tailieunhanh - Báo cáo khoa học: "Needle nutrients in geographically diverse Pinus sylvestris L. populations"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Needle nutrients in geographically diverse Pinus sylvestris L. populations. | Ann. For. Sci. 59 2002 1-18 INRA EDP Sciences 2002 DOI forest 2001001 1 Original article Needle nutrients in geographically diverse Pinus sylvestris L. populations Jacek Oleksyna b 5 Peter B. Reichb Roma Zytkowiaka Piotr Karolewskia and Mark G. Tjoelkerb c aInstitute of Dendrology Polish Academy of Sciences Parkowa 5 PL-62-035 Kórnik Poland b Department of Forest Resources University ofMinnesota 115 Green Hall 1530 Cleveland Avenue N. MN 55108-6112 USA c Department of Forest Science Texas A M University College Station TX 77843-2135 USA Received 13 March 2001 accepted 21st May 2001 Abstract - Nutrient availability differs across climatic gradients yet the role of genetic variation in potentially adaptive traits related to nutrient acquisition remains poorly understood. We examined needles of diverse Scots pine provenances grown under common-garden conditions throughout their entire life span. Based on similarities in nutrient concentration patterns two groups of populations were identified. One comprised northern populations from 60o to 56o N and another included populations from locations between 56o and 49o N. Northern populations sustained significantly higher concentrations of N P Ca Mg Na Zn Cu and Pb. Only K concentration was persistently lower in northern plants. We conclude that intraspecific genetic differences exist in foliage nutrient concentration among diverse populations. Since in northern conditions nutrient availability is often limited as a result of interactions between temperature litter quality and its mineralization a tendency toward higher foliage concentrations of macronutrients can be an adaptive feature enhancing plants metabolic activity in their native habitats. provenance needle nutrients climate gradient seasonal pattern Scots pine Résumé - Les nutriments des aiguilles dans le pin sylvestre de differentes origines géographiques. La disponibilité des nutriments varie selon le gradient climatique et le rôle de la .