《Table 1 Contents of major components of several common organic materials》

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《Review on the Mechanism and Effect of Organic Materials on Available Pb in Soil》

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China is a great country in agriculture with the total area of arable land ranking 4thin the world，and China is rich in organic material resources.The wastes generated during the production and processing of crops，the feces produced by livestock and poultry，and the organic wastes generated by industrial production and residential life are all sources of organic materials.In China，there is an annual output of crops stalks of 500 million t（dry weight），forestry wastes like sawdust，wood shavings of 16 000 t，and livestock and poultry manure of 13.4 billion t，which are increasing at a rate of 5%-10%per year[17].Although China has abundant straw resources，there are still problems such as low utilization rate，low conversion rate，low economic benefit，and serious environmental pollution[18].Appropriate application of organic materials in the soil can not only improve the soil quality，but also reduce the environmental pollution caused by the irrational use of organic materials.Common organic materials include crop stalks，livestock and poultry manure，agricultural production and processing wastes，and domestic sludge.Different organic materials have different components and physical and chemical properties，and the same kind of organic materials also has differences due to different environmental conditions.The main components of common organic materials[19-23]are shown in Table 1.