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Nikolaus J. Kuhn   Professor  Other 
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Nikolaus J. Kuhn published an article in December 2017.
Top co-authors See all
Yuxia Li

41 shared publications

Key Laboratory for Robot & Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao, China

Rorke B. Bryan

37 shared publications

Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, M5S 3B3, ON, Canada

K.M. Rowntree

21 shared publications

Rhodes University

Peter Scarth

14 shared publications

These authors contributed equally to this work

Simon Pulley

14 shared publications

Rothamsted Research; North Wyke, Okehampton, Devon UK

9
Publications
16
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17
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Publication Record
Distribution of Articles published per year 
(2002 - 2017)
Total number of journals
published in
 
8
 
Publications See all
Article 2 Reads 0 Citations Bequest of the Norseman—The Potential for Agricultural Intensification and Expansion in Southern Greenland under Climate... Chatrina Caviezel, Matthias Hunziker, Nikolaus J. Kuhn Published: 07 December 2017
Land, doi: 10.3390/land6040087
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The increase of summer temperatures and a prolonged growing season increase the potential for agricultural land use for subarctic agriculture. Nevertheless, land use at borderline ecotones is influenced by more factors than temperature and the length of the growing season, for example soil quality, as the increasing lengths of dry periods during vegetation season can diminish land use potential. Hence, this study focuses on the quality of the soil resource as possible limiting factor for land use intensification in southern Greenland. Physical and chemical soil properties of cultivated grasslands, reference sites and semi-natural birch and grassland sites were examined to develop a soil quality index and to identify the suitability of soils for a sustainable intensification and expansion of the agriculture. The study revealed that soils in the study area are generally characterized by a low effective cation exchange capacity (CECeff) (3.7 ± 5.0 meq 100 g−1), low pH CaCl2 (4.6 ± 0.4) and low clay and silt content (3.0 ± 1.0% and 38.2 ± 4.7%, respectively). Due to the high amount of coarse fraction (59.1 ± 5.8%) and the low amount of soil nutrients, an increasing threat of dry spells for soils and yield could be identified. Further, future land use intensification and expansion bears a high risk for concomitant effects, namely further soil acidification, nutrient leaching and soil degradation processes. However, results of the soil quality index also indicate that sites which were already used by the Norseman (980s–1450) show the best suitability for agricultural use. Thus, these areas offer a possibility to expand agricultural land use in southern Greenland.
Article 1 Read 0 Citations Green alder encroachment in the European Alps: The need for analyzing the spread of a native-invasive species across spa... Chatrina Caviezel, Matthias Hunziker, Nikolaus J. Kuhn Published: 01 December 2017
CATENA, doi: 10.1016/j.catena.2017.08.006
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Article 2 Reads 0 Citations Estimating aboveground woody biomass change in Kalahari woodland: combining field, radar, and optical data sets Vladimir R. Wingate, Stuart R Phinn, Nikolaus Kuhn, Peter Sc... Published: 16 October 2017
International Journal of Remote Sensing, doi: 10.1080/01431161.2017.1390271
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Article 4 Reads 0 Citations Shrub encroachment by green alder on subalpine pastures: Changes in mineral soil organic carbon characteristics Matthias Hunziker, Chatrina Caviezel, Nikolaus J. Kuhn Published: 01 October 2017
CATENA, doi: 10.1016/j.catena.2017.05.005
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Article 2 Reads 0 Citations The potential for gamma-emitting radionuclides to contribute to an understanding of erosion processes in South Africa Ian D. L. Foster, John Boardman, Adrian L. Collins, Ruth Cop... Published: 03 March 2017
Proceedings of the International Association of Hydrological Sciences, doi: 10.5194/piahs-375-29-2017
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Several research projects undertaken by the authors and others over the last 14 years have used fallout and geogenic radionuclides for understanding erosion processes and sediment yield dynamics in South Africa over the last 100–200 years as European settlers colonised the interior plains and plateaux of the country and imported new livestock and farming techniques to the region. These projects have used two fallout radionuclides (210Pb and 137Cs) to date sediments accumulating in reservoirs, farm dams, wetlands, alluvial fans and floodouts and have used other fallout nuclides (7Be) and long-lived geogenic radionuclides (e.g. 40K, 235U) as part of a composite fingerprint exploring contemporary sediment sources and changes to sources through time. While successful in many parts of the world, applying these techniques in Southern Africa has posed a number of challenges often not encountered elsewhere. Here we explore some of the benefits and challenges in using gamma-emitting radionuclides, especially 137Cs, in these landscapes. Benefits include the potential for discriminating gully sidewall from topsoil sources, which has helped to identify contemporary gully systems as sediment conduits, rather than sources, and for providing a time-synchronous marker horizon in a range of sedimentary environments that has helped to develop robust chronologies. Challenges include the spatial variability in soil cover on steep rocky hillslopes, which is likely to challenge assumptions about the uniformity of initial fallout nuclide distribution, the paucity of stable (non-eroding) sites in order to estimate atmospheric fallout inventories, and the limited success of 210Pb dating in some rapidly accumulating high altitude catchments where sediments often comprise significant amounts of sand and gravel. Despite these challenges we present evidence suggesting that the use of gamma-emitting radionuclides can make a significant contribution to our understanding of erosion processes and sediment yield dynamics. Future research highlighted in the conclusion will try to address current challenges and outline new projects established to address them more fully.
Article 2 Reads 8 Citations Temporal Variation of SOC Enrichment from Interrill Erosion over Prolonged Rainfall Simulations Yaxian Hu, Wolfgang Fister, Nikolaus Kuhn Published: 23 October 2013
Agriculture, doi: 10.3390/agriculture3040726
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Sediment generated by interrill erosion is commonly assumed to be enriched in soil organic carbon (SOC) compared to the source soil. However, the reported SOC enrichment ratios (ERSOC) vary widely. It is also noteworthy that most studies reported that the ERSOC is greater than unity, while conservation of mass dictates that the ERSOC of sediment must be balanced over time by a decline of SOC in the source area material. Although the effects of crusting on SOC erosion have been recognized, a systematic study on complete crust formation and interrill SOC erosion has not been conducted so far. The aim of this study was to analyze the effect of prolonged crust formation and its variability on the ERSOC of sediment. Two silty loams were simultaneously exposed to a rainfall simulation for 6 h. The ERSOC in sediment from both soils increased at first, peaked around the point when steady-state runoff was achieved and declined afterwards. The results show that crusting plays a crucial role in the ERSOC development over time and, in particular, that the conservation of mass applies to the ERSOC of sediment as a consequence of crusting. A “constant” ERSOC of sediment is therefore possibly biased, leading to an overestimation of SOC erosion. The results illustrate that the potential off-site effects of selective interrill erosion require considering the crusting effects on sediment properties in the specific context of the interaction between soil management, rainfall and erosion.
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