ISWC OpenIR  > 水保所2018--届毕业生论文
Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau
Qiqi Sun1,3; Rui Wang4; Yaxian Hu1,4; Lunguang Yao2; Shengli Guo1,2,4
2018-04
Source PublicationPlos One
description.correspondentemailslguo@ms.iswc.ac.cn
Volume13Issue:4Pages:e0195400
AbstractSpatial heterogeneity of soil respiration and its temperature sensitivity poses great challenge to accurately estimating carbon flux in global carbon cycling, which have been researched mostly on flatlands but few in hillslope ecosystems. On an eroded slope (35°) of the semiarid Loess Plateau, soil respiration, soil moisture and soil temperature were in situ measured at upper and lower slope positions in triplicates from 2014 till 2016, with soil biochemical and microbial properties also being measured. Results showed that soil respiration was significantly greater (by 44.2%) at lower slope position (2.6 μmol m–2 s–1) than at upper slope position, so were soil moisture, carbon, nitrogen fractions and root biomass. However, the temperature sensitivity did oppositely by 13.2%. Soil fungal community changed from being Basidiomycota-dominant at upper slope position to being Zygomycota-dominant at lower slope position, corresponding with greater β-D-glucosidase activity at upper- than at lower- slope position. We concluded that soil respiration was enhanced by erosion-induced greater soil moisture, root biomass and carbon, nitrogen contents at lower- than at upper- slope position. Moreover, the greater soil respiration and lower temperature sensitivity at lower slope position was a product partly of copiotrophs replacing oligotrophs. Such spatial variations along slopes must be properly accounted for when estimating the carbon budget and feedback of future climate changes to hillslope ecosystems.
DOIhttps://doi.org/10.1371/journal. pone.0195400
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8169
Collection水保所2018--届毕业生论文
Corresponding AuthorShengli Guo
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shannxi, China
2.Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University
3.University of Chinese Academy of Sciences, Beijing, China
4.College of Resources and Environment, Northwest A&F University, Yangling, Shannxi, China
Recommended Citation
GB/T 7714
Qiqi Sun,Rui Wang,Yaxian Hu,et al. Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau[J]. Plos One,2018,13(4):e0195400.
APA Qiqi Sun,Rui Wang,Yaxian Hu,Lunguang Yao,&Shengli Guo.(2018).Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau.Plos One,13(4),e0195400.
MLA Qiqi Sun,et al."Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau".Plos One 13.4(2018):e0195400.
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