کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
85785 159123 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relationship of strontium and calcium concentrations with the parameters of cell structure in Siberian spruce and fir tree-rings
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Relationship of strontium and calcium concentrations with the parameters of cell structure in Siberian spruce and fir tree-rings
چکیده انگلیسی

This study addressed distribution of calcium and strontium in Siberian spruce (Picea obovata Ledeb.) and Siberian fir (Abies sibirica Ledeb.) tree-rings and its dependence on these woody species cell structure. Calcium concentration was found to decrease gradually from earlywood to latewood, whereas strontium showed an opposite trend. However, their trends at the scale of several rings are co-directed in the samples analyzed. A strong linear relationship was identified between the distribution of Sr/Ca concentration ratio and tree-ring density profile for both woody species. Radiographic density of Siberian spruce tree-ring cell walls and Ca and Sr concentrations in them were determined to have negative correlation with cell wall thickness. In earlywood of annual rings of a spruce the radiographic density of cell wall reaches 2.0 g/cm3 and decreases to 1.2 g/cm3 in latewood. The hypothesis put forward in this study to explain these strontium and calcium distributions in the tree-rings is that the concentrations of the element ions change with development of different cell wall layers. The high value of radiographic density of a cellular wall in earlywood and its relationship with cell wall thickness can be explained by the presence of ions of calcium in a cellular wall. Ions of calcium absorb X-ray radiation more strongly in comparison with light chemical elements. It can become the reason of observable relationship between radiographic density of cell wall and cell wall thickness.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dendrochronologia - Volume 30, Issue 2, 2012, Pages 189–194
نویسندگان
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