The human activities such as combustion of fossil fuels and intensive agriculture, have changed the nitrogen(N) cycle considerably, and have significantly increased the formation and deposition of the reactive N. The increasing deposition of N has exerted much effect on activities of forest ecosystems, such as the alteration of litter production and nutrient concentration of litterfall. In the forest ecosystem, litterfall as the source of soil nutrient and energy plays an important role not only in conserving soil and water and improving the structure and physical鄄chemical properties of soil, but also in maintaining soil fertility, which links the nutrient pool of vegetation and the soil nutrient pool. The annual nutrient input from litterfall is the product of annual litter production and the nutrient concentration of litterfall, which is the major source of soil fertility. Therefore, exploring the influence of nitrogen deposition on totally annual nutrient input from litterfall has the vital significance, while the related report is rare. From November 2007 to December 2010, a simulated nitrogen (N) deposition experiment was conducted in a Pleioblastus amarus plantation in Rainy Area of West China, which was aimed to explore the effect of nitrogen deposition on
Secondary forests are one of the most important fast鄄growth forest types, with a large distribution area and high potential carbon sequestration capacity. In order to investigate the component characteristics of soil organic carbon in a subtropical secondary evergreen broad鄄leaved forest, an experiment was conducted in a typical evergreen broad鄄leaved secondary forest (Castanopsis platyacantha鄄Schima sinensis) in the middle section of Wawushan Mountain, southwest China. The physical soil properties and soil carbon fractions were studied, with the soil profile divided (0-10, 10-40, 40-70 cm and 70-100 cm) and sampled. Results showed that the soil at each level was acidic. Soil potential acidity was between 3.2 and 4.0, field moisture capacity was 63%-190%, and total porosity and bulk density were 63.0%-83.3% and 0.41-0.99 g / cm 3 respectively. Soil pH value and bulk density increased with increased soil depth, while the field moisture capacity and total porosity showed the opposite trend. The organic carbon content of litter was 443 g / kg, and the litter stock and litter carbon stock were 10.4 t / hm 2 and 4.5 t / hm 2 , respectively. Litter organic C stock in the studied forest was higher than in the majority of the plantations and natural forests in Sichuan Province. Soil organic carbon, microbial
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