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dc.contributor.authorLina Ma
dc.contributor.authorShengwen Qi
dc.contributor.authorBowen Zheng
dc.contributor.authorSongfeng Guo
dc.contributor.authorQiangbing Huang
dc.contributor.authorXinbao Yu
dc.date.accessioned2020-07-16T18:42:25Z
dc.date.available2020-07-16T18:42:25Z
dc.date.created2020-07-14 23:34
dc.date.issued2020-07-01
dc.identifieroai:doaj.org/article:baba1a1a34c64d8194b75f76a4de43f7
dc.identifier10.3390/su12145516
dc.identifier2071-1050
dc.identifierhttps://doaj.org/article/baba1a1a34c64d8194b75f76a4de43f7
dc.identifier.urihttp://hdl.handle.net/20.500.12424/3954830
dc.description.abstractA gigantic project named Gully Land Consolidation (GLC) was launched in the hill-gully region of the Chinese Loess Plateau in 2011 to cope with land degradation and create new farmlands for cultivation. However, as a particular kind of remolded loess, the newly created and backfilled farmland may bring new engineering and environmental problems because the soil structure was disturbed and destroyed. In this study, current situations and characteristics of GLC are introduced. Test results show that physical-mechanical properties and microstructural characteristics of backfilled loess of one-year and five-year farmland are significantly affected by the Gully Land Consolidation project. Compared to natural loess, the moisture content, density, and internal friction angle of backfilled loess increase. On the contrary, the porosity, plasticity index, particle size index, and cohesion index decrease. Through SEM tests, it is observed that the particles of backfilled loess are rounded, with large pores filled with crushed fine particles, which results in skeleton strength weakness among particles and pores. The pore size distribution (PSD) of the four types of loess (Q<sub>3</sub> loess, Q<sub>2</sub> loess, one-year farmland, and five-year farmland) was measured using mercury intrusion porosimetry (MIP) tests, showing that the pore size of Q<sub>3</sub> loess is mainly mesopores 4000–20,000 nm in size, accounting for 67.5%. The Q<sub>2</sub>, five-year, and one-year farmland loess have mainly small pores 100–4000 nm in size, accounting for 52.5%, 51.7%, and 71.7%, respectively. The microscopic analysis shows that backfill action degrades the macropores and mesopores into small pores and micropores, leading to weak connection strength among soil particles, which further affects the physical-mechanical properties of loess. The disturbance of backfilled loess leads to an obvious decrease in cohesion and a slight increase in internal friction compared to natural loess. The farming effect becomes prominent with increased backfill time, while the loess soil moisture content increases gradually. Both the cohesion and internal friction of the backfilled loess soil decrease to different degrees. This study is helpful to investigate sustainable land use in the Chinese Loess Plateau and similar areas.
dc.languageEN
dc.publisherMDPI AG
dc.relation.ispartofhttps://www.mdpi.com/2071-1050/12/14/5516
dc.relation.ispartofhttps://doaj.org/toc/2071-1050
dc.sourceSustainability, Vol 12, Iss 5516, p 5516 (2020)
dc.subjectGully Land Consolidation
dc.subjectbackfilled loess
dc.subjectphysical-mechanical property
dc.subjectmicrostructural characteristic
dc.subjectpore size distribution
dc.subjectEnvironmental effects of industries and plants
dc.subjectTD194-195
dc.subjectRenewable energy sources
dc.subjectTJ807-830
dc.subjectEnvironmental sciences
dc.titleFarming Influence on Physical-Mechanical Properties and Microstructural Characteristics of Backfilled Loess Farmland in Yan’an, China
dc.typeArticle
ge.collectioncode2071-1050
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ge.identifier.legacyglobethics:16784327
ge.lastmodificationdate2020-07-14 23:34
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ge.oai.repositoryid52
ge.oai.setnameLCC:Environmental effects of industries and plants
ge.oai.setnameLCC:Renewable energy sources
ge.oai.setnameLCC:Environmental sciences
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ge.linkhttps://doaj.org/article/baba1a1a34c64d8194b75f76a4de43f7


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