Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Atmospheric deposition versus rock weathering in the control of streamwater chemistry in a tropical rain-forest catchment in Malaysian Borneo
AU - Yamashita, N.
AU - Sase, H.
AU - Kobayashi, R.
AU - Peng, Leong Kok
AU - Hanapi, Jamal Mohd
AU - Uchiyama, S.
AU - Urban, S.
AU - Ying-Ying, Toh
AU - Muhamad, Maznorizan
AU - Gidiman, Jikos
AU - Chappell, Nick A.
N1 - http://journals.cambridge.org/action/displayJournal?jid=TRO The final, definitive version of this article has been published in the Journal, Journal of Tropical Ecology 30 (5), pp 481-492 2014, © 2014 Cambridge University Press.
PY - 2014/9
Y1 - 2014/9
N2 - Uncertainty about the H+ buffering capacity in tropical rain forest limits our ability to predict the future effect of anthropogenic deposition on the streamwater chemistry. Export ofmajor ions to the stream and the ion-fluxes via rainfall, throughfall, litter-leachate and soil-water pathways were observed to examine the source of streamwater nutrients in a small catchment in Sabah, Malaysia. The streamwater and the ion-fluxes were measured for 3.75 and 2 y, respectively, by collecting water twice a month and setting ion-exchange-resin columns. Streamwater pH ranged from 6.5 to 7.6 and was not sensitive to water discharge controlling base cations. The NO3--N, Ca2+ and Mg2+ fluxes were low in atmospheric depositions (0.6, 0.5 and 0.3 kg ha−1 y−1, respectively) andmarkedly increased in litter layer. The NO3− flux decreased drastically from subsoil (70 kg ha−1 y−1) to the stream (1.4 kg ha−1 y−1) whereas the Ca2+ and Mg2+ fluxes were not different between subsoil (38 and 18 kg ha−1 y−1) and stream (30 and 15 kg ha−1 y−1). Neutral pH in tropical streams was mainly due to the base cation leaching with deep chemical weathering in deeper strata, and a rapid decrease in NO3− leaching from the subsoil to the stream.
AB - Uncertainty about the H+ buffering capacity in tropical rain forest limits our ability to predict the future effect of anthropogenic deposition on the streamwater chemistry. Export ofmajor ions to the stream and the ion-fluxes via rainfall, throughfall, litter-leachate and soil-water pathways were observed to examine the source of streamwater nutrients in a small catchment in Sabah, Malaysia. The streamwater and the ion-fluxes were measured for 3.75 and 2 y, respectively, by collecting water twice a month and setting ion-exchange-resin columns. Streamwater pH ranged from 6.5 to 7.6 and was not sensitive to water discharge controlling base cations. The NO3--N, Ca2+ and Mg2+ fluxes were low in atmospheric depositions (0.6, 0.5 and 0.3 kg ha−1 y−1, respectively) andmarkedly increased in litter layer. The NO3− flux decreased drastically from subsoil (70 kg ha−1 y−1) to the stream (1.4 kg ha−1 y−1) whereas the Ca2+ and Mg2+ fluxes were not different between subsoil (38 and 18 kg ha−1 y−1) and stream (30 and 15 kg ha−1 y−1). Neutral pH in tropical streams was mainly due to the base cation leaching with deep chemical weathering in deeper strata, and a rapid decrease in NO3− leaching from the subsoil to the stream.
KW - hydrology
KW - nutrient cycling
KW - precipitation
KW - South-east Asia
KW - tropical rain forest
KW - tropical streams
U2 - 10.1017/S0266467414000303
DO - 10.1017/S0266467414000303
M3 - Journal article
VL - 30
SP - 481
EP - 492
JO - Journal of Tropical Ecology
JF - Journal of Tropical Ecology
SN - 0266-4674
IS - 5
ER -