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
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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.
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.
KeywordsCrop yields No-till Soil carbon fractions Soil different depths Straw mulch
We thank International Science Editing (http://www.internationalscienceediting.com) for editing this manuscript.
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).
- Kassam A, Li HW, Niino Y, Friedrich T, Jin H, Wang XL (2014) Current status, prospect and policy and institutional support for conservation agriculture in the Asia-Pacific region. Int J Agric Biol Eng 7:1–13Google Scholar
- Lafond GP (1994) Effects off row spacing, seeding rate and nitrogen on yield of barley and wheat under zero-till management. Can J Soil Sci 74:703–711Google Scholar
- Lu RK (2000) Methods of soil and agro-chemistry analysis. China Agricultural Science and Technology Press, Beijing, pp 62–141Google Scholar
- Lynd LR, Wyman CE, Gerngross TU (1999) Biocommodity engineering. Biotechnol Prog 15:777–793Google Scholar
- Nayak AK, Gangwar B, Shukla AK, Mazumdar SP, Kumar A, Kumar V, Rai PK, Mohan U (2012) Long-term effect of different integrated nutrient management on soil organic carbon and its fractions and sustainability of rice-wheat system in indo Gangetic Plains of India. Field Crops Res 127:129–139CrossRefGoogle Scholar
- Sinclair TR, Amir J (1996) Model analysis of a straw mulch system for continuous wheat in an arid climate. Field Crops Res 47:33–41Google Scholar
- Singh P, Heikkinen J, Ketoja E, Nuutinen V, Palojärvi A, Sheehy J, Esala M, Mitra S, Alakukku L, Regina K (2015) Tillage and crop residue management methods had minor effects on the stock and stabilization of topsoil carbon in a 30-year field experiment. Sci Total Environ 337:518–519Google Scholar
- Smith P, Martino D, Cai Z, Gwary D, Janzen H, Kumar P, McCarl B, Ogle S, O’Mara F, Rice C, Scholes B, Sirotenko O, Howden M, McAllister T, Pan G, Romanenkov V, Schneider U, Towprayoon S, Wattenbach M, Smith J (2008) Greenhouse gas mitigation in agriculture. Philos Trans R Soc B 363:789–813CrossRefGoogle Scholar
- Vieira FCB, Bayer C, Zanatta JA, Dieckow J, Mielniczuk J, He ZL (2007) Carbon management index based on physical fractionation of soil organic matter in an Acrisol under long-term no-till cropping systems. Soil Tillage Res 96:195–204Google Scholar
- Wang XB, Wu HJ, Dai K, Zhang DC, Feng ZH, Zhao QS, Wu XP, Ke J, Cai DX, Oenema O, Hoogmoed WB (2012) Tillage and crop residue effects on rainfed wheat and maize production in northern China. Field Crops Res 132:106–116Google Scholar
- Wang J, Xue Y, Pan JJ, Zheng XQ, Qin Q, Sun LJ, Song K (2018) Effects of tillage and straw incorporation on sequestration of organic carbon and crop yields. J Soil Water Conserv 5:121–127 (in Chinese)Google Scholar
- Zhao X, Liu SL, Pu C, Zhang XQ, Xue JF, Ren YX, Zhao XL, Chen F, Lal R, Zhang HL (2017) Crop yields under no-till farming in China: a meta-analysis. Eur J Agron 84:67–75Google Scholar
- Zhao YC, Wang MY, Hu SJ, Zhang XD, Ouyang Z, Zhang GL, Huang B, Zhao SW, Wu JS, Xie DT, Zhu B, Yu DS, Pan XZ, Xu SX, Shi XZ (2018) Economics- and policy-driven organic carbon input enhancement dominates soil organic carbon accumulation in Chinese croplands. Proc Natl Acad Sci U S A 115:4045–4050CrossRefGoogle Scholar