Characteristics of soil organic nitrogen fractions under vegetation restoration in karst areas.

ABSTRACT: To understand the characteristics of soil organic nitrogen fractions under vegetation restoration in karst areas, soil samples from grassland (5-year-old), shrub-grassland (15-year-old), shrubland (20-year-old) and forestland (40-year-old) were taken as the research objects. The Bremner acid-hydrolysis method was used to determine the soil nitrogen fractions, and the correlations between them and soil physical and chemical properties were analyzed. The results showed that with the increase of soil depth, the mass fractions of soil total nitrogen (TN), non-acid-hydrolyzable nitrogen (AIN), acid-hydrolyzable nitrogen (TAN) and their various components all showed a downward trend. The mass fractions of various organic nitrogen components and their proportions in TN from large to small were as

SUBMITTER: Shu Y 

PROVIDER: S-EPMC12317007 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature