Organic matter and nutrient dynamics of the forest and forest floor in the Hubbard Brook forest.

摘要: The forest floor is a major reservoir of organic matter and nutrients for the ecosystem as such it influences or regulates most functional processes occurring throughout ecosystem. This study reports on nutrient content Hubbard Brook Experimental Forest during different seasons attempts to correlate results from studies vegetation, litter, decomposition, stemflow, throughfall, soil. An budget presented an undisturbed watershed. Average weight watershed ranged 25,500 85,500 kg/ha. weighted average was 46,800 Although F H horizons did not vary significantly with time, L horizon increased period June August largely result severe hail storm. order abundance elements in Nτ;Ca≷Fe>S>P>Mn>K>Mg>Na>Zn>Cu. concentrations Ca, K, Mn decreased depth while N, P, S, Na, Fe, Zn, Cu increased. N:P ratios were similar decomposing leaf tissue, floor, litterfall, net stemflow plus throughfall suggesting pattern cycling. S proportional N P litterfall. Net affected by relatively large input SO4=-S atmosphere. Residence times inputs other than litterfall (precipitation, throughfall). Calculation residence using all caused smaller values if alone used. While reduced, differences occurred Na. showed long retranslocation immobilization decomposers. slow turnover rate because strong demand retention biota must account efficiency intrasystem cycling process P. K shortest time. A rapid efficient uptake vegetation seems this element. patterns are several depending chemical properties nutritional requirements biota.