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Rescooped by Ana Christina Duarte Pires from MycorWeb Plant-Microbe Interactions
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Impact of fire on active layer and permafrost microbial communities and metagenomes in an upland Alaskan boreal forest

Impact of fire on active layer and permafrost microbial communities and metagenomes in an upland Alaskan boreal forest | Soil | Scoop.it

Permafrost soils are large reservoirs of potentially labile carbon (C). Understanding the dynamics of C release from these soils requires us to account for the impact of wildfires, which are increasing in frequency as the climate changes. Boreal wildfires contribute to global emission of greenhouse gases (GHG—CO2, CH4 and N2O) and indirectly result in the thawing of near-surface permafrost. In this study, we aimed to define the impact of fire on soil microbial communities and metabolic potential for GHG fluxes in samples collected up to 1 m depth from an upland black spruce forest near Nome Creek, Alaska. We measured geochemistry, GHG fluxes, potential soil enzyme activities and microbial community structure via 16SrRNA gene and metagenome sequencing. We found that soil moisture, C content and the potential for respiration were reduced by fire, as were microbial community diversity and metabolic potential. There were shifts in dominance of several microbial community members, including a higher abundance of candidate phylum AD3 after fire. The metagenome data showed that fire had a pervasive impact on genes involved in carbohydrate metabolism, methanogenesis and the nitrogen cycle. Although fire resulted in an immediate release of CO2 from surface soils, our results suggest that the potential for emission of GHG was ultimately reduced at all soil depths over the longer term. Because of the size of the permafrost C reservoir, these results are crucial for understanding whether fire produces a positive or negative feedback loop contributing to the global C cycle.


Via Francis Martin
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Rescooped by Ana Christina Duarte Pires from Agroecologia
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Vídeos apresentam experiências de agroecologia no país

Vídeos apresentam experiências de agroecologia no país | Soil | Scoop.it
"A Articulação Nacional de Agroecologia (ANA) promove o projeto Curta Agroecologia com pequenos documentários que retratam experiências de agricultura saudável no país. A ideia é dar visibilidade na cidade às ...

Via Martin Meier
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Rescooped by Ana Christina Duarte Pires from Glossarissimo!
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(EN) - Glossary of Terms Used in Agroecology | agroecology.org

(EN) - Glossary of Terms Used in Agroecology | agroecology.org | Soil | Scoop.it

"Glossary of Terms Used in Agroecology (agroecology.org)"


Via Stefano KaliFire
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Stefano KaliFire's curator insight, August 7, 2014 4:07 PM

Seen on: inboxtranslation.com

delacroixPROmichel's curator insight, August 16, 2014 6:12 AM

Un peu d'anglais…

Rescooped by Ana Christina Duarte Pires from Glossarissimo!
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(EN) - Glossary of ecology | Wikipedia, the free encyclopedia

Glossary of ecology - Wikipedia, the free encyclopedia

This is a list of ecology topics. It relates to the science of ecology which is the study of the interactions between various species and their natural environment.

"This is a list of ecology topics. It relates to the science of ecology which is the study of the interactions between various species and their natural environment."


Via Stefano KaliFire
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Stefano KaliFire's curator insight, August 7, 2014 3:18 PM

Seen on: inboxtranslation.com

Rescooped by Ana Christina Duarte Pires from Mycorrhiza
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Frontiers in Plant Traffic and Transport: How membranes shape plant symbioses: signaling and transport in nodulation and arbuscular mycorrhiza (2012)

Frontiers in Plant Traffic and Transport: How membranes shape plant symbioses: signaling and transport in nodulation and arbuscular mycorrhiza (2012) | Soil | Scoop.it

As sessile organisms that cannot evade adverse environmental conditions, plants have evolved various adaptive strategies to cope with environmental stresses. One of the most successful adaptations is the formation of symbiotic associations with beneficial microbes. In these mutualistic interactions the partners exchange essential nutrients and improve their resistance to biotic and abiotic stresses. In arbuscular mycorrhiza (AM) and in root nodule symbiosis (RNS), AM fungi and rhizobia, respectively, penetrate roots and accommodate within the cells of the plant host. In these endosymbiotic associations, both partners keep their plasma membranes intact and use them to control the bidirectional exchange of signaling molecules and nutrients. Intracellular accommodation requires the exchange of symbiotic signals and the reprogramming of both interacting partners. This involves fundamental changes at the level of gene expression and of the cytoskeleton, as well as of organelles such as plastids, endoplasmic reticulum (ER), and the central vacuole. Symbiotic cells are highly compartmentalized and have a complex membrane system specialized for the diverse functions in molecular communication and nutrient exchange. Here, we discuss the roles of the different cellular membrane systems and their symbiosis-related proteins in AM and RNS, and we review recent progress in the analysis of membrane proteins involved in endosymbiosis.


Via Kamoun Lab @ TSL, Alejandro Rojas, Ana Cláudia Pedersen
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Rescooped by Ana Christina Duarte Pires from MycorWeb Plant-Microbe Interactions
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The Role of Trees in Agroecology and Sustainable Agriculture in the Tropics

The Role of Trees in Agroecology and Sustainable Agriculture in the Tropics | Soil | Scoop.it

Shifting agriculture in the tropics has been replaced by sedentary smallholder farming on a few hectares of degraded land. To address low yields and low income both, the soil fertility, the agroecosystem functions, and the source of income can be restored by diversification with nitrogen-fixing trees and the cultivation of indigenous tree species that produce nutritious and marketable products. Biodiversity conservation studies indicate that mature cash crop systems, such as cacao and coffee with shade trees, provide wildlife habitat that supports natural predators, which, in turn, reduce the numbers of herbivores and pathogens. This review offers suggestions on how to examine these agroecological processes in more detail for the most effective rehabilitation of degraded land. Evidence from agroforestry indicates that in this way, productive and environmentally friendly farming systems that provide food and nutritional security, as well as poverty alleviation, can be achieved in harmony with wildlife.


Via Francis Martin
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Rescooped by Ana Christina Duarte Pires from Soil Ecology
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SAPS: Animation - Transport in Xylem and Phloem - YouTube

This animation covers plant transport, demonstrating how water travels through the plant, and how sugars are distributed around the plant. ...


Via Mary Williams, Olivier ANDRE, Fabiane Vezzani
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Mary Williams's curator insight, January 30, 2014 12:43 PM

Read about this animation and other teaching resources in the SAPS newsletter https://www.youtube.com/watch?v=LQ03xIkLLQU

Rescooped by Ana Christina Duarte Pires from Soil, science and food
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Microbes found in extreme environment on South American volcanoes | ScienceBlog.com

Microbes found in extreme environment on South American volcanoes | ScienceBlog.com | Soil | Scoop.it
A team led by the University of Colorado Boulder looking for organisms that eke out a living in some of the most inhospitable soils on Earth has found a hardy...

Via Mathieu Javaux
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