DOI: 10.1016/j.scitotenv.2019.136150
论文题名: Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall
作者: Yao Y. ; Liu J. ; Wang Z. ; Wei X. ; Zhu H. ; Fu W. ; Shao M.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 709 语种: 英语
英文关键词: Drying
; Enrichment ratio
; Soil texture
; Successive rainfall
; Water-stable aggregate
Scopus关键词: Aggregates
; Drying
; Erosion
; Organic carbon
; Rain
; Textures
; Thunderstorms
; Enrichment ratio
; Erosion characteristics
; Extreme precipitation
; Mean weight diameter
; Organic carbon contents
; Soil aggregate stability
; Soil textures
; Water stable aggregates
; Soils
; nitrogen
; organic carbon
; rain
; erodibility
; extreme event
; nutrient enrichment
; precipitation intensity
; soil aggregate
; soil texture
; spatiotemporal analysis
; stability analysis
; Article
; concentration (parameter)
; correlational study
; nutrient
; priority journal
; runoff
; sediment
; simulation
; soil acidity
; soil aggregation
; soil erosion
; soil texture
英文摘要: Extreme precipitation regime under global change context is estimated to cause heavy rainstorms and longer drought intervals. Temporal variations of soil structure and erosion characteristics during and after heavy rainstorms were less investigated, particularly across a wide soil texture gradient. In this study, 15 soils were selected with clay content ranging in 12.9–38.2%. Soil erosion characteristics and enrichment ratios of organic carbon (EROC) and nitrogen (ERN) were measured during 3 successive rainfall simulations at slope of 15° and intensity of 120 mm h−1. The water-stable aggregate distribution was measured for soils before and after rainfall and drying. The mean weight diameter (MWD) of water-stable aggregate remained unchanged before (1.476 ± 0.182) and after rainfall and drying (1.406 ± 0.135 mm), but decreased for soils with higher organic carbon contents. Soil erodibility (K factor) averaged in 0.018 ± 0.003, 0.011 ± 0.001 and 0.008 ± 0.001 in 3 successive rainfall events, with 42% and 27% decreases after each event, respectively (P < 0.05); and the decreases were greater for less aggregated soils or coarser textured soils. Stepwise regression showed that the <0.25 mm water-stable aggregate explained most variations of K and its dynamics. The EROC and ERN were close to 1 and were not correlated with clay content or MWD (P > 0.05). The ERN decreased first and then remained stable, and EROC was unchanged during successive rainfalls. These results indicated that soil texture or aggregation status affected soil erodibility and its temporal changes in successive rainstorms. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158654
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, 712100, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; School of Land Resources and Urban & Rural Planning, Hebei GEO University, Shijiazhuang, 050031, China; University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Yao Y.,Liu J.,Wang Z.,et al. Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall[J]. Science of the Total Environment,2020-01-01,709