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Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China
Wang, Zhiqi1,3; Wang, Rui2; Sun, Qiqi1; Du, Lanlan1; Zhao, Man2; Hu, Yaxian1; Guo, Shengli1,2; Guo, SL (reprint author), Inst Soil & Water Conservat, Xinong Rd 26, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2017
Source PublicationECOLOGICAL ENGINEERING
ISSN0925-8574
description.correspondentemailslguo@ms.iswc.ac.cn
Volume105Pages:231-239
AbstractKnowledge of CO2 emissions under different slope gradients and positions and its controlling factors is critical in accurately estimating CO2 emissions and carbon cycling on the slopes of eroded regions. In this study, three east-facing plots of 100 m(2) (20 m x 5 m) with a slope gradient of 0.5 degrees (S-0.5), 1 degrees (S-1), and 3 degrees (S-3) were established in an eroded gully of the semi-arid Loess Plateau, China. The CO2 emission, temperature, moisture, runoff, sediment, fine root biomass and grain yield of these three plots were measured from October 2013 to September 2015 to investigate the relationship between slope gradients and soil CO2 emissions. The results showed that the mean annual cumulative CO2 emissions at Si and S3 (731.0 +/- 65.1 and 628.3 +/- 74.8 gCm(-2) year(-1)) were about 13.4% and 25.5% lower than that at S-0.5 (843.7 +/- 84.9 gC m(-2) year(-1)). The CO2 emissions were higher at bottom slope than at upper slope, with an increase of 26.2% at S-3, 22.9% at S-1 and 14.5% at S-0.5, respectively. The mean soil moisture ranged from 40.8% to 44.8% water-filled pore space (WFPS) among the slope gradients, and from 35.8% to 45.6% WFPS among the slope positions. There was a significant difference in mean fine root biomass among different slope gradients (S-0.5 > S-1 > S-3, P < 0.05), but no significant difference among different slope positions. The mean soil organic carbon (SOC) ranged from 8.8 g kg(-1) at S-3 to 9.9 g kg(-1) at S-0.5, and that at the bottom and middle slope were higher than that at the upper slope at S-1 and S-3. Slope differentiated soil moisture content and redistribution, and the thus derived spatial differences in fine root biomass and crop yields, was the major factor influencing the soil CO2 emissions among slope gradients and positions. Slope gradients and positions should be considered when estimating soil CO2 emissions and carbon cycling in the complex and fragmented topography regions. (C) 2017 Elsevier B.V. All rights reserved.
KeywordCo2 Emissions Runoff Sediment Slope Position Slope Gradient
Subject AreaEnvironmental Sciences & Ecology ; Engineering
DOI10.1016/j.ecoleng.2017.04.050
URL查看原文
Indexed BySCI
Publication PlaceAMSTERDAM
Language英语
WOS IDWOS:000404305300026
PublisherELSEVIER SCIENCE BV
Funding OrganizationNatural Science Foundation of China [41371279]; Fundamental Research Funds of Northwest AF University [Z109021712] ; Natural Science Foundation of China [41371279]; Fundamental Research Funds of Northwest AF University [Z109021712]
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/7956
Collection水保所科研产出--SCI_2017--SCI
Corresponding AuthorGuo, SL (reprint author), Inst Soil & Water Conservat, Xinong Rd 26, Yangling 712100, Shaanxi, Peoples R China.
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Peoples R China
3.North China Univ Water Resources & Elect Power, Sch Resources & Environm, Zhengzhou 450045, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhiqi,Wang, Rui,Sun, Qiqi,et al. Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China[J]. ECOLOGICAL ENGINEERING,2017,105:231-239.
APA Wang, Zhiqi.,Wang, Rui.,Sun, Qiqi.,Du, Lanlan.,Zhao, Man.,...&Guo, SL .(2017).Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China.ECOLOGICAL ENGINEERING,105,231-239.
MLA Wang, Zhiqi,et al."Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China".ECOLOGICAL ENGINEERING 105(2017):231-239.
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