Preprints
https://doi.org/10.5194/egusphere-2022-963
https://doi.org/10.5194/egusphere-2022-963
04 Nov 2022
 | 04 Nov 2022

Quantification of the effects of long-term straw return on soil organic matter spatiotemporal variation: A case study in typical black soil region

Yang Yan, Wenjun Ji, Baoguo Li, Guiman Wang, Songchao Chen, Dehai Zhu, and Zhong Liu

Abstract. The straw return practice is essential to soil organic matter (SOM) accumulation in the black soil area with high carbon sequestration potential. However, due to lacking accurate spatial distribution of straw return, few studies took straw return as a variable to carry out rigorous research on the impact of straw return on SOM variation on a regional scale. Based on soil samples and 16 environmental covariates including a 10-meter-resolution straw return amount, the study mapped the spatial distributions of SOM in 2006 and 2018 by random forest (RF) and evaluated the effects of the interaction of soil properties, land use and straw return on SOM spatial-temporal variation. The results show that in the context of the straw returning, the mean SOM content increased from 18.93 g kg−1 to 20.84 g kg−1 during 2006–2018. And 74.49 % of the region had a significant increase (maximum: 24.41 g kg−1) of SOM. The severest SOM loss occurred in the northwest due to the light texture and the transition from paddy fields to dryland. Nevertheless, for areas from paddy fields to dryland, the SOM loss decreased with the increased amount of straw return. The SOM even increased by 1.84 g kg−1 when the straw return amount reached 60–100 %. In addition, soil with higher initial SOM and sand content had a lower response to straw return. The study revealed that straw return is beneficial to carbon sink in farmland and is a better way to prevent a carbon source caused by the change of paddy field to dryland.

Yang Yan et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2022-963', Shuo Li, 05 Dec 2022
  • RC1: 'Comment on egusphere-2022-963', Anonymous Referee #1, 13 Dec 2022
  • RC2: 'Comment on egusphere-2022-963', Anonymous Referee #2, 09 Mar 2023
  • CC2: 'Comment on egusphere-2022-963', Bifeng Hu, 16 Mar 2023

Yang Yan et al.

Yang Yan et al.

Viewed

Total article views: 754 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
542 185 27 754 7 11
  • HTML: 542
  • PDF: 185
  • XML: 27
  • Total: 754
  • BibTeX: 7
  • EndNote: 11
Views and downloads (calculated since 04 Nov 2022)
Cumulative views and downloads (calculated since 04 Nov 2022)

Viewed (geographical distribution)

Total article views: 736 (including HTML, PDF, and XML) Thereof 736 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 21 Mar 2023
Download
Short summary
The response rate of SOM to the amount of straw return was inversely proportional to the initial SOM and the sand contents. From paddy to dry land, the SOM loss decreased with the increased amount of straw return. The SOM even increased by 1.84 g kg−1 when the straw return amount reached 60–100 %. The study revealed that straw return is beneficial to carbon sink in farmland and is a way to prevent a C source caused by the change of paddy field to upland.