Table 2.
Spearman coefficients rSp of correlations between plastic loads (surface and depth sampling) and terrain height or distance to sewage sludge application area.
| Field | Plastic loads | Variablesa | rSP | p-value | Significanceb | n |
|---|---|---|---|---|---|---|
| LK | Surface plastic load (p m2) | A | 0.12 | 0.6325 | n.s | 18 |
| B | − 0.49 | 0.0417 | * | 18 | ||
| HB | A | − 0.49 | 0.1544 | n.s | 10 | |
| B | − 0.65 | 0.0490 | * | 10 | ||
| LK | Average MP load (p kg−1) | A | − 0.24 | 0.3350 | n.s | 18 |
| B | − 0.65 | 0.0046 | * | 18 | ||
| 0–30 cm MP load (p kg−1) | A | − 0.15 | 0.5581 | n.s | 18 | |
| B | − 0.52 | 0.0255 | * | 18 |
aA: Surface height at central sector point (m a.s.l.), B: Distance to central sewage sludge application area (m).
bSignificant * if p ≤ 0.05, n.s = not significant.