مقایسهٔ روش‌ها

	لیگنین کلاسون	انقباض چوب	دانسیته‌سنجی پرتو ایکس
حوزه	جنگل‌داری	جنگل‌داری	جنگل‌داری
خانواده	Process / pipeline	Process / pipeline	Process / pipeline
سال پیدایش	1908	1950	2005
پدیدآور	Erik Klason	Carl Skaar	Gabriel Gazo
نوع	chemical analysis	moisture response test	measurement method
منبع بنیادین	TAPPI T222 om-15. (2015). Acid-insoluble lignin in wood and pulp. TAPPI Press.	ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.	Hansmann, C., Wimmer, R., & Gindl, W. (2007). Assessing damage in wood-polymer composites by depth-sensing indentation. Composites Part A, 38(6), 1502–1508.
نام‌های دیگر	acid-insoluble lignin, lignin content	dimensional change, anisotropic shrinkage	wood density, radiography
مرتبط	3	2	3
خلاصه	The Klason lignin method is a standard chemical test for quantifying the acid-insoluble lignin content in wood and plant biomass. Developed by Erik Klason in 1908, the method treats wood with sulfuric acid to dissolve carbohydrates (cellulose and hemicellulose) while leaving the acid-insoluble lignin residue. Klason lignin is widely used in wood science, pulp chemistry, and biomass characterization to assess wood composition and predict properties.	Wood shrinkage is the dimensional change that occurs as wood loses moisture from green (freshly felled) to oven-dry condition. Wood shrinks anisotropically: tangentially (along growth rings) more than radially (from center to edge), and both more than longitudinally (along the grain). Measuring shrinkage percentages is essential for understanding wood drying behavior, predicting checking and warping, and selecting materials for applications sensitive to dimensional change (flooring, cabinetry, musical instruments).	X-ray densitometry is a nondestructive method for measuring wood density, microdensity profiles, and ring-by-ring density variation in wood samples using X-ray image analysis. The method uses attenuation of X-rays passing through wood to quantify mass per unit volume. It enables rapid assessment of wood quality without destroying material, making it valuable for research, timber grading, and genetic selection programs.