Microbial carbon processing along a river discontinuum

2016 ◽  
Vol 35 (4) ◽  
pp. 1133-1147 ◽  
Author(s):  
L. Proia ◽  
D. von Schiller ◽  
C. Gutierrez ◽  
J. P. Casas-Ruiz ◽  
L. Gómez-Gener ◽  
...  
Keyword(s):  
Microbial Carbon ◽  
Carbon Processing

scholarly journals Microbial carbon processing in oligotrophic Lake Lucerne (Switzerland): results of in situ 13C-labelling studies

2017 ◽  
Vol 136 (2) ◽  
pp. 131-149 ◽  
Author(s):  
J. M. Lammers ◽  
C. J. Schubert ◽  
J. J. Middelburg ◽  
G. J. Reichart
Keyword(s):  
Oligotrophic Lake ◽  
Lake Lucerne ◽  
13C Labelling ◽  
Microbial Carbon ◽  
Carbon Processing

Predicting Anaerobic Microsites in Soils

2021 ◽  
Author(s):  
Stefan Gerber ◽  
E.N.Jack Brookshire
Keyword(s):  
Soil Moisture ◽  
Soil Column ◽  
Mean Field ◽  
Solute Diffusion ◽  
Co2 Efflux ◽  
Earth System ◽  
Co2 Response ◽  
Closed Form Solutions ◽  
Microbial Carbon ◽  
Carbon Processing

<p>Anaerobic microsites in soils are critical features in the Earth system as they are prime locations for generating powerful greenhouse gases. These processes occur in hot spots and hot moments and are therefore difficult to capture in mean-field approaches. Typically, they are captured as empirical functions of soil moisture.</p> <p>We present a mechanistic upscaling of microsites from single soil particles to the soil column, by considering existing formulations that link the processes of solute diffusion, pore sizes and particle size distributions, and water retention. The upscaling allows to predict probability density functions of volume and surface area of anaerobic microsites, which can then be integrated to the scale of a laboratory soil sample or a field site. Our goal was to make these predictions based on variables typically measured in soils and are routine diagnostic or prognostic variables in Earth system model. While the detailed expressions can only be solved numerically, we found closed-form solutions with little loss of accuracy.  Our result have the necessary hooks for direct implementation of anaerobic microbial carbon processing, methane production and nitrification-denitrification processes in Earth System models. A first application yields two soil moisture-CO2 efflux hypotheses that could potentially be tested and which set this upscaling apart from empirical formulations 1) the degree of temperature sensitivity and dependence of carbon concentration in anaerobicity and 2) different CO2 response to soil moisture if measured in laboratory jars vs. measured in the field.</p> <p> </p>

Inactive and inefficient: Warming and drought effect on microbial carbon processing in alpine grassland at depth

2021 ◽  
Author(s):  
Erxiong Zhu ◽  
Zhenjiao Cao ◽  
Juan Jia ◽  
Chengzhu Liu ◽  
Zhenhua Zhang ◽  
...  
Keyword(s):  
Alpine Grassland ◽  
Drought Effect ◽  
Microbial Carbon ◽  
Carbon Processing

scholarly journals Microbial carbon and nitrogen cycling responses to drought and temperature in differently managed mountain grasslands

2019 ◽  
Vol 135 ◽  
pp. 144-153 ◽  
Author(s):  
Lucia Fuchslueger ◽  
Birgit Wild ◽  
Maria Mooshammer ◽  
Mounir Takriti ◽  
Sandra Kienzl ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Mountain Grasslands ◽  
Microbial Carbon

Microbial carbon use efficiency, biomass residence time and temperature sensitivity across ecosystems and soil depths

2020 ◽  
pp. 108117
Author(s):  
Jinquan Li ◽  
Junmin Pei ◽  
Feike.A. Dijkstra ◽  
Ming Nie ◽  
Elise Pendall
Keyword(s):  
Residence Time ◽  
Temperature Sensitivity ◽  
Carbon Use Efficiency ◽  
Microbial Carbon ◽  
Use Efficiency ◽  
Microbial Carbon Use Efficiency

Lower microbial carbon use efficiency reduces cellulose-derived carbon retention in soils amended with compost versus mineral fertilizers

2021 ◽  
Vol 156 ◽  
pp. 108227
Author(s):  
Yuncai Miao ◽  
Yuhui Niu ◽  
Ruyi Luo ◽  
Ye Li ◽  
Huijie Zheng ◽  
...  
Keyword(s):  
Mineral Fertilizers ◽  
Carbon Use Efficiency ◽  
Microbial Carbon ◽  
Use Efficiency ◽  
Carbon Retention ◽  
Microbial Carbon Use Efficiency

scholarly journals Hillslopes in Headwaters of Qinghai-Tibetan Plateau as Hotspots for Subsurface Dissolved Organic Carbon Processing during Permafrost Thaw

2021 ◽  
Author(s):  
Yuqin Sun ◽  
Kale Clauson ◽  
Min Zhou ◽  
Ziyong Sun ◽  
Chunmiao Zheng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Permafrost Thaw ◽  
Carbon Processing

Hillslopes in Headwaters of Qinghai-Tibetan Plateau as Hotspots for Dissolved Organic Carbon Processing during Permafrost Thaw

2020 ◽  
Author(s):  
Yan Zheng ◽  
Yuqin Sun ◽  
Kale Clauson ◽  
Min Zhou ◽  
Ziyong Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Permafrost Thaw ◽  
Carbon Processing

scholarly journals In-stream uptake and retention of C, N and P in a supraglacial stream

2010 ◽  
Vol 51 (56) ◽  
pp. 80-86 ◽  
Author(s):  
Durelle Scott ◽  
Eran Hood ◽  
Michael Nassry
Keyword(s):  
Nutrient Retention ◽  
Flow Paths ◽  
Lower Velocity ◽  
Outlet Glacier ◽  
Glacier Terminus ◽  
Order Of Magnitude ◽  
Bedload Sediment ◽  
Nutrient Injection ◽  
Carbon Processing ◽  
Ice Water

AbstractSupraglacial streams form annually during the melt season, transporting dissolved solutes from the melting ice and snowpack to subglacial flow paths and the glacier terminus. Although nutrient and carbon processing has been documented in other supraglacial environments (cryoconite holes, snowpack), little work has examined the potential for in-stream nutrient retention in supraglacial streams. Here we carried out a solute nutrient injection experiment to quantify NH3+, PO43−and labile dissolved organic carbon (DOC) retention in a supraglacial stream. The experiment was performed on a 100 m stream reach on Mendenhall Glacier, an outlet glacier on the Juneau Icefield, southeastern Alaska, USA. The study stream contained two distinct reaches of equal length. The first reach had a lower velocity (0.04 ms−1) and contained abundant gravel sediment lining the ice–water interface, while the second reach was devoid of bedload sediment and had an order-of-magnitude higher velocity. At the end of the second reach, the stream emptied into a moulin, which is typical of supraglacial streams on this and other temperate glaciers. We found that N and P were transported largely conservatively, although NO3−increased along the reach, suggestive of nitrification. Labile DOC was retained slightly within the stream, although rates were low relative to the travel times observed within the supraglacial stream. Although our findings show that these streams have low processing rates, measurable in-stream nitrification and dissolved organic matter uptake within this biologically unfavorable environment suggests that supraglacial streams with longer residence times and abundant fine substrate have the potential to modify and retain nutrients during transport to the glacier terminus.

Input related microbial carbon dynamic of soil organic matter in particle size fractions

2012 ◽  
Vol 47 ◽  
pp. 209-219 ◽  
Author(s):  
Antje Gude ◽  
Ellen Kandeler ◽  
Gerd Gleixner
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Microbial Carbon
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