatly in the traits by which they capture resources and influence the local ecosystem. Here we report on the traits and associated soil microbial communities that relate to aboveground biomass producti...

Under intensive low residue agricultural systems, such as those involving potato (Solanum tuberosum L.)-based systems, stagnant crop yields and declining soil health and environmental quality are common issues. This study evaluated the effects of pen-pack cow (Bos Taurus) manure application (20 Mg·ha−1) and cover crops on nitrate dynamics and soil...

Stagnating potato tuber yields in Prince Edward Island (PEI) are a major economic concern. Identification of factors influencing within-field yield variation may provide insight into strategies for overcoming yield limitations. A survey approach was used where soil samples were collected from 49 commercial fields from 2014 to 2017 from a total of 2...

Tropical peatlands are vital ecosystems that play an important role in global carbon storage and cycles. Current estimates of greenhouse gases from these peatlands are uncertain as emissions vary with environmental conditions. This study provides the first comprehensive analysis of managed and natural tropical peatland GHG fluxes: heterotrophic (i....

Ex-situ measurement of soil respiration is usually done with highly disturbed samples that may confound the interpretation and extrapolation of results. We have developed a lab respiration assessment method that better simulates field conditions and allows efflux estimations based on soil surface area. First, intact soil cores are extracted in the...

1）利用根系质量和根系产生的 CO 2 之间的回归关系进行测算；（ 2）减小 干扰的土壤微宇宙实验室培养； （3）手动去除土壤根系的根部隔离袋子； （4）完 整土块的根部隔离袋子； （5）土壤 13 C-CO 2 自然丰度。同时也考察了异养呼吸和 土壤湿度以及温度之间的关系。 并且通过定性评估表格来评价五种区分方法的各 个参数。从 2017 年 4 月 3 日到 19 日，根据每周测量土壤呼吸得到的平均值是 6.1 0.3 Mg C ha-1 y-1. 在这段时期内，手动除根和完整土块的原位根部隔离袋测 定的异养呼吸对于土壤总呼吸的贡献分别是 497%和 793%。通过根系质量，微 宇宙培养和 13 C-CO 2 自然丰度估计的异养呼吸贡献率是 5441%， 8-17%和 61...

Without accurate data on soil heterotrophic respiration (Rh), assessments of soil carbon (C) sequestration rate and C balance are challenging to produce. Accordingly, it is essential to determine the contribution of the different sources of the total soil CO2 efflux (Rs) in different ecosystems, but to date, there are still many uncertainties and u...

Without accurate data on soil heterotrophic respiration (Rh), assessments of soil carbon (C) sequestration rate and C balance are challenging to produce. Accordingly, it is essential to determine the contribution of the different sources of the total soil CO2 efflux (Rs) in different ecosystems, but to date, there are still many uncertainties and u...

Carbon dioxide emissions following fertilizer application to oil palm on peat in Jambi, Sumatra

Abstract Recent flooding of agricultural land in the northern Prairie Pothole Region – coupled with intensification of agriculture – has resulted in renewed efforts to drain Prairie Potholes. Drainage is used to improve growing conditions and increase the amount of land that can be cultivated. The aim of this study was to determine if duration of a...

The first International Peat Congress (IPC) held in the tropics - in Kuching (Malaysia) - brought together over 1000 international peatland scientists and industrial partners from across the world (“International Peat Congress with over 1000 participants!,” 2016). The congress covered all aspects of peatland ecosystems and their management, with a...

The first International Peat Congress (IPC) held in the tropics - in Kuching (Malaysia) - brought together over 1000 international peatland scientists and industrial partners from across the world ("International Peat Congress with over 1000 participants!," 2016). The congress covered all aspects of peatland ecosystems and their management, with a...

Increasing oil palm (OP) plantation establishment on tropical peatlands over the last few decades has major implications for the global carbon (C) budget. This study quantified total and heterotrophic soil carbon dioxide (CO2) emissions in an industrial OP plantation (7 year old, 149 trees ha− 1) on peat located in the eastern coast of the Sumatra...

http://www.sciencedirect.com/science/article/pii/S0016706116300167 Comeau L-P. Hergoualc’h K. Hartill J. Smith J. Verchot L.V. 2016. How do the heterotrophic and the total soil respiration of an oil palm plantation on peat respond to nitrogen fertilizer application? Geoderma, volume 268, 41-51. doi:10.1016/j.geoderma.2016.01.016 过去几十年间，热带泥炭地油棕榈树...

Carbon dioxide emissions and soil properties from intact and disturbed tropical peatlands of Indonesia. Tropical peatlands store about 50 Gt carbon (C) and are being increasingly degraded and deforested. If land use (LU) change on intact peatlands continues at the current rate, all the undisturbed peat swamp forests will have vanished by 2030. Dist...

This study quantified the fate of new carbon (C) in four crop sequences (lentil–wheat, canola–wheat, pea–wheat, and continuous wheat). Lentil–wheat and continuous wheat were grown in intact soil cores from a Brown Chernozem (BCz) and canola–wheat, pea–wheat, and continuous wheat in cores from a Dark Brown Chernozem (DBCz). In the first growing cycl...

The peatland plain of the province of Jambi is among the world largest tropical peatland area and store a noteworthy amount of organic carbon. This study compared soil CO2 fluxes and the peat soil properties in an intact peat swamp forest, a transitional logged drained forest and an oil palm plantation located on the same alluvial peat plain. Field...

This work quantified the fate of soil C captured during a single growing season of four simple cropping sequences in the Canadian prairies and evaluated the fate of those original residues in the soil after a second growing season planted with wheat. The studied cropping sequences were: continuous wheat, pea-wheat and canola-wheat from Scott, Saska...

http://www.cifor.org/publications/pdf_files/WPapers/WP110Comeau.pdf Tropical peatlands are among the largest pedologic pools of organic carbon. This study compared soil CO2 fluxes in an intact peat swamp forest, a transitional logged drained forest and an oil palm plantation located on the same alluvial peat plain (peat dome) in Jambi, Sumatra, In...

Pulse crops represent an ever-increasing proportion of cropping systems in the Northern Great Plains. Previous studies have noted apparent benefits associated with pulse crop production that extend beyond the reduced need for N fertilizer in the year of production; these benefits have been attributed to the quality of pulse residues and their effec...

Even though the sustainability of crop rotation with pulses has been demonstrated by ancient civilizations, the effects of legume crops on soil organic carbon (SOC) and soil organic nitrogen (SON) dynamics has not yet been adequately quantified in the Canadian Prairies. The main goal of this thesis was to analyze the impacts of incorporating lentil...

Restoring C into the soil is fundamental to improve soil quality, to increase agronomic productivity, to mitigate greenhouse gas emissions and to enhance several ecosystem services. The objective of this study was to determine the quantity and the fate of C captured during a single growing season of four typical crop rotations in the Prairies (cont...

Both the quantity and quality of crop residues can impact soil properties and processes. Plants enriched with isotopic tracers can be used to trace crop residue decomposition to various C pools, but only if the tracer is homogeneously distributed throughout the plant. In order to determine if repeat-pulse labeling could be used to trace crop residu...

Pulse crops in rotation are known to improve the sustainability of cropping systems through biological N fixation; however, studies indicate there may be additional benefits, particularly with respect to the influence of pulse crops on the overall N cycle in both the pulse and non-pulse years. To quantify these additional benefits, soil processes a...

The advent of the “bioeconomy” coupled with a burgeoning human population has placed an increased demand on our soil resources. Concurrently, the build-up of atmospheric greenhouse gases has been described as the greatest environmental challenge ever faced by humanity. Pulse crops could play an important role in the bioeconomy, and research to date...

Overall, including pulse crops in the rotation had a significant positive effect on gross nitrification, but only a minor (negative) effect on gross mineralization. For mineralization, this appears to be a function of quality vs. quantity; for nitrification, this may reflect microbial differences, or an underestimate of nitrification rates in the n...

Both the quantity and quality of crop residues can impact soil properties and processes. Plants enriched with isotopic tracers can be used to trace crop residue decomposition to various carbon (C) pools but only if the tracer is homogeneously distributed throughout the plant. In order to determine if repeat-pulse labeling could be used to trace cro...

Soil carbon (C) sequestration mitigates climate change and improves lands productivity. Root derived soil C during a growing season is the first step toward C sequestration. The goal of this work was to evaluate the quantity and fate of newly produced soil organic carbon (SOC) captured at the end of a single growing season of canola, lentil, pea an...

Pulse Crop Effect on Soil Organic Nitrogen Mineralization in two Saskatchewan Ecoregions The lack of understanding the factors that control soil organic nitrogen decomposition into plant accessible forms (mineralization) cause us to be unable to make accurate assessment of how much ammonium (NH4) and nitride (NO3) will be released from the soil to...

Quantity and Fate of Carbon Rhizodeposition in Lentil, Pea, Canola and Wheat Rotations The transformation of CO2 into soil organic matter mitigates global warming and improves crop yields. Carbon (C) rhizodeposition is the initial step toward C sequestration. The objective of this study was to compare the quantity and fate of newly formed soil orga...

Introduction Mountainous tropical soils represent an important portion of the total terrestrial area. In Mexico about 60 percent of the territory is covered by mountain; yet, only recently researchers have focused their studies on the edafodiversity of Mexican mountains. The goal of this study was to describe soil properties in a representative are...

Canada is known as a territory were the pedodiversity is low. Nevertheless, this label is possibly due, in part, to the structure of the Canadian System of Soil Classification which is concise and straightforward. The main aim of this work was to classify the soils of six sites with the Canadian System of Soil Classification (CSSC) and with the Wor...

ANATOMY OF 3 STAGES OF THE EMBRYONIC DEVELOPMENT OF Coffea arabica var. tipica (Rubiaceae) COMEAU Louis-Pierre* PONCE SALAZAR Margarita* * Facultad de Ciencias, Universidad Nacional Autónoma de México, México D.F. Due to its anatomical, morphologic and phenologic characteristics, the study of the embryology of the coffee plant is difficult. There...

A nivel general, se encontraron menos efectos producidos por las variables independientes (manejo, variedad, ambiente y suelo) sobre la calidad organoléptica, que sobre la productividad. De lo anterior se induce que variaciones muy pequeñas en el procesamiento postcosecha pueden provocar cambios muy trascendentales en las cualidades organolépticas...

Effect of Soil Properties on the Quality and Productivity of Coffee in Mountainous Regions of Sierra Madre del Sur (Southern México). Louis-Pierre Comeau, Lab. Edafología, Facultad de Ciencias, UNAM., Av. Universidad, 3000, Mexico city, 04510, Mexico and Pavel Krasilnikov, (1) Institute of Biology, KarRC, RAS (2) Facultad de Ciencias, UNAM, (1) Pu...