T-Shape point dendrometers (LoRaWAN)

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T-Shape point dendrometers (LoRaWAN)

0.00

 (Natkon ZN11-T-WP & Natkon ZN11-T-IP)

LoRaWAN compatible sensor device

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Live Demo

The frame is made out of one piece of carbon fibre (CFK) and is consequently combined with stainless steel elements (rods and nuts).  Applicable for tree stems > 7 cm in diameter.

What is detected?

Diurnal stem radius fluctuations are mainly influenced by changes of the thickness of living tissues of the bark (mainly phloem cells). The thickness changes depend 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 While water is withdrawn from the bark through transpiration during the daytime, at night the tissue is replenished.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. An additional but smaller contribution comes from tensions within the wood and the growth and death of the phloem cells. 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. 
  • Easy to mount.
  • Minor disturbance of the tree stem.
  • Very robust and weather-proof materials, sealed electronic displacement transducer, weather-roof plug.
  • Constructed, produced and tested by experts in tree physiology. Made in Switzerland.