Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest.

ABSTRACT:

Background

Glomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability by altering the distribution of GRSP and SOC in different aggregate fractions remains unknown.

Methods

We used a gradient N addition (0-9 g N m^-2 y^-1) in Pinus tabulaeformis forest for two years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250-53 μm, and fine material: <53 μm) and their relationship with aggregate stability.

Results

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SUBMITTER: Sun L 

PROVIDER: S-EPMC6034158 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature