Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime

The majority of soil organic nitrogen (N) is bound in protein-like compounds and therefore its proteolysis in peptides and amino acids is considered the initial and rate limiting step of N mineralization. Proteolysis of N bound in organic fertilizer and subsequent provisioning for crops is a central...

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Main Authors: Martina Lori, Sarah Symanczik, Paul Mäder, Norah Efosa, Sebastian Jaenicke, Franz Buegger, Simon Tresch, Alexander Goesmann, Andreas Gattinger
Format: Article
Language:English
Published: Frontiers Media S.A. 2018-06-01
Series:Frontiers in Environmental Science
Subjects:
Online Access:https://www.frontiersin.org/article/10.3389/fenvs.2018.00040/full
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spelling doaj-9ee9a11a604e4461a6b1e3da708754fe2020-11-24T23:54:11ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2018-06-01610.3389/fenvs.2018.00040378477Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water RegimeMartina Lori0Martina Lori1Sarah Symanczik2Paul Mäder3Norah Efosa4Sebastian Jaenicke5Franz Buegger6Simon Tresch7Simon Tresch8Simon Tresch9Alexander Goesmann10Andreas Gattinger11Andreas Gattinger12Department of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandOrganic Farming With Focus on Sustainable Soil Use, Justus-Liebig University Giessen, Giessen, GermanyDepartment of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandDepartment of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandDepartment of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandBioinformatics and Systems Biology, Justus-Liebig University Giessen, Giessen, GermanyGerman Research Center for Environmental Health, Institute of Biochemical Plant Pathology, Helmholtz Zentrum München GmbH, Neuherberg, GermanyDepartment of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandFunctional Ecology Laboratory, Institute of Biology, University of Neuchâtel, Neuchâtel, SwitzerlandBiodiversity and Conservation Biology, Swiss Federal Research Institute WSL, Birmensdorf, SwitzerlandBioinformatics and Systems Biology, Justus-Liebig University Giessen, Giessen, GermanyDepartment of Soil Sciences, Research Institute of Organic Agriculture FiBL, Frick, SwitzerlandOrganic Farming With Focus on Sustainable Soil Use, Justus-Liebig University Giessen, Giessen, GermanyThe majority of soil organic nitrogen (N) is bound in protein-like compounds and therefore its proteolysis in peptides and amino acids is considered the initial and rate limiting step of N mineralization. Proteolysis of N bound in organic fertilizer and subsequent provisioning for crops is a central element in agro-ecological intensification. Long-term farming system effects on N provisioning from organic fertilizer to crops and its underlying functional microbial communities were analyzed in experiments conducted in soils from the “DOK” system comparison trial (bio-Dynamic, bio-Organic, and “Konventionell”) subjected to optimal and future projected drought scenarios. A plant nutrition experiment using 15N labeled lupine as a fertilizer (green manure) identified 30% higher amounts of N derived from fertilizer in ryegrass grown on organically compared to conventionally managed soil, but only when subjected to dry conditions. A second experiment, also amended with lupine green manure, assessed the effect of farming system and drought stress on N cycling microbes with a focus on alkaline (apr) and neutral (npr) metallopeptidase encoding microbial communities. apr encoding microbial communities were more strongly affected by farming system and water treatment than npr encoding communities. Differences in structure and diversity of apr encoding microbial communities showed concomitant patterns with distinct N provisioning from organic fertilizer in the plant nutrition experiment. It is suggested that conventionally managed systems are less capable in maintaining diversity and initial structure of apr encoding microbial communities when subjected to drought scenarios. Overall, we demonstrated organically managed soils to provide a more stable N provisioning potential from organic fertilizer under future drought scenarios, likely facilitated by a distinct and more adaptive proteolytic microbial community. This work contributes to an in-depth comprehension of yet poorly studied fundamental soil processes and helps developing strategies to maintain a versatile and functioning microbial community in a rapidly changing environment.https://www.frontiersin.org/article/10.3389/fenvs.2018.00040/fullorganic farmingclimate changedroughtnitrogen provisioningprotease encoding microbes
collection DOAJ
language English
format Article
sources DOAJ
author Martina Lori
Martina Lori
Sarah Symanczik
Paul Mäder
Norah Efosa
Sebastian Jaenicke
Franz Buegger
Simon Tresch
Simon Tresch
Simon Tresch
Alexander Goesmann
Andreas Gattinger
Andreas Gattinger
spellingShingle Martina Lori
Martina Lori
Sarah Symanczik
Paul Mäder
Norah Efosa
Sebastian Jaenicke
Franz Buegger
Simon Tresch
Simon Tresch
Simon Tresch
Alexander Goesmann
Andreas Gattinger
Andreas Gattinger
Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
Frontiers in Environmental Science
organic farming
climate change
drought
nitrogen provisioning
protease encoding microbes
author_facet Martina Lori
Martina Lori
Sarah Symanczik
Paul Mäder
Norah Efosa
Sebastian Jaenicke
Franz Buegger
Simon Tresch
Simon Tresch
Simon Tresch
Alexander Goesmann
Andreas Gattinger
Andreas Gattinger
author_sort Martina Lori
title Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
title_short Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
title_full Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
title_fullStr Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
title_full_unstemmed Distinct Nitrogen Provisioning From Organic Amendments in Soil as Influenced by Farming System and Water Regime
title_sort distinct nitrogen provisioning from organic amendments in soil as influenced by farming system and water regime
publisher Frontiers Media S.A.
series Frontiers in Environmental Science
issn 2296-665X
publishDate 2018-06-01
description The majority of soil organic nitrogen (N) is bound in protein-like compounds and therefore its proteolysis in peptides and amino acids is considered the initial and rate limiting step of N mineralization. Proteolysis of N bound in organic fertilizer and subsequent provisioning for crops is a central element in agro-ecological intensification. Long-term farming system effects on N provisioning from organic fertilizer to crops and its underlying functional microbial communities were analyzed in experiments conducted in soils from the “DOK” system comparison trial (bio-Dynamic, bio-Organic, and “Konventionell”) subjected to optimal and future projected drought scenarios. A plant nutrition experiment using 15N labeled lupine as a fertilizer (green manure) identified 30% higher amounts of N derived from fertilizer in ryegrass grown on organically compared to conventionally managed soil, but only when subjected to dry conditions. A second experiment, also amended with lupine green manure, assessed the effect of farming system and drought stress on N cycling microbes with a focus on alkaline (apr) and neutral (npr) metallopeptidase encoding microbial communities. apr encoding microbial communities were more strongly affected by farming system and water treatment than npr encoding communities. Differences in structure and diversity of apr encoding microbial communities showed concomitant patterns with distinct N provisioning from organic fertilizer in the plant nutrition experiment. It is suggested that conventionally managed systems are less capable in maintaining diversity and initial structure of apr encoding microbial communities when subjected to drought scenarios. Overall, we demonstrated organically managed soils to provide a more stable N provisioning potential from organic fertilizer under future drought scenarios, likely facilitated by a distinct and more adaptive proteolytic microbial community. This work contributes to an in-depth comprehension of yet poorly studied fundamental soil processes and helps developing strategies to maintain a versatile and functioning microbial community in a rapidly changing environment.
topic organic farming
climate change
drought
nitrogen provisioning
protease encoding microbes
url https://www.frontiersin.org/article/10.3389/fenvs.2018.00040/full
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