You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Instrument for Measuring Temperature, Photosynthetically Active Radiation and Daylength, and its Use in the Measurement of Daylength and Temperature in Coppice
P. L. Mitchell and F. I. Woodward
Journal of Applied Ecology
Vol. 24, No. 1 (Apr., 1987), pp. 239-249
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2403801
Page Count: 11
You can always find the topics here!Topics: Photoperiod, Coppicing, Photosynthetically active radiation, Forest canopy, Plants, Sensors, Woodlands, Plant growth, Plant ecology, Temperature measurement
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
1. An electronic instrument is described which integrates temperature and photosynthetically active radiation (PAR) to provide measurements of 24-h, day and night temperatures, PAR and daylength, averaged for the period between readings. The day/night threshold was set at 0.1-1.0 μmol m-2 s-1 PAR. 2. Measurements were made in chestnut (Castanea satwa Mill.) coppice in Sussex on five sites covering the first to tenth seasons of regrowth. Coppices are important sites for nature conservation and microclimatic measurements will aid experimental work on the ground flora. 3. Under a complete leaf canopy in summer, daylength was up to 1.5 h shorter than in the open and about 0.2 h shorter in winter. The night length for photoperiodism and the length of the respiring period are therefore extended for woodland plants in summer. 4. The sites with incomplete canopies were warmer (by 2-3⚬C, May-July) and had greater day/night temperature amplitudes than the sites with closed canopies.
Journal of Applied Ecology © 1987 British Ecological Society