NDLI: Structural stability changes in a grazed grassland natraquoll of the Flooding Pampa (Argentina)

Content Provider	Springer Nature Link
Author	Taboada, Miguel A. Lavado, Raúl S. Svartz, Héctor Segat, Andrea M. L.
Copyright Year	1999
Abstract	Several factors affecting soil structural stability interact in the natural grasslands of the Flooding Pampa (Argentina). This seasonal and flat wetland (usually ponded in winter-spring and dry in summer) has swelling soils, which are affected by seasonal increases in sodium, and continuous grazing by cattle. Our study aimed to determine the period of structural deterioration, the magnitude of deterioration, and the time for recovery in a widely distributed soil of the region. The mean weight diameter of wet-sieved aggregates (MWD) was determined in grazed and ungrazed (exclosure) plots. Aggregate MWD was often lower in the soil under grazing (from 4.4 to 5.1 mm) than in that of the exclosed area (from 4.7 to 5.4 mm). This reduction in aggregate size was attributable to the mechanical shearing action of trampling. Soil water content accounted for 74% of the variation in aggregate MWD under grazing. At low soil water contents, the structure of the grazed soil became less stable. Grazing effects on soil structural stability are significant only in periods when the soil dries. Stocking rates must be regulated at those dry periods.
Starting Page	50
Ending Page	55
Page Count	6
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	19
Issue Number	1
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	1999-01-01
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	soil structural stability ponding cattle grazing grasslands Flooding Pampa Freshwater & Marine Ecology Environmental Management Ecology Hydrogeology Coastal Sciences Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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