|  |

| |

Enabling better global research outcomes in soil, plant & environmental monitoring.

SC-1 Leaf Porometer

The SC-1 Leaf Porometer is a battery-operated, menu-driven device used to measure stomatal conductance of leaves. The Leaf Porometer measures stomatal conductance by putting the conductance of a leaf in series with two known conductance elements, and comparing the humidity measurements between them.

SC-1 Leaf Porometer Features
Accurate, Affordable, Practical Stomatal Conductance

The SC-1’s breakthrough steady-state technology makes getting accurate stomatal conductance measurements affordable and practical for everyday research.

No Moving Parts

The SC-1’s steady state design means that it has no moving parts. It leaves the environment alone, and instead determines stomatal conductance by measuring the actual vapour flux from the leaf through the stomates and out to the environment.

Lightweight, Easy to Carry

The porometer weighs about half a pound (300g). You don’t have to haul it around the field with a neck strap; and if you get tired of carrying it, you can put it in your pocket.

Save and Download Data

Readings can be displayed as either conductance or resistance and saved for downloading later (RS232 cable and download utility software included).


Accuracy: 10%
Measurement/Conductance Range: 0-1000 mmol/m2s1
Operating Environment: 5 – 40°C; 0-100% relative humidity with desiccant chamber
Measurement Time: 30 seconds (in auto mode)
Measurement Units: mmol/m2s, m2s/mol, s/m
Sample Chamber Aperture: 6.35mm (.25 in)
Microcontroller Dimensions: 15.8 x 9.5 x 3.3 cm (6.2 x 3.75 x 1.3 in)
Data Storage: 4095 measurements
Data Retrieval: Direct via RS-232
Interface Cable: RS-232 serial cable (included)
Software: Leaf Porometer Utility (included)
Power Supply: Four type “AA” batteries (included)
Battery Life: 3 years (battery drain in sleep mode less than 50µA)
Sensor Head Cable Length: 1.2m (4 ft)
Desiccant: Indicating DrieRite, 10-20 mesh

ABOUT THE SC-1 Leaf Porometer

The Leaf Porometer measures the stomatal conductance of leaves by putting the conductance of the leaf in series with two known conductance elements. By measuring the humidity difference across one of the known conductance elements, the water vapour flux is known. The conductance of the leaf can be calculated from these variables. We know the humidity at three places: inside the leaf, and at both of the humidity sensors. The Leaf Porometer effectively calculates the resistance between the inside and outside of the leaf: the stomatal conductance. It measures resistance between the leaf and the first humidity sensor and the first and second sensors.

Anda, A. and W. Stephens (1996). Sugar Beet Production as Influenced by Row Orientation, Agronomy Journal, vol. 88, no., pp. 991-996.

Bauerle, W. L., T. M. Hinckley, J. Cermák, J. Kucera and K. Bible (1999).  The Canopy Water Relations of Old-growth Douglas-fir Trees, Trees, vol. 13, no., pp. 211-217.

Bucci, S. J., G. Goldstein, F. C. Meinzer, A. C. Franco, P. Campanello and F. G. Scholz (2005). Mechanisms Contributing to Seasonal Homeostasis of Minimum Leaf Water Potential and Predawn Disequilibrium between Soil and Plant Water Potential in Neotropical Savanna Trees, Trees, vol. 19, no., pp. 296-304.

Correia, M. J., M. L. Rodrigues, M. I. Ferreira and J. S. Pereira (1997). Diurnal Change in the Relationship between Stomatal Conductance and Abscisic Acid in the Xylem Sap of Field-grown Peach Trees, Journal of Experimental Botany, vol. 48, no. 314, pp. 1727-1736.

Motzer, T., N. Munz, M. Küppers, D. Schmidtt and D. Anhuf (2005). Stomatal Conductance, Transpiration and Sap Flow of Tropical Montane Rain Forest Trees in the Southern Ecuadorian Andes, Tree Physiology, vol. 25, no., pp. 1283 -1293.

Mumford, J. (2006). Application Note: First Look at Decagon’s New Porometer: Understanding the Four Methods to Measuring Stomatal Conductance. Pullman, Decagon.

Pataki, D. E., R. Oren and N. Phillips (1998). Responses of Sap Flux and Stomatal Conductance of Pinus taeda L. Trees to Stepwise Reductions in Leaf AreaJournal of Experimental Botany, vol. 49, no. 322, pp. 871-878.

Poudyal, K., P. K. Jha, D. B. Zobel and C. B. Thapa (2004). Patterns of Leaf Conductance and Water Potential of five Himalayan Tree Species, Tree Physiology, vol. 24, no., pp. 689-699.

Reynolds, M. P., C. Saint Pierre, A. S. I. Saad, M. Vargas and A. G. Condon (2007). Evaluating Potential Genetic Gains in Wheat Associated with Stress-Adaptive Trait Expression in Elite Genetic Resources under Drought and Heat Stress, Crop Science, vol. 47, no., pp. S-172-S-189.

Sansing, K., P. Kasemsap, S. Thanisawanyangkura, K. Sangkhasila, E. Gohet, P. Thaler and H. Cochard (2004). Xylem Embolism and Stomatal Regulation in two Rubber Clones (Hevea brasiliensis Muell. Arg.), Trees, vol. 18, no., pp. 109-114.

Stoll, M., B. Loveys and P. Dry (2000). Hormonal Changes Induced by Partial Rootzone Drying of Irrigated Grapevine, Journal of Experimental Botany, vol. 51, no. 350, pp. 1627-1634.

Uemura, A., A. Ishida, D. J. Tobias, N. Koike and Y. Matsumoto (2004). Linkage between Seasonal Gas Exchange and Hydraulic Acclimation in the Top Canopy Leaves of Fagus Trees in a Mesic Forest in Japan, Trees – Structure and Function, vol. 18, no. 4, pp. 452-459.

Wikberg, J. and E. Ögren (2004). Interrelationships between Water Use and Growth Traits in Biomass-producing Willows, Trees – Structure and Function, vol. 18, no. 1, pp. 70-76.