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Showing result 1 - 5 of 6 essays matching the above criteria.

  1. 1. Long-term Nitrogen Deposition and Recovery of Epiphytic Lichens : Concealed memory and implications

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Camille Volle; [2022]
    Keywords : epiphytic lichens; N deposition; boreal forest; recovery; critical load;

    Abstract : Anthropogenic activities have increased nitrogen (N) emissions. However, higher N deposition is associated with negative fallouts in ecosystems, highlighting the necessity to define its critical load (CLO). Lichens, with their lack of roots, stomata, and cuticles, are helpful air pollution indicators and can be used to establish N CLO. READ MORE

  3. 2. Increasing forest mortality and its drivers: Simulating central European forests under climate change

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Marieke Scheel; [2021]
    Keywords : forest mortality; central Europe; competition; CO2; temperature; precipitation; DVM; LPJ-GUESS; simulation; reproducing data; Earth and Environmental Sciences;

    Abstract : Increasing tree growth and mortality rates in Europe are still poorly understood and have been attributed to a variety of drivers. This study aimed to relate increasing forest mortality rates in six central European countries to climate drivers (CO2 concentration, temperature and precipitation) from 1985-2015, using a process-based vegetation model. READ MORE

  4. 3. Long-term effects of nitrogen deposition on epiphytic lichens

    University essay from Institutionen för ekologi, miljö och geovetenskap

    Author : Marie Rönnqvist; [2013]
    Keywords : simulated nitrogen deposition; boreal forest; epiphytic lichens; cumulative loads;

    Abstract : The main aim of this study was to analyse the long-term effects on epiphytic lichen dry mass development, diversity and community structure after exposure to a simulated nitrogen deposition gradient. A whole tree experiment was set up in a boreal forest in the County of Västerbotten in Sweden, whereby 15 trees were artificially irrigated and nitrogen fertilized during seven consecutive years (2006-2012). READ MORE

  5. 4. Modeling study of Nitrous Oxide emission from one drained organic forest ecosystem.

    University essay from KTH/Mark- och vattenteknik

    Author : Hongxing He; [2012]
    Keywords : N2O emission; Peat soil; forest; CoupModel; GLUE;

    Abstract : High nitrous oxide (N2O) emission potential has been identified in hemiboreal forest on drained Histosols. However, the environmental factors regulating the emissions were unclear. READ MORE

  6. 5. Klibbalens gödslingseffekt på volymproduktionen i ett blandbestånd av gran och klibbal : en simulering i Heureka

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Therese Andersson; Ronja Jägbrant; [2012]
    Keywords : kväve; kvävefixering; blandskog; blandskogseffekt; Picea abies; Alnus glutinosa; StandWise; biologisk gödsling;

    Abstract : A secondary and a pioneer tree species can with advantage be included in a mixed stand to increase the use of sunlight. Nitrogen-fixing plants have been shown to increase the supply of nitrogen in the soil by, for example, litter fall. This deposition acts as a biological fertilization, which may be used by non-fixing plants. READ MORE