Leaching is the dominant route for soil organic carbon lateral transport under crop straw addition on sloping croplands

Keke Hua and Bo Zhu
Additional contact information
Keke Hua: Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu, P.R. China
Bo Zhu: Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu, P.R. China

Plant, Soil and Environment, 2018, vol. 64, issue 7, 344-351

Abstract: Few field data sets are available that systematically measure soil organic carbon (SOC) transport via surface runoff, leaching and soil erosion under crop straw applications. Therefore, organic carbon (C) loss fluxes via the three routes were simultaneously observed from 2010 to 2012 based on a crop straw addition experiment. This study included three treatments: CK (no fertilizer); RSD (crop straw addition) and RSDNPK (crop straw addition combined with mineral fertilizers). As compared with CK treatment, annual dissolved organic C (DOC) loss caused by surface runoff under RSD and RSDNPK treatments decreased significantly (P < 0.05) by 302.8% and 294.2%. Similarly, corresponding organic C loss caused by soil erosion reduced sharply by 638.8% and 1227.3%. In contrast, corresponding annual DOC leaching fluxes increased significantly (P < 0.05) by 133.3% and 109.3%. Overall, the total fluxes of SOC transport under RSD and RSDNPK treatments decreased significantly (P < 0.05) by 132.3% and 184.1% compared with CK treatment (4975.7 ± 1207.8 mg/m2). DOC leaching accounted for 70% and 77% of SOC transport under RSD and RSDNPK treatments. These results clearly show that leaching is the dominant route of SOC lateral transport under crop straw applications. Therefore, reduced DOC leaching is the crucial link to enhance SOC sequestration when crop straw is returned to sloping croplands.

Keywords: hydrology route; dissolved organic carbon loss; crop straw returned; fertilization experiment; hillslopes (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://pse.agriculturejournals.cz/doi/10.17221/139/2018-PSE.html (text/html)
http://pse.agriculturejournals.cz/doi/10.17221/139/2018-PSE.pdf (application/pdf)
free of charge

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:64:y:2018:i:7:id:139-2018-pse

DOI: 10.17221/139/2018-PSE

Access Statistics for this article

Plant, Soil and Environment is currently edited by Kateřina Součková

More articles in Plant, Soil and Environment from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().