Organic matter stabilization and ecosystem functions: proceedings of the fourth conference on the mechanisms of organic matter stabilization and destabilization (SOM-2010, Presqu’île de Giens, France)

Dignac, Marie-France; Rumpel, Cornélia

doi:10.1007/s10533-012-9768-2

Cited by 7 publications

(4 citation statements)

References 54 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the ongoing global change, with higher temperatures and altered precipitation patterns, it is likely that shifts in SOM composition may result in overall changes in SOM quality and turnover ( Pisani et al, 2014 ). In particular, the accumulation of aliphatic root-derived compounds could be relevant because it gives SOM a hydrophobic protection ( Dignac and Rumpel, 2013 ). Lignin, a second important compound, is mainly only degraded by a specific group of microorganisms, white-rot fungi and actinobacteria, which are able to secrete ligninolytic enzymes ( Osono, 2007 ; Baldrian, 2008 ; Floudas et al, 2012 ).…”

Section: Tree Root Decomposability and The Role Of Roots For Organic mentioning

confidence: 99%

How tree roots respond to drought

et al. 2015

View full text Add to dashboard Cite

The ongoing climate change is characterized by increased temperatures and altered precipitation patterns. In addition, there has been an increase in both the frequency and intensity of extreme climatic events such as drought. Episodes of drought induce a series of interconnected effects, all of which have the potential to alter the carbon balance of forest ecosystems profoundly at different scales of plant organization and ecosystem functioning. During recent years, considerable progress has been made in the understanding of how aboveground parts of trees respond to drought and how these responses affect carbon assimilation. In contrast, processes of belowground parts are relatively underrepresented in research on climate change. In this review, we describe current knowledge about responses of tree roots to drought. Tree roots are capable of responding to drought through a variety of strategies that enable them to avoid and tolerate stress. Responses include root biomass adjustments, anatomical alterations, and physiological acclimations. The molecular mechanisms underlying these responses are characterized to some extent, and involve stress signaling and the induction of numerous genes, leading to the activation of tolerance pathways. In addition, mycorrhizas seem to play important protective roles. The current knowledge compiled in this review supports the view that tree roots are well equipped to withstand drought situations and maintain morphological and physiological functions as long as possible. Further, the reviewed literature demonstrates the important role of tree roots in the functioning of forest ecosystems and highlights the need for more research in this emerging field.

show abstract

Section: Tree Root Decomposability and The Role Of Roots For Organic mentioning

confidence: 99%

How tree roots respond to drought

et al. 2015

View full text Add to dashboard Cite

show abstract

“…A review of the literature suggests that the papers that focus specifically on mechanisms of destabilization largely emerge over the past decade (e.g. [6][7][8][9][10][11][12][13][14][15][16][17][18][19]), with a sharp increase in these sample publications in the past 3 years. It has become evident that the processes of C destabilization are not mere reversals of the processes of C stabilization.…”

Section: Introductionmentioning

confidence: 99%

What do we know about soil carbon destabilization?

Bailey

Pries

Lajtha

2019

Environ. Res. Lett.

144

106

View full text Add to dashboard Cite

Most empirical and modeling research on soil carbon (C) dynamics has focused on those processes that control and promote C stabilization. However, we lack a strong, generalizable understanding of the mechanisms through which soil organic carbon (SOC) is destabilized in soils. Yet a clear understanding of C destabilization processes in soil is needed to quantify the feedbacks of the soil C cycle to the Earth system. Destabilization includes processes that occur along a spectrum through which SOC shifts from a ‘protected’ state to an ‘available’ state to microbial cells where it can be mineralized to gaseous forms or to soluble forms that are then lost from the soil system. These processes fall into three general categories: (1) release from physical occlusion through processes such as tillage, bioturbation, or freeze-thaw and wetting-drying cycles; (2) C desorption from soil solids and colloids; and (3) increased C metabolism. Many processes that stabilize soil C can also destabilize C, and C gain or loss depends on the balance between competing reactions. For example, earthworms may both destabilize C through aggregate destruction, but may also create new aggregates and redistribute C into mineral horizon. Similarly, mycorrhizae and roots form new soil C but may also destabilize old soil C through priming and promoting microbial mining; labile C inputs cause C stabilization through increased carbon use efficiency or may fuel priming. Changes to the soil environment that affect the solubility of minerals or change the relative surfaces charges of minerals can destabilize SOC, including increased pH or in the reductive dissolution of Fe-bearing minerals. By considering these different physical, chemical, and biological controls as processes that contribute to soil C destabilization, we can develop thoughtful new hypotheses about the persistence and vulnerability of C in soils and make more accurate and robust predictions of soil C cycling in a changing environment.

show abstract

“…The importance of clay minerals for Organic Matter (OM) stabilization in soil environment has been recently demonstrated to show slower decomposition rates of OM associated with different mineral compounds (Kaiser et al, 2002;Dignac and Rumpel, 2012). In specific soils (Andosol, Spodosols, Histosols etc.)…”

Section: Introductionmentioning

confidence: 99%