Research progress in affecting factors of stem CO_2 efflux rate

HUANG Wei1,2,ZHU Jin-mao1,2,RUAN Hong-hua4,HUANG Ru-zhu1,2,WANG Jian1,3,ZHENG Huai-zhou1,3 (1Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education,Fuzhou 350007,China;2College of Life Science,Fujian Normal University,Fuzhou 350108,China;3College of Geographical Science,Fujian Normal University,Fuzhou 350007,China;4Faculty of Forest Resources and the Environment,Nanjing Forestry University,Nanjing 210037,China)

stem CO_2 efflux rate;stem respiration;biotic factor;abiotic factor

Stem CO2 efflux rate (FCO2) is a key component of the carbon cycle in forest ecosystem,accounting for 14%–48% of autotrophic respiration.To study the affecting factors of FCO2 would contribute to the understanding of global carbon cycle and of the responses of forest ecosystem to global climate change.This paper reviewed the effects of biotic and abiotic factors on FCO2,and indicated that these factors not only directly or indirectly affected the FCO2,but also acted interactively.Their contributions to FCO2 varied temporally and spatially.Though a considerable advancement has been achieved in recent years,some issues are still needed to be further studied:1) partitioning the FCO2 with effective methods,and analyzing the relationships between the FCO2 components and related affecting factors to reveal the FCO2 variation mechanism,2) incorporating the biotic and abiotic factors into FCO2 dynamic models to improve the accuracy of simulating FCO2,and 3) further approaching the temperature-adaptability of FCO2.