Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities,Ecohydrology

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Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities
Ecohydrology ( IF 2.5 ) Pub Date : 2021-07-06 , DOI: 10.1002/eco.2326
He Zhang ₁ , Peifeng Xiong ₂ , Zhao Jia ₁ , Junjie Zhou ₁ , Furong Niu ₃ , Bingcheng Xu _{1,

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Climate change is increasing the extreme precipitation depth and frequency, which may cause a strong response of ecological processes in drought regions. To investigate how rainfall depth and frequency alter soil respiration (SR), a rainfall simulation experiment was conducted in grassland communities dominated by Artemisia gmelinii and Lespedeza davurica in Loess Plateau of China. SR rate (R_s), soil temperature (T_s) and soil volumetric water content (S_v) were monitored before and after the rainfall treatments, that is, four depths (5, 10, 20 and 40 mm) and three frequencies (40 mm × 1, 20 mm × 2 and 10 mm × 4) during the growing season (June to September). Results indicated that the response magnitude of R_s increased with rainfall depths, reaching the maximum under 40 mm, and the increments were tightly related to rainfall frequency and community type. The increase and mean value of R_s in A. gmelinii community were significantly higher than those in L. davurica and bare land under same rainfall depth. L. davurica community was more sensitive to rainfall lower than 10 mm, whereas it had weaker but longer response under rainfall larger than 10 mm compared with A. gmelinii community. Successive rainfall events dampened the pulse effect of R_s but generated more cumulative CO₂ emission in vegetation communities. T_s and S_v varied significantly with rainfall depth and co-regulated SR. These findings implied more CO₂ will be released from soil in the semiarid grasslands under extreme and successive rainfalls and emphasized the importance of species impact on SR for soil carbon evaluation under future rainfall regimes.

更新日期：2021-07-06

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