Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China

doi:10.1016/j.ecoleng.2017.04.050

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	Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China
	Wang, Zhiqi 1,3; Wang, Rui 2; Sun, Qiqi1 ; Du, Lanlan 1; Zhao, Man 2; Hu, Yaxian 1; Guo, Shengli 1,2; Guo, SL (reprint author), Inst Soil & Water Conservat, Xinong Rd 26, Yangling 712100, Shaanxi, Peoples R China.
刊名	ECOLOGICAL ENGINEERING
	2017
卷号	105 页码:231-239
关键词	Co2 Emissions Runoff Sediment Slope Position Slope Gradient
ISSN号	0925-8574
DOI	10.1016/j.ecoleng.2017.04.050
文献子类	Article
英文摘要	Knowledge 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.
学科主题	Environmental Sciences & Ecology ; Engineering
URL标识	查看原文
出版地	AMSTERDAM
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000404305300026
资助机构	Natural 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] ; Natural 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]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7956]
专题	水保所科研产出--SCI_2017--SCI
通讯作者	Guo, SL (reprint author), Inst Soil & Water Conservat, Xinong Rd 26, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.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
推荐引用方式 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.