Temporal variation in nutrient concentrations ofPinus sylvestrisneedles
作者:
Heljä‐Sisko Helmisaari,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1990)
卷期:
Volume 5,
issue 1-4
页码: 177-193
ISSN:0282-7581
年代: 1990
DOI:10.1080/02827589009382604
出版商: Taylor & Francis Group
关键词: foliar nutrients;nutrient mobility;seasonal variation;needle sampling;Pinus sylvestris
数据来源: Taylor
摘要:
Temporal variation in nutrient concentrations of Scots pine(Pinus sylvestrisL.) needles was studied during a three‐year period in three stands of differing stages of development. Concentrations of N, P and K varied significantly between years; this variation was related to differences in needle dry weight. Concentrations of all measured nutrients (N, P, K, Ca, Mg, Mn, Cu, Zn, Fe, B) and Al varied between seasons; this variation was related to nutrient mobility and the annual physiological cycle. Concentrations of the mobile nutrients N, P and K decreased in spring and early summer during shoot and needle elongation and increased in late summer and autumn during needle senescence and litterfall. Concentrations of Mg, Cu, Zn and B followed somewhat similar patterns. The poorly mobile nutrients Ca, Mn and Fe accumulated gradually in needles during each growing season. Needle nutrient concentrations were stable during the nonactive period.
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