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| Effects of different rotation modes on the concentrations of soil activate carbon fractions and characteristics of carbon mineralization |
| Received:November 14, 2022 Revised:March 03, 2023 |
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| KeyWord:peanut;rotation modes;dissolved organic carbon;microbial biomass carbon;carbon mineralization |
| Author Name | Affiliation | E-mail | | LIU Xuan | College of Agronomy, Qingdao Agricultural University/Shandong Key Lab. of Dry Farming Techniques, Qingdao 266109, China | | | PANG Ruyue | College of Agronomy, Qingdao Agricultural University/Shandong Key Lab. of Dry Farming Techniques, Qingdao 266109, China | | | ZHAO Jian | Yantai Academy of Agricultural Sciences, Yantai 265500, China | | | SI Tong | College of Agronomy, Qingdao Agricultural University/Shandong Key Lab. of Dry Farming Techniques, Qingdao 266109, China | | | WANG Yuefu | College of Agronomy, Qingdao Agricultural University/Shandong Key Lab. of Dry Farming Techniques, Qingdao 266109, China | | | ZOU Xiaoxia | College of Agronomy, Qingdao Agricultural University/Shandong Key Lab. of Dry Farming Techniques, Qingdao 266109, China | zzouxiaoxia666@126.com | | JIAO Yanlin | Yantai Academy of Agricultural Sciences, Yantai 265500, China | ytpeanut@163.com |
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| Abstract: |
| To assess the effects of various planting modes on soil active carbon pools in field experiments, four rotation modes were applied with continuous cultivation of peanut(Arachis hypogaea Linn.)(CP)as a control. The four rotation modes were as follows:spring peanut → winter wheat(Triticum aestivum L.)- summer maize(Zea mays L.)rotation(P→W-M), winter wheat-summer maize rotation(W-M), winter wheat-summer peanut rotation(W-P), winter wheat-summer peanut → winter wheat-summer maize rotation(W-P→W-M). The concentration of soil organic carbon(SOC) and active carbon fractions such as dissolved organic carbon(DOC) and microbial biomass carbon(MBC), and carbon mineralization characteristics were assessed. The results showed that compared with CP, P→W-M significantly increased the content of SOC(52.7%~53.3%), DOC(13.3%~344.8%), and MBC(25.3%~101.4%). W-P significantly increased the content of SOC in the 0~40 cm soil layers(39.3%~46.8%) and that of DOC(271.4%) and MBC(44.3%)in the 0~20 cm layer. The concentrations of all carbon fractions in the W-P→W-M treatment were significantly decreased. Carbon mineralization in all planting modes was consistent with the first-order dynamic model. Lower potentially mineralized carbon (C0) was found in CP and W-P, while W-M and W-P→W-M significantly increased the value of C0/SOC. In conclusion, P→W-M and W-P can increase the concentration of SOC and active carbon fractions, reduce the potentially mineralized carbon, and improve soil organic carbon sequestration. |
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