Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau

doi:https://doi.org/10.1371/journal. pone.0195400

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	Spatial variations of soil respiration and temperature sensitivity along a steep slope of the semiarid Loess Plateau
	Qiqi Sun2,4 ; Yaxian Hu 1,4; Lunguang Yao 3; Shengli Guo 1,3,4; Rui Wang 1
刊名	Plos One
	2018-04
卷号	13 期号:4 页码:e0195400
DOI	https://doi.org/10.1371/journal. pone.0195400
英文摘要	Spatial 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.
会议日期	2017年8月
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/8169]
专题	水保所2018届毕业生论文
通讯作者	Shengli Guo
作者单位	1.College of Resources and Environment, Northwest A&F University, Yangling, Shannxi, China 2.University of Chinese Academy of Sciences, Beijing, China 3.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 4.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
推荐引用方式 GB/T 7714	Qiqi Sun,Yaxian Hu,Lunguang Yao,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,Yaxian Hu,Lunguang Yao,Shengli Guo,&Rui Wang.(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.