Dendrometer for stem

Dendrometer

Nondestructive Absolute Linear MIJ-02LMS S-size (For sample size of dia1.5～23mm)

Dendrometers measure daily changes of trunk or stem caused by construction factors such as photosynthesis, transpiration, and sapflow; and also by hypertrophy factor which occur by the water storage during night time from root to trunk. Measuring annual changes is same as measuring speed of secondary growth and carbon fixation. Also it helps to analyze the data of the mid-term phenomenon that will change weekly from excess water stress.

We recommend our Dendrometer MIJ-02 LMS to researchers by following reasons.

The purpose of developing non-destructive dendrometer is because thin plants have less destruction resistance. Sample cross section will be narrowed from 3 directions of 120°division that mean offset placement of fastening part to samples. In other words, it  minimizing the sample stress from equipping instruments. This stress-free structure has one more advantage that is the sensor will not take time to fit to the sample; thus, it is possible to acquire the valid measurement data right after mounting the sensor to the samples. Generally, trunk or stem will change ± several dozen µm but MIJ02-LMS dendrometer can measure tiny changes, so we set the measurement resolution less than 1 um. It depends on the resolution of data logger but generally it can gain the data with  less than 0.01um resolution. (0.00911um/0.01mV.) Annual change of tropical rain forest will grow diameter direction around 10mm per year and only a few mm per year in temperate environment. Measurement range of LMS is φ1.5mm~23mm which could be enough to measuring thin sample. As annual changes, individual carbon fixation and production from individual sample will be the direct index that will be able to lead estimation of whole canopy value.

Figure1. Orange Sapling Stem growth (Click figure for enlarge)

Measured Period: May 11 to July 31
Above graph shows how Orange sapling stem growth.
As you can see there is no dramatic or rapid changes occur before harvesting fruit,
after fruit harvested the stem showed rapid growth.
Sapling is thin so dendrometer for tree cannot measure thin sample but MIJ-02 LMS
can measure thin target growth changes in micrometer.

Equipment used for this measurement: MIJ-02LMS TypeII & MIJ01 Data Logger