Biogeochemistry of Decomposition and Detrital Processing

Sanderman, Jonathan; Amundson, R.

doi:10.1016/b978-0-08-095975-7.00807-x

Cited by 21 publications

(28 citation statements)

References 371 publications

(563 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ploughing mixes litter into soil, allowing better microbial access, and dampening extreme, fluctuating temperature and moisture conditions that occur on the surface (Burgess et al, 2002). Climatic conditions such as temperature and precipitation regulate decomposition by governing the size, activity and composition of microbial communities that mediate decomposition (Parr & Papendick, 1978;Jenkinson, 1981;Sanderman & Amundson, 2014).…”

Section: Introductionmentioning

confidence: 99%

Litter decay controlled by temperature, not soil properties, affecting future soil carbon

Gregorich

Janzen

Ellert

et al. 2016

Global Change Biology

View full text Add to dashboard Cite

Widespread global changes, including rising atmospheric CO 2 concentrations, climate warming and loss of biodiversity, are predicted for this century; all of these will affect terrestrial ecosystem processes like plant litter decomposition. Conversely, increased plant litter decomposition can have potential carbon-cycle feedbacks on atmospheric CO 2 levels, climate warming and biodiversity. But predicting litter decomposition is difficult because of many interacting factors related to the chemical, physical and biological properties of soil, as well as to climate and agricultural management practices. We applied 13 C-labelled plant litter to soil at ten sites spanning a 3500-km transect across the agricultural regions of Canada and measured its decomposition over five years. Despite large differences in soil type and climatic conditions, we found that the kinetics of litter decomposition were similar once the effect of temperature had been removed, indicating no measurable effect of soil properties. A two-pool exponential decay model expressing undecomposed carbon simply as a function of thermal time accurately described kinetics of decomposition. (R 2 = 0.94; RMSE = 0.0508). Soil properties such as texture, cation exchange capacity, pH and moisture, although very different among sites, had minimal discernible influence on decomposition kinetics. Using this kinetic model under different climate change scenarios, we projected that the time required to decompose 50% of the litter (i.e. the labile fractions) would be reduced by 1-4 months, whereas time required to decompose 90% of the litter (including recalcitrant fractions) would be reduced by 1 year in cooler sites to as much as 2 years in warmer sites. These findings confirm quantitatively the sensitivity of litter decomposition to temperature increases and demonstrate how climate change may constrain future soil carbon storage, an effect apparently not influenced by soil properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Litter decay controlled by temperature, not soil properties, affecting future soil carbon

Gregorich

Janzen

Ellert

et al. 2016

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…Terrestrial C may also be stored in solution in the soil in the form of dissolved organic carbon (DOC). DOC is a product of litter and fine root decomposition and is the critical substrate for microbial respiration; C which is not consumed by microbes moves downward in the soil profile to the mineral layers [ Kalbitz and Kaiser , ; Marschner and Kalbitz , ; Sanderman and Amundson , ] and may play a critical role in soil organic matter (SOM) stabilization [ Marin‐Spiotta et al ., ; Sollins et al ., ]. Factors influencing soil storage in both soil organic matter (SOM) and DOC at the global scale include temperature [ Prior et al ., ; Post and Kwon , ; Wynn et al ., ], forest community [ Guo and Gifford , ], mineralogy [ Six et al ., , , ], and available moisture [ Kalbitz and Kaiser , ; Marschner and Kalbitz , ; Prior et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Linking aboveground net primary productivity to soil carbon and dissolved organic carbon in complex terrain

Peterson

Lajtha

2013

JGR Biogeosciences

View full text Add to dashboard Cite

Factors influencing soil organic matter (SOM) stabilization and dissolved organic carbon (DOC) content in complex terrain, where vegetation, climate, and topography vary over the scale of a few meters, are not well understood. We examined the spatial correlations of lidar and geographic information system‐derived landscape topography, empirically measured soil characteristics, and current and historical vegetation composition and structure versus SOM fractions and DOC pools and leaching on a small catchment (WS1) in the H.J. Andrews Experimental Forest, located in the western Cascades Range of Oregon, USA. We predicted that aboveground net primary productivity (ANPP), litter fall, and nitrogen mineralization would be positively correlated with SOM, DOC, and carbon (C) content of the soil based on the principle that increased C inputs cause C stores in and losses from in the soil. We expected that in tandem, certain microtopographical and microclimatic characteristics might be associated with elevated C inputs and correspondingly, soil C stores and losses. We confirmed that on this site, positive relationships exist between ANPP, C inputs (litter fall), and losses (exportable DOC), but we did not find that these relationships between ANPP, inputs, and exports were translated to SOM stores (mg C/g soil), C content of the soil (% C/g soil), or DOC pools (determined with salt and water extractions). We suggest that the biogeochemical processes controlling C storage and lability in soil may relate to longer‐term variability in aboveground inputs that result from a heterogeneous and evolving forest stand.

show abstract

“…In aerobic decomposition the main products are: carbon dioxide, water and humic compounds. In anaerobic process, the mains products are carbon dioxide, methane, humic substances, mercaptans, molecular hydrogen, and sulfide hydrogen (Sanderman and Amundson, 2005).…”

Section: Introductionmentioning

confidence: 99%

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

2014

View full text Add to dashboard Cite

This study aimed at describing kinetic aspects of aerobic and anaerobic mineralization of Eicchornia azurea. The samples of aquatic macrophyte and water were collected in the Monjolinho Reservoir (22° 00' S and 47° 54' W). To determine the leachate potential, dried plant fragments were added to reservoir water, with sampling lasting for 4 months, where the particulate and dissolved organic carbon concentrations were measured. The kinetics of mass loss was obtained with 10 mineralization chambers for both aerobic and anaerobic conditions, with the plant fragments and reservoir water. Two additional chambers were used to monitor the volume of gases produced from anaerobic mineralization, with bioassays to determine oxygen uptake. The results were fitted to a first-order kinetic model, from which 27.21% of detritus corresponded to labile/soluble fractions and 72.62% to the refractory fractions. The decay rates for the global mass losses of the labile/soluble components were 2.07 day -1. DOC mineralization was not verified for either condition. Under aerobic condition, the mass loss constant rate (0.0029 day -1 ) for the refractory fractions was 2.4 the value for the anaerobic one. Under anaerobic condition, the gases formation occurred in three phases. Based on these results, in the Monjolinho Reservoir, the decomposition of E. azurea that undergo within the water column and in upper layers of sediment is a faster process, favoring the mineralization. In contrast, in the lower layers of sediment the diagenetic processes (i.e. humus production and accumulation of organic matter) are favored.Keywords: decay, oxygen consumption, gases formation, aquatic macrophyte, Monjolinho Reservoir. Implicações da decomposição aeróbia e anaeróbia de Eichhornia azurea (Sw.)Kunth. na ciclagem de carbono em um reservatório subtropical ResumoNesse estudo descreveram-se aspectos cinéticos da decomposição aeróbia e anaeróbia de Eichhornia azurea. As amostras da macrófita aquática e de água foram coletadas no reservatório do Monjolinho (22° 00' S e 47° 54' O). Para a determinação do potencial de lixiviação, adicionaram-se fragmentos de planta (previamente secos) em água do reservatório. Nos experimentos de decomposição, as amostragens foram realizadas durante 4 meses e quantificaram-se as frações particuladas e dissolvidas de carbono. Para descrever as cinéticas de perda de massa, para cada condição (aeróbia e anaeróbia) foram preparadas 10 incubações contento fragmentos de plantas e água do reservatório. A cada dia de amostragem as frações particuladas e dissolvidas de carbono orgânico foram quantificadas. Foram também preparadas 2 câmaras para registrar a formação de gases da degradação anaeróbia e o consumo de oxigênio na degradação aeróbia. Os resultados foram ajustados a um modelo cinético de 1ª ordem. Verificou-se que 27,21% dos detritos corresponderam à fração lábil/solúvel e 72,62% à refratária. O coeficiente global de perda de massa das frações lábeis/solúveis foi 2,07 dia -1 . Nas duas condições não houve mineralização ...

show abstract

Biogeochemistry of Decomposition and Detrital Processing

Cited by 21 publications

References 371 publications

Litter decay controlled by temperature, not soil properties, affecting future soil carbon

Litter decay controlled by temperature, not soil properties, affecting future soil carbon

Linking aboveground net primary productivity to soil carbon and dissolved organic carbon in complex terrain

Implication of anaerobic and aerobic decomposition of Eichhornia azurea (Sw.) Kunth. on the carbon cycling in a subtropical reservoir

Contact Info

Product

Resources

About