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  • 1
    Language: English
    In: European Journal of Forest Research, 2011, Vol.130(5), pp.695-706
    Description: The aim of this study was to investigate transpiration and its main driving factors on the example of a hybrid poplar plantation with the clone Populus maximowiczii × P. nigra , cv. Max 1 on a site in the hilly loess region of Saxony (Germany). Transpiration was measured using sap flow techniques during the 2007 and 2008 growing season. At the same time, throughfall, soil moisture dynamics and soil physical properties were also measured. Total transpiration rates amounted to 486 mm and 463 mm, respectively, during the 2 years. Maximum daily transpiration rates reached 6.7 mm/day, while an average of 2.2 mm/day for the entire growing season was recorded. The main controlling factors for stand transpiration included the evaporative demand, water availability and soil temperature. The information was implemented into a simple empirical model for the prediction of transpiration. It can be concluded that large-scale establishment of poplar plantations will result in a distinct reduction in groundwater recharge. On the other hand, surface run-off and soil erosion may decrease. Due to limited water availability in the late growing season, the growth potential of the tested clone cannot fully be exploited at many sites in Germany.
    Keywords: Evapotranspiration ; Soil water ; Poplar ; Plantation ; Sap flow
    ISSN: 1612-4669
    E-ISSN: 1612-4677
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  • 2
    Language: English
    In: European Journal of Forest Research, 11/2004, Vol.123(3), pp.177-188
    Description: Litter decomposition was studied for 2 years in a mixed forest serving as a water protection area (Rhine-Neckar conurbation, SW Germany). Two experiments differing in initial dry weight equivalent in litterbags were set up: one to compare decomposition of European beech leaves ( Fagus sylvatica ) with common oak leaves ( Quercus robur ), and the other comparing decomposition of Scots pine needles ( Pinus sylvestris ) with black cherry leaves ( Prunus serotina Ehrh.), respectively. Mass losses were greater for oak litter than for beech (75.0 versus 34.6%), and for cherry litter than for pine (94.6 versus 68.3%). In both experiments, a strong initial loss of soluble compounds occurred. The changes in litter N and P concentrations and the decrease in C-to-N ratio coincided with changes in residual mass. However, neither tannin and phenolic concentrations nor NMR could explain the pronounced variation in mass loss after 2 years. Differences in litter palatability and toughness, nutrient contents and other organic compounds may be responsible for the considerable differences in residual mass between litter types. The fast decay of black cherry leaves appears to play a major role in the present humus dynamics at the studied site. Since black cherry has a high N demand, which is mainly met by root uptake from the forest floor, this species is crucial for internal N cycling at this conurbation forest site. These effects together may significantly contribute to prevent nitrate leaching from the forest ecosystem which is subject to a continuous N deposition on an elevated level.
    Keywords: Litter quality ; C CPMAS NMR spectroscopy ; Nutrient cycling ; Nitrogen retention;
    ISSN: 1612-4669
    E-ISSN: 1612-4677
    Source: Springer (via CrossRef)
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  • 3
    Language: English
    In: European Journal of Forest Research, 2004, Vol.123(3), pp.177-188
    Description: Litter decomposition was studied for 2 years in a mixed forest serving as a water protection area (Rhine-Neckar conurbation, SW Germany). Two experiments differing in initial dry weight equivalent in litterbags were set up: one to compare decomposition of European beech leaves ( Fagus sylvatica ) with common oak leaves ( Quercus robur ), and the other comparing decomposition of Scots pine needles ( Pinus sylvestris ) with black cherry leaves ( Prunus serotina Ehrh.), respectively. Mass losses were greater for oak litter than for beech (75.0 versus 34.6%), and for cherry litter than for pine (94.6 versus 68.3%). In both experiments, a strong initial loss of soluble compounds occurred. The changes in litter N and P concentrations and the decrease in C-to-N ratio coincided with changes in residual mass. However, neither tannin and phenolic concentrations nor NMR could explain the pronounced variation in mass loss after 2 years. Differences in litter palatability and toughness, nutrient contents and other organic compounds may be responsible for the considerable differences in residual mass between litter types. The fast decay of black cherry leaves appears to play a major role in the present humus dynamics at the studied site. Since black cherry has a high N demand, which is mainly met by root uptake from the forest floor, this species is crucial for internal N cycling at this conurbation forest site. These effects together may significantly contribute to prevent nitrate leaching from the forest ecosystem which is subject to a continuous N deposition on an elevated level.
    Keywords: Litter quality ; C CPMAS NMR spectroscopy ; Nutrient cycling ; Nitrogen retention
    ISSN: 1612-4669
    E-ISSN: 1612-4677
    Source: Springer Science & Business Media B.V.
    Library Location Call Number Volume/Issue/Year Availability
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