关键词: 叶倾角分布, 椭球分布, 大兴安岭, 定量遥感

Abstract: Acid deposition has been a severe environmental pollution problem in Mt. Lushan since early 1980, Soil acidification trends have been resultantly obvious. Pedons of the Typic Udalfs both under deciduous and coniferous forest with and without root-growing effects were sampled. Soil sulfur was fractionated by selective extraction methods and the sulfur in solutions was determined by BaSO₄ turbidimetry. The results showed the total S in surface layers amounted to 400-800mg穔g^-1 , indicating a high net accumulation of S under impacts of the acid deposition. The sulfur in the soils were predominated by adsorbed sulfur(160.0?72 1mg穔g^-1 ) and organic sulfur(123.3?142.9 mg穔g^-1 ), with the former accumulating to deep profile and the latter in surface 0-30 cm depth. Under deciduous soil sulfur accumulated to deep profile. Adsorbed sulfur under coniferous was higher (152.72 mg穔g^-1 ) than which under deciduous (121.85 mg穔g^-1 ), while the latter contained more water sulfur, indicating sulfur under deciduous inclined to move. Soils with root-growing effects contained more total sulfur (351.15 mg穔g^-1 ) than soil without root-growing effects ( 300.50 mg穔g^-1), high organic sulfur accumulated in soils in root-growing depth, but no significant profile difference under deciduous. Therefore, the sulfur transform was involved in accumulation of sulfur affected by acid deposition.

Key words: leaf inclination angle distribution, ellipsoid distribution, Daxing’an Mountains, quantitative remote sensing.