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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2021, Vol. 47 Issue (4): 527-533    DOI: 10.3785/j.issn.1008-9209.2020.10.162
Resource utilization & environmental protection     
Influence of rhizosphere priming effects on accumulation and decomposition of soil organic carbon
Chaoyang MO(),Xinlin ZHANG,Jingping YANG()
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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Abstract  

By using a 13C natural abundance method, this study investigated the rhizosphere priming effects (RPE) of sorghum and maize growing in two types of soil (paddy soil and lou soil) at two stages, and the contents of light fraction organic carbon (ρ1＜1.7 g/cm3) and heavy fraction organic carbon (ρ2＞1.7 g/cm3) of soil were also determined. The results showed that planting crops significantly enhanced the soil organic matter decomposition. And the maize induced the most CO2-C flux derived from soil organic carbon at the trumpet stage in paddy soil, which reaching 18.49 mg/(kg?d). The maize induced stronger RPE than sorghum across all growth stages, which indicated that planting maize would bring more CO2 emission. The content of light fraction organic carbon of soil changed significantly, while the content of heavy fraction organic carbon remained stable during RPE process. Hence, RPE may directly function on the light fraction organic carbon. This study provides the theoretical basis for controlling the RPE intensity reasonably and reducing global CO2 fluxes.

Key words： rhizosphere priming effect      soil organic carbon      light fraction organic carbon      heavy fraction organic carbon     
Received: 16 October 2020      Published: 02 September 2021
CLC:  S 154.4  
Corresponding Authors: Jingping YANG     E-mail: 21814098@zju.edu.cn;jpyang@zju.edu.cn
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Chaoyang MO
Xinlin ZHANG
Jingping YANG
Cite this article:

Chaoyang MO,Xinlin ZHANG,Jingping YANG. Influence of rhizosphere priming effects on accumulation and decomposition of soil organic carbon. Journal of Zhejiang University (Agriculture and Life Sciences), 2021, 47(4): 527-533.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2020.10.162     OR     http://www.zjujournals.com/agr/Y2021/V47/I4/527


根际激发效应对土壤有机碳累积及分解的影响

借助13C自然丰度法，通过盆栽实验测试2种植物（玉米、高粱）、2种土壤（水稻土、土）在2个生育期中的根际激发效应以及土壤样品的轻组有机碳（ρ1＜1.7 g/cm3）和重组有机碳（ρ2＞1.7 g/cm3）含量。结果表明：种植作物显著增强了土壤有机质的分解；在水稻土中种植玉米的大喇叭口期，总二氧化碳（CO2）碳通量中来源于土壤的碳最多，达到18.49 mg/（kg?d）。在各个时期，玉米的根际激发效应比高粱的根际激发效应都要强，种植玉米将带来更多的CO2排放。轻组有机碳含量在根际激发效应发生过程中显著改变，而重组有机碳含量则维持稳定。因此，根际激发效应可能直接作用于轻组有机碳。本研究为合理控制根际激发效应强度和降低全球CO2排放量提供了理论基础。


关键词： 根际激发效应,  土壤有机碳,  轻组有机碳,  重组有机碳 

参量

Parameter

水稻土

Paddy soil

小麦土

Lou soil

母质 Parent material新近浅海沉积物 Recent shadow sea sediments黄土 Loess
土壤组成 Soil texture粉砂黏壤土 Silty clay loam粉砂黏壤土 Silty clay loam
黏粒 Clay/%13.1738.90
粉粒 Silt/%49.4442.30
pH5.88.0
总碳 Total C/(g/kg)33.821.7
总氮 Total N/(g/kg)1.50.8
碳氮比 Ratio of C to N22.5327.13
13C丰度值 Abundance of 13C/‰－23.2－24.3
Table 1 Properties of the tested soil
Fig. 1 CO2 trapping system in closed circulation
Fig. 2 CO2-C flux derived from soil organic matter in different treatmentsJS: Jointing stage; PS: Paddy soil; TS: Trumpet stage; LS: Lou soil. Different lowercase letters above bars indicate significant differences among different crops in the same soil during the same stage at the 0.05 probability level.
Fig. 3 Intensity of rhizosphere priming effects in different treatmentsJS: Jointing stage; PS: Paddy soil; TS: Trumpet stage; LS: Lou soil. Different lowercase letters above bars indicate significant differences between different crops in the same soil during the same stage at the 0.05 probability level.
Fig. 4 Contents of light fraction organic carbon of soil in different treatmentsJS: Jointing stage; PS: Paddy soil; TS: Trumpet stage; LS: Lou soil. Different lowercase letters above bars indicate significant differences among different crops in the same soil during the same stage at the 0.05 probability level.
Fig. 5 Contents of heavy fraction organic carbon of soil in different treatmentsJS: Jointing stage; PS: Paddy soil; TS: Trumpet stage; LS: Lou soil. Different lowercase letters above bars indicate significant differences among different crops in the same soil during the same stage at the 0.05 probability level.
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