湿地生态系统CO2净交换、水汽通量及二者关系浅析

湿地生态系统碳循环是陆地碳循环研究中的重要组成部分,对于全球变化具有重要意义。水汽通量是影响湿地生态系统碳循环最重要、最基本的生态因子之一,与湿地生态系统CO2净交换密切相关。本文在总结湿地生态系统CO2净交换与水汽通量变化基本规律及其主要影响因子的基础上,从宏观和微观2个方面分析二者之间的内在关系。从宏观上看,湿地生态系统本身的特点决定了CO2净交换与水汽通量之间必然是相互影响、相互制约的;就微观而言,叶片尺度上的气孔行为是水分蒸腾和净碳通量这两个生理生态过程相互联系的纽带。最后,对湿地生态系统CO2净交换与水汽通量关系的研究方向提出展望。

Net CO2 Exchange and Water Vapour Flux in Wetland Ecosystem and Their Relationship

As an important component of the terrestrial carbon cycle,carbon recycling in wetland ecosystem plays a crucial role in global change.Water vapor flux is one of the most important and the most fundamental ecological factors affecting carbon recycling in wetland ecosystem and is therefore closely related to net CO_2 exchange in wetland ecosystem.Based on summarization of the basic laws and main affecting factors of net CO_2 exchange and water vapor flux in wetland ecosystem,relationship between the two is analyzed.Macroscopically,the interaction between net CO_2 exchange and water vapor flux is determined by characteristics of the wetland ecosystem per se,and microscopically stomatal behavior on the foliage scale is the link connecting water transpiration with net CO_2 exchange.Prospects of the research is predicted.