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Journal of Soils and Sediments

, Volume 19, Issue 5, pp 2143–2152 | Cite as

Long-term straw mulch effects on crop yields and soil organic carbon fractions at different depths under a no-till system on the Chengdu Plain, China

  • Zijun Zhou
  • Xiangzhong Zeng
  • Kun Chen
  • Zhu Li
  • Song Guo
  • Yuxian Shangguan
  • Hua Yu
  • Shihua Tu
  • Yusheng QinEmail author
Soils, Sec 1 • Soil Organic Matter Dynamics and Nutrient Cycling • Research Article
  • 238 Downloads

Abstract

Proposal

A 12-year field experiment was conducted to assess straw mulch effects on soil organic carbon fractions, the carbon pool management index (CPMI) at different depths, and crop yield under a no-till rice-wheat rotation system on the Chengdu Plain, southwestern China.

Materials and methods

There were two treatments in the experiment: no-till without straw mulch (CK) and no-till with straw mulch (SM). The soil was sampled at 0–5, 5–10, 10–20, and 20–30-cm depths. Soil total organic carbon (TOC), the labile organic carbon fractions, including particulate organic carbon (POC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), and permanganate-oxidizable carbon (KMnO4-C), and the CPMI were analyzed. The crop grains were measured between September 2013 and May 2018.

Results and discussion

Between 2013 and 2018, rice and wheat grain yields under SM were comparable to CK, except there were higher rice yields in 2016 and higher wheat yields in 2017 under SM. The soil organic carbon decreased as soil depth increased in both treatments. Soil TOC, POC, and KMnO4-C concentrations at 0–5 and 5–10 cm, CPMI at 0–5 and 5–10 cm, and DOC at 0–5, 5–10, and 10–20-cm soil depths were significantly greater under SM than under CK, whereas the MBC at 0–5 and 5–10 cm under SM was lower than CK. The POC/TOC, KMnO4-C/TOC, and DOC/TOC ratios were greater under SM in the 0–5 and 5–10 cm, 0–5 cm, and 5–10 and 10–20-cm layers than CK, respectively, whereas the MBC/TOC ratio decreased under SM at 0–5, 5–10, and 10–20-cm depths.

Conclusions

The results showed that straw mulching should be adopted when a no-till rice-wheat cropping system is used in southwestern China because it leads to effective improvements in SOC sequestration while still maintaining normal crop yields.

Keywords

Crop yields No-till Soil carbon fractions Soil different depths Straw mulch 

Notes

Acknowledgements

We thank International Science Editing (http://www.internationalscienceediting.com) for editing this manuscript.

Funding information

This work was financially supported by the National Key R&D Program of China (grant number 2016YFD0300907), the National Natural Science Foundation of China (grant number 41807103), the Special Fund for Agroscientific Research in the Public Interest (grant number 201503118), the Sichuan Science and Technology Program (grant number 2016JY0012), the Youth Foundation of Sichuan Academy of Agricultural Sciences (grant number 2018QNJJ-017), and the Fund for Excellent Papers of Sichuan Academy of Agricultural Sciences (grant number 2018LWJJ-006).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zijun Zhou
    • 1
    • 2
  • Xiangzhong Zeng
    • 1
    • 2
  • Kun Chen
    • 1
    • 2
  • Zhu Li
    • 3
  • Song Guo
    • 1
    • 2
  • Yuxian Shangguan
    • 1
    • 2
  • Hua Yu
    • 1
    • 2
  • Shihua Tu
    • 1
    • 2
  • Yusheng Qin
    • 1
    • 2
    Email author
  1. 1.Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
  2. 2.Monitoring and Experimental Station of Plant Nutrition and Agro-Environment for Sloping Land in South RegionMinistry of Agriculture and Rural AffairsChengduChina
  3. 3.College of ResourcesSichuan Agricultural UniversityChengduChina

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