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- Title
On the ratio of intercellular to ambient CO ( c / c ) derived from ecosystem flux.
- Authors
Tan, Zheng-Hong; Wu, Zhi-Xiang; Hughes, Alice; Schaefer, Douglas; Zeng, Jiye; Lan, Guo-Yu; Yang, Chuang; Tao, Zhong-Liang; Chen, Bang-Qian; Tian, Yao-Hua; Song, Liang; Jatoi, Muhammad; Zhao, Jun-Fu; Yang, Lian-Yan
- Abstract
The ratio of intercellular to ambient CO concentrations ( c / c ) plays a key role in ecophysiology, micrometeorology, and global climatic change. However, systematic investigation on c / c variation and its determinants are rare. Here, the c / c was derived from measuring ecosystem fluxes in an even-aged monoculture of rubber trees ( Hevea brasiliensis). We tested whether c / c is constant across environmental gradients and if not, which dominant factors control c / c variations. Evidence indicates that c / c is not a constant. The c / c 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 / c variations. c / c consistently decreases with increasing D. c / c decreases with square root of D as predicted by the optimal stomatal model. The D-driving single-variable model could simulate c / c 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 / c model prediction ability. Ecosystem flux can be effectively used to calculate c / c and use it to better understand various natural cycles.
- Subjects
FOREST canopies; PHOTOSYNTHESIS; HEVEA; ATMOSPHERIC water vapor; ECOSYSTEM management
- Publication
International Journal of Biometeorology, 2017, Vol 61, Issue 12, p2059
- ISSN
0020-7128
- Publication type
Article
- DOI
10.1007/s00484-017-1403-4