Availability of nitrogen and phosphorus in Norway spruce forest floors fertilized with nitrogen and other essential nutrients
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
The influence of various fertilization treatments on the availability of N and P in the forest floor was studied in a Danish Norway spruce (Picea abics (L.) Karst.) stand. The treatments included fertilization with N alone in two doses, N combined with lime and other essential nutrients, and lastly lime and nutrients other than N. We tested the hypotheses that fertilization with N alone would increase the availability of N and P in forest floors, and that fertilization with N in combination with lime and other nutrients would further increase N and P availability. Extractable and mineralizable NH4-N, NO3-N, and PO4-P 2 and 3 years after application of fertilizers were the indicators of N and P availability. Microbial activity as reflected by basal respiration rates was not affected by any of the fertilization treatments. The extractable and mineralizable amounts of N both indicated that N fertilization did not increase the availability of N in forest floors. Combined fertilization with N and other essential nutrients including lime reduced N availability, and application of lime and other nutrients than N resulted in the lowest N availability of all treatments. Nitrification rates were, however, increased after application of the highest amount of N and after application of lime. The replication over 2 years showed a consistent pattern, and treatment responses mainly occurred in the LF layer of forest floors. Phosphorus availability increased following liming and fertilization with nutrients other than N; this occurred in the H layer of forest floors. The results did not support the hypothesis that N fertilization increases N availability in the forest floor. There was also no evidence of a sustained positive effect on N availability of combined fertilization with N, lime, and other nutrients. In fact, N availability was reduced by the application of other nutrients and lime, whereas the study suggests that this treatment may positively affect P availability in a longer-term perspective. (C) 2002 Elsevier Science Ltd. All rights reserved.
Originalsprog | Engelsk |
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Tidsskrift | Soil Biology & Biochemistry |
Vol/bind | 34 |
Udgave nummer | 9 |
Sider (fra-til) | 1243-1251 |
Antal sider | 9 |
ISSN | 0038-0717 |
Status | Udgivet - 2002 |
Eksternt udgivet | Ja |
ID: 40548045