Can we assume insignificant temporal changes in spatial variations of sap flux for year-round individual tree transpiration estimates? A case study on Cryptomeria japonica in central Taiwan

Author

• Han Tseng
• Chen-Wei Chiu
• Sophie Laplace
• Tomonori KumeEmail author

1. 1.
2. 2.
3. 3.
4. 4.
5. 5.

Original Article

First Online: 

19 April 2017

DOI: 10.1007/s00468-017-1542-6

Cite this article as:

Tseng, H., Chiu, CW., Laplace, S. et al. Trees (2017). doi:10.1007/s00468-017-1542-6

Abstract

Key message

Although spatial variations in sap flux changed seasonally in cedar trees, neglecting these seasonal changes generally resulted in less than 10% errors in year-round tree transpiration estimates.

Abstract

Spatial and temporal variations in sap flux (Fd) affect the accuracy of year-round individual tree water use (Q) estimates. We aimed to determine seasonal changes in radial and azimuthal variations in Fd and to evaluate their potential impacts on year-round Q estimates for humid subtropical forest trees. We measured Fd using 38 probes in eight Cryptomeria japonica trees in Taiwan from July 2010 to May 2011. During the study period, the ratio of inner Fd to outermost Fd (Rr) ranged between 0.29 and 0.68. The ratio of mean outermost Fd to that at one direction (Ra) ranged between 0.36 and 1.89. The seasonal patterns were inconsistent among individuals. We compared year-round Q estimates derived from multi-sensor measurements (Qm) with those derived from measurements at a certain position with constant correction factors for radial (Qr) or azimuthal (Qa) patterns of Fd determined from the summer measurements. This simple exercise revealed consistent relationships between Qm and Qr year-round (<10% error), suggesting that seasonal changes in the radial profiles of Fd had little effect on Q estimates. Although using a constant correction factor for azimuthal variations led to 20–40% errors in Qa of some individuals with large azimuthal variations (i.e., CV > 0.49), five out of eight individuals had less than 10% errors in their Qa estimates. These results suggested that constant correction factors can be used for radial variations in year-round Q estimates, but are not applicable for azimuthal variations in individuals showing large azimuthal variations of Fd.

Keywords

Circumferential Radial profile Subtropical forest Sap flow 

Communicated by T. Grams.

Electronic supplementary material

The online version of this article (doi:10.1007/s00468-017-1542-6) contains supplementary material, which is available to authorized users.

Supplementary material

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Supplementary material 1 (DOCX 27 KB)

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