Climate change is increasing the extreme precipitation depth and frequency, which
may cause a strong response of ecological processes in drought regions. To investi-
gate 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 rain-
fall 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 damp-
ened the pulse effect of R s but generated more cumulative CO 2 emission in vegeta-
tion communities. T s and S v varied significantly with rainfall depth and co-regulated
SR. These findings implied more CO 2 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.
1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University 2.College of Resources and Environment, Anhui Agricultural University
推荐引用方式 GB/T 7714
He Zhang,Peifeng Xiong,Zhao Jia. Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities[J]. R E S E A R C H A R T I C L E,2021,14(7):1-15.
APA
He Zhang,Peifeng Xiong,&Zhao Jia.(2021).Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities.R E S E A R C H A R T I C L E,14(7),1-15.
MLA
He Zhang,et al."Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities".R E S E A R C H A R T I C L E 14.7(2021):1-15.
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