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水分对苹果园土壤呼吸季节性与年际变化的影响
高胜1, 王蕊1, Salman Ali2, 郭胜利1,2
1.西北农林科技大学 水土保持研究所, 陕西 杨凌 712100;2.西北农林科技大学 资源环境学院, 陕西 杨凌 712100
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。
关键词:  苹果园  土壤呼吸  土壤温度  土壤水分  温度敏感性Q10
DOI:10.13961/j.cnki.stbctb.2019.05.009
分类号:S154.1
基金项目: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
Gao Sheng1, Wang Rui1, Salman Ali2, Guo Shengli1,2
1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;2.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
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.
Key words:  apple orchard  soil respiration  soil temperature  soil moisture  temperature sensitivity of soil respiration(Q10)