Scarification,fertilization and herbicide treatment effects on planted conifers and soil fertility |
| |
Authors: | Burgess D Baldock J A Wetzell S Brand D G |
| |
Institution: | (1) Petawawa National Forestry Institute, Canadian Forest Service, KOJ lJO Chalk River, Ontario, Canada;(2) Science and Sustainable Development Directorate, Canadian Forest Service, KlA lG5 Hull, Quebec, Canada |
| |
Abstract: | The influences of soil surface modification (blade scarification and plastic mulching), fertilization and herbicide application on soil nutrient and organic carbon content and tree growth and foliar nutrient status were examined after seven years in a study located within the Great Lakes-St. Lawrence forest region of Canada. Plots had been planted with white pine (Pinus strobus L.) and white spruce (Picea glauca Moench] Voss) seedlings. Light (PAR), soil moisture and temperature were monitored and recorded throughout the growing season. Forest floor and soil mineral (0–20 cm layer) samples were collected from all experimental plots, except those which had plastic mulching. Foliar samples were collected in autumn and analysed for N, P and K and storage compounds. Seedling mortality was 20% higher in unscarified plots. Combined silvicultural treatments increased productivity as much as 14 times, but scarification reduced soil carbon and nutrient capital 2–3 fold. Herbicide application reduced soil carbon by at least 20 %. Foliar nutrient, protein, starch and lipid contents in autumn were little affected by treatment. The future management of such stands in Canada probably will include more shelterwood harvesting and crop rotations, silvicultural systems that are more closely aligned with natural forest succession. |
| |
Keywords: | growth nutrient availability Pinus strobus Picea glauca site preparation soil organic carbon |
本文献已被 SpringerLink 等数据库收录! |
|