Major element chemistry of sediments from the Darling–Barwon river and its tributaries: implications for sediment and phosphorus sources
Major element chemistry of sediments from the Darling–Barwon river and its tributaries: implications for sediment and phosphorus sources
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DOI：
10.1002/(sici)1099-1085(200005)14:7
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发表时间：
2000-05
影响因子：
3.2
通讯作者：
J. Olley;G. Caitcheon
中科院分区：
文献类型：
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作者：
J. Olley;G. Caitcheon
1991年，澳大利亚最长的河流之一达令-巴翁河（Darling-Barwon）经历了世界上有记录以来最大的藻类水华之一。近1000公里的河流受到影响。在水华发生时，来自人类活动的磷被认为是主要原因。在这项研究中，我们使用主要元素化学研究的沉积物和沉积物相关的磷输送到达令-巴翁河的来源。我们发现，沉积物主要来自集水区的沉积和花岗岩基岩区，而不是密集养殖的玄武岩地区。我们还表明，目前在运输中的Darling-Barwon的沉积物并不源自当代高地侵蚀，但可能是来自低地地区的集水区，包含更多的风化材料。沉积物中的磷浓度与该地区自然土壤中的磷浓度一致，两个沉积物岩心的证据表明，磷浓度在过去200年中没有发生显着变化。这些研究结果的藻类生长控制策略的影响进行了讨论。版权所有© 2000约翰威利父子有限公司。
In 1991, one of Australia's longest rivers, the Darling–Barwon, experienced one of the world's largest recorded algal blooms. Nearly 1000 km of river were affected. At the time of the bloom phosphorus originating from anthropogenic sources was believed to be the principal cause. In this study we have used major element chemistry to examine the sources of sediment and sediment-associated phosphorus delivered to the Darling–Barwon River. We show that the sediments are derived primarily from the sedimentary and granitic bedrock areas of the catchment, not the intensively farmed basalt areas. We also show that the sediment currently in transport in the Darling–Barwon does not originate from contemporary upland erosion, but is probably derived from lowland areas of the catchment that contain more weathered material. Phosphorus concentrations in the sediments are consistent with those in natural soils of the region, and evidence from two sediment cores indicates that phosphorus concentrations have not changed significantly in the last 200 years. The implications of these findings for algal growth control strategies are discussed. Copyright © 2000 John Wiley & Sons, Ltd.