Soil carbon mineralization in response to nitrogen enrichment in surface and subsurface layers in two land use types

Nazia Perveen, Mariam Ayub, Tanvir Shahzad, Muhammad Rashid Siddiq, Muhammad Sohail Memon, Sébastien Barot, Hamid Saeed, Ming Xu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Atmospheric nitrogen (N) deposition increases N availability in soils, with consequences affecting the decomposition of soil carbon (C). The impacts of increasing N availability on surface soil C dynamics are well studied. However, subsurface soils have been paid less attention although more than 50% soil C stock is present below this depth (below 20 cm). This study was designed to investigate the response of surface (0-20 cm) and subsurface (20-40 cm and 40-60 cm) C dynamics to 0 (0 kg N ha-1), low (70 kg N ha-1) and high (120 kg N ha-1) levels of N enrichment. The soils were sampled from a cropland and a grass lawn and incubated at 25 °C and 60% water holding capacity for 45 days. Results showed thatNenrichment significantly decreased soil C mineralization (Rs) in all the three soil layers in the two studied sites (p<0:05). The mineralization per unit soil organic carbon (SOC) increased with profile depth in both soils, indicating the higher decomposability of soil C down the soil profile. Moreover, highNlevel exhibited stronger suppression effect on Rs than low N level. Rs was significantly and positively correlated with microbial biomass carbon explaining 80% of variation in Rs. Overall; these results suggest that N enrichment may increase C sequestration both in surface and subsurface layers, by reducing C loss through mineralization.

Original languageEnglish (US)
Article number7130
JournalPeerJ
Volume2019
Issue number7
DOIs
StatePublished - 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Keywords

  • C sequestration
  • Land use types
  • Nitrogen enrichment
  • Soil c mineralization
  • Subsurface soil C

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