水分对苹果园土壤呼吸季节性与年际变化的影响
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S154.1

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中国博士后科学基金面上项目“不同粒级团聚体中微生物变化及其对土壤呼吸的影响(2018M643755)”;国家自然科学基金面上项目“黄土区植被恢复过程中根系对深层土壤活性有机碳的影响”(41071338)


Impact of Soil Moisture on Seasonal and Annual Variations in Soil Respiration in an Apple Orchard on Loess Plateau Region
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    摘要:

    [目的] 了解果园土壤呼吸的季节和年际变化及其影响因素,为退耕还果条件下黄土高原地区土壤碳源汇功能变化研究提供依据。[方法] 在长武农田生态系统国家野外站,以盛产期果园为对象,利用土壤碳通量监测系统(Li-COR,Lincoln,NE,USA)连续3 a原位监测了土壤呼吸、土壤水分和温度变化,分析了土壤呼吸的季节性和年际间的变化及其与水分、温度变化之间的关系。[结果] 土壤呼吸具有明显的季节和年际变异特征:最高值出现在雨季(7-9月),3 a分别为3.14,3.98,4.71 μmol/(m2·s),最低值出现在11月后,3 a依次为0.99,0.88,0.69 μmol/(m2·s);年际间累积呼吸量变异约21%。土壤呼吸与温度呈显著指数关系,而不同水分状况下土壤呼吸及温度敏感性(Q10)不同,当土壤水分含量<11.12%时,土壤呼吸为2.01 μmol/(m2·s),当土壤含水量变化于11.12%~23.63%之间时,土壤呼吸为2.24 μmol/(m2·s),当土壤含水量>23.63%时,土壤呼吸则为1.38 μmol/(m2·s);相应地不同水分条件下Q10值分别为1.57,1.63和1.38。[结论] 土壤水分显著影响黄土区苹果园土壤呼吸和Q10,研究结果为黄土区果园生态系统碳汇功能的估算提供了依据。

    Abstract:

    [Objective] Identifying the variations in soil respiration and its influencing factors, to provide the basis for evaluating the carbon sequestration resulting from converting cropland to apple orchards on the Loess Plateau.[Methods] A field experiment was conducted in a mature apple orchard at the Changwu State Key Agro-Ecological Station, Shaanxi, China. Soil respiration, soil temperature, and soil moisture (θ) were periodically measured in situ for three years by an automated soil CO2 flux system (Li-COR, Lincoln, NE, USA).[Results] Soil respiration exhibited very significant seasonal and annual variations. The highest values for soil respiration were 3.14, 3.98, and 4.71 μmol/(m2·s), which appeared during the rainy season (July to September); the lowest soil respiration value appeared in November, at 0.99, 0.88, and 0.69 μmol/(m2·s) for three years; and the coefficient of variation for the cumulative soil respiration was 21%. Soil respiration and soil temperature followed an exponential relationship, and the soil moisture significantly influenced the soil respiration and temperature sensitivity of soil respiration(Q10) values. Soil respiration was 2.01 μmol/(m2·s) when θ< 11.12%, while it increased to 2.24 μmol/(m2·s) when θ ranged from 11.12% to 23.63%, and decreased to 1.38 μmol/(m2·s) when θ> 23.63%. The Q10 value was 1.57, 1.63, and 1.38 when θ<11.12%, 11.12%<θ<23.63%, θ> 23.63% at the apple orchard.[Conclusions] Soil moisture significantly influences soil respiration and Q10. This study is useful for estimating the soil carbon sequestration in orchard ecosystems on the semi-arid Loess Plateau.

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高胜,王蕊,Salman Ali,郭胜利.水分对苹果园土壤呼吸季节性与年际变化的影响[J].水土保持通报,2019,39(5):60-66

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  • 收稿日期:2019-05-08
  • 最后修改日期:2019-05-28
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  • 在线发布日期: 2019-11-16
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