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

Gao Sheng; Wang Rui; Salman Ali; Guo Shengli

doi:10.13961/j.cnki.stbctb.2019.05.009

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

- Impact of Soil Moisture on Seasonal and Annual Variations in Soil Respiration in an Apple Orchard on Loess Plateau Region
- Bulletin of Soiland Water Conservation Vol. 39, Issue 5, Pages: 60-66(2019)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.05.009
  CLC： S154.1
- Published：2019
- 稿件说明：
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Gao Sheng, Wang Rui, Salman Ali, et al. Impact of Soil Moisture on Seasonal and Annual Variations in Soil Respiration in an Apple Orchard on Loess Plateau Region[J]. Bulletin of Soiland Water Conservation, 2019, 39(5): 60-66.
DOI：

Gao Sheng, Wang Rui, Salman Ali, et al. Impact of Soil Moisture on Seasonal and Annual Variations in Soil Respiration in an Apple Orchard on Loess Plateau Region[J]. Bulletin of Soiland Water Conservation, 2019, 39(5): 60-66. DOI： 10.13961/j.cnki.stbctb.2019.05.009.

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/（m

·s），最低值出现在11月后，3 a依次为0.99，0.88，0.69 μmol/（m

·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（Q

）不同，当土壤水分含量

11.12%时，土壤呼吸为2.01 μmol/（m

·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/（m

·s），当土壤含水量>23.63%时，土壤呼吸则为1.38 μmol/（m

·s）；相应地不同水分条件下Q

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Q

，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

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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