Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Open soil science: technology is helping us discover the mysteries under our feet
Hobley, E.U. ; Schultze, D.G. ; Robinson, D.A. ; Jahanshiri, E. ; Aitkenhead, M. ; Batjes, N.H. ; Hengl, T. - \ 2017
The Conversation
Modeling soil processes : Review, key challenges, and new perspectives
Vereecken, H. ; Schnepf, A. ; Hopmans, J.W. ; Javaux, M. ; Or, D. ; Roose, T. ; Vanderborght, J. ; Young, M.H. ; Amelung, W. ; Aitkenhead, M. ; Allison, S.D. ; Assouline, S. ; Baveye, P. ; Berli, M. ; Brüggemann, N. ; Finke, P. ; Flury, M. ; Gaiser, T. ; Govers, G. ; Ghezzehei, T. ; Hallett, P. ; Hendricks Franssen, H.J. ; Heppell, J. ; Horn, R. ; Huisman, J.A. ; Jacques, D. ; Jonard, F. ; Kollet, S. ; Lafolie, F. ; Lamorski, K. ; Leitner, D. ; Mcbratney, A. ; Minasny, B. ; Montzka, C. ; Nowak, W. ; Pachepsky, Y. ; Padarian, J. ; Romano, N. ; Roth, K. ; Rothfuss, Y. ; Rowe, E.C. ; Schwen, A. ; Šimůnek, J. ; Tiktak, A. ; Dam, Jos van; Zee, S.E.A.T.M. van der; Vogel, H.J. ; Vrugt, J.A. ; Wöhling, T. ; Wöhling, T. ; Young, I.M. - \ 2016
Vadose Zone Journal 15 (2016)5. - ISSN 1539-1663 - 57 p.

The remarkable complexity of soil and its importance to a wide range of ecosystem services presents major challenges to the modeling of soil processes. Although major progress in soil models has occurred in the last decades, models of soil processes remain disjointed between disciplines or ecosystem services, with considerable uncertainty remaining in the quality of predictions and several challenges that remain yet to be addressed. First, there is a need to improve exchange of knowledge and experience among the different disciplines in soil science and to reach out to other Earth science communities. Second, the community needs to develop a new generation of soil models based on a systemic approach comprising relevant physical, chemical, and biological processes to address critical knowledge gaps in our understanding of soil processes and their interactions. Overcoming these challenges will facilitate exchanges between soil modeling and climate, plant, and social science modeling communities. It will allow us to contribute to preserve and improve our assessment of ecosystem services and advance our understanding of climate-change feedback mechanisms, among others, thereby facilitating and strengthening communication among scientific disciplines and society. We review the role of modeling soil processes in quantifying key soil processes that shape ecosystem services, with a focus on provisioning and regulating services. We then identify key challenges in modeling soil processes, including the systematic incorporation of heterogeneity and uncertainty, the integration of data and models, and strategies for effective integration of knowledge on physical, chemical, and biological soil processes. We discuss how the soil modeling community could best interface with modern modeling activities in other disciplines, such as climate, ecology, and plant research, and how to weave novel observation and measurement techniques into soil models. We propose the establishment of an international soil modeling consortium to coherently advance soil modeling activities and foster communication with other Earth science disciplines. Such a consortium should promote soil modeling platforms and data repository for model development, calibration and intercomparison essential for addressing contemporary challenges.

Spectral analysis of coniferous foliage and possible links to soil chemistry: Are spectral chlorophyll indices related to forest floor dissolved organic C and N?
Albrechtová, J. ; Seidl, Z. ; Aitkenhead Peterson, J. ; Lhotáková, Z. ; Rock, B.N. ; Alexander, J.E. ; Malenovsky, Z. ; McDowell, W.H. - \ 2008
Science of the Total Environment 404 (2008)2-3. - ISSN 0048-9697 - p. 424 - 432.
stream water - red spruce - nitrogen - matter - reflectance - carbon - polyphenols - ecosystems - dynamics - needles
Dissolved organic matter in soils can be predicted from forest floor C:N ratio, which in turn is related to foliar chemistry. Little is known about the linkages between foliar constituents such as chlorophylls, lignin, and cellulose and the concentrations of water-extractable forest floor dissolved organic carbon and dissolved organic nitrogen. Lignin and cellulose are not mobile in foliage and thus may be indicative of growing conditions during prior years, while chlorophylls respond more rapidly to the current physiological status of a tree and reflect nutrient availability. The aim of this study was to examine potential links among spectral foliar data, and the organic C and N of forest soils. Two coniferous species (red spruce and balsam fir) were studied in the White Mountains of New Hampshire, USA. Six trees of each species were sampled at 5 watersheds (2 in the Hubbard Brook Experimental Forest, 3 in the Bartlett Experimental Forest). We hypothesized that in a coniferous forest, chemistry of old foliage would better predict the chemical composition of the forest floor litter layer than younger foliage, which is the more physiologically active and the most likely to be captured by remote sensing of the canopy. Contrary to our expectations, chlorophyll concentration of young needles proved to be most tightly linked to soil properties, in particular water-extractable dissolved organic carbon. Spectral indices related to the chlorophyll content of needles could be used to predict variation in forest floor dissolved organic carbon and dissolved organic nitrogen. Strong correlations were found between optical spectral indices based on chlorophyll absorption and forest floor dissolved organic carbon, with higher foliage chlorophyll content corresponding to lower forest floor dissolved organic carbon. The mechanisms behind these correlations are uncertain and need further investigation. However, the direction of the linkage from soil to tree via nutrient availability is hypothetized based on negative correlations found between foliar N and forest floor dissolved organic carbon.
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