Abstract
Key message
Large variations in leaf δ 15 N in Bornean tropical rainforest trees may indicate that various tropical species have species-specific strategy for nitrogen uptake under low soil nutrient conditions, including root symbiotic microorganisms such as ectomycorrhiza.
Abstract
Lowland tropical rainforests in Southeast Asia are characterized by high species diversity despite limited soil nutrient conditions. The plant nitrogen isotope ratio (δ15N) reflects plant uptake of soil nitrogen. We analyzed δ15N values and nitrogen content (N %) in leaves and roots of 108 woody species with different types of symbiotic microorganisms, of different life forms (emergent, canopy, sub-canopy, understory, and canopy gap species), and from different families in a Bornean lowland dipterocarp forest to gain more insight into the diversity of nitrogen uptake strategy in the rhizosphere. Leaf δ15N values in the species studied varied largely from −7.2 to 5.0 ‰, which is comparable to the values of known Asian trees including temperate, sub-tropical, and tropical mountain forests. Leaf δ15N also varied significantly among both life forms and families, though the phylogenetically independent contrast (PIC) relationships were not statistically significant among life form, family, and symbiotic types. Some families showed specific leaf δ15N values; Dipterocarpaceae, the dominant family in the canopy layer with symbiotic ectomycorrhiza in Southeast Asia, had small intraspecific variation and higher leaf δ15N values (0.03 ‰) compared with species exhibiting arbuscular mycorrhiza, whereas several families such as Burseraceae, Euphorbiaceae, and Myrtaceae showed large interspecific variation in leaf δ15N (e.g., from −7.2 to 5.0 ‰ in Euphorbiaceae). These variations suggest that tropical species may have family- or species-specific strategy, such as root symbiotic microorganisms, for nitrogen uptake under low-nutrient conditions in tropical rainforests in Southeast Asia.
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Acknowledgments
We are grateful to the Forest Department, Sarawak, and to Prof. T. Nakashizuka for their kind support of this study. We are grateful to the Dr. M. Yamamuro, Dr. Y. Tabayashi and the Department of Forest Site Environment in FFPRI. We acknowledge the support of Western Ag Innovations Inc., Canada for this study. This work was partly supported by JSPS KAKENHI Grants (No. 24405032, No. 24688017, No. 2410102, No. 26252020), by the Environment Research and Technology Development Fund (RF-1010, S-9) of the Ministry of the Environment, Japan, and by Japan Society for Promotion of Science (JSPS) Research Fellowships for Young Scientists to A. T-O.
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Communicated by T. Koike and K. Noguchi.
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Tanaka-Oda, A., Kenzo, T., Inoue, Y. et al. Variation in leaf and soil δ15N in diverse tree species in a lowland dipterocarp rainforest, Malaysia. Trees 30, 509–522 (2016). https://doi.org/10.1007/s00468-015-1298-9
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DOI: https://doi.org/10.1007/s00468-015-1298-9