TROPICAL TREE PLANTATION ROTATION EFFECTS ON FERTILITY, EARTHWORM ABUNDANCE, AND BIOMASS OF A HYDRUDAND SOIL IN HAWAI`I

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dc.contributor.advisorMathews, Bruce W.
dc.contributor.authorShimabukuro, Amy
dc.contributor.departmentTropical Conservation Biology & Environmental Science
dc.date.accessioned2018-07-09T21:04:05Z
dc.date.available2018-07-09T21:04:05Z
dc.date.issued2018-05
dc.description.abstractThis study examined how second-rotation tree species affected: (1) soil fertility and soil organic C for the 0- to 15- and 15- to 30-cm depths of an Akaka silty clay loam (Acrudoxic Hydrudand) three and six years into the second rotation that followed an 18-year first rotation and, (2) earthworm abundance, and biomass. Four first-second rotation species pairings were used: Sydney blue gum [SBG, Eucalyptus saligna)] to SBG, albizia [ALB, Falcataria moluccana] to ALB, SBG to ALB and ALB to SBG. Rotation affected soil pH at the 0- to 15-cm depth and were primarily attributed to the legacy effects with lower pH for rotations first planted to ALB than SBG. The SBG→ALB rotation consistently had greater exchangeable Ca and Mg than the other rotations at both soil depths. By year six there was: (1) greater soil organic C concentration and organic C gain since the first rotation at the 0- to 15-cm depth for ALB→ALB than SBG→SBG but ALB→ALB did not differ from SBG→ALB or ALB→SBG, (2) soil total N buildup from N2-fixation by ALB in SBG→ALB and total N decline for SBG→SBG, and (3) no difference in soil total N difference between ALB→SBG and SBG→ALB or between ALB→ALB and SBG→ALB. We found that both Amynthas gracilis and Pontoscolex corethrurus earthworms had greater densities and biomass in the treatment ALB→ALB than in the other treatments and were both positively correlated with soil N.
dc.description.degreeM.S.
dc.description.institutionUniversity of Hawaii at Hilo
dc.format.extent43 pages
dc.identifier.urihttp://hdl.handle.net/10790/3505
dc.language.isoen
dc.subjectAgriculture
dc.subjectConservation biology
dc.subjectForestry
dc.subjectAlbizia
dc.subjectearthworm
dc.subjectEucalyptus
dc.subjectsoil fertility
dc.subjecttree plantation
dc.titleTROPICAL TREE PLANTATION ROTATION EFFECTS ON FERTILITY, EARTHWORM ABUNDANCE, AND BIOMASS OF A HYDRUDAND SOIL IN HAWAI`I
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local.identifier.alturihttp://dissertations.umi.com/hilo.hawaii:10152

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