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Tree Species Effects on Soil Properties in Experimental Plantations in Tropical Moist Forest

^a Dep. of Natural Resource Ecology and Management, Iowa State Univ., Ames, IA 50011
^b Dep. of Ecology, Evolution and Organismal Biology, Iowa State Univ., Ames, IA 50011
^c Texas A&M Univ., College Station, TX 77843

View larger version (59K): [in this window] [in a new window]   Fig. 1. Soil organic carbon (SOC) stocks in Year 15 in experimental plantations on abandoned pasture at La Selva Biological Station, Costa Rica. Data are for the 0- to 15-cm depth. Hyal = Hyeronima alchorneoides; Pema = Pentaclethra macroloba; Pipa = Pinus patula ssp. tecunumanii; Viko = Virola koschnyi; Vofe = Vochysia ferruginea; and Vogu = Vochysia guatemalensis. Dashed line indicates baseline SOC. Abandoned pasture and mature forest reference sites were not included in the ANOVA. Error bars are standard errors.

View larger version (26K): [in this window] [in a new window]   Fig. 2. Soil organic C and total forest floor litter mass under six tropical tree species at La Selva Biological Station, Costa Rica. Soils data are for the 0- to 15-cm depth. Symbols: • = Hyeronima alchorneoides, = Pentaclethra macroloba, = Pinus patula, = Virola koschnyi, and = Vochysia guatemalensis.

View larger version (45K): [in this window] [in a new window]   Fig. 3. Potential C mineralization in experimental plantations at La Selva Biological Station, Costa Rica, determined as CO2–C released during laboratory incubations of soil from 15-yr-old plantations and abandoned pasture and mature forest reference sites. Data are for the 0–15 cm depth. Hyal = Hyeronima alchorneoides; Pema = Pentaclethra macroloba; Pipa = Pinus patula ssp. tecunumanii; Viko = Virola koschnyi; Vofe = Vochysia ferruginea; and Vogu = Vochysia guatemalensis. Reference sites were not included in the ANOVA. Error bars are standard errors.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Soil organic C as a function of fine-root ingrowth and non-woody litterfall in experimental plantations at La Selva Biological Station, Costa Rica. Symbols: • = Hyeronima alchorneoides, = Pentaclethra macroloba, = Pinus patula, = Virola koschnyi, and = Vochysia guatemalensis.

View larger version (51K): [in this window] [in a new window]   Fig. 5. Relationships between soil organic C, potential C mineralization (as CO2–C released), fine root lignin, and fine-root Al in experimental plantations at La Selva Biological Station, Costa Rica. Symbols: • = Hyeronima alchorneoides, = Pentaclethra macroloba, = Pinus patula, = Virola koschnyi, and = Vochysia guatemalensis.