Nitrogen availability mediates the priming effect of soil organic matter by preferentially altering the straw carbon-assimilating microbial community

2022 ◽  
pp. 152882
Author(s):  
Shuikuan Bei ◽  
Xia Li ◽  
Thomas Kuyper ◽  
Dave Chadwick ◽  
Junling Zhang
Keyword(s):  
Organic Matter ◽  
Microbial Community ◽  
Soil Organic Matter ◽  
Priming Effect ◽  
Nitrogen Availability

scholarly journals Regulation of priming effect by soil organic matter stability over a broad geographic scale

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Leiyi Chen ◽  
Li Liu ◽  
Shuqi Qin ◽  
Guibiao Yang ◽  
Kai Fang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Priming Effect ◽  
Basal Respiration ◽  
Soil Conditions ◽  
The Tibetan Plateau ◽  
Geographic Scale ◽  
Soil C ◽  
Chemical Structures ◽  
C Dynamics

Abstract The modification of soil organic matter (SOM) decomposition by plant carbon (C) input (priming effect) represents a critical biogeochemical process that controls soil C dynamics. However, the patterns and drivers of the priming effect remain hidden, especially over broad geographic scales under various climate and soil conditions. By combining systematic field and laboratory analyses based on multiple analytical and statistical approaches, we explore the determinants of priming intensity along a 2200 km grassland transect on the Tibetan Plateau. Our results show that SOM stability characterized by chemical recalcitrance and physico-chemical protection explains more variance in the priming effect than plant, soil and microbial properties. High priming intensity (up to 137% of basal respiration) is associated with complex SOM chemical structures and low mineral-organic associations. The dependence of priming effect on SOM stabilization mechanisms should be considered in Earth System Models to accurately predict soil C dynamics under changing environments.

Cover crops and tillage influence soil organic matter and nitrogen availability in a semi-arid vineyard

2012 ◽  
Vol 58 (sup1) ◽  
pp. SS95-SS102 ◽  
Author(s):  
Fernando Peregrina ◽  
Eva Pilar Pérez-Álvarez ◽  
Mikel Colina ◽  
Enrique García-Escudero
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Cover Crops ◽  
Nitrogen Availability ◽  
Semi Arid

scholarly journals An Approach to Incorporate Rhizosphere Priming Effect into Soil Organic Matter Models

2021 ◽  
Author(s):  
Oleg Chertov ◽  
Yakov Kuzyakov ◽  
Irina Priputina ◽  
Pavel Frolov ◽  
Vladimir Shanin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Priming Effect ◽  
C:N Ratio ◽  
Target Function ◽  
Terrestrial Ecosystems ◽  
Model Verification ◽  
Mineral N ◽  
Soil System ◽  
Plant Soil

Abstract Purpose. This study is aimed to develop a model of priming effect (accelerated mineralisation of soil organic matter (SOM)) induced by root exudate input into nitrogen (N) limited rhizosphere soil as a typical case for most terrestrial ecosystems. This ecologically important process in the functioning of the “plant-soil” system was parameterized for temperate and boreal forests.Methods. A model of priming effect has been developed based on the concept of N mining to making up for the N scarcity in exudates by accelerating SOM mineralisation. Lacking N for microbial growth is mined from the SOM mineralisation considering C:N ratio of soil. The model has a built-in food web module, which calculates soil fauna feeding on microorganisms, the release of by-products of faunal metabolism and mineral N used for root uptake.Results. The model verification demonstrated the similar order of the priming effect as in the published experiments. Testing at the pedon level revealed a high sensitivity of the model to N content in root exudates. Testing of the model at the ecosystem level revealed that CO2 emission from the priming can reach 25–30% of CO2 emission from the whole Ah horizon of forest soil. The same intensities were simulated for the fauna-derived N released within the rhizosphere.Conclusion. The new model reflects important ecological consequences of the main target function of priming effects within the “plant – soil – microorganisms – fauna” system – the microbial acceleration of C and N cycling in the rhizosphere and detritusphere to mobilise mineral N for plants.

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