Long-term effects on soil-water nitrogen and pH of clearcutting and simulated disc trenching of previously nitrogen-fertilised pine plots
| Autor: | Hans-Örjan Nohrstedt, Staffan Jacobson, Lars Högbom, Gunnar Jansson, Eva Ring |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
040101 forestry
Clearcutting Global and Planetary Change Ecology chemistry.chemical_element Forestry 04 agricultural and veterinary sciences 010501 environmental sciences 01 natural sciences Nitrogen chemistry Boreal Soil pH Environmental chemistry Soil water 0401 agriculture forestry and fisheries Environmental science Soil solution Leaching (agriculture) 0105 earth and related environmental sciences |
| Zdroj: | Canadian Journal of Forest Research. 48:1115-1123 |
| ISSN: | 1208-6037 0045-5067 |
| Popis: | Forest fertilisation with nitrogen (N) typically increases N leaching for 1–2 years. Some studies have reported effects also after clearcutting. This study presents an analysis of soil-water chemistry data from the 3rd to the 15th year after clearcutting of fertilised experimental plots on a low-fertility site in Sweden. Before clearcutting in 1987, study plots had been fertilised with NH4NO3 in 1967, 1974, and 1981, resulting in total applications ranging from 0 to 1800 kg N·ha−1. In 1989, disc trenching was simulated by manual digging on small subplots within the fertilised main plots. Soil-water samples were collected at a depth of 50 cm. Previous N fertilisation and site preparation, respectively, affected (p < 0.05) the total N and NO3–-N concentrations and pH of soil water, but no statistical interaction between fertilisation and site preparation was found. The NO3–-N concentration was elevated for total N applications above 720 kg·ha−1 (mean NO3–-N concentration of 0.93 mg·L−1 for 1080 kg N·ha−1, 1.6 mg·L−1 for 1440 kg N·ha−1, and 2.4 mg·L−1 for 1800 kg N·ha−1 compared with 0.20 mg·L−1 for the control) and lower after simulated disc trenching (0.63 mg·L−1) than in nontrenched soil (1.3 mg·L−1). The elevations in the soil-water NO3–-N concentration for the fertiliser treatments seemed to be related to changes in the soil N store created by previous fertilisation. |
| Databáze: | OpenAIRE |
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