Impact of Sewage Sludge Application on the Long-Term Nutrient Balance in Acid Soils of Scots Pine (Pinus Sylvestris, L.) Forests

摘要: The objective of the investigation was to determine effects sewage sludge application on nutrient concentrations in soil and plant biomass fractions Scots pine forests (Pinus sylvestris, L.), situated sandy soils with low pH, a south north temperature gradient Sweden. Twenty tons dw ha(-)1 applied 50 60 yr old at four sites from Brosarp South Sweden Jukkasjarvi northern parts country. Application 20 ton ha(-1) significantly increased extractable N, P, K, Ca, Mg Na, both mor layer upper 10 cm mineral soil. Three years after K were only After 11 P still same level as three years. Na had slightly decreased layer. There was, most cases, statistically significant positive correlation between amount soil, well needles leaves Vaccinium vitis-idaea. In all sites, positively correlated current-year needles. Similarly, Mg, these elements shorts