Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall
Yao, Yufei1,2,5; Liu, Jiao1; Wang, Zhao1; Wei, Xiaorong1,2,3; Zhu, Hansong1; Fu, Wei4; Shao, Mingan1,2,3
2020-03
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
description.correspondentemailxrwei78@163.com
Issue709Pages:136150
Abstract

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 12.938.2%. 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 120mm 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.

KeywordSoil texture Water-stable aggregate Enrichment ratio Successive rainfall Drying
DOI10.1016/j.scitotenv.2019.136150
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/9234
Collection水保所2018--2020届毕业生论文(学位论文、期刊论文)
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University
2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry ofWater Resources
3.CAS Center for Excellence in Quaternary Science and Global Change
4.School of Land Resources and Urban & Rural Planning, Hebei GEO University
5.University of Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yao, Yufei,Liu, Jiao,Wang, Zhao,et al. Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020(709):136150.
APA Yao, Yufei.,Liu, Jiao.,Wang, Zhao.,Wei, Xiaorong.,Zhu, Hansong.,...&Shao, Mingan.(2020).Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall.SCIENCE OF THE TOTAL ENVIRONMENT(709),136150.
MLA Yao, Yufei,et al."Responses of soil aggregate stability, erodibility and nutrient enrichment to simulated extreme heavy rainfall".SCIENCE OF THE TOTAL ENVIRONMENT .709(2020):136150.
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