A validation, comparison and error analysis of two heat-pulse methods for measuring sap flow in Eucalyptus marginata saplings

Functional Plant Biology : FPB
Timothy M BlebyMark A Adams

Abstract

We validated and compared two heat-pulse methods for measuring sap flow in potted Eucalyptus marginata Donn ex. Smith (jarrah) saplings. During daylight hours and under well-watered conditions, rates of sap flow (0.1-0.5 kg h-1) measured by the established compensation heat-pulse method (CHPM) and the newly developed heat-ratio method (HRM) were similar to rates measured with a weighing lysimeter, and most of the time there was no significant difference (P<0.001) between methods. The HRM accurately described sap flow at night when rates of flow were low (< 0.1 kg h-1) or near zero, but the CHPM was unable to measure low rates of sap flow due to its inability to distinguish heat-pulse velocities below a threshold velocity of 0.1 kg h-1 (3-4 cm h-1). The greatest potential for error in the calculation of daily sap flow was associated with the misalignment of temperature sensors, the estimation of sapwood area and the method used to acquire total sap flow from point measurements of sap velocity. A direct comparison of the two heat-pulse methods (applied synchronously) revealed that the HRM had a more convincing mechanism for correcting spacing errors and was more resistant to random fluctuation in measurements than the CHPM. While...Continue Reading

References

Apr 17, 2001·Tree Physiology·S S BurgessT M Bleby
Jun 19, 2002·Tree Physiology·Fabian G ScholzAugusto C Franco
Mar 26, 2003·Tree Physiology·Peter Becker, W. R. N. Edwards
Mar 26, 2003·Tree Physiology·Stan D. WullschlegerR. A. Vertessy
Mar 26, 2003·Tree Physiology·A. Guevara-EscobarA. D. Mackay
May 6, 2003·Journal of Experimental Botany·Nadezhda Nadezhdina, Jan Cermak
Jan 1, 1997·Tree Physiology·W R EdwardsJ Cermák
Sep 1, 1992·Tree Physiology·T J HattonW R Dawes
Jun 1, 1990·Tree Physiology·T J HattonR A Vertessy
Nov 1, 1958·Plant Physiology·D C Marshall
Jul 1, 1998·Oecologia·Stephen S O BurgessChin K Ong

❮ Previous
Next ❯

Citations

Jan 14, 2017·Clinical Toxicology : the Official Journal of the American Academy of Clinical Toxicology and European Association of Poisons Centres and Clinical Toxicologists·Betty S ChanNicholas A Buckley
May 3, 2018·Modern Rheumatology·Hideto KamedaUNKNOWN Japan College of Rheumatology subcommittee on the guideline for the use of methotrexate in patients with rheumatoid arthriti
Jul 6, 2014·Tree Physiology·Michael A Forster
Apr 1, 2009·Oecologia·A P O'GradyD Worldege
Aug 19, 2010·Plant, Cell & Environment·Timothy M BlebyRobert B Jackson

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.