Table 1 Site characteristics and sequence of silvicultural events in two under-canopy vegetation-control pine trials in South Africa
From: Impacts of under-canopy vegetation on stand growth in two pine saw-timber stands, South Africa
Site information | Trial name | ||
|---|---|---|---|
Dargle plantation | Kwambonambi plantation | ||
Province and district | KwaZulu-Natal, Midlands | KwaZulu-Natal, Zululand | |
Latitude | 29° 33,860′ S | 28° 36.293′ S | |
Longitude | 30° 01,404′ E | 32° 11,690′ E | |
Soil | Depth (m) | > 1.5 | > 1.5 |
Texture | Clay (6% sand; 32% silt; 62% clay) | Sand (92% sand; 5% silt; 3% clay) | |
Organic carbon (%) | 5.5 | 0.5 | |
Elevation (m a.s.l.) | 1430 | 40 | |
Mean annual precipitation (mm) | 1000 | 1242 | |
Mean annual temperature (°C) | 15.8 | 21.7 | |
Climate class | Cool temperate | Sub-tropical | |
Site productivity as indicated by the mean top height of all trees remaining after 2nd thinning | 21.5 m at age 18.3 years | 24.3 m at age 17.5 years | |
Species planted | Pinus patula | Pinus tecunumanii | |
Date planted | 15 October 1992 | 15 September 1993 | |
Planting density | 813 stems ha−1 (3.5 m × 3.5 m) | 813 stems ha−1 (3.5 m × 3.5 m) | |
Vegetation management treatments first imposed | 9 December 1997 | 22 August 1996 | |
Pruning | 1st pruning (1.5 m lift) | May 1997 | August 1996 |
2nd pruning (3 m lift) | August 1998 | June 1999 | |
3rd pruning (5 m lift) | May 2001 | June 2001 | |
4th pruning (7 m lift) | March 2003 | – | |
Thinning | 1st thinning (c. 400 stems ha−1) | March 2006 (13.2 years) | November 2005 (12.2 years) |
2nd thinning (c. 250 stems ha−1) | March 2011 (18.3 years) | March 2011 (17.5 years) | |