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Aggregate stability and associated organic carbon and nitrogen as affected by soil erosion and vegetation rehabilitation on the Loess Plateau
Yixia Wang1,2; Lishan Ran4; Nufang Fang1,2; Zhihua Shi2,5; Shi, ZH (reprint author), Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China.; Fang, NF (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationCATENA
ISSN0341-8162
description.correspondentemaillsran@hku.hk ; fnf@ms.iswc.ac.cn ; shizhihua70@gmail.com
Volume167Pages:257-265
AbstractAlthough soil erosion and land use change have long been focuses in carbon research, the combined influence of soil erosion and vegetation rehabilitation on aggregate stability and the associated soil organic carbon (SOC) and total nitrogen (TN) remains unclear. The current study evaluated the effects of soil erosion on aggregate stability and the associated SOC and TN dynamics in relation to vegetation rehabilitation after the implementation of the "Grain-for-Green" project in the hilly Loess region. A check dam sediment sequence was dated using Cs-137 activity and erosive rainfall events. The SOC and TN in the bulk soil and aggregate fractions were measured in soils from rehabilitated grasslands and sloping croplands and in sediments retained by the check dam. The results showed that vegetation rehabilitation led to 78%, 27% and 9% average increases in the macroaggregate amount, mean weight diameter (MWD) and mean geometric diameter (MGD), respectively. In addition, rehabilitation resulted in the highest SOC and TN concentrations and contents in macroaggregates among all the aggregate size fractions. Soil erosion facilitated the modification of the aggregate size distributions along with soil mineralization and induced the incorporation of deeper SOC-poor soils during transport. These processes resulted in the aggregate-associated SOC and TN concentrations and contents in the sediments being significantly lower than those in the eroding sloping cropland soils. The highest reductions were found in micro aggregates, which exhibited decreases of 48% and 44% for SOC and TN, respectively. Moreover, reaggregation and gully soils incorporated during soil erosion led to higher values of macroaggregate amount and aggregate stability at depositional sites than those at eroding sloping cropland sites in this study. Our study contributes to the understanding of the effects of soil erosion and vegetation rehabilitation on SOC and TN dynamics, which is crucial for understanding the restoration efficiency in soil erosion control and ecosystem security evaluation.
KeywordSoil Erosion Land Use Aggregate Check Dam Soil Organic Carbon
Subject AreaGeology ; Agriculture ; Water Resources
DOI10.1016/j.catena.2018.05.005
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000436382700024
PublisherELSEVIER SCIENCE BV
Funding OrganizationNational Key Research and Development Program of China [2016YFC0402401] ; National Key Research and Development Program of China [2016YFC0402401] ; National Natural Science Foundation of China [41671282, 41525003] ; National Natural Science Foundation of China [41671282, 41525003]
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8202
Collection水保所科研产出--SCI_2018--SCI
Corresponding AuthorShi, ZH (reprint author), Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China.; Fang, NF (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Hong Kong, Dept Geog, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
5.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Yixia Wang,Lishan Ran,Nufang Fang,et al. Aggregate stability and associated organic carbon and nitrogen as affected by soil erosion and vegetation rehabilitation on the Loess Plateau[J]. CATENA,2018,167:257-265.
APA Yixia Wang,Lishan Ran,Nufang Fang,Zhihua Shi,Shi, ZH ,&Fang, NF .(2018).Aggregate stability and associated organic carbon and nitrogen as affected by soil erosion and vegetation rehabilitation on the Loess Plateau.CATENA,167,257-265.
MLA Yixia Wang,et al."Aggregate stability and associated organic carbon and nitrogen as affected by soil erosion and vegetation rehabilitation on the Loess Plateau".CATENA 167(2018):257-265.
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