Table 2.
Root size and branching characteristics
| Tree D | Tree S | Tree D |
Tree S |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Variable | Unit | total | up | pp | do | up | pp | do | |
| Length | m | 432 | 172 | 24% | 56% | 21% | 7·6% | 45% | 48% |
| Dry weight | kg | 79·6 | 32·8 | 39% | 48% | 13% | 4·8% | 28% | 67% |
| Root number | n | 706 | 347 | 26% | 58% | 17% | 6·3% | 42% | 52% |
| Mean inter-lateral length | cm | 10·2 | 10·7 | 11·1 | 10·8 | 6·84 | 13·2 | 11·8 | 9·6 |
| Mean branching angle | degree | 46 | 44·8 | 46·1 | 46·3 | 44·9 | 51·2 | 39·9 | 47·9 |
| Percentage of root dry weight in several root types | |||||||||
| Order 2 roots | % | 51·9 | 70·5 | 60·4 | 46·7 | 45·9 | 84·1 | 75·5 | 67·5 |
| ZRT | % | 13·8 | 10·8 | 13·3 | 16·1 | 7·1 | 5·04 | 29 | 3·7 |
| Parallel* | % | 47·6 | 24·6 | 55·4 | 44·7 | 35 | 18·8 | 61·9 | 9·7 |
| Oblique* | % | 24·7 | 33·9 | 27·4 | 24·3 | 17·8 | 0·4 | 18·6 | 42·6 |
| Perpendicular* | % | 27·8 | 41·5 | 17·2 | 31 | 47·2 | 80·8 | 19·5 | 47·7 |
| Shallow | % | 66 | 33·4 | 72·1 | 62·3 | 61·2 | 60·3 | 67·2 | 17·7 |
| Intermediate | % | 31·4 | 61·4 | 26·8 | 34·3 | 34·6 | 39·7 | 32·3 | 74·8 |
| Deep | % | 2·6 | 5·24 | 1·1 | 3·38 | 4·1 | 0 | 0·5 | 7·5 |
Entire root systems and % or value in each slope orientated sector: upslope/perpendicular to slope/downslope (respectively ‘up’, ‘pp’ and ‘do’). Angle toward soil surface and distance to the soil limits for three root classes: 30 and 50° toward soil surface and 0·5 and 1·1 m distance to soil surface. ZRT, zone of rapid taper of horizontal shallow roots, near the stump.
* Angle toward soil surface is computed on a per root basis, the other variables on a per segment basis.