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Open AccessArticle

Estimating Fine Root Production from Ingrowth Cores and Decomposed Roots in a Bornean Tropical Rainforest

1
Kyushu University Forest, Kyushu University, Fukuoka 8112415, Japan
2
Tropical Peat Research Institute, Biological Research Division, Malaysian Palm Oil Board, Selangor 43000, Malaysia
3
Faculty of Science, Shinshu University, Matsumoto 3908621, Japan
4
School of Forestry and Resource Conservation, National Taiwan University, Taipei 10617, Taiwan
5
Faculty of Agriculture, University of the Ryukyus, Okinawa 9030129, Japan
6
School of Human Science and Environment, University of Hyogo, Himeji 6700092, Japan
*
Author to whom correspondence should be addressed.
Forests 2019, 10(1), 36; https://doi.org/10.3390/f10010036
Received: 9 November 2018 / Revised: 26 December 2018 / Accepted: 29 December 2018 / Published: 7 January 2019
(This article belongs to the Special Issue Rhizosphere Dynamics under Global Change)
Research highlights: Estimates of fine root production using ingrowth cores are strongly influenced by decomposed roots in the cores during the incubation period and should be accounted for when calculating fine root production (FRP). Background and Objectives: The ingrowth core method is often used to estimate fine root production; however, decomposed roots are often overlooked in estimates of FRP. Uncertainty remains on how long ingrowth cores should be installed and how FRP should be calculated in tropical forests. Here, we aimed to estimate FRP by taking decomposed fine roots into consideration. Specifically, we compared FRP estimates at different sampling intervals and using different calculation methods in a tropical rainforest in Borneo. Materials and Methods: Ingrowth cores were installed with root litter bags and collected after 3, 6, 12 and 24 months. FRP was estimated based on (1) the difference in biomass at different sampling times (differential method) and (2) sampled biomass at just one sampling time (simple method). Results: Using the differential method, FRP was estimated at 447.4 ± 67.4 g m−2 year−1 after 12 months, with decomposed fine roots accounting for 25% of FRP. Using the simple method, FRP was slightly higher than that in the differential method after 12 months (516.3 ± 45.0 g m−2 year−1). FRP estimates for both calculation methods using data obtained in the first half of the year were much higher than those using data after 12-months of installation, because of the rapid increase in fine root biomass and necromass after installation. Conclusions: Therefore, FRP estimates vary with the timing of sampling, calculation method and presence of decomposed roots. Overall, the ratio of net primary production (NPP) of fine roots to total NPP in this study was higher than that previously reported in the Neotropics, indicating high belowground carbon allocation in this forest. View Full-Text
Keywords: biomass; calculation method; necromass; NPP; production; sampling interval biomass; calculation method; necromass; NPP; production; sampling interval
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MDPI and ACS Style

Katayama, A.; Kho, L.K.; Makita, N.; Kume, T.; Matsumoto, K.; Ohashi, M. Estimating Fine Root Production from Ingrowth Cores and Decomposed Roots in a Bornean Tropical Rainforest. Forests 2019, 10, 36.

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