caa a22 4500 477112285 CHVBK 20180405111612.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02185571 doi (NATIONALLICENCE)springer-10.1007/BF02185571 Temporal patterns of soil nutrients in a Panamanian moist forest revealed by ion-exchange resin and experimental irrigation [Elektronische Daten] [Joseph Yavitt, S. Wright] The effect of seasonal water availability on soil nutrients and soil N transformations was investigated by irrigating two large plots of mature tropical forest on Barro Colorado Island (BCI), Panama, during the dry season for five consecutive years. Methods included (i) nutrient accumulation by ion-exchange resins placed on the surface of the mineral soil for contiguous 21-day periods, (ii) monthly mineral soil (0-10 cm) extractions and incubations for inorganic N and P concentrations, and (iii) leaching loss of nutrients from leaf litter samples. Rates of nutrient accumulation by the resins showed a great deal of variation between sampling dates and among years in control plots; albeit, seasonal patterns were slight, except for the highest Ca values near the end of the wet season and inorganic P (Pi) and SO4 values that peaked during the dry season. Irrigation had remarkably little effect on nutrient accumulation rates by resins, except for an increase in Mg and Na values, but did affect the timing in the temporal variation in K, Na, Ni and Pi values. In contrast, inorganic N (Ni) and Pi pools and N transformation rates in the mineral soil hardly varied among sampling dates and did not show any response to irrigation. We hypothesize that the timing of leaf litterfall and nutrient leaching from forest floor litter can set up temporal patterns in the levels of soil nutrient at the surface of the mineral soil, but the temporal patterns essentially disappear with depth in the mineral soil. Kluwer Academic Publishers, 1996 Barro Colorado Island nationallicence base cations nationallicence nitrogen nationallicence phosphorus nationallicence seasonal variation nationallicence semideciduous forest nationallicence soil nationallicence Yavitt Joseph Department of Natural Resources, Fernow Hall, Cornell University, 14853, Ithaca, NY, USA aut Wright S. Department of Natural Resources, Fernow Hall, Cornell University, 14853, Ithaca, NY, USA aut Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl 183/1(1996-06-01), 117-129 0032-079X 183:1<117 1996 183 11104 https://doi.org/10.1007/BF02185571 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02185571 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yavitt Joseph Department of Natural Resources, Fernow Hall, Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Wright S. Department of Natural Resources, Fernow Hall, Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 773 0- Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl/ 183/1(1996-06-01), 117-129 0032-079X 183:1<117 1996 183 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer