Sammanfattning

Restoration of acidified lakes by liming does not, in many cases, improve productivity to a pre-acidified state. We hypothesize that the poor recovery detected in many of these lakes is due to constrained in-lake phosphorous (P) cycling caused by enhanced precipitation of metals in higher pH, limed waters. Long-term (1990-2012) data for 65 limed, circum-neutral (pH 6-8), and acidified lakes in Sweden were analyzed to determine trends for P and potential drivers of these trends. Limed lakes not only had lower mean values and stronger decreasing trends for total P than non-limed lakes, but they also had the highest percentage of decreasing trends (85 %). A P release factor (Hypolimnetic P/Epilimnetic P) was developed to elucidate differences in internal P cycling between lake groups. Consistently, lower P release factors in limed lakes show limitation of internal P cycling during summer months that may be a factor limiting P bioavailability and thus productivity of these systems.

Nyckelord

Productivity; Liming; Sediment; Phosphorus; Metal precipitation; Acidified lakes

Publicerad i

AMBIO: A Journal of the Human Environment
2014, Volym: 43, nummer: SI, Supplement 1, sidor: 104-112
Utgivare: SPRINGER

SLU författare

• Huser, Brian

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Globala målen

Säkerställa tillgången till och en hållbar förvaltning av vatten och sanitet för alla


UKÄ forskningsämne

Geokemi
Oceanografi, hydrologi, vattenresurser


Publikationens identifierare

DOI: https://doi.org/10.1007/s13280-014-0573-0

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/64057