大型丝状藻类对城市河流甲烷排放的影响研究进展

Effects of filamentous macroalgae on the methane emission from urban river:A review.

温室气体排放导致的全球变暖受到广泛关注.近期研究发现,经由河流系统排放的二氧化碳(CO_2)和甲烷(CH_4)可部分抵消陆地生态系统的碳固定量,从而使人们开始重新思考河流对于全球碳平衡和温室气体排放清单的影响.作为城市河流系统中重要的初级生产者,大型丝状藻类通过改变水-沉积物界面物理、化学以及生物等环境因子,深刻影响着河流生态系统的碳循环过程.本文从3个方面阐述大型丝状藻类对于城市河流中CH_4排放的影响:城市化对河流生态系统及其CH_4排放通量的影响;大型丝状藻类对自然河流系统中CH_4产生与排放过程的影响;大型丝状藻类对城市河流系统初级生产力及CH_4产生过程的影响.最后对目前存在的问题和今后的研究方向进行了展望.

The global warming caused by greenhouse gases emission has raised serious concerns. Recent studies found that the carbon dioxide （CO2 ） and methane （CH4 ） emissions from river eco- system can partly offset the carbon sequestration by terrestrial ecosystem, leading to a rethink of the effects of river ecosystem on the global carbon balance and greenhouse gases emission inventory. As an important primary producer in urban fiver ecosystem, the carbon cycle process of fiver system through changing filamentous macroalgae can deeply affect the abiotic and biotic factors in the inter- face of water-sediment. This paper reviewed the effects of filamentous macroalgae on the CH4 emis- sion from urban river system from the aspects of 1 ） the effects of urbanization on the river ecosystem and its CH4 emission flux, 2） the effects of filamentous maeroalgae on the CH4 generation and emis- sion process in natural river systems, and 3 ） the effects of filamentous macroalgae on the primary productivity and CH4 emission process in urban river systems. The current problems and future di- rections in related researches were discussed and prospected.