Molecular Weight of Dissolved Organic Carbon, Nitrogen, and Phenolics in Grassland Soils

Jones, Davey L.; Willett, Victoria B.; Stockdale, E.; Macdonald, A. J.; Murphy, Daniel V.

doi:10.2136/sssaj2011.0252

Cited by 29 publications

(11 citation statements)

References 43 publications

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“…In seasonal deciduous forests at the onset of the wet season, the litter with higher energy availability, in the form of dissolved organic carbon, promotes a higher Eur J Forest Res microbial activity releasing nutrients from organic compounds (Eaton 2001;García-Oliva et al 2003;Don and Kalbitz 2005;Aponte et al 2010;Jones et al 2012). In our study, Q. deserticola litter had higher available NH 4 ?…”

Section: Litterfall Quality Controls Litter and Soil Nutrient Availabsupporting

confidence: 48%

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

et al. 2015

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Foliar nutrient resorption (FNR) is a key process in the dynamics of nutrients in a forest ecosystem. Along with other factors, FNR regulates the chemical composition of the forest floor and, consequently, the rates of organic matter decomposition and soil nutrient availability. The main objective of the present study was to examine the effect of FNR of two deciduous oak species (Quercus castanea and Q. deserticola) in the litter and soil nutrient dynamics, in addition to analyze whether the interaction between two species was positive (synergistic) or negative (antagonistic) through the mixed litter from two species. For this purpose, the nutrient concentration of green leaves, litterfall, litter and soil was measured, as well as soil microbial activity. These measurements were taken in isolated stands with the presence of one of the oak species and stands with the two oak species mixed. Quercus deserticola, with lower FNR, produced litter with a higher N concentration, which apparently enhancing microbial activity in the forest floor litter and increased nutrient transformations and soil fertility. In contrast, Q. castanea has a higher FNR and produced litter with a lower nutrient concentration. The microbial soil community associated with Q. castanea must therefore invest more energy in metabolic processes at the expense of biomass growth. However, forest floor nutrient transformations were more intense and soil fertility increased in areas where both species intermix; in this case, the latter species received the rich-nutrient litterfall of Q. deserticola. These results suggest a strong footprint of species traits on microbial activities and soil nutrient transformations.

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Section: Litterfall Quality Controls Litter and Soil Nutrient Availabsupporting

confidence: 48%

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

et al. 2015

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“…This may reflect adsorption of DOC to the high percentage clay fraction of the soil [ Neff and Asner , ] and the small number of wetting cycles [ Fierer and Schimel , ]. Our determinations relied on chemical extraction which may damage microbial cells, release physically trapped DOC [ Jones and Willett , ], and preferentially extract high molecular weight compounds from the soil [ Jones et al , ]. Our DOC values may therefore represent a homogenized and inflated high molecular weight organic pool that does not reflect the DOC driving soil surface CO 2 flux [ van Hees et al , ].…”

Section: Discussionmentioning

confidence: 99%

Unifying soil respiration pulses, inhibition, and temperature hysteresis through dynamics of labile soil carbon and O₂

Oikawa

Grantz

Chatterjee

et al. 2014

J. Geophys. Res. Biogeosci.

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Event-driven and diel dynamics of soil respiration (R s ) strongly influence terrestrial carbon (C) emissions and are difficult to predict. Wetting events may cause a large pulse or strong inhibition of R s . Complex diel dynamics include hysteresis in the relationship between R s and soil temperature. The mechanistic basis for these dynamics is not well understood, resulting in large discrepancies between predicted and observed R s . We present a unifying approach for interpreting these phenomena in a hot arid agricultural environment. We performed a whole ecosystem wetting experiment with continuous measurement of R s to study pulse responses to wetting in a heterotrophic system. We also investigated R s during cultivation of Sorghum bicolor to evaluate the role of photosynthetic C in the regulation of diel variation in R s . Finally, we adapted a R s model with sensitivity to soil O 2 and water content by incorporating two soil C pools differing in lability. We observed a large wetting-induced pulse of R s from the fallow field and were able to accurately simulate the pulse via release of labile soil C. During the exponential phase of plant growth, R s was inhibited in response to wetting, which was accurately simulated through depletion of soil O 2 . Without plants, hysteresis was not observed; however, with growing plants, an increasingly significant counterclockwise hysteresis developed. Hysteresis was simulated via a dynamic photosynthetic C pool and was not likely controlled by physical processes. These results help characterize the complex regulation of R s and improve understanding of these phenomena under warmer and more variable conditions.

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“…Thus, the properties of the LMW fraction depend largely on its origin. Also, the extraction technique used seems to greatly affect the properties measured (Jones et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Properties of Dissolved Organic Matter in Peatland: Implications for Water Quality after Harvest

Kiikkilä

Smolander

Ukonmaanaho

2014

Vadose Zone Journal

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We studied the properties of dissolved organic matter (DOM) in drained boreal peatland in stem‐only‐harvested (SOH), whole‐tree‐harvested (WTH), and unharvested sites. The DOM derived from both aerobic and anaerobic peat layers was divided into four different molecular‐weight fractions with ultrafiltration, and the fractions were measured for the concentrations of dissolved organic C (DOC), N, and carbohydrates, aromaticity (specific ultraviolet [UV] absorbance at 254 nm), pH, and bioavailability to bacteria. The percentage of DOC in the low‐molecular‐weight (LMW) fraction was higher in the deeper than in the upper layer. We suggest that easily degradable LMW compounds with low aromatic character and high bioavailability had not degraded in the deeper layer under anaerobic conditions. This had produced a relative enrichment of LMW DOC in the anaerobic layer. A different relation to aerobicity was observed in alternating aerobic conditions in the upper layer alone, where the high‐molecular‐weight compounds seemed to increase under more anaerobic conditions. Thus the properties and processes of DOM in peatlands seem to be controlled by the aerobicity in a complicated manner. We suggest that operations that affect the water table level in peatland affect also the properties of peat DOM. The properties of DOM that could be connected to clear‐cut harvest‐induced changes in the recent inputs of C and N were small. Peat DOM was more N rich in harvested than in control sites. Thus it seems possible that N is susceptible to leaching after harvest in naturally relatively N‐rich sites and especially in mineral form.

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Molecular Weight of Dissolved Organic Carbon, Nitrogen, and Phenolics in Grassland Soils

Cited by 29 publications

References 43 publications

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

Unifying soil respiration pulses, inhibition, and temperature hysteresis through dynamics of labile soil carbon and O₂

Properties of Dissolved Organic Matter in Peatland: Implications for Water Quality after Harvest

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Molecular Weight of Dissolved Organic Carbon, Nitrogen, and Phenolics in Grassland Soils

Cited by 29 publications

References 43 publications

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico

Unifying soil respiration pulses, inhibition, and temperature hysteresis through dynamics of labile soil carbon and O2

Properties of Dissolved Organic Matter in Peatland: Implications for Water Quality after Harvest

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Unifying soil respiration pulses, inhibition, and temperature hysteresis through dynamics of labile soil carbon and O₂