%0 Journal Article %1 Sparksetal_01 %A Sparks, J. P. %A Campbell, G. S. %A Black, R. A. %D 2001 %J Oecologia %K bibtex-import, citeulikeExport droughtbolism, freezebolism, hydraulics, snowgumpapermaybe, theory %P 468--475 %T Water content, hydraulic conductivity and ice formation in winter stems of Pinus contorta: a TDR case study %U http://www.springerlink.com/index/2XBWXD34K0CMJXJM.pdf %V 127

@article{Sparksetal_01, added-at = {2019-03-31T01:14:40.000+0100}, author = {Sparks, J. P. and Campbell, G. S. and Black, R. A.}, biburl = {https://www.bibsonomy.org/bibtex/2d084a5f361579e2ee1113fa4d330716b/dianella}, citeulike-article-id = {1524034}, citeulike-linkout-0 = {http://www.springerlink.com/index/2XBWXD34K0CMJXJM.pdf}, comment = {(private-note)TDR study Liquid water was always present: more than 25\% liquid in wood even as low as -20oC! Likely within cell wall material or within living cells. Tensions got down to -1.4MPa It was over winter that they did their study. Observed increases in stem water content likely to be because of direct water uptake by leaves, stems, not roots (too frozen) Negative water potentials not the sole cause of winter cavitation (air entry tension not reached, greater tension in summer than winter.). P. contorta winter cavitation depends on the shoot water potential during thawing and the number of freeze-thaw events during the winter. \textit{ A frozen conduit would exhibit a negative water potentials (depending on the pore size, water in frozen wood tissue may be at water potentials less than -100MPa) and thereby freduce the water potential of the thawing conduit. Therefore, more negative water potentials in adjacent conduits may induce cavitation in the thawing conduit. Consideration of such a mechanism should be the focus of future study.} Discrepancy between field measurements and embolism of twigs in water can be because of this. Sperry and Sullivan 1992: \textit{Freeze-induced cavitation is related to conduit size because larger bubbles may form in larger conduits}. **Very nice idea about why freezbolism occurs "A frozen conduit would exhibit a negative water potentila.s (depending on the pore size, water in frozen wood tissue may be at water potentials less than -100 MPa) and thereby reduce the water potential of the thawing conduit. Therefore, more negative water potentials in adjacent conduits may induce cavitation in the thawing conduit. Consideration of such a mechanism should be the focus of future study."}, interhash = {2fbc7dde31ad9d220839a7b7b4ca2515}, intrahash = {d084a5f361579e2ee1113fa4d330716b}, journal = {Oecologia}, keywords = {bibtex-import, citeulikeExport droughtbolism, freezebolism, hydraulics, snowgumpapermaybe, theory}, pages = {468--475}, posted-at = {2007-07-31 07:04:39}, priority = {2}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{Water content, hydraulic conductivity and ice formation in winter stems of Pinus contorta: a TDR case study}}, url = {http://www.springerlink.com/index/2XBWXD34K0CMJXJM.pdf}, volume = 127, year = 2001 }