| 引用本文: | 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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| 摘要: |
| 摘要：【目的】探讨不同灌水下限设施土壤CO2排放特征及其影响因素，为调控设施土壤水分和碳排放提供理论依据。【方法】在番茄生育期内采用LI-8100A土壤碳通量自动测定仪观测不同灌水下限[20 kPa（D20）、30 kPa（D30）、40 kPa（D40）]下的土壤CO2排放速率，并分析其影响因素。【结果】在番茄生育期内，不同灌水下限设施土壤CO2排放速率变化趋势基本一致，D20处理最高，平均速率为2.759 μmol/（m2?s），其次是D30处理，为2.601 μmol/（m2?s），D40处理最低，为2.559 μmol/（m2?s）。在土壤CO2累积排放量方面，D20处理显著高于其他两个处理，而D30和D40处理之间无显著差异。就单因素模型而言，不同灌水下限处理的土壤CO2排放速率与15 cm土壤温度呈指数回归关系，且均达显著水平（P<0.05）；不同灌水下限处理的土壤CO2排放速率与15 cm土壤含水量均呈显著性二次回归关系（P<0.05）；与单因素模型相比，土壤温度和土壤含水量的双因素复合模型（68.5%~83.8%）可以更好地解释土壤CO2排放的变化。土壤温度敏感系数Q10值在1.442~1.498之间，其中D20处理最敏感，D40处理最不敏感。相关分析结果表明，土壤CO2累积排放量与0~20 cm土层土壤有机质、pH、全氮、速效磷、速效钾、碱解氮和微生物量碳呈显著相关关系。采用PCA分析提取出的2个主成分累积贡献率为85.79%。【结论】灌水下限影响设施土壤CO2的排放，其中D20处理促进了设施土壤CO2的排放。 |
| 关键词: 灌水下限;土壤CO[sub_s]2[sub_e]排放;土壤温度;土壤含水量；土壤温度敏感系数（Q10） |
| DOI： |
| 分类号:S157;S161.9 |
| 基金项目:国家科技支撑项目(2015BAD23B0203)；辽宁省设施蔬菜创新团队项目；辽宁省“百千万人才工程”；辽宁省高等学校创新人才支持项目作者简介韩昌东(1994-),男,辽宁大连人,硕士研究生,从事农业节水及土壤碳排放研究。E-mailChangdongHan678@126.com通信作者邹洪涛(1975-),男,辽宁营口人,教授,主要从事土壤改良与农业节水研究。E-mail:zouhongtao2001@163.com |
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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) |
