摘要
美国、欧洲等长期监测表明,地表水体可溶性有机碳(DOC)有逐渐增高的趋势,水体DOC增高将导致地表水有机酸增加、pH变化缓冲能力增加、水体颜色增加、水体可见光和紫外光穿透能力降低等,也会对淡水养殖业、饮用水质量、河口和沿海生态系统、碳循环带来广泛的影响。大多数河流有机碳的浓度对水文过程响应非常敏感,流域的地质和岩石特征影响着河流水体的DOC含量。在空间分布上,DOC同温度呈反相关,但在时间变化和特定监测点位,水中DOC同温度呈正相关。酸沉降、CO2浓度增高和氮富集等变化也可能影响地表水体DOC的变化。中国生态系统研究网络(CERN)唯有三江湿地站从2004年开始监测地表水中DOC含量,其他关于水体DOC变化的长期监测和影响因子研究很少,在我国典型生态系统开展地表水、土壤水DOC长期监测与影响因子研究具有重要的意义。
There are long-term increases in surface water dissolved organic carbon（DOC） on the American and the European long-term monitoring sites. Dissolved organic carbon affects the functioning of aquatic ecosystems through its influence on the increases in organic acid, acid neutralizing capacity, water colour, and on the decreases in penetrability of visible light and ultraviolet light. It also affects freshwater aquaculture, drinking water quality, estuarine and marine ecosystems, as well as a transfer of carbon from terrestrial to aquatic and marine ecosystems, forms a significant component of the global carbon cycle. The DOC concentrations in most of the rivers are very sensitive to the response of hydrological process, and to the background of watershed soil and geology. Spatially, there is a negative relationship between dissolved organic carbon and temperature. However, the influence of temperature on temporal variations at an individual site appears very different. It has been suggested that temperature, acid deposition change, atmospheric CO2 and nitrogen enrichment were potential drivers of change in DOC in surface water. There are few long-term monitoring and research about surface water dissolved organic carbon in China except the Sanjiang wetland site of Chinese Ecosystem Research Network where monitoring the surface water dissolved organic carbon was launched in 2004. It is important to set up long-term monitoring and research of water dissolved organic carbon in typical ecosystems in China.
出处
《水土保持研究》
CSCD
北大核心
2009年第3期286-290,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(30600091,40701186)
中国科学院知识创新工程青年人才领域前沿项目(O7V70130SZ)
关键词
可溶性有机碳
长期监测
变化趋势
影响因子
dissolved organic carbon
long term monitoring
variation trend
influencing factor
