2024-03-28T17:59:32Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00040508
2022-04-27T09:10:53Z
160:5737
3:62:5602:5720
Soil nutrients and size-dependent tree dynamics of tropical lowland forests on volcanic and sedimentary substrates in Sabah, Malaysian Borneo
清野, 達之
Aoyagi, Ryota
Imai, Nobuo
Seino, Tatsuyuki
Kitayama, Kanehiro
© 2016 The Japan Society of Tropical Ecology
Soil nutrient concentrations and tree dynamics were examined in two Bornean tropical forests on contrasting geological substrates, one on volcanic and the other on sedimentary rocks. Concentrations of P extracted by the Hadley fractionation method and inorganic N of topsoils were much greater in the volcanic site than in the sedimentary site. Dipterocarps showed greater relative growth rates in the volcanic site than in the sedimentary site at the smallest size class (10cm ≤ diameter at breast height<20cm), but not at larger size classes. Dipterocarps in the two sites demonstrated the same values of crown position index (a surrogate of light conditions), implying that the greater tree growth in the volcanic site was associated with the greater soil nutrient availability, but not with light availability. On the other hand, relative growth rates of non-dipterocarps did not differ between the sites at all size classes despite the considerable differences in the soil nutrient concentrations, suggesting that factors other than N and P availabilities limit the growth of these trees. Contrary to growth rate, annual mortality rate was greater in the volcanic site at all size classes for all phylogenetic groups. Our results suggest that the volcanic site is characterized as high soil nutrient availability and a greater tree turnover, and that tree size is an important factor that differentiates tree growth between the two tropical forests with contrasting nutrient availabilities.
the Japan Society of Tropical Ecology
2016-09
eng
journal article
http://hdl.handle.net/2241/00145462
https://tsukuba.repo.nii.ac.jp/records/40508
10.3759/tropics.MS15-13
0917-415X
AN10528811
Tropics
25
2
43
52
https://tsukuba.repo.nii.ac.jp/record/40508/files/TP_25-2-43.pdf
application/pdf
880.0 kB
2017-03-06