Sediment detachment by raindrop impact on grassland and arable fields an investigation of controls

A - Papers appearing in refereed journals

Pulley, S., Morten, C., Morgan, S., Cardenas, L. M. and Collins, A. L. 2021. Sediment detachment by raindrop impact on grassland and arable fields an investigation of controls . Journal of Soils and Sediments. https://doi.org/10.1007/s11368-021-03098-4

AuthorsPulley, S., Morten, C., Morgan, S., Cardenas, L. M. and Collins, A. L.
Abstract

Purpose

Modern agricultural practices have increased the losses of fine sediment and associated pollutants to watercourses with associated off-site degradation of water quality and aquatic biodiversity. Despite significant investment into agri-environment initiatives which aim to reduce these losses, limited empirical mechanistic evidence exists for the efficacy of many on-farm interventions. As the most likely mechanism of particle detachment in many landscapes, understanding the controls for rainsplash erosion is key to generating this mechanistic understanding.
Methods

Soil properties were compared to rainsplash erosion rates on a grassland and an arable field in Southwest England. Soil cores were retrieved and measured for dry density, aggregate stability, vegetation cover, and loss on ignition. A rainsplash erosion trap consisting of a plastic funnel containing filter paper was placed into the hole left by each core, and the mass of sediment trapped over a 1-month and 2-week period was recorded.
Results

Soil compaction on the grassland field was limited to a very small proportion of the total field area at its margins and close to water troughs and was not often associated with a reduction in aggregate stability. Neither soil dry density nor aggregate stability was associated with an increase in rainsplash erosion rate. On arable land, aggregate stability was significantly lower than on the grassland, and rainsplash erosion rates were higher. However, vegetation cover, rather than aggregate stability, was the major controlling factor.
Conclusion

The hypothesis that livestock are not causing an increase in erosion by raindrop impact on grassland fields but the same soils, when cultivated, experience a significant increase in erosion rate can be accepted based on the results generated. In lowland grassland landscapes with recommended best grazing management practices currently implemented, further reductions in sediment losses may therefore not be achievable. However, a reduction in elevated soil loss from arable fields can be achieved by ensuring vegetation cover is present during wet winter months.

KeywordsSplash erosion; Agriculture; Mitigation; Ruminants; Cereals
Year of Publication2021
JournalJournal of Soils and Sediments
Digital Object Identifier (DOI)https://doi.org/10.1007/s11368-021-03098-4
Web address (URL)https://link.springer.com/article/10.1007/s11368-021-03098-4
Open accessPublished as green open access
FunderBiotechnology and Biological Sciences Research Council
European Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
S2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Agritech Cornwall
Accepted author manuscript
Copyright license
CC BY
Output statusPublished
Publication dates
Online08 Nov 2021
Publication process dates
Accepted22 Oct 2021
PublisherSpringer Heidelberg
ISSN1439-0108

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