Premium
Relating Intensity of Soil Redistribution to Land Use Changes in Abandoned Pyrenean Fields Using Fallout Caesium‐137
Author(s) -
Navas Ana,
Quine Timothy A,
Walling Des E,
Gaspar Leticia,
Quijano Laura,
Lizaga Iván
Publication year - 2017
Publication title -
land degradation and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 81
eISSN - 1099-145X
pISSN - 1085-3278
DOI - 10.1002/ldr.2724
Subject(s) - redistribution (election) , soil water , environmental science , hydrology (agriculture) , spatial distribution , erosion , soil science , geology , geomorphology , remote sensing , geotechnical engineering , politics , political science , law
Fallout caesium‐137 has been used to trace soil redistribution in abandoned fields located in the Central Spanish Pyrenees. A total of 28 fields with different lengths, slope angles and time since abandonment were selected on a representative south‐facing slope of the Estarrún valley. The local reference inventory and the magnitude and spatial distribution of 137 Cs inventories within these fields were documented and used as a basis for assessing patterns of soil redistribution. The local reference inventory was estimated to be 4,500 Bqm −2 . Within the fields, the average 137 Cs inventory at the top of the slope was 3,920 Bqm −2 , and accumulation of soil at the bottom of the slopes was demonstrated by an average 137 Cs inventory of 5,320 Bqm −2 . Deviations from the reference inventory were highest for fields with the longest slopes that had been abandoned for less than 30 years. Here, increases in the 137 Cs inventory, relative to the reference inventory, in excess of 20% were found at the bottom of the slopes. Considering all the fields and all geomorphic positions within the fields, the greatest 137 Cs losses and gains were found in the fields with the longest duration of abandonment, indicating more intense soil redistribution. Irrespective of the timing of abandonment, the ranges of 137 Cs inventories in the fields were found to be proportional to the water erosion index. The 137 Cs technique demonstrated that patterns of sediment redistribution were closely related to the topographic and physiographic characteristics of the slopes. Copyright © 2017 John Wiley & Sons, Ltd.