Does accelerated soil organic matter decomposition in the presence of plants increase plant N availability?

Dijkstra, Feike A.; Bader, Nicholas E.; Johnson, Dale W.; Cheng, Weixin

doi:10.1016/j.soilbio.2009.02.013

Cited by 147 publications

(118 citation statements)

References 36 publications

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“…This increased rate of decomposition, also known as the priming effect, can also increase N mineralized from recalcitrant organic matter [26]. Increased N mineralization increases the amount of N available to plants [26,27]. This coupled cycling is particularly important in minimizing potential leaching losses of inorganic N, since unlike synthetic fertilizer application, this process leads to N being mineralized in response to plant demand and hence more likely to be assimilated by plants and less likely to be lost via leaching and other N loss pathways [12,26,28].…”

Section: Introductionmentioning

confidence: 99%

Agricultural Management and Labile Carbon Additions Affect Soil Microbial Community Structure and Interact with Carbon and Nitrogen Cycling

2013

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We investigated how conversion from conventional agriculture to organic management affected the structure and biogeochemical function of soil microbial communities. We hypothesized the following. (1) Changing agricultural management practices will alter soil microbial community structure driven by increasing microbial diversity in organic management. (2) Organically managed soil microbial communities will mineralize more N and will also mineralize more N in response to substrate addition than conventionally managed soil communities. (3) Microbial communities under organic management will be more efficient and respire less added C. Soils from organically and conventionally managed agroecosystems were incubated with and without glucose ( 13 C) additions at constant soil moisture. We extracted soil genomic DNA before and after incubation for TRFLP community fingerprinting of soil bacteria and fungi. We measured soil C and N pools before and after incubation, and we tracked total C respired and N mineralized at several points during the incubation. Twenty years of organic management altered soil bacterial and fungal community structure compared to continuous conventional management with the bacterial differences caused primarily by a large increase in diversity. Organically managed soils mineralized twice as much NO3 − as conventionally managed ones (44 vs. 23 μg N/g soil, respectively) and increased mineralization when labile C was added. There was no difference in respiration, but organically managed soils had larger pools of C suggesting greater efficiency in terms of respiration per unit soil C. These results indicate that the organic management induced a change in community composition resulting in a more diverse community with enhanced activity towards labile substrates and greater capacity to mineralize N.2

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Section: Introductionmentioning

confidence: 99%

Agricultural Management and Labile Carbon Additions Affect Soil Microbial Community Structure and Interact with Carbon and Nitrogen Cycling

2013

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“…In these cases, turnover rates of the microbial biomass increase but microbial activity associated with decomposition remains stable (Kuzyakov et al 2000). At other times increased microbial activity can lead to faster rates of SOM decomposition (''priming'') and subsequent release of plant available N (Bengtson et al 2012;Dijkstra et al 2009;Jingguo and Bakken 1997;Phillips et al 2010) as a result of increased predation on bacteria or competition for N by plants, for example (Clarholm 1985;Griffiths and Robinson 1992;Kuzyakov et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Physiological shifts in the microbial community drive changes in enzyme activity in a perennial agroecosystem

Hargreaves

Hofmockel

2013

Biogeochemistry

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Perennial agroecosystems have the potential to promote plant-microbial linkages by increasing the quantity of root carbon entering the soil. However, an understanding of how perennial cropping systems affect microbial communities remains incomplete. The objective of this study was to determine the potential for a fertilized perennial bioenergy cropping system to impact microbial growth and enzyme activity. Three times throughout the growing season we examined the activity of four enzymes involved in decomposition (ß-glucosidase, ß-xylosidase, cellobiohydrolase, and N-acetyl glucosaminidase) in replicated plots of an annual (corn) and perennial-based (switchgrass) cropping system. We also took simultaneous measurements of microbial biomass and potential rates of microbial respiration and net N mineralization. Microbial biomass was unaffected by cropping system. Mid-summer, however, we observed increases in enzyme activity and potential microbial respiration in the perennial system that were independent of microbial biomass, likely in response to labile carbon inputs. Further, we observed lower net N mineralization, higher microbial biomass nitrogen and higher activity of nitrogen liberating enzymes, which are indicative of a community with high nitrogen demands. Overall, our research demonstrates that perennial agroecosystems can affect the physiological capacity of the microbial community, yielding communities with greater nitrogen retention and greater rates of decomposition as a result of allocation of resources towards enzyme production and nitrogen mining. These results can inform biogeochemical models with respect to the importance of temporally dynamic changes in carbon and nitrogen availability and microbial carbon use efficiency as drivers of enzyme production.

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“…Understanding the interdependence of ecological processes that occur in forest plantations is essential in order to ensure the future provision of goods and services by both managed and planted forests [42,43] (Figure 1). In Mexico, knowledge should also be sought regarding the impact of various plant species and their response to environmental conditions [44]. Currently, very little is known in Mexico about the variability in primary productivity related to the composition of tree species and the effect of specific mixtures, which opens up an area of opportunity for the study of the primary productivity of planted forests.…”

Section: Mixed Forest Plantations In Mexico Beyond the Mitigation Ofmentioning

confidence: 99%

Tropical and Highland Temperate Forest Plantations in Mexico: Pathways for Climate Change Mitigation and Ecosystem Services Delivery

Cruz

Galicia

2017

Forests

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Forest plantations are a possible way of increasing forest productivity in temperate and tropical forests, and therefore also increasing above-and belowground carbon pools. In the context of climate change, monospecific plantations might become an alternative to mitigate global warming; however, their contribution to the structural complexity, complementarity, and biodiversity of forests has not been addressed. Mixed forest plantations can ensure that objectives of climate change mitigation are met through carbon sequestration, while also delivering anticipated ecosystem services (e.g., nutrient cycling, erosion control, and wildlife habitat). However, mixed forest plantations pose considerable operational challenges and research opportunities. For example, it is essential to know how many species or functional traits are necessary to deliver a set of benefits, or what mixture of species and densities are key to maintaining productive plantations and delivering multiple ecosystem services. At the same time, the establishment of forest plantations in Mexico should not be motivated solely by timber production. Forest plantations should also increase carbon sequestration, maintain biodiversity, and provide other ecosystem services. This article analyzes some matters that affect the development of planted forests in the Mexican national context, and presents alternatives for forest resources management through the recommendation of mixed forest plantations as a means of contributing to climate change mitigation and the delivery of ecosystem services.

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Does accelerated soil organic matter decomposition in the presence of plants increase plant N availability?

Cited by 147 publications

References 36 publications

Agricultural Management and Labile Carbon Additions Affect Soil Microbial Community Structure and Interact with Carbon and Nitrogen Cycling

Agricultural Management and Labile Carbon Additions Affect Soil Microbial Community Structure and Interact with Carbon and Nitrogen Cycling

Physiological shifts in the microbial community drive changes in enzyme activity in a perennial agroecosystem

Tropical and Highland Temperate Forest Plantations in Mexico: Pathways for Climate Change Mitigation and Ecosystem Services Delivery

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