Systemwide Events Calendar
NREM Seminar Series, Jeremy Albano
December 10, 12:00pm - 1:00pmManoa Campus, BioMed, T-208
Title: Spatial and temporal variability of soil respiration along a mean annual temperature gradient in Hawaiian wet forests
Jeremy Albano1
Mentors: Creighton M. Litton1, Christian P. Giardina2
Internship coordinators: Sharon Ziegler-Chong3, Noelani Puniwai3, Ulu Ching3
1 Department of Natural Resources and Environmental Management, University of Hawaii at Manoa, 1910 East-West Road, Honolulu, HI 96822, USA
2 USDA Forest Service, Institute of Pacific Islands Forestry, 60 Nowelo Street, Hilo, HI 96720, USA
3 Pacific Internship Programs for Exploring Science, University of Hawaii Hilo, 200 West Kawili Street, Hilo, HI 96720, USA
Internship period: June 1, 2009-August 5, 2009
ABSTRACT
Soil respiration is a significant flux in the global carbon cycle, representing a large component of the biogeochemical interactions among the pedosphere, biosphere, and atmosphere. In this study, instantaneous soil respiration, soil temperature, and soil moisture were measured in six forest plots along a 4°C mean annual temperature (MAT) gradient (13-17°C ) with constant substrate type and age, canopy vegetation, and plant available water. Spatial and temporal surveys were conducted with a portable CO2 efflux system to: (i) determine adequate sample size; and (ii) evaluate the importance of diel variability in estimating daily soil respiration rates from instantaneous measurements. Along the MAT gradient, previously established sample sizes (n = 8) were doubled (n = 16) at six sites, and 24-hr measurements were taken at three sites. The magnitude and spatial variation of soil respiration were significantly and positively related to soil temperature, being highest at the warmest MAT (5.18 and 2.17 mmol CO2 m-2 s-1, respectively). Analysis indicated that the original sample size sufficiently minimized error (~0.5 mmol CO2 m-2 s-1), and no significant differences were seen across all plots with 8 vs. 16 measurements (P = 0.09). However, larger sample sizes may be necessary to confidently account for spatial variability (56-63 collars plot-1 for a ± 10% confidence interval), particularly at warmer sites where temporal variability of both soil respiration (0.78 mmol CO2 m-2 s-1) and temperature (0.44°C) were also found to be highest.
Event Sponsor
NREM, Manoa Campus
More Information
Lois Agena, 808-956-7530, laagena@hawaii.edu
| Thursday, December 10 | |
| 8:00am | Fall Book BuyBack Kaua'i Campus, Kauai Community College Booktore |
| 8:30am | International Management Oral Manoa Campus, BusAd D-205 |
| 11:00am | E Malama i Kou Ola Kino Free Health Screenings Manoa Campus, Campus Center/Bachman Lawn |
| 12:00pm | NREM Seminar Series, Yudai Sumiyoshi Manoa Campus, BioMed, T-208 |
| 12:00pm | NREM Seminar Series, Darcey Iwashita Manoa Campus, BioMed, T-208 |
| 12:00pm | NREM Seminar Series, Jeremy Albano Manoa Campus, BioMed, T-208 |
| 12:30pm | Horticulture Society Poinsettia Sale! Manoa Campus, St. John, Room 10B |
| 2:00pm | Astronomy Final Oral Manoa Campus, Institute for Astronomy, Auditorium, C214 |
| 3:00pm | Oceanography Seminar Manoa Campus, MSB 100 |
| 3:30pm | Pacific Biosciences Research Center Seminar Kewalo Marine Laboratory Library, 41 Ahui Street |
| 5:00pm | High-Resolution Modeling of the Climate System Manoa Campus, Keoni Auditorium, Imin Conference Center, East-West Center |
| 6:00pm | Bruce & Ju-Chan Fulton on The Red Room Manoa Campus, Center for Korean Studies |
| 7:00pm | Creativity and Invention with Photography Manoa Campus, Krauss Hall 012, Yukiyoshi Room |
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