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Berlin Brandenburg

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  • 1
    Language: English
    In: Environmental pollution (Barking, Essex : 1987), September 2006, Vol.143(1), pp.178-85
    Description: The role of detrital quantity and quality in forest floor N leaching was investigated in a litter manipulation experiment at a deciduous forest under chronic N deposition. Dissolved inorganic nitrogen (DIN) comprised the bulk of nitrogen leaching from the control except a short period following autumn litterfall. The dominance of DIN was strengthened by litter exclusion, whereas the addition of glucose or fresh litter led to a small increase in dissolved organic nitrogen (DON) and either a temporary or gradual reduction in NO(3)(-) release, respectively. Changes in soluble organic C and microbial C in the forest floor implied that increased availability of C sources might have enhanced microbial immobilization of DIN, either temporarily following glucose application or over the longer term following litter addition. The results suggest that detrital quantity and quality can play a crucial role in determining the balance between DIN and DON in N-enriched forest soils.
    Keywords: Air Pollutants ; Biodegradation, Environmental ; Ecosystem ; Nitrogen ; Plant Leaves ; Trees
    ISSN: 0269-7491
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  • 2
    Language: English
    In: Environmental Pollution, 2007, Vol.149(2), pp.201-208
    Description: To identify the role of the forest floor in arsenic (As) biogeochemistry, concentrations and fluxes of inorganic and organic As in throughfall, litterfall and forest floor percolates at different layers were investigated. Nearly 40% of total As input (5.3 g As ha yr ) was retained in Oi layer, whereas As fluxes from Oe and Oa layers exceeded the input by far (10.8 and 20 g As ha yr , respectively). Except dimethylarsinic acid (DMA), fluxes of organic As decreased with depth of forest floor so that 〈10% of total deposition (all 〈0.3 g As ha yr ) reached the mineral soil. All forest floor layers are sinks for most organic As. Conversely, Oe and Oa layers are sources of As , arsenite, arsenate and DMA. Significant correlations ( ≥ 0.43) between fluxes of As , arsenite, arsenate or DMA and water indicate hydrological conditions and adsorption–desorption as factors influencing their release from the forest floor. The higher net release of arsenite from Oe and Oa and of DMA from Oa layer in the growing than dormant season also suggests microbial influences on the release of arsenite and DMA. The forest floor layers are generally a source for inorganic arsenic species but a sink for most organic arsenic species under the present deposition rate.
    Keywords: Arsenic Speciation ; Throughfall ; Litterfall ; Forest Floor Percolate ; Engineering ; Environmental Sciences ; Anatomy & Physiology
    ISSN: 0269-7491
    E-ISSN: 1873-6424
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  • 3
    Language: English
    In: Environmental Pollution, 2006, Vol.143(1), pp.178-185
    Description: The role of detrital quantity and quality in forest floor N leaching was investigated in a litter manipulation experiment at a deciduous forest under chronic N deposition. Dissolved inorganic nitrogen (DIN) comprised the bulk of nitrogen leaching from the control except a short period following autumn litterfall. The dominance of DIN was strengthened by litter exclusion, whereas the addition of glucose or fresh litter led to a small increase in dissolved organic nitrogen (DON) and either a temporary or gradual reduction in NO release, respectively. Changes in soluble organic C and microbial C in the forest floor implied that increased availability of C sources might have enhanced microbial immobilization of DIN, either temporarily following glucose application or over the longer term following litter addition. The results suggest that detrital quantity and quality can play a crucial role in determining the balance between DIN and DON in N-enriched forest soils. Detrital quantity and quality play a crucial role in regulating the release of DON and DIN from the forest floor under chronic N deposition.
    Keywords: C Limitation ; Dissolved Inorganic Nitrogen ; Dissolved Organic Nitrogen ; Forest Floor ; N Saturation ; Engineering ; Environmental Sciences ; Anatomy & Physiology
    ISSN: 0269-7491
    E-ISSN: 1873-6424
    Source: ScienceDirect Journals (Elsevier)
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  • 4
    Language: English
    In: Environmental Pollution, 2004, Vol.130(2), pp.177-186
    Description: Organotin compounds (OTC) are highly toxic pollutants and have been mostly investigated so far in aquatic systems and sediments. The concentrations and fluxes of different organotin compounds, including methyl-, butyl-, and octyltin species in precipitation and fog were investigated in a forested catchment in NE Bavaria, Germany. Contents, along with the vertical distribution and storages in two upland and two wetland soils were determined. During the 1-year monitoring, the OTC concentrations in bulk deposition, throughfall and fog ranged from 1 ng Sn l −1 to several ten ng Sn l −1 , but never over 200 ng Sn l −1 . The OTC concentrations in fog were generally higher than in throughfall and bulk deposition. Mono-substituted species were the dominant Sn species in precipitation (up to 190 ng Sn l −1 ) equaling a flux of up to 70 mg Sn ha −1 a −1 . In upland soils, OTC contents peaked in the forest floor (up to 30 ng Sn g −1 ) and decreased sharply with the depth. In wetland soils, OTC had slightly higher contents in the upper horizons. The dominance of mono-substituted species in precipitation is well reflected in the contents and storages of OTC in both upland and wetland soils. The ratios of OTC soil storages to the annual throughfall flux ranged from 20 to 600 years. These high ratios are probably due to high stability and low mobility of OTC in soils. No evidence was found for methylation of tin in the wetland soils. In comparison with sediments, concentrations and contents of organotin in forest soils are considerably lower, and the dominant species are less toxic. It is concluded that forested soils may act as sinks for OTC deposited from the atmosphere. Forested soils may act as sinks for atmospherically deposited organotin compounds.
    Keywords: Organotin Compounds ; Upland and Wetland Soils ; Precipitation ; Fog ; Forested Ecosystem ; Engineering ; Environmental Sciences ; Anatomy & Physiology
    ISSN: 0269-7491
    E-ISSN: 1873-6424
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