Sökning: "August Chen"

Hittade 2 uppsatser innehållade orden August Chen.

  1. 1. Forest fertilization does not cause any long-term effects on tree growth or vegetation composition

    Master-uppsats, SLU/Dept. of Ecology

    Författare :Yixian Chen; [2023]
    Nyckelord :density; ground vegetation; height; stem radial growth; legacy nitrogen effect; soil total N and C N ratio; tree;

    Sammanfattning : Forest fertilization is considered one of the most effective management options to improve forest productivity. In Fennoscandia, nitrogen (N) fertilization has been practiced for over 50 years and is normally added in the form of granules of NH4NO3 at least 15 years prior to the final harvest. LÄS MER

  3. 2. The Effect of Congestion Charge and Fuel Arbitrage on Air Quality in Stockholm

    D-uppsats, Handelshögskolan i Stockholm/Institutionen för finansiell ekonomi

    Författare :Yan Chen; [2013]
    Nyckelord :Air quality; Congestion charge; Green cars; Fuel sales; Stockholm;

    Sammanfattning : In August 2007, the congestion charge is launched in Stockholm after a seven-month trial period in 2006. This paper applies empirical methods to estimate the effects of the implementation of congestion charge on the air quality in Stockholm. I find that the trial and permanent congestion tax have reduced the emissions of major air pollutants. LÄS MER