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title: On the ratio of intercellular to ambient CO2 (c(i)/c(a)) derived from ecosystem flux
author: Tan, Zheng-Hong;  Wu, Zhi-Xiang;  Hughes, Alice C.;  Schaefer, Douglas;  Zeng, Jiye;  Lan, Guo-Yu;  Yang, Chuang;  Tao, Zhong-Liang;  Chen, Bang-Qian;  Tian, Yao-Hua;  Song, Liang;  Jatoi, Muhammad Tahir;  Zhao, Jun-Fu;  Yang, Lian-Yan
Issued Date: 2017
Abstract: The ratio of intercellular to ambient CO2 concentrations (c(i)/c(a)) plays a key role in ecophysiology, micromete-orology, and global climatic change. However, systematic investigation on c(i)/c(a) variation and its determinants are rare. Here, the c(i)/c(a) was derived from measuring ecosystem fluxes in an even-aged monoculture of rubber trees (Hevea brasiliensis). We tested whether c(i)/c(a) is constant across environmental gradients and if not, which dominant factors control c(i)/c(a) variations. Evidence indicates that c(i)/c(a) is not a constant. The c(i)/c(a) exhibits a clear "V"-shaped diurnal pattern and varies across the environmental gradient. Water vapor pressure deficit (D) is the dominant factor controls over the c(i)/c(a) variations. c(i)/c(a) consistently decreases with increasing D. c(i)/c(a) decreases with square root of D as predicted by the optimal stomatal model. The D-driving single-variable model could simulate c(i)/c(a) as well as that of sophisticated model. Many variables function on longer timescales than a daily cycle, such as soil water content, could improve c(i)/c(a) model prediction ability. Ecosystem flux can be effectively used to calculate c(i)/c(a) and use it to better understand various natural cycles.
Related URLs: 10.1007/s00484-017-1403-4
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Recommended Citation:
Tan, Zheng-Hong,Wu, Zhi-Xiang,Hughes, Alice C.,et al. On The Ratio Of Intercellular To Ambient Co2 (c(i)/c(a)) Derived From Ecosystem Flux[J]. International Journal Of Biometeorology,2017,61(12):2059-2071.

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