Legacies of organic matter removal: decreased microbial biomass nitrogen and net N mineralization in New Zealand Pinus radiata plantations

Smaill, Simeon J.; Clinton, Peter W.; Greenfield, L. G.

doi:10.1007/s00374-009-0427-2

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…As a major N sink during N immobilization and a source during N mineralization, the increase in soil MBN content is helpful to reduce the immobilization of N, thus increasing soil N mineralization (Bardgett et al 2007;Singh et al 1989;Wardle et al 2004). That is probably why a significant and positive relationship exists between soil N net mineralization rate and soil MBN content in the P. amarus plantation, which was also consistent with many other related studies (Dong et al 2012;Smaill et al 2010).…”

Section: Discussionsupporting

confidence: 90%

Soil-nitrogen net mineralization increased after nearly six years of continuous nitrogen additions in a subtropical bamboo ecosystem

Xiao

Chen

et al. 2015

J. For. Res.

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In order to understand the effects of increasing atmospheric nitrogen (N) deposition on the subtropical bamboo ecosystem, a nearly six-year field experiment was conducted in a Pleioblastus amarus plantation in the rainy region of SW China, near the western edge of Sichuan Basin. Four N treatment levels-control (no N added), low-N (50 kg N ha -1 a -1 ), medium-N (150 kg N ha -1 a -1 ), and high-N (300 kg N ha -1 a -1 )-were applied monthly in the P. amarus plantation starting in November 2007. In June 2012, we collected intact soil cores in the bamboo plantation and conducted a 30-day laboratory incubation experiment. The results showed that the soil N net mineralization rate was 0.96 ± 0.10 mg N kg -1 day -1 , under control treatment. N additions stimulated the soil N net mineralization, and the high-N treatment significantly increased the soil N net mineralization rate compared with the control. Moreover, the soil N net mineralization rate was significantly and positively correlated with the fine root biomass, the soil microbial biomass nitrogen content and the soil initial inorganic N content, respectively, whereas it was negatively correlated with the soil pH value. There were no significant relationships between the soil N net mineralization rate and the soil total nitrogen (TN) content and the soil total organic carbon content and the soil C/N ratio and the soil microbial biomass carbon content, respectively. These results suggest that N additions would improve the mineral N availability in the topsoil of the P. amarus plantation through the effects of N additions on soil chemical and physical characteristics and fine-root biomass.

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Section: Discussionsupporting

confidence: 90%

Soil-nitrogen net mineralization increased after nearly six years of continuous nitrogen additions in a subtropical bamboo ecosystem

Xiao

Chen

et al. 2015

J. For. Res.

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“…Irrigated soils in arid climates typically have lower organic carbon contents [29] and low precipitation de-incentivizes organic matter additions to improve water retention and infiltration. Reduction in available substrates [30] combined with intensive management could diminish populations of disturbance-sensitive microbes in bulk and rhizosphere soils [31] and their contribution to crop nutrition and productivity.…”

Section: The Unique Irrigated Environmentmentioning

confidence: 99%

Toward an Integrated Root Ideotype for Irrigated Systems

Schmidt

Gaudin

2017

Trends in Plant Science

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Breeding towards root-centric ideotypes can be a relatively quick trait-based strategy to improve crop resource use efficiency. Irrigated agriculture represents a crucial and expanding sector, but its unique parameters require traits distinct from previously proposed rainfed ideotypes. We propose a novel irrigated ideotype that integrates traits across multiple scales to enhance resource use efficiency in irrigated agroecosystems, where resources are concentrated in a relatively shallow 'critical zone'. Unique components of this ideotype include rapid transplant recovery and establishment, enhanced exploitation of localized resource hotspots, adaptive physiological regulation, maintenance of hydraulic conductivity, beneficial rhizosphere interactions, and salinity/waterlogging avoidance. If augmented by future research, this target could help to enhance agricultural sustainability in irrigated agroecosystems by guiding the creation of resource-efficient cultivars.

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“…Johnson, 1994;Ballard, 2000;Smaill et al, 2008), or soil microbial community biomass and activity (Smaill et al, 2010;Achat et al, 2015). Integration of this additional data would likely also see more variations arise between the different growth trajectories based on other regional differences.…”

Section: Regionmentioning

confidence: 99%

Multi-rotation impacts of increased organic matter removal in planted forests

Smaill

Garrett

2016

J. Soil Sci. Plant Nutr.

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Organic matter cycling is critical to nutrient supply in forested ecosystems. Harvesting influences future nutrient supply by removing organic matter, but the extent of removal varies with harvesting methods. In New Zealand plantations there is little long-term data to help evaluate the relative impact of these methods on the sustainability of site productivity. To explore this issue a modelling study was initiated using the NuBalM platform to simulate the response of forest nitrogen (N) pools and the productivity of Pinus radiata D. Don to the consisten removal of different amounts of organic matter at harvest over multiple 30 year rotations across a range of growth trajectories. The harvesting method involving the greatest amount of organic matter removal (OMR) induced significant reductions in N pools and productivity by the end of the second rotation, while moderate OMR induced reductions by the end of the third rotation. Minimal OMR reduced N pools but not productivity by the end of the fourth rotation. This exploratory work suggests that management practices which influence the amount of organic matter on site can play an important role in long-term productivity and should be considered in further risk based management decision making.

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Legacies of organic matter removal: decreased microbial biomass nitrogen and net N mineralization in New Zealand Pinus radiata plantations

Cited by 11 publications

References 26 publications

Soil-nitrogen net mineralization increased after nearly six years of continuous nitrogen additions in a subtropical bamboo ecosystem

Soil-nitrogen net mineralization increased after nearly six years of continuous nitrogen additions in a subtropical bamboo ecosystem

Toward an Integrated Root Ideotype for Irrigated Systems

Multi-rotation impacts of increased organic matter removal in planted forests

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