Sources and Generation Mechanisms of High SO4 sup(2-) Concentrations in Soil water, Groundwater and Streamwater in a Small Watershed, Lambir Hills National Park, Malaysia

JASI HANDLE Web Site Web Site

Bibliographic Information

Other Title
  • マレーシア・ランビル国立公園小流域における土壌水,地下水,渓流水の高濃度硫酸の起源と生成機構
  • Sources and Generation Mechanisms of High SO4(2-) Concentrations in Soil water, Groundwater and Streamwater in a Small Watershed, Lambir Hills National Park, Malaysia
  • Sources and Generation Mechanisms of High SO₄²⁻ Concentrations in Soil water, Groundwater and Streamwater in a Small Watershed, Lambir Hills National Park, Malaysia

Search this article

Abstract

To understand the origin of the high SO4 sup(2-) concentrations in soil water, groundwater, and streamwater in undisturbed natural lowland rain forests and the link between such high SO4 sup(2-) concentrations and Al and Fe leaching, we undertook a case study in nested experimental watersheds covered by undisturbed tropical lowland rain forests in Lambir Hills National Park, Sarawak, Malaysia. Streamwater at the outlet of a 22 ha watershed was sampled weekly for 2 years and an intensive study of soil water, groundwater, and streamwater was conducted within a 0.59 ha sub-catchment. It was found that that (1) the spatial variation of SO4 sup(2-) concentration in streamwater was larger than the temporal variation, (2) the soil water SO4 sup(2-) concentrations in the Sandy Humult Ultisols distributed on the ridges and in the headwater areas in the sub-watershed were two orders of magnitude greater than in the Clay Udult Ultisols distributed on the lower slopes of the sub-watershed. Al leaching began when soil water pH dropped below 4.8 and Ca2+ concentration levels fell below approximately 20 micro molcL sup(-1). Fe leaching started when the SO4 sup(2-) concentration reached about 400 micro molcL sup(-1). These findings suggest that the SO4 sup(2-) may be derived from FeS2, which is unevenly distributed in the watershed, and that different mechanisms may control the leaching of dissolved Al and Fe into the soil water.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top