| Effects of long\|term straw and plastic film mulching on soil carbon fractions in dryland winter wheat farmland |
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| DOI：10.7606/j.issn.1000-7601.2023.06.12 |
| Key Words: straw mulching plastic film covering soil organic carbon particulate organic carbon potential mineralized carbon microbial biomass carbon |
| Author Name | Affiliation | | XING Wenchao | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | WANG Jun | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | ZHU Shaoqing | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | TAN Guangye | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | WEN Mengmeng | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | DOU Ying | College of Urban and Environment Science, Northwest University, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China |
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| Abstract: |
| Surface mulching with crop straw and plastic film is an effective measure for soil carbon sequestration in dryland cropping systems. However, how soil carbon fractions respond to long term surface mulching is still unclear. Five treatments were set up as straw mulching during growing season at rates of 9 000 kg·hm-2 (HSM) and 4 500 kg·hm-2 (LSM), straw mulching at a rate of 9 000 kg·hm-2 during summer fallow period (FSM), plastic film mulch during growing season (PM), and no mulching control (CK). This study explored the effects of straw mulching and film mulching for 12 a and 13 a on soil organic carbon (SOC), particulate organic carbon (POC), potential carbon mineralization (PCM), and microbial biomass carbon (MBC) under winter wheat in the Loess Plateau of China. Averaged across 2 a, compared to CK, both HSM and LSM increased the contents of all carbon fractions at 0~10 cm, and the contents of SOC, POC, and MBC at 10~20 cm. The proportions of POC and MBC to SOC were also greater in HSM and LSM than CK at 0~20 cm. Both FSM and PM had no effects on soil carbon fractions and their proportions to SOC at all soil layers when compared to CK. Soil carbon fractions were highly correlated with each other. In summary, long term straw mulching during the growing season enhanced carbon fractions in topsoil, and the increased straw mulching rate would help to sequester more carbon into soils. |
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