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    曹丽花, 刘合满, 杨红, 连玉珍. 色季拉山急尖长苞冷杉林不同层次土壤CO2浓度及温湿度响应[J]. 北京林业大学学报, 2023, 45(2): 1-10. DOI: 10.12171/j.1000-1522.20220222
    引用本文: 曹丽花, 刘合满, 杨红, 连玉珍. 色季拉山急尖长苞冷杉林不同层次土壤CO2浓度及温湿度响应[J]. 北京林业大学学报, 2023, 45(2): 1-10. DOI: 10.12171/j.1000-1522.20220222
    Cao Lihua, Liu Heman, Yang Hong, Lian Yuzhen. Response of soil CO2 concentration at different depths of Abies georgei var. smithii forest to soil temperature and water content on Sejila Mountain, Tibet of southwestern China[J]. Journal of Beijing Forestry University, 2023, 45(2): 1-10. DOI: 10.12171/j.1000-1522.20220222
    Citation: Cao Lihua, Liu Heman, Yang Hong, Lian Yuzhen. Response of soil CO2 concentration at different depths of Abies georgei var. smithii forest to soil temperature and water content on Sejila Mountain, Tibet of southwestern China[J]. Journal of Beijing Forestry University, 2023, 45(2): 1-10. DOI: 10.12171/j.1000-1522.20220222

    色季拉山急尖长苞冷杉林不同层次土壤CO2浓度及温湿度响应

    Response of soil CO2 concentration at different depths of Abies georgei var. smithii forest to soil temperature and water content on Sejila Mountain, Tibet of southwestern China

    • 摘要:
        目的  揭示西藏高原森林生态系统不同层次土壤CO2浓度变化特征及主要影响因素,为土壤呼吸CO2排放变异性机制提供科学依据。
        方法  以西藏东南部典型森林生态区色季拉山(鲁朗段)为研究区,以急尖长苞冷杉林土壤为研究对象,原位监测不同层次(5、10、20、40和60 cm)土壤CO2浓度,分析不同层次土壤CO2浓度分布特征及对温度和含水量的响应。
        结果  (1)各层次土壤CO2浓度日均值表现为40 cm > 60 cm > 20 cm > 10 cm > 5 cm,平均值分别为5094、4965、4613、4119和3925 μmol/mol,且各层次之间均极显著正相关(P < 0.01)。(2)在日变化尺度上,5 和10 cm层次土壤CO2浓度具有相反的变化特征,分别呈现“V”字型和“单峰型”特征,5 cm土壤CO2浓度最高值和最低值分别出现在22:00—23:00和12:00—13:00之间,10 cm层次分别出现在16:00—17:00和00:00—01:00之间,其他各层CO2浓度日变化特征不明显。(3)不同层次土壤CO2浓度对温度的响应存在一定的延迟效应,而表现出不同的响应曲线,其中表层5和10 cm呈现近似“椭圆”的响应曲线;(4)表层(5和10 cm)土壤CO2浓度主要受含水量的显著影响,而下层(40和60 cm)主要受土壤温度的影响。
        结论  温度和含水量对不同层次土壤CO2浓度具有不同的影响效应,并最终影响土体CO2的传输和动态。

       

      Abstract:
        Objective  This paper aims to elucidate the variation characteristics and main influencing factors of soil CO2 concentration at different depths of the Tibetan Plateau forest ecosystem, so as to provide a scientific basis for variation mechanism of soil respiration CO2 emission.
        Method  We selected Sejila Mountain (Lulang Section) in Tibet of southwestern China as a model area and a typical forest ecological area. Soil temperature (St) and water content (Sw) at different depths (5, 10, 20, 40 and 60 cm) were measured in situ for analyzing the distribution characteristics of soil CO2 concentration at different levels and its response to St and Sw in the Abies georgei var. smithii forest.
        Result  (1) The daily mean value of soil CO2 concentration at all levels was 40 cm > 60 cm > 20 cm > 10 cm > 5 cm, the mean values were 5094, 4965, 4613, 4119 and 3925 μmol/mol, respectively, and there was a significantly positive correlation among different depths. (2) On the diurnal variation scale, soil CO2 concentrations at 5 cm and 10 cm layers had opposite variation characteristics, showing a “V”-shaped and a “single peak” curve, respectively. The peak value and valley value of soil CO2 concentration at 5 cm layer appeared at 22:00−23:00 and 12:00−13:00, respectively, and the 10 cm appeared at 16:00−17:00 and 00:00−01:00, respectively, but no obviously diurnal variation in other layers. (3) The diurnal variations in the soil CO2 concentration were not completely synchronized with the St, and showed a lagged behind changes, showing an approximate ellipse shaped curve in 5 cm and 10 cm layers. (4) The soil CO2 concentration in the surface layer (5 and 10 cm) is mainly affected by water content, while the deeper layer (40 and 60 cm) soil is mainly affected by soil temperature.
        Conclusion  St and Sw have different effects on soil CO2 concentration at different depths, and ultimately affect soil CO2 transport and dynamics.

       

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