NDLI: Availability of residual fertilizer $^{15}$ N from forest floor and mineral soil to Douglas-fir seedlings ten years after fertilization

Content Provider	Springer Nature Link
Author	Swanston, Christopher W. Preston, Caroline M.
Copyright Year	2014
Abstract	As low initial uptake and essentially zero later uptake limit efficacy of N fertilization for temperate conifers, we investigated factors limiting long-term tree uptake of residual $^{15}$ N-labeled fertilizer.We used a pot bioassay to assess availability of $^{15}$ N from soil sampled 10 years after fertilization of a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand with $^{15}$ N-urea (200 kg N ha$^{−1}$). Douglas-fir seedlings were grown for 2 years in organic (designated LFH) and mineral soil (0–10 cm) layers reconstructed from control and fertilized plots; residual fertilizer N amounted to 10 % of LHF and 5 % of MIN N.Percentage recovery of residual $^{15}$ N in seedlings was not affected by the original season of fertilization (spring vs. fall), but differed by the source of $^{15}$ N excess. LFH was a better source of residual $^{15}$ N; 12.4 % of residual LFH $^{15}$ N was taken up by seedlings and 7.6 % transferred to soil, whereas mineral soil yielded only 8.3 % of residual $^{15}$ N to seedling uptake and 2.4 % to LFH. Extractable inorganic N was 2–3 orders of magnitude higher in fallow pots.Ten-year residual fertilizer $^{15}$ N was clearly cycling between LFH and mineral soil and available to seedlings, indicating that other factors such as denitrification, leaching, and asynchrony of soil N mineralization and tree uptake limit long-term residual N fertilizer uptake in the field.
Starting Page	381
Ending Page	394
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	381
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-05-14
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Douglas-fir Forest fertilization Seedling bioassay $^{15}$ N Nitrogen Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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