Hubbard Brook Experimental Forest, NH Herbert Bormann Gene Likens - PDF document

Mar 06, 2023 •115 likes •180 views

Hubbard Brook Experimental Forest, NH Herbert Bormann Gene Likens Robert Pierce (and others) Why would ecologists clear-cut a forest? Watershed #2 was clearcut in the winter of 1965-66 Herbicide applied in June 1966 to keep regrowth down CUT

Hubbard Brook Experimental Forest, NH Herbert Bormann Gene Likens Robert Pierce (and others) Why would ecologists clear-cut a forest? Watershed #2 was clearcut in the winter of 1965-66 Herbicide applied in June 1966 to keep regrowth down CUT Does clearcutting change hydrology? pH dropped slightly and water temperature increased a little
Hubbard Brook Nutrient Cycling Concentration in Stream Water (mg/l) scale change 47 - 56 fold change CUT (4600 - 5500% increase) NO 3 - SO 4 2- 1966 1967 1968 Release of soil cations increased Ca 2+ CUT 417% Mostly organic (humic) sources Mg 2+ 408% K + 1558% 177% Na + Mostly mineral Al 3+ sources > 1000%
INCREASED Nutrient retention in the system was impaired What are the main organisms and processes in the intrasystem cycle?
Energy Biotic storage Autochthonous Allochthonous Nutrient regeneration inputs export Abiotic storage Old-field succession time
Hubbard Brook Plant pool Stream fluxes Soil changes during succession
Old-field succession fates of NPP time brown web green web

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