| Cite this article: | 韩昌东,叶旭红,马玲,等.不同灌水下限设施土壤CO2排放特征及其影响因素的研究[J].灌溉排水学报,2020,():-. |
| Han Changdong,Ye Xuhong,Ma Ling,et al.不同灌水下限设施土壤CO2排放特征及其影响因素的研究[J].灌溉排水学报,2020,():-. |
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| The characteristics of soil CO2 emission and its impact factors of greenhouse soil under different controlled irrigation low limits |
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Han Changdong, Ye Xuhong, Ma Ling, Ma Jianhui, Zou Hongtao, Zhang Yulong
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College of Land and Environment,Shenyang Agricultural University/Key Laboratory of Arable Land Conservation Northeast China ,Ministry of Agriculture/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources
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| Abstract: |
| Abstract :【Objective】 In order to provide theoretical basis for regulating soil moisture and CO2 emission, the dynamic changes of soil CO2 emission and its impact factors of greenhouse soil under different controlled irrigation low limits are investigated.【Method】During growth periods of tomato, adopting LI-8100A automatic determination of soil carbon flux, soil CO2 emission rate and environment factors under 3 controlled irrigation low limits (D20，D30，D40 ) were observed.【Result】The results showed that soil CO2 emission rates under different controlled irrigation low limits were found to have similar variability, during growth periods of tomato. Mean soil CO2 emission rate was the highest in the D20 treatment (2.759 μmol/(m2?s)), followed by D30 treatment (2.601 μmol/(m2?s)) and the lowest is D40 treatment (2.559 μmol/(m2?s)). The total amount of soil CO2 emission in the D20 treatment was significantly higher than the other two treatment, while D30 and D40 treatments had no significant difference. The relationship between soil CO2 emission and soil temperature at 15cm depth under different controlled irrigation low limits was explained by exponential functions (P<0.05). The relationship between soil CO2 emission and soil water content at 15cm depth (P<0.05) under different controlled irrigation low limits was explained by quadratic curve functions. Compared with the single factor model, the changes of soil CO2 emission was better explained by the two-factor model of soil temperature and soil water content (P<0.01, R2=0.685~0.838). The temperature sensitivity coefficient (Q10) of soil CO2 emission was 1.442~1.498. The most temperature sensitive treatment was the D20 treatment, while the least sensitive was the D40 treatment. According to the research by the method of correlation analysis, the relationship between the total amount of soil CO2 emission and soil organic matter, pH, total nitrogen, available P, available K, available N, microbial biomass carbon was significantly correlated. The cumulative contribution rate of the two principal components extracted by PCA analysis was 85.79%.【Conclusion】The CO2 emission of greenhouse soil is affected by controlled irrigation low limits , and the CO2 emission of greenhouse soil is promoted by theD20 treatment . |
| Key words: Controlled irrigation low limits; Soil CO2 emission; Soil temperature; Soil water content；The temperature sensitivity coefficient (Q10) |
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