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

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Title:TROPICAL TREE PLANTATION ROTATION EFFECTS ON FERTILITY, EARTHWORM ABUNDANCE, AND BIOMASS OF A HYDRUDAND SOIL IN HAWAI`I
Authors:Shimabukuro, Amy
Contributors:Mathews, Bruce W. (advisor)
Tropical Conservation Biology & Environmental Science (department)
Keywords:Agriculture
Conservation biology
Forestry
Albizia
earthworm
show 3 moreEucalyptus
soil fertility
tree plantation
show less
Date Issued:May 2018
Abstract:This 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.
Pages/Duration:43 pages
URI:http://hdl.handle.net/10790/3505
Rights:All UHH dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: Tropical Conservation Biology and Environmental Science
TCBES Theses


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