کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
89970 159360 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species
چکیده انگلیسی

Net carbon isotope discrimination (13CΔn) in leaves from Thuja plicata, Larix × eurolepis and Picea sitchensis was assessed with the aim of exploring the potential use of leaf carbon isotope signatures as a physiological marker for the selection of shade-tolerant tree species. Leaf 13CΔn varied from 14.2‰ to 26.7‰ depending on incident irradiance and species and was negatively correlated with annual biomass increment. Under shaded conditions, variations in 13CΔn values were consistent with differences in instantaneous nitrogen use efficiency and the ratio of sub-stomatal internal to external CO2 concentration (Ci:Ca). Although changes in 13CΔn were consistent variations in instantaneous photosynthetic discrimination (13CΔi) across all irradiances, we suggest that species-specific variations in Ci:Ca and other isotopic fractionation processes may influence 13CΔn. We demonstrate that 13CΔn can be used to rank species according to shade tolerance (T. plicata > P. sitchensis > L. eurolepis) under shaded conditions only. Therefore, the proposed use of 13CΔn to select shade tolerance should be approached with caution because the ranking of individual species may depend on the light environment to which the material is exposed and what photosynthetic and other metabolic characteristics influence 13CΔn.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 237, Issues 1–3, 15 December 2006, Pages 394–403
نویسندگان
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