Abstract
Background and aims
Our objective was to assess the effects of long-term continuous grazing on soil enzyme activities in relation to shifts in plant litter attributes and soil resources in an arid ecosystem, considering both spatial and temporal variations.
Methods
We randomly extracted soil samples with the respective litter cover at 5 modal size plant-covered patches (PCP) and the nearest inter-canopy areas (IC) at Patagonian Monte sites with low, medium and high grazing intensity in winter and summer from 2007 to 2009. We analyzed enzyme activities (dehydrogenase, ß-glucosidase, protease, alkaline and acid phosphatase), microbial biomass-C, organic-C, total soil-N, and moisture in soil and mass and quality in plant litter. We assessed faeces density and plant cover in the field.
Results and conclusions
Grazing led to reduced grass cover, decreasing plant litter mass with increasing soluble phenolics, and reduced phosphatases, ß-glucosidase and microbial biomass-C at PCP. A localized nutrient input from animal excreta seems to promote microbial biomass-C, alkaline phosphatase and dehydrogenase activities but only at IC from the site with high grazing intensity. Plant heterogeneous distribution, plant litter quantity and quality, nutrient inputs from grazers and seasonal variation in soil moisture, also affecting soil resources and microbial biomass, modulate soil enzyme responses to long-term grazing in the arid Patagonian Monte.
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Abbreviations
- PCP:
-
Modal size plant-covered patches
- IC:
-
Inter-canopy areas
- L:
-
Low grazing intensity
- M:
-
Medium grazing intensity
- H:
-
High grazing intensity
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Acknowledgments
The authors acknowledge Mr. Fermín Sarasa who allowed access to the study area in Estancia San Luis, and Dr. Marta Susana Dardanelli and two anonymous reviewers for their valuable comments to improve this manuscript. This work was supported by grants from the Agencia Nacional de Promoción Científica y Tecnológica (PICT 08-11131, 08-20454, and 02-02192- PICT 1349) and the Consejo Nacional de Investigaciones Científicas y Técnicas (PIP- 112-200801-01664) of Argentina. L. H. Prieto was a fellowship holder of the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
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Olivera, N.L., Prieto, L., Carrera, A.L. et al. Do soil enzymes respond to long-term grazing in an arid ecosystem?. Plant Soil 378, 35–48 (2014). https://doi.org/10.1007/s11104-013-2010-8
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DOI: https://doi.org/10.1007/s11104-013-2010-8