Dual T-Shape point dendrometers (LoRaWAN)

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Dual T-Shape point dendrometers (LoRaWAN)

0.00

 (Natkon ZN12-T-2WP & Natkon ZN12-T-2IP)

LoRaWAN compatible sensor device

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The ZN12-T-2 range of dendrometers are T-shaped with two sensors to be mounted on tree stems >7 cm in diameter. The two sensors allow measuring stem radius changes over bark and on the xylem in parallel. The frame is made out of one piece of carbon fibre (CFK) and is consequently combined with stainless steel elements (rods and nuts).

The two electronic displacement-sensors (linear motion potentiometer) are of the same type as for the ZN11-T-WP and the former ZB06. Size of carbon fibre frame: 190 x 92 x 8 mm Weight (with thread rods): 180 g Frame: T-shaped carbon fibre frame, 3 stainless steel thread rods, 6 screw nuts, 6 washers, and 3 cap nuts. Displacement transducer: Two weather-proof but not sealed potentiometer for measuring in a µm resolution. The hub of the moving rod is 2 cm.

What is detected?

Diurnal stem radius fluctuations are mainly influenced by changes of the thickness of living tissues of the bark (mainly phloem cells). However, also the xylem undergoes size changes. The radial size changes depend on water tensions inside the stem and have an influence on the hydration status of the bark. While water is withdrawn from the bark through transpiration during the daytime, at night the tissue is replenished. As a result of this cycle, the diameter decreases during the day and increases at night. Over a period of weeks and months, this diurnal rhythm is altered by growth. New layers of xylem cells irreversibly increase the radius, particularly during wet periods in the growing season. In winter, ice formations in the wood induce strong decreases of the stem radius

Advantages in comparison to other products

  • No disturbances by deformations of the dead outermost layer of the bark, induced by temperature and air-humidity (a general argument in favour of point dendrometers and against band dendrometers).
  • Materials and electronic parts insensitive to temperature allow for more accurate measurements.
  • The spot of measurement is not influenced by the thread rods because it is neither in the vertical nor in the horizontal line of the anchor points.
  • The application to different stem expositions allows a spatial resolution of stem radius fluctuations. • Compatibility to most logging systems and easy to power with a stable 5V DC supply.
  • Easy to mount.
  • Minor disturbance of the tree stem.
  • Weatherproof materials.
  • Constructed, produced and tested by experts in tree physiology. Made in Switzerland.

Video below shows how to installed a point dendrometer