Abstract
Studies on the relationship between soil fertility and aboveground biomass in lowland tropical forests have yielded conflicting results, reporting positive, negative and no effect of soil nutrients on aboveground biomass. Here, we quantify the impact of soil variation on the stand structure of mature Bornean forest throughout a lowland watershed (8–196 m a.s.l.) with uniform climate and heterogeneous soils. Categorical and bivariate methods were used to quantify the effects of (1) parent material differing in nutrient content (alluvium > sedimentary > granite) and (2) 27 soil parameters on tree density, size distribution, basal area and aboveground biomass. Trees ≥10 cm (diameter at breast height, dbh) were enumerated in 30 (0.16 ha) plots (sample area = 4.8 ha). Six soil samples (0–20 cm) per plot were analyzed for physiochemical properties. Aboveground biomass was estimated using allometric equations. Across all plots, stem density averaged 521 ± 13 stems ha−1, basal area 39.6 ± 1.4 m2 ha−1 and aboveground biomass 518 ± 28 Mg ha−1 (mean ± SE). Adjusted forest-wide aboveground biomass to account for apparent overestimation of large tree density (based on 69 0.3-ha transects; sample area = 20.7 ha) was 430 ± 25 Mg ha−1. Stand structure did not vary significantly among substrates, but it did show a clear trend toward larger stature on nutrient-rich alluvium, with a higher density and larger maximum size of emergent trees. Across all plots, surface soil phosphorus (P), potassium, magnesium and percentage sand content were significantly related to stem density and/or aboveground biomass (R Pearson = 0.368–0.416). In multiple linear regression, extractable P and percentage sand combined explained 31% of the aboveground biomass variance. Regression analyses on size classes showed that the abundance of emergent trees >120 cm dbh was positively related to soil P and exchangeable bases, whereas trees 60–90 cm dbh were negatively related to these factors. Soil fertility thus had a significant effect on both total aboveground biomass and its distribution among size classes.
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Acknowledgments
We are grateful to the Indonesian Institute of Sciences (LIPI) and the Department of Forest Protection and Nature Conservation (PHKA) for granting permission to conduct research in Indonesia. The research presented in this paper complies with the current laws of both Indonesia and the USA. We thank the Center for Research in Biology (PPB), for sponsorship and logistical support, and the students and faculty of Universitas Tanjungpura, for participating as our research counterparts. We thank C. Cannon and M. Leighton for use of the Gunung Palung floristic dataset to estimate specific wood densities across substrates, and Farizal, Hon, Tang and Morni for vital assistance in the field. A. Budiman, Sugarjito, N. Paliama and M. Sinaga provided administrative support. Financial support for Gary D. Paoli from the Fulbright Indonesia Program and the University of Michigan; Lisa M. Curran from NASA Earth Science Program (NAG 511335 & 511161), the University of Michigan, the Yale School of Forestry and Environmental Studies and the Santa Fe Institute; and J. W. F. Slik from NWO-WOTRO (project grant nr.W84–573).
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Paoli, G.D., Curran, L.M. & Slik, J.W.F. Soil nutrients affect spatial patterns of aboveground biomass and emergent tree density in southwestern Borneo. Oecologia 155, 287–299 (2008). https://doi.org/10.1007/s00442-007-0906-9
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DOI: https://doi.org/10.1007/s00442-007-0906-9