Mark Durenkamp

Mark Durenkamp
Rothamsted Research · Sustainable Agriculture Sciences – Harpenden

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25
Publications
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Publications

Publications (25)
Article
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Bioenergy crops have a secondary benefit if they increase soil organic C (SOC) stocks through capture and allocation below-ground. The effects of four genotypes of short-rotation coppice willow (Salix spp., ‘Terra Nova’ and ‘Tora’) and Miscanthus (M. × giganteus (‘Giganteus’) and M. sinensis (‘Sinensis’)) on roots, SOC and total nitrogen (TN) were...
Article
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Biochar amendment of agricultural soils can have a significant impact on microbial carbon (C) metabolism by providing C substrates and altering soil properties, including amelioration of soil acidity. It remains unclear whether available C of biochar or its pH effects determines the utilization of biochar by microorganisms. Compound-specific stable...
Article
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PurposePositive priming effect following the incorporation of biochar may partially reduce the biochar-induced soil carbon (C) sequestration. We hypothesize that repeated biochar incorporations induce further priming effect in the soil that was already amended with biochar. Materials and methodsTwo biochars prepared from Miscanthus giganteus at 350...
Article
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Biochar has been widely proposed to be valuable in the sequestering of carbon (C) in soil due to its chemical and biological recalcitrance. However, whether biochar could cause soil positive priming effects (PEs), which offset the effects of soil organic C sequestration, has raised a very controversial issue and debate recently. Changed soil proper...
Article
Full-text available
One of the main pathways by which engineered nanoparticles (ENPs) enter the environment is through land application of waste water treatment plant (WWTP) sewage sludges. WWTP sludges, enriched with Ag and ZnO ENPs or their corresponding soluble metal salts during anaerobic digestion and subsequently mixed with soil (targeting a final concentration...
Article
We examined the effects of amending soil with biosolids produced from a pilot-scale wastewater treatment plant containing a mixture of metal-based engineered nanomaterials (ENMs) on the growth of Medicago truncatula, its symbiosis with Sinorhizobium meliloti, and on soil microbial community structure. Treatments consisted of soils amended with bios...
Article
Chemical transformations of silver nanoparticles (Ag NPs) and zinc oxide nanoparticles (ZnO NPs) during wastewater treatment and sludge treatment must be characterized to accurately assess the risks that these nanomaterials pose from land application of biosolids. Here, X-ray absorption spectroscopy (XAS) and supporting characterization methods are...
Article
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Biochar has been widely proposed as a soil amendment, with reports of benefits to soil physical, chemical and biological properties. To quantify the changes in soil microbial biomass and to understand the mechanisms involved, two biochars were prepared at 350 °C (BC350) and 700 °C (BC700) from Miscanthus giganteus, a C4 plant, naturally enriched wi...
Article
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The efficiency of the fumigation extraction method on the determination of soil microbial biomass carbon and ninhydrin-N was tested in three different soils (UK grassland, UK arable, Chinese arable) amended with black carbon (biochar or activated charcoal). Addition of activated charcoal to soil resulted in a significant decrease in K2SO4 extractab...
Article
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The reduction of adenosine 5′-phosphosulphate (APS) by APS reductase (APR) is considered to be one of the rate-limiting steps in the assimilation of sulphur in plants. In order to identify the mechanisms of regulation of this enzyme, the impact of atmospheric H2S exposure on mRNA expression, protein level, and activity of APR was studied in two spe...
Article
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Onion (Allium cepa L.) was exposed to low levels of H2S in order to investigate to what extent H2S could be used as a sulfur source for growth under sulfate-deprived conditions. Sulfate deprivation for a two-week period resulted in a decreased biomass production of the shoot, a subsequently decreased shoot to root ratio and an increased dry matter...
Chapter
The impact of atmospheric sulfur gases was studied in onion (Allium cepa L.). The occurrence of toxic effects of H2S in onion depended not only on the atmospheric H2S level but also on the duration of the exposure. Prolonged exposure of onion to ≥ 0.3 µl l−1 H2S resulted in a strong reduction in shoot biomass production. H2S exposure resulted in a...
Article
Full-text available
Onion (Allium cepa L.) was able to use atmospheric H2S as sole sulphur source for growth. The foliarly absorbed H2S was rapidly metabolized into water-soluble, non-protein thiol compounds, including cysteine, and subsequently into other sulphur compounds in the shoots. In H2S-exposed plants, the accumulation of sulphur compounds in the shoots was n...
Article
Full-text available
The impact of atmospheric H2S deposition on growth and sulfur metabolism has been studied in onion (Allium cepa L.). The H2S uptake followed saturation kinetics with respect to the H2S concentration. The maximum H2S uptake rate (JH2Smax) was approx. 1 μmol g-1 FW h-1 and the KH2S (H2S concentration at which 1/2JH2Smax was reached) was approx. 1.5 μ...

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