title: [Vertical Distribution Characteristics of Typical Forest Soil Organic Nitrogen in Dawei Mountain].
abstract: To clarify altitudinal gradient of subtropical forest soil total nitrogen and organic nitrogen, soil samples were collected per 10 cm on soil profile (0-100 cm) in Dawei Mountain, researched the variation of soil organic nitrogen and correlation with soil physical and chemical properties. The results showed that: (1) Total nitrogen, acid hydrolysable organic nitrogen and soluble organic nitrogen decreased with the increase of depth, content of each component in mountain granite yellow-brown soils was much higher affected by altitude; (2) The average percentage of soil organic nitrogen to total nitrogen was 97.39% ± 1.17%, and soil acid hydrolysable organic nitrogen was 64.38% ± 10.68%, each component decreased with the increase of soil depth; (3) Soil soluble organic nitrogen content was 9.92- 23.45 mg x kg(-1), free amino acids (1.62 - 12.02 mg x kg(-1)) accounted for about 27.36% ± 9.95% of soluble organic nitrogen; (4) Soil acid hydrolysable organic nitrogen and soluble organic nitrogen were significantly positively correlated with total nitrogen, total soluble nitrogen and inorganic nitrogen (P < 0.05), were highly significantly correlated with soil bulk density, organic carbon, and total phosphorus (P < 0.01). Organic nitrogen was the main body of soil nitrogen in typical subtropical forest, each component showed a downward trend increase with soil depth affected by altitude and soil physical and chemical properties. There was a close conversion relationship between soil organic nitrogen and other nitrogen forms, the characteristics of soil organic nitrogen will have profound impact on nitrogen cycling of forest ecological system.
authors: Xian-qing
authors: XQ
authors: Ding
authors: Hui-jing
authors: HJ
authors: Ma
authors: Xiao-long
authors: XL
authors: Zhu
authors: Shan
authors: S
authors: Chen
authors: Hong-bo
authors: HB
authors: Hou
authors: Pei-qin
authors: PQ
authors: Peng
mesh_terms: D000531:Altitude; D002681:China; D065928:Forests; D009584:Nitrogen / Q000032:analysis*; D058458:Nitrogen Cycle; D009930:Organic Chemicals / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012987:Soil / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen