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Effect of stand composition and season on chemistry of throughfall and stemflow of ponderosa pine pinus ponderosa forests



Effect of stand composition and season on chemistry of throughfall and stemflow of ponderosa pine pinus ponderosa forests



Forest Science 29(4): 871-887



A 3-yr study was conducted in the Arizona [USA] ponderosa pine forest to determine the influence of several forest stand conditions on input and cycling of 7 major nutrients by precipitation, throughfall and stemflow. Timber stand conditions studied included dense 54-yr old saplings and small poles, large poles, and thinned large poles. Stand conditions significantly influenced both the concentration and amount of nutrients transferred in throughfall and stemflow. Total Kjeldahl N and NO3-N were absorbed from incident rainfall by sapling and small pole stands while throughfall of all stands gained in Ca, Mg and K. Gain of Ca and Mg in throughfall was greatest in large pole stands. Concentration of stemflow nutrients was greatest for large pole stands, but amount of stemflow nutrients was greatest in sapling and small pole stands. The pattern for amount of nutrients transferred was strongly seasonal with the largest amount delivered in midsummer, probably by leaching from leaves and bark. The seasonal pattern for concentration of nutrients was less regular than for amount of nutrients and more strongly affected by dry fallout.

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Accession: 005272270

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