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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (2): 100-108.DOI: 10.7522/j.issn.1000-694X.2020.00111

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Effects of simulated temperature increase and change of rainfall frequency on soil respiration in arid and semi-arid areas

Dan Han1,2(), Yulin Li1(), Hongling Yang1,2, Zhiying Ning1,2, Ziqian Zhang1,2   

  1. 1.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2020-06-24 Revised:2020-10-19 Online:2021-03-20 Published:2021-03-26
  • Contact: Yulin Li

Abstract:

Temperature and precipitation are important disturbance factors for soil respiration in arid and semi-arid regions. The future increase in temperature and precipitation variability in arid and semi-arid regions caused by global climate change will have an important impact on soil respiration. The study was conducted through the artificial setting of P16×2.5mm, P8×5mm, P4×10mm, P2×20mm and P1×40mm rainfall frequency gradient and OTC temperature increase of about 2 ℃. The study explored the effect of different rainfall frequency and temperature increase treatment on the drought. The influence of soil respiration in arid areas, as well as the relationship between soil respiration and soil temperature and humidity, and its response to changes in rainfall frequency. The results show that: rainfall frequency and warming alone have a very significant effect on soil respiration (P<0.001), but there is no interaction between the two (P>0.5); under a certain rainfall, the soil respiration rate increases with Rainfall frequency decreases and decreases, that is, the soil respiration rate triggered by multi-frequency small rainfall events is greater than that of small-frequency heavy rainfall events; increasing temperature promotes soil respiration and improves soil respiration by about 11%. This result is helpful to predict the impact of changes in rainfall patterns on soil respiration under the background of global warming in arid and semi-arid regions, and also provides reference data for further estimating the carbon budget of the regional ecosystem.

Key words: frequency of rain, warming, soil respiration, semi-arid and arid areas

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