Výsledky vyhledávání - "R. David Hammer"

Runoff and Sediment from Row-crop, Row-crop with Grass Strips, Pasture, and Forest Watersheds

Autor: Gray S. Henderson, R. David Hammer, Ranjith P. Udawatta, John R. Jones

Publikováno v: Revue des sciences de l'eau. 19:137-149

Comparisons of runoff and sediment loss from row-crop with and without riparian buffers, pasture and grass filter strips are limited. Effects of precipitation, landuse and buffer condition on runoff and sediment loss were examined from 1997 to 1999 i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::865da2107dbcd4025f1ebc387d3dcf1c
https://doi.org/10.7202/013047ar

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Minirhizotron quantification of soybean root growth as affected by reduced A horizon in soil

Autor: R. David Hammer, John Yang, Robert W. Blanchar

Publikováno v: Journal of Plant Nutrition and Soil Science. 166:708-711

Shallow soil A horizon (topsoil) caused by soil erosion and soil movement from cultivation is known to reduce soil and crop productivity. The reduction may be related to limitation of root growth. A field study was conducted to investigate the effect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0975c52fdf534d1624bbdcc434906f1d
https://doi.org/10.1002/jpln.200321193

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Carbon Distribution in Subalpine Forests and Meadows of the Olympic Mountains, Washington

Autor: David L. Peterson, Susan J. Prichard, R. David Hammer

Publikováno v: Soil Science Society of America Journal. 64:1834-1845

Estimates of C storage in mountainous regions are rare. Forest–meadow ecotones in subalpine ecosystems, which contain a mosaic of forests and meadows, may be particularly sensitive to future changes in climate and are therefore important to include

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7fd3be183379418bc8345ee81de714df
https://doi.org/10.2136/sssaj2000.6451834x

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Evaluating Central Tendency and Variance of Soil Properties within Map Units

Autor: Fred J. Young, Frederick Williams, R. David Hammer

Publikováno v: Soil Science Society of America Journal. 62:1640-1646

Users are demanding that soil surveys contain statistical information about soil and map unit properties. Numerous sampling and statistical methodologies are available, but statistical methods should be appropriate for both sampling methods and data

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0680c70b33bfb02ba84659d19dacc3c4
https://doi.org/10.2136/sssaj1998.03615995006200060022x

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Estimation of Map Unit Composition from Transect Data

Autor: R. David Hammer, Fred J. Young, Frederick Williams

Publikováno v: Soil Science Society of America Journal. 61:854-861

We are concerned with the documentation of taxonomic variability within soil survey map units, and how that variability is expressed statistically. Twelve randomly selected transects were used to sample soil properties and classify pedons within a fl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa2655eb76707b4d781a48dd31961d61
https://doi.org/10.2136/sssaj1997.03615995006100030020x

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