Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Interactions among decaying leaf litter, root litter and soil organic matter vary with mycorrhizal type

Journal Article · · Journal of Ecology
 [1];  [2];  [3];  [1];  [1]
  1. Department of Biology Indiana University Bloomington IN USA
  2. Department of Biology Indiana University Bloomington IN USA, Program in Atmospheric and Oceanic Sciences Princeton University Princeton NJ USA
  3. Department of Biology Indiana University Bloomington IN USA, Department of Biology West Virginia University Morgantown WV USA
Abstract

Root‐derived inputs are increasingly viewed as primary controls of soil organic matter (SOM) formation; however, we have a limited understanding of how root decay rates depend on soil factors, and how decaying roots influence the breakdown of leaf litter and SOM.

We incubated root and leaf litter (alone and in combination) from arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) trees in soils collected from forest plots dominated by AM and ECM trees in a factorial design. In each microcosm, we quantified litter decay rates and the effects of decaying litters on soil C balance. We hypothesized that (1) AM root litters would decompose faster than ECM root litters, (2) root litter decay would be greatest when decomposed in “home” soils (e.g. AM litters in AM soils and ECM litters in ECM soils) and (3) root and leaf litters would decompose faster when decaying in the same microcosms than when decaying in separate microcosms, resulting in the largest CO 2 losses.

Overall, AM root litter decomposed faster than ECM root litter, and the magnitude of this effect depended on soil origin. AM litters decayed fastest in AM soils, but ECM and mixed AM–ECM litters were unaffected by soil origin. Decaying roots increased leaf litter mass loss, but only in microcosms containing soils of the same origin (e.g. AM litters in AM soils; mixed litters in mixed soils).

Carbon losses were dominated by microbial respiration, and the magnitude of this flux depended on litter type and soil origin. When leaves and roots decayed together, respiratory losses exceeded those from microcosms containing leaves and roots alone, with the largest losses occurring in each litters' “home” soil. In AM soils, elevated losses were driven by roots accelerating leaf decay, while in ECM soils, elevated losses resulted from roots and leaves accelerating the decay of SOM; in mixed soils, root‐induced increases in leaf and SOM decay contributed to elevated C losses.

Synthesis . Our results suggest that root, leaf and SOM decay are intertwined, and that measurements of these processes in isolation may lead to incorrect estimates of the magnitude and source of C losses from soils.

Sponsoring Organization:
USDOE
OSTI ID:
1420334
Journal Information:
Journal of Ecology, Journal Name: Journal of Ecology Journal Issue: 2 Vol. 106; ISSN 0022-0477
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (65)

Resource stoichiometry and the biogeochemical consequences of nitrogen deposition in a mixed deciduous forest journal December 2016
Fine root decomposition rates do not mirror those of leaf litter among temperate tree species journal October 2009
Slow decomposition of lower order roots: a key mechanism of root carbon and nutrient retention in the soil journal January 2010
Global patterns in root decomposition: comparisons of climate and litter quality effects journal November 2001
Carbon cycling traits of plant species are linked with mycorrhizal strategy journal December 2001
Litter decomposition: what controls it and how can we alter it to sequester more carbon in forest soils? journal April 2010
A new conceptual model on the fate and controls of fresh and pyrolized plant litter decomposition journal February 2015
Effects of litter traits, soil biota, and soil chemistry on soil carbon stocks at a common garden with 14 tree species journal March 2015
Rapid fine root C and N mineralization in a northern temperate forest soil journal March 2016
Is soil carbon mostly root carbon? Mechanisms for a specific stabilisation journal February 2005
Maintaining connectivity: understanding the role of root order and mycelial networks in fine root decomposition of woody plants journal September 2017
Do plant species encourage soil biota that specialise in the rapid decomposition of their litter? journal January 2006
Quality of soluble organic C, N, and P produced by different types and species of litter: Root litter versus leaf litter journal November 2012
Correction factors for dissolved organic carbon extracted from soil, measured using the Mn(III)-pyrophosphate colorimetric method adapted for a microplate reader journal November 2014
Contribution of exudates, arbuscular mycorrhizal fungi and litter depositions to the rhizosphere priming effect induced by grassland species journal January 2015
Fine root decomposition, nutrient mobilization and fungal communities in a pine forest ecosystem journal April 2015
Plant species effects on nutrient cycling: revisiting litter feedbacks journal June 2015
Carbon balance of the terrestrial biosphere in the Twentieth Century: Analyses of CO 2 , climate and land use effects with four process-based ecosystem models journal March 2001
Persistence of soil organic matter as an ecosystem property journal October 2011
Mycorrhiza-mediated competition between plants and decomposers drives soil carbon storage journal January 2014
Soil carbon release enhanced by increased tropical forest litterfall journal August 2011
Long-term dynamics of pine and hardwood litter in contrasting environments: toward a global model of decomposition journal October 2000
Mycorrhizas and nutrient cycling in ecosystems - a journey towards relevance? journal March 2003
Root morphology and mycorrhizal symbioses together shape nutrient foraging strategies of temperate trees journal July 2016
Plant traits and decomposition: are the relationships for roots comparable to those for leaves? journal December 2011
Linking litter decomposition of above- and below-ground organs to plant-soil feedbacks worldwide journal June 2013
The world-wide ‘fast-slow’ plant economics spectrum: a traits manifesto journal February 2014
Decay rates of leaf litters from arbuscular mycorrhizal trees are more sensitive to soil effects than litters from ectomycorrhizal trees journal October 2015
Mycorrhizal associations of trees have different indirect effects on organic matter decomposition journal July 2016
Ectomycorrhizal fungi slow soil carbon cycling journal June 2016
Feedbacks between plant N demand and rhizosphere priming depend on type of mycorrhizal association journal July 2017
The Microbial Efficiency-Matrix Stabilization (MEMS) framework integrates plant litter decomposition with soil organic matter stabilization: do labile plant inputs form stable soil organic matter? journal February 2013
Faster turnover of new soil carbon inputs under increased atmospheric CO 2 journal June 2017
Controls on long-term root and leaf litter decomposition in neotropical forests journal May 2009
Long-term patterns of mass loss during the decomposition of leaf and fine root litter: an intersite comparison journal May 2009
Tree species identity alters forest litter decomposition through long-term plant and soil interactions in Patagonia, Argentina journal July 2008
Multiple mechanisms for trait effects on litter decomposition: moving beyond home-field advantage with a new hypothesis journal January 2012
Ectomycorrhizal colonization slows root decomposition: the post-mortem fungal legacy journal August 2006
Plant species traits are the predominant control on litter decomposition rates within biomes worldwide journal October 2008
Thermal adaptation of soil microbial respiration to elevated temperature journal December 2008
Enhanced root exudation induces microbial feedbacks to N cycling in a pine forest under long-term CO2 fumigation: Rhizosphere feedbacks in CO2-enriched forests journal December 2010
Can ectomycorrhizal colonization of Pinus resinosa roots affect their decomposition? journal March 2011
Predicting fine root lifespan from plant functional traits in temperate trees journal June 2012
The mycorrhizal-associated nutrient economy: a new framework for predicting carbon-nutrient couplings in temperate forests journal April 2013
Synthesis and modeling perspectives of rhizosphere priming journal August 2013
Mycorrhizal type determines the magnitude and direction of root-induced changes in decomposition in a temperate forest journal January 2015
Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees journal October 2015
Root structure-function relationships in 74 species: evidence of a root economics spectrum related to carbon economy journal January 2016
Similar below-ground carbon cycling dynamics but contrasting modes of nitrogen cycling between arbuscular mycorrhizal and ectomycorrhizal forests journal September 2016
Dominant mycorrhizal association of trees alters carbon and nutrient cycling by selecting for microbial groups with distinct enzyme function journal December 2016
Mycorrhizal fungi as drivers and modulators of terrestrial ecosystem processes journal January 2017
A global Fine-Root Ecology Database to address below-ground challenges in plant ecology journal February 2017
Ecosystem responses to elevated CO 2 governed by plant-soil interactions and the cost of nitrogen acquisition journal November 2017
Global-Scale Similarities in Nitrogen Release Patterns During Long-Term Decomposition journal January 2007
Mycorrhizal association as a primary control of the CO 2 fertilization effect journal June 2016
The Ecology of Soil Carbon: Pools, Vulnerabilities, and Biotic and Abiotic Controls journal November 2017
Quantifying Fine-Root Decomposition: an Alternative to Buried Litterbags journal November 2002
Decomposition of the finest root branching orders: linking belowground dynamics to fine-root function and structure journal February 2011
Variability in root production, phenology, and turnover rate among 12 temperate tree species journal August 2014
Vegetation exerts a greater control on litter decomposition than climate warming in peatlands journal January 2015
Colorimetric Determination of Oxidizable Carbon in Acid Soil Solutions journal January 1988
Litter and Root Manipulations Provide Insights into Soil Organic Matter Dynamics and Stability journal January 2014
Nitrogen and Lignin Control of Hardwood Leaf Litter Decomposition Dynamics journal June 1982
Nitrogen Limitation of Production and Decomposition in Prairie, Mountain Meadow, and Pine Forest journal August 1988
Fine Root Productivity and Turnover of Ectomycorrhizal and Arbuscular Mycorrhizal Tree Species in a Temperate Broad-Leaved Mixed Forest journal August 2016

Similar Records

Arctic shrub expansion generates regional variation in litter decomposition by altering litter quality and the decomposition environment
Journal Article · Tue Apr 29 20:00:00 EDT 2025 · Functional Ecology · OSTI ID:2563663

Fine roots are the dominant source of recalcitrant plant litter in sugar maple‐dominated northern hardwood forests
Journal Article · Thu Jun 11 20:00:00 EDT 2015 · New Phytologist · OSTI ID:1224020

Related Subjects