[1]Wang Jiamin,Yan Junxia,Liu Ju,et al.Effect of Fertilization and Biochar Addition on Soil Respiration in a Sorghum-Maize Rotation Agroecosystem[J].Research of Soil and Water Conservation,2024,31(05):112-122.[doi:10.13869/j.cnki.rswc.2024.05.006]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 05
Page number:
112-122
Column:
Public date:
2024-08-10
- Title:
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Effect of Fertilization and Biochar Addition on Soil Respiration in a Sorghum-Maize Rotation Agroecosystem
- Author(s):
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Wang Jiamin1, Yan Junxia1, Liu Ju2,3, Wang Yan1
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(1.Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China; 2.Shanxi Academy of Forestry and Grassland Science, Taiyuan 030012, China; 3.Mountain Meadow Ecosystem Observation and Experiment Station in Mount Wutai of Shanxi, Xinzhou, Shanxi 035515, China)
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- Keywords:
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biochar; inorganic fertilizer; soil respiration; soil water and heat factors; hyperspectral vegetation index
- CLC:
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S154
- DOI:
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10.13869/j.cnki.rswc.2024.05.006
- Abstract:
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[Objective]The aims of this study are to explore the effects of fertilization and biochar addition on soil respiration(Rs), environmental factors and vegetation index, and the effects of biotic factors and abiotic factors on soil respiration, and to provide the reference for the assessment of crop growth and carbon emission in farmland ecosystem. [Methods]In a sorghum-corn rotation agroecosystem of Taiyuan basin after a continuous 5-year(2011—2015)fertilization and biochar additon with 4 treatments(control:CK, biochar:B:inorganic fertilizer:INF and inorganic fertilizer+biochar:INF+B), based on periodic observations of Rs, biological and abiotic factors for 2 consecutive years(2015—2016), we analyzed the effects of the 4 treatments on Rs and its relationship with biological and abiotic factors. [Results](1)Compared with CK, B, INF and INF+B reduced soil temperature(2.8%~4.2%), and increased temperature sensitivity(Q10)of soil respiration(4.5%~20.2%)and soil respiration rate(0.5%~8.8%), increased the enhanced vegetation index(EVI)by 1.5%~6.2%, difference vegetation index(DVI)by 0.7%~6.0%, normalized vegetation index(NDVI)by 1.2%~5.4%, respectively; but the influence on these factors did not reach a significant level(p>0.05).(2)The effects of B, INF and INF+B on Rs differed in different growth stages. B, INF and INF+B increased the Rs in the early growth stage, while the Rs of CK treatment was higher than that in other treatments(except B treatment in the grouting stage)(p<0.05)in the later growth stage, resulting in no significant difference in Rs among all treatments in the whole growing stage.(3)Among the three vegetation indices, the seasonal variation of DVI showed the highest interpretation of the seasonal variation in Rs at 75.5%. Soil temperature in 10 cm depth(T10)and soil moisture over 0—10 cm depth(Ws)explained 30.8% and 20.1% of the seasonal variation of Rs, respectively. From the R2 and AIC values, the three-factor model with T10, Ws and DVI as independent variables predicted the seasonal change of Rs well. [Conclusion]There was no significant difference in Rs between the four treatments in whole sorghum, and Rs did not increase by fertilization and biochar addition. The results provided the basis for the relationship between inorganic fertilizer and biochar application on soil carbon emission, soil improvement and crop growth.