作 者：
王玉超;徐璇;曹鹏鹤;刘渤然;周艳;金昌善;王维枫
单 位：
武夷山国家公园科研监测中心;南京林业大学生物与环境学院
关键词：
源头溪流;溪流;二氧化碳分压;二氧化碳排放通量;可溶性有机碳
摘 要：
陆源碳经内陆水体生态系统输出是全球碳循环的关键一环,其中溪流碳排放超过内陆水体平均碳排放,影响区域乃至全球碳收支。本文通过对前人的研究结果进行总结,归纳了当前溪流二氧化碳分压(pCO_2)、二氧化碳排放通量(FCO_2)的动态变化特征,二者均表现出明显的昼夜变化和季节变化特征,且随溪流分级的增大而减小;梳理了影响溪流pCO_2和FCO_2的物理、水化学及生物因素,如流速、pH、水生生物量等;发现随溪流分级的增大,内源二氧化碳排放占比增大,但排放占比仍低于50%;分析了溪流二氧化碳排放研究中面临的挑战,如测量技术问题和缺乏长期连续监测等。本文通过对溪流二氧化碳排放的综述,希望能够为溪流碳循环的研究提供新的思路和方向。
译 名：
A review of carbon dioxide emissions from streams
作 者：
WANG Yu-chao;XU Xuan;CAO Peng-he;LIU Bo-ran;ZHOU Yan;JIN Chang-shan;WANG Wei-feng;College of Biology and the Environment, Nanjing Forestry University;Research and Monitoring Center of Wuyishan National Park;
关键词：
headwater;;stream;;partial pressure of carbon dioxide;;carbon dioxide flux;;dissolved organic carbon
摘 要：
The export of terrestrial carbon via inland aquatic ecosystems is a key process in global carbon cycle. Carbon emission from streams is greater than average carbon emission from inland water bodies, affecting the regional and global carbon budget. We summarized the temporal change of partial pressure of carbon dioxide(pCO_2) and carbon dioxide flux(FCO_2) across water bodies and atmosphere. Both pCO_2 and FCO_2 showed significant diurnal and seasonal variations, and decreased with increasing stream order. We discussed the physical, hydrochemical, and biological factors affecting stream pCO_2 and FCO_2, such as flow velocity, pH, and aquatic biomass. The contribution of autochthonous organic carbon to FCO_2 increased with stream order, which was usually lower than 50%. We outlined the challenges in future research on stream carbon cycling, such as measurement technical problems and the lack of continuous monitoring over time. We hope this review could provide new ideas and future research directions to enhance our understanding on the role of streams in the global carbon cycle.
