IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity
Sun, Shouqin1,2; Lei, Haiqing2,3; Chang, Scott X.2,4
Corresponding AuthorChang, Scott X.(sxchang@ualberta.ca)
2019-04-01
Source PublicationBIOLOGY AND FERTILITY OF SOILS
ISSN0178-2762
Volume55Issue:3Pages:275-283
AbstractClimate change predictions indicate that extreme drought is likely to become more frequent in the future. In this study, the impact of drought on soil respiration (R-s) and its autotrophic (R-a) and heterotrophic components (R-h) were studied in a cultivated Black Chernozemic soil in central Alberta, Canada. The mean R-s was 24.4% lower in the drought relative to the plots with ambient precipitation (P<0.001), with a larger decrease in R-a (26.8%) relative to R-h (21.0%), and a higher (P<0.05) contribution of R-h to R-s under drought (52.8%) than under the ambient condition (47.7%). Both R-s and its R-a and R-h components had an exponential relationship with soil temperature and a quadratic relationship with soil water content. Drought caused a greater decrease in the tipping point of soil water content for R-h (a 39.6% reduction) than for R-a (a 15.1% reduction) relative to the ambient precipitation treatment. In addition, drought resulted in a greater increase in the temperature sensitivity (Q(10) values) of R-a (a 45.0% increase) than that of R-h (a 14.1% increase) relative to the ambient precipitation treatment. The results suggest that drought amplified the water limitation effect on CO2 emission, especially that from microbial respiration, and resulted in a tighter relationship between temperature and root or autotrophic respiration, based on this 1-year study. We conclude that it is important to assess the impact of drought on soil respiration components rather than the total soil respiration, and such differential effects of drought on soil respiration components should be incorporated into global carbon circulation models.
KeywordAutotrophic respiration Drought Heterotrophic respiration Soil respiration Soil water content tipping point Temperature sensitivity of soil respiration (Q(10))
DOI10.1007/s00374-019-01347-w
Indexed BySCI
WOS KeywordCARBON-DIOXIDE ; CO2 EFFLUX ; MICROBIAL CONTRIBUTIONS ; SUMMER DROUGHT ; NITROUS-OXIDE ; WATER-STRESS ; ELEVATED CO2 ; RAIN-FOREST ; STAND AGE ; CLIMATE
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000461142200008
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25300
Collection山地表生过程与生态调控重点实验室
Corresponding AuthorChang, Scott X.
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, 9,Block 4,South Renmin Rd, Chengdu 610041, Sichuan, Peoples R China
2.Univ Alberta, Dept Renewable Resources, 442 Earth Sci Bldg, Edmonton, AB T6G 2E3, Canada
3.Zhejiang Subtrop Crop Res Inst, Wenzhou 325005, Peoples R China
4.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China
Recommended Citation
GB/T 7714
Sun, Shouqin,Lei, Haiqing,Chang, Scott X.. Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity[J]. BIOLOGY AND FERTILITY OF SOILS,2019,55(3):275-283.
APA Sun, Shouqin,Lei, Haiqing,&Chang, Scott X..(2019).Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity.BIOLOGY AND FERTILITY OF SOILS,55(3),275-283.
MLA Sun, Shouqin,et al."Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity".BIOLOGY AND FERTILITY OF SOILS 55.3(2019):275-283.
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