Johannes Wilhelmus Maria Pullens

ORCID: 0000-0003-4581-6444
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About
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Research Areas
  • Peatlands and Wetlands Ecology
  • Climate change impacts on agriculture
  • Crop Yield and Soil Fertility
  • Soil Carbon and Nitrogen Dynamics
  • Soil and Water Nutrient Dynamics
  • Botany and Plant Ecology Studies
  • Greenhouse Technology and Climate Control
  • Plant nutrient uptake and metabolism
  • Wheat and Barley Genetics and Pathology
  • Plant Water Relations and Carbon Dynamics
  • Climate change and permafrost
  • Agricultural Economics and Policy
  • Hydrology and Watershed Management Studies
  • Coastal wetland ecosystem dynamics
  • Plant responses to elevated CO2
  • Atmospheric and Environmental Gas Dynamics
  • Cryospheric studies and observations
  • Soil Moisture and Remote Sensing
  • Fire effects on ecosystems
  • Remote Sensing in Agriculture
  • Rice Cultivation and Yield Improvement
  • Potato Plant Research
  • Bioenergy crop production and management
  • Agriculture Sustainability and Environmental Impact
  • Plant Parasitism and Resistance

Aarhus University
2019-2025

Fondazione Edmund Mach
2016-2019

University College Cork
2016-2019

Kiel University
2019

Wageningen University & Research
2016

Abstract Wheat is the most widely grown food crop, with 761 Mt produced globally in 2020. To meet expected grain demand by mid-century, wheat breeding strategies must continue to improve upon yield-advancing physiological traits, regardless of climate change impacts. Here, best performing doubled haploid (DH) crosses an increased canopy photosynthesis from field experiments literature were extrapolated global scale a multi-model ensemble process-based crop models estimate production. The DH...

10.1088/1748-9326/aca77c article EN cc-by Environmental Research Letters 2022-11-30

Abstract. Over the past decades, vegetation and climate have changed significantly in Arctic. Deciduous shrub cover is often assumed to expand tundra landscapes, but more frequent abrupt permafrost thaw resulting formation of ponds could lead shifts towards graminoid-dominated wetland. Which factors drive changes ecosystem are still not sufficiently clear. In this study, dynamic model, NUCOM-tundra (NUtrient COMpetition), was used evaluate consequences change scenarios warming increasing...

10.5194/bg-13-6229-2016 article EN cc-by Biogeosciences 2016-11-18

The atmospheric increase in N2O is mainly derived from N fertilisation agriculture, and improved emission estimates are needed for effective mitigation. This study presents first of country-specific emissions synthetic liquid organic fertilisers Denmark. Representative crop rotations were established four locations across Denmark to provide a realistic context the estimation emissions, i.e., dairy farm rotation Western Denmark, pig Southwestern an arable Eastern sites light-textured typical...

10.1016/j.agee.2023.108718 article EN cc-by Agriculture Ecosystems & Environment 2023-08-28

Wetlands are the largest and most uncertain biological source of atmospheric methane, with hydrological fluctuations exacerbating this uncertainty. Here we critically explore complex relationship between methane emissions in wetlands by integrating observations from 31 FLUXNET wetland sites a comprehensive literature review. We present prevalence patterns water table their contribution to uncertainty fluxes. also highlight key pathways through which these affect production emission, such as...

10.1038/s43247-024-01635-w article EN cc-by-nc-nd Communications Earth & Environment 2024-08-29

The role of plant phenology as a regulator for gross ecosystem productivity (GEP) in peatlands is empirically not well constrained. This because proxies to track vegetation development with daily coverage at the scale have only recently become available and lack such data has hampered disentangling biotic abiotic effects. study aimed unraveling mechanisms that regulate seasonal variation GEP across network eight European peatlands. Therefore, we described canopy greenness derived from...

10.1111/gcb.14905 article EN Global Change Biology 2019-11-05

Abstract Crop multi-model ensembles (MME) have proven to be effective in increasing the accuracy of simulations modelling experiments. However, ability MME capture crop responses changes sowing dates and densities has not yet been investigated. These management interventions are some main levers for adapting cropping systems climate change. Here, we explore performance a 29 wheat models predict effect changing rates on yield components, two sites located high-yielding environment New...

10.1093/jxb/erac221 article EN cc-by Journal of Experimental Botany 2022-06-21

NLES5 is the fifth version of an empirical model for predicting annual nitrate leaching from root zone (1-meter depth), accounting effects nitrogen (N) inputs, crop sequences, autumn and winter cover, soil types, weather conditions. It was developed calibrated based on a comprehensive dataset, primarily Denmark. The used quantifying under Danish soil, weather, field management practice. simulates N application rate, presence cover crop, targeting measures to reduce agricultural improvement...

10.1016/j.eja.2022.126465 article EN cc-by European Journal of Agronomy 2022-02-01

Abstract Fluxes of the powerful greenhouse gas nitrous oxide (N 2 O) are mainly quantified using manually operated or automatic non‐steady‐state chambers. With both systems, fluxes calculated as change in N O concentration over time linear non‐linear regression, but type regression selected can have a strong influence on flux magnitude. The HMR package, regression‐based implementation Hutchinson & Mosier Regression, is widely used software for trace calculation that provides...

10.1111/ejss.13340 article EN cc-by-nc-nd European Journal of Soil Science 2023-01-01

Peatland rewetting can reduce CO2 emissions but unintendedly increase CH4 from drained peatlands. The magnitude of these depends on factors such as time since rewetting, nutrient availability, vegetation type and water table fluctuations. In this study, we used automatic chambers to measure in a rewetted fen peatland under (a) grass-dominated (b) Juncus sp. dominated plots. Our objectives were (1) quantify emissions, (2) identify how affected by type, (3) relate changes table.The study was...

10.5194/egusphere-egu25-15885 preprint EN 2025-03-15

Drained agricultural peatlands are a large source of greenhouse gasses (GHGs) due to peat oxidation. Paludiculture, where flood-tolerant grasses grown on rewetted peatlands, might be potential strategy for climate change mitigation by reducing GHG emissions while maintaining biomass production. This study assessed the impact different harvest and fertilization treatments reed canary grass (Phalaris arundinacea, cv. Lipaula; RCG) exchange dynamics global warming (GWP) in two measurement...

10.5194/egusphere-egu25-11328 preprint EN 2025-03-14

With climate change, both drought and heavy precipitation are becoming more frequent. The EJPSOIL project SoilX investigated the possibilities to mitigate impacts of such extremes on crop productivity through improved soil management practices. To do that, we applied a multidisciplinaryresearch framework. Three methodological approaches were derive complementary findings alleviate increasingly frequent cropping systems in Europe adaptations management: (1) sampling measurement campaigns...

10.5194/egusphere-egu25-16532 preprint EN 2025-03-15

ABSTRACT Pedotransfer functions (PTFs) are widely used empirical relationships to estimate soil hydraulic parameters. PTFs usually derived from point samples analysed in the field or laboratory; thus, they contain uncertainties at different levels (i.e., sampling and measuring techniques, as well approaches chosen quantify relationships). When parametrize agro‐hydrological models, both choice of PTF model may influence simulation results. Both sources variance (PTF structural differences)...

10.1111/ejss.70088 article EN cc-by European Journal of Soil Science 2025-03-01

Abstract. We here present a detailed dataset of automated greenhouse gas (GHG) net soil and ditch fluxes carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) from drained fen in Denmark covering full year. The resolves small scale spatial hourly-daily-seasonal dynamics GHG fluxes. flux is accompanied by simultaneous time series temperature moisture, as well groundwater table depth covers spatiotemporal gradients hydrological climatic variability. CO2, CH4 N2O were measured simultaneously...

10.5194/essd-2025-123 preprint EN cc-by 2025-03-25
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