Hydrological properties of duff

Raaflaub, L. D.; Valeo, Caterina

doi:10.1029/2008wr007396

Cited by 15 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results are also in a good agreement with the estimates of Romanovsky and Osterkamp (2000 ; Table 1) based on interpretation of high-resolution and high-precision temperature measurements from a black spruce forest site in the Bonanza Creek LTER research area (0.1 W m j1 K j1 for the living moss, 0.3 W m j1 K j1 for the dead moss, and 0.5 W m j1 K j1 for the peat layer). Our measurements and calculations of organic horizon physical properties were also consistent with other reported values for bulk density (O'Neill et al, 2003), porosity (Raaflaub and Valeo, 2009), and field capacity (Yoshikawa et al, 2003). We observed substantive differences in K t values between moss types, which can, in part, be explained by differences in physical and ecophysiological properties of each moss.…”

Section: Controls On Thermal Conductivity Of Organic Horizonssupporting

confidence: 90%

The Effect of Moisture Content on the Thermal Conductivity of Moss and Organic Soil Horizons From Black Spruce Ecosystems in Interior Alaska

O’Donnell¹,

Romanovsky

Harden³

et al. 2009

Soil Science

160

140

View full text Add to dashboard Cite

Organic soil horizons function as important controls on the thermal state of near-surface soil and permafrost in high-latitude ecosystems. The thermal conductivity of organic horizons is typically lower than mineral soils and is closely linked to moisture content, bulk density, and water phase. In this study, we examined the relationship between thermal conductivity and soil moisture for different moss and organic horizon types in black spruce ecosystems of interior Alaska. We sampled organic horizons from feather mossYdominated and Sphagnumdominated stands and divided horizons into live moss and fibrous and amorphous organic matter. Thermal conductivity measurements were made across a range of moisture contents using the transient line heat source method. Our findings indicate a strong positive and linear relationship between thawed thermal conductivity (K t ) and volumetric water content. We observed similar regression parameters (A or slope) across moss types and organic horizons types and small differences in A 0 ( y intercept) across organic horizon types. Live Sphagnum spp. had a higher range of K t than did live feather moss because of the field capacity (laboratory based) of live Sphagnum spp. In northern regions, the thermal properties of organic soil horizons play a critical role in mediating the effects of climate warming on permafrost conditions. Findings from this study could improve model parameterization of thermal properties in organic horizons and enhance our understanding of future permafrost and ecosystem dynamics.

show abstract

Section: Controls On Thermal Conductivity Of Organic Horizonssupporting

confidence: 90%

The Effect of Moisture Content on the Thermal Conductivity of Moss and Organic Soil Horizons From Black Spruce Ecosystems in Interior Alaska

O’Donnell¹,

Romanovsky

Harden³

et al. 2009

Soil Science

160

140

View full text Add to dashboard Cite

show abstract

“…It might specifically concern those involving large particles staying on the surface of the soil (such as typical farmyard manures), solid fractions of separated slurry, solid agrifood industry and sewage sludge, etc. It should be particularly suitable for compost, which is very dry and contains large, fibrous organic particles, and for which specific hydraulic measurements have already been established (DresboU and Thorup-Kristensen, 2005;Raaflaub and Valeo, 2009;Wallach et al, 1992). The challenge will be to realistically account for infiltration of rain or irrigation water that will transport NHj^-N from the compost into the soil.…”

Section: Accounting For Various Kinds Of Organic Materials On Soil Sumentioning

confidence: 98%

Accounting for Surface Cattle Slurry in Ammonia Volatilization Models: The Case of Volt'Air

Garcia

Génermont

Bedos

et al. 2012

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Process based models have been developed to simulate ammonia (NH3) volatilization after surface slurry spreading, but none of them have managed to realistically represent slurry infiltration into the soil and the development of a specific slurry interface that modifies surface temperature and humidity conditions. To account for these physical effects, it is proposed to add to the model a layer of slurry on the surface of the soil. It is hypothesized that the slurry layer can be regarded as a soil layer from the hydrological point of view, characterized by its specific hydraulic parameters, and whose thickness depends on the quantity and bulk density of the slurry dry matter. An assessment was performed by comparisons with measurements of NH3 volatilization fluxes from two specific datasets. The addition of the slurry layer clearly improved the simulations of both the NH3 volatilization flux and ammoniacal nitrogen (NH^-N) distribution in the soil. This concept together with its parameterization proved to be relevant for accounting for effect of the slurry application rates on volatilization, and subsequent abatement obtained with band spreading. The efficiency factor was improved from -0.35 to 0.71. This concept also succeeded in describing the slurry layer state over the whole range from slurry ponding at the surface to the dried-out state, via a slurry in an intermediate drying state. This was actually a prerequisite for the good simulation of NH3 volatilization over the whole volatilization event. This approach is promising for extension to various organic materials present at the soil surface.

show abstract

“…Limited information exists about the properties of duff that are necessary for its incorporation into physical models of rainfall infiltration. Duff properties in our study were obtained from Raaflaub and Valeo, ; Keith et al , ; Valeo (pers. comm.…”

Section: Modelling the Role Of Duff In Infiltrationmentioning

confidence: 99%

“…There are several possible fates for rainfall if it enters into the coupled duff/soil system (Laurén and Mannerkoski, ; Raaflaub and Valeo, ; Keith et al , ). The infiltration capacity of the duff layer most often exceeds the rainfall rate (and that of the underlying mineral soil), and water enters the duff layer.…”

Section: Modelling the Role Of Duff In Infiltrationmentioning

confidence: 99%

Negligible soil erosion in a burned mountain watershed, Canadian Rockies: field and modelling investigations considering the role of duff

Martin

Johnson

Gallaway

et al. 2011

Earth Surf Processes Landf

View full text Add to dashboard Cite

Increased soil erosion in immediate post-wildfire years has been well documented in the literature, but many unanswered questions remain about the factors controlling erosional responses in different regional settings. The field site for the present study was located in a closed canopy, subalpine forest in Kootenay National Park, British Columbia that was subjected to a high-intensity crown fire in the summer of 2003. Low soil erosion values were documented at the study site in the years immediately following the 2003 wildfire, with estimates ranging from approximately 10 -1 up to 10 0 t ha -1 . Following the wildfire, notable duff coverage (the duff layer is the combined fermentation and humus soil organic layers) remained above the mineral soil. This finding supports earlier studies documenting only partial duff consumption by high-intensity wildfires in the boreal forest of Canada. It is postulated that remnant duff coverage after many high-intensity wildfires impacts the hydrological and soil erosional response to rainstorm events in post-wildfire years. In particular, duff provides detention storage for infiltrating rainfall and, therefore, may inhibit the generation of overland flow. Furthermore, duff also provides a physical barrier to soil erosion. The GreenAmpt model of rainfall infiltration is employed to better assess how interactions between rainfall duration/intensity and soil/duff properties affect hydrological response and the generation of overland flow. Model results show that duff provides an effective zone for detention storage and that duff accommodates all rainfall intensities to which it was subjected without the occurrence of surface ponding. In addition, the penetration of the wetting front is relatively slow in duff due to its high porosity and water storage potential.

show abstract

Hydrological properties of duff

Cited by 15 publications

References 14 publications

The Effect of Moisture Content on the Thermal Conductivity of Moss and Organic Soil Horizons From Black Spruce Ecosystems in Interior Alaska

The Effect of Moisture Content on the Thermal Conductivity of Moss and Organic Soil Horizons From Black Spruce Ecosystems in Interior Alaska

Accounting for Surface Cattle Slurry in Ammonia Volatilization Models: The Case of Volt'Air

Negligible soil erosion in a burned mountain watershed, Canadian Rockies: field and modelling investigations considering the role of duff

Contact Info

Product

Resources

About