Table 1.
Overview of the leaf measurement campaign, in which samples from seven different tree genera were studied.
| Genus | Species/cultivar | Sample | Date measured, 2023-MM-DD |
Leaf mass, ± 1mg |
Signal amplitude, fT/Hz |
T 2, ms |
|---|---|---|---|---|---|---|
|
spruce
(Picea) |
Norway spruce (Picea abies) “Acrocona” |
S1 | 02-24 02-27 03-08 |
592 520 344 |
68.3 ± 2.2 26.7 ± 0.9 2.5 ± 0.5 |
197 ± 2 158 ± 2 164 ± 13 |
| S2 | 02-25 02-28 03-13 |
648 590 322 |
53.3 ± 2.1 27.0 ± 0.6 0.9 ± 0.7 |
151 ± 2 162 ± 2 290 ± 83 |
||
| Norway spruce (Picea abies) | S3 | 03-02 03-04 03-14 |
664 592 393 |
30.0 ± 1.1 11.7 ± 0.7 2.2 ± 0.8 |
193 ± 3 182 ± 4 258 ± 37 |
|
| S4 | 03-03 03-07 03-16 |
714 616 414 |
34.9 ± 3.3 27.4 ± 1.7 1.4 ± 0.7 |
310 ± 11 295 ± 7 296 ± 57 |
||
|
pine
(Pinus) |
mountain pine (Pinus uncinata) |
P1 | 03-09 | 1001 | 10.2 ± 1.0 | 196 ± 7 |
| P2 | 03-10 | 516 | 13.1 ± 0.8 | 173 ± 4 | ||
| dwarf mountain pine (Pinus mugo) | P3 | 03-17 | 512 | 26.3 ± 1.9 | 324 ± 9 | |
| P4 | 03-20 | 503 | 22.5 ± 1.5 | 264 ± 7 | ||
|
yew
(Taxus) |
common yew (Taxus baccata) |
Y1 | 03-22 | 596 | 4.5 ± 0.6 | 191 ± 10 |
| Y2 | 04-06 | 690 | 3.3 ± 0.5 | 182 ± 10 | ||
|
hazel
(Corylus) |
common hazel (Corylus avellana) |
H1 | 04-04 | 404 | 5.2 ± 0.7 | 193 ± 10 |
| H2 | 04-07 | 584 | 9.8 ± 0.7 | 209 ± 6 | ||
| H3 | 04-10 | 682 | 19.2 ± 1.2 | 262 ± 6 | ||
|
cherry
(Prunus) |
bird cherry (Prunus padus) |
C1 | 04-11 | 525 | 23.7 ± 3.9 | 223 ± 14 |
| C2 | 04-12 | 504 | 34.7 ± 5.1 | 189 ± 11 | ||
|
beech
(Fagus) |
European beech (Fagus sylvatica) “Rohanii” |
B1 | 05-04 | 463 | 48.6 ± 3.4 | 259 ± 7 |
| B2 | 05-05 | 446 | 44.2 ± 4.3 | 355 ± 13 | ||
|
oak
(Quercus) |
pubescent oak (Quercus pubescent) |
O1 | 05-17 05-23 05-30 |
932 738 721 |
70.3 ± 3.1 2.8 ± 0.8 3.5 ± 0.8 |
222 ± 4 348 ± 38 396 ± 33 |
| O2 | 05-19 05-25 05-31 |
531 323 254 |
36.0 ± 2.9 2.3 ± 1.0 4.1 ± 1.4 |
233 ± 7 536 ± 93 563 ± 75 |
Branchlets were freshly harvested in the Mainz Botanical Garden and transported to the lab in a beaker of distilled water for immediate sample preparation and measurement. Intact leaves were carefully dried and packed into a 2mL closed glass vial, which was weighed and inserted into the experimental apparatus for a 13h measurement (4096 scans). For dehydration studies (spruce and oak), sample vials were stored uncapped between measurements in a plant growth chamber at 22°C.