除草剂污染及其对澳大利亚昆士兰州赫维湾海草草甸的潜在影响。
Herbicide contamination and the potential impact to seagrass meadows in Hervey Bay, Queensland, Australia.
作者信息
McMahon Kathryn, Bengtson Nash Susan, Eaglesham Geoff, Müller Jochen F, Duke Norman C, Winderlich Steve
机构信息
Centre for Marine Studies, University of Queensland, Brisbane, Queensland 4072, Australia.
出版信息
Mar Pollut Bull. 2005;51(1-4):325-34. doi: 10.1016/j.marpolbul.2004.10.045. Epub 2004 Nov 19.
Low concentrations of herbicides (up to 70 ng l(-1)), chiefly diuron (up to 50 ng l(-1)) were detected in surface waters associated with inter-tidal seagrass meadows of Zostera muelleri in Hervey Bay, south-east Queensland, Australia. Diuron and atrazine (up to 1.1 ng g(-1) dry weight of sediment) were detected in the sediments of these seagrass meadows. Concentration of the herbicides diuron, simazine and atrazine increased in surface waters associated with seagrass meadows during moderate river flow events indicating herbicides were washed from the catchment to the marine environment. Maximum herbicide concentration (sum of eight herbicides) in the Mary River during a moderate river flow event was 4260 ng l(-1). No photosynthetic stress was detected in seagrass in this study during low river flow. However, with moderate river flow events, nearshore seagrasses are at risk of being exposed to concentrations of herbicides that are known to inhibit photosynthesis.
在澳大利亚昆士兰州东南部赫维湾的缪勒氏大叶藻潮间带海草草甸附近的地表水中，检测到低浓度的除草剂（最高达70纳克/升），主要是敌草隆（最高达50纳克/升）。在这些海草草甸的沉积物中检测到了敌草隆和莠去津（沉积物干重中最高达1.1纳克/克）。在中等河流流量事件期间，与海草草甸相关的地表水中除草剂敌草隆、西玛津和莠去津的浓度增加，这表明除草剂从集水区被冲刷到了海洋环境中。在中等河流流量事件期间，玛丽河中的除草剂最大浓度（八种除草剂的总和）为4260纳克/升。在本研究中，低河流流量期间海草未检测到光合应激。然而，在中等河流流量事件期间，近岸海草有暴露于已知会抑制光合作用的除草剂浓度的风险。
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