ISSN:
1573-2932
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract Year-to-year variation in acidic deposition within a mature sugar maple-dominated forest and in leaching of ions from the associated podzolic soil were examined at the Turkey Lakes Watershed between 1981 and 1986. Below-canopy inputs to the soil of SO4 2− and NO3 − in throughfall averaged 640 and 295 eq. ha−1 yr−1; the corresponding ranges were 493–917 and 261–443 eq. ha−1 yr−1. The contribution of atmospheric deposition to SO4 2− NO3 − and Ca2+ leaching decreased over the six years. During the study period, the mean annual volume-weighted NO3 − concentration decreased in throughfall and forest-floor percolate and increased in the mineral-soil solution collected below the effective rooting zone. A substantial shift in the balance between SO4 2− and NO3 −leaching from the mineral soil was observed; leaching of SO4 2−decreased and NO3 − leaching increased with time. Leaching of Ca2+ and Mg2+ from the soil was increased as a result of excess NO3 − production in the soil. The calculated output of NO3 − from the soil, which averaged 1505 eq. ha−1 yr−1, considerably exceeded the atmospheric deposition of NO3 −, whereas SO4 2− outputs were only moderately greater than inputs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00282382
