摘要
针对珠江口近20多年来咸潮超常上溯的情况,通过现场调查监测及与文献资料对比,研究了咸潮上溯对河口区河道水质、地下水水质、土壤和植物生态的影响,结果表明,咸潮上溯抑制河道水体中铵盐的硝化作用,并导致咸潮入侵河段溶解氧(DO)含量增加;珠江西四口门各入海河道上游优势植物群落已由喜淡水植物变为广适性植物.由于受堤围和水闸控制,咸潮上溯的环境影响主要发生在入海主河道,河口区河涌水质与陆地植被、地下水及农业土壤基本未受咸潮上溯的影响.
Unusual saltwater intrusion in the Pear River Estuary in recent two decades has caused serious problem to water supply and drawn much attention. Field survey monitoring was conducted in this study to investigate impact of the unusual saltwater intrusion on surface water and groundwater quality, soil and plant ecosystem. It is found that salt water intrusion suppresses nitrification of ammonium and increases DO concentration in the waterway. Dominant plant communities in the upper reaches of the western four waterways have evolved from the autopotamic into the eurytopic due to saltwater intrusion. However, the above-mentioned impacts happen only within the main streams of the waterways, while water quality in large amount of small streams of the river net work, groundwater quality, agricultural soil and plant ecosystem outside the main streams remain uninfluenced due to the protection of dams and water gates.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2013年第S1期79-86,共8页
China Environmental Science
基金
环保公益性行业科研专项(200709049)
关键词
珠江口
咸潮上溯
环境影响
对策
Pearl River Estuary
saltwater intrusion
environmental impact
countermeasures
