Evaluation of the hydrological impact of a forestation of Eucalyptus viminalis Labill. in a typical environment of the Pampas plain, Argentina
The transitions from herbaceous to woody systems, usually have the most significant water imprints. This effect on the water resource, both in the soil and in the aquifer, can be magnified in flat territories. To analyze the dynamics of water in the soil and aquifer continuously, two plots were established in an environment typical of the Pampas plain, one located in a forestation with Eucalyptus viminalis Labill. and another in a paired grassland. In the forestation the average transpiration, the redistribution of the precipitations in the components; direct precipitation, stemflow and interceptation were measured and in both plots the depth of the aquifer and the soil moisture at 20 and 50 cm depth over a period of 2 years. Also, a numerical simulation was carried out to estimate the transpiration of the most common summer crops in the region. In this study a connection of the vegetation with the aquifer was not verified. A drier soil profile was found in the forest plot than in the herbaceous plot and a redistribution of rainfall components similar to that reported by other authors in the region was recorded. In addition, the average values of transpiration in forestation were similar to the results obtained by numerical modeling of a Glycine max culture. It was concluded that the petrocalcic horizon plays a fundamental role in the hydrological cycle and that the lower values of soil moisture under the forest plot do not generate a negative impact on the groundwater.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata
2020
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| Online Access: | https://revistas.unlp.edu.ar/revagro/article/view/10924 |
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| Summary: | The transitions from herbaceous to woody systems, usually have the most significant water imprints. This effect on the water resource, both in the soil and in the aquifer, can be magnified in flat territories. To analyze the dynamics of water in the soil and aquifer continuously, two plots were established in an environment typical of the Pampas plain, one located in a forestation with Eucalyptus viminalis Labill. and another in a paired grassland. In the forestation the average transpiration, the redistribution of the precipitations in the components; direct precipitation, stemflow and interceptation were measured and in both plots the depth of the aquifer and the soil moisture at 20 and 50 cm depth over a period of 2 years. Also, a numerical simulation was carried out to estimate the transpiration of the most common summer crops in the region. In this study a connection of the vegetation with the aquifer was not verified. A drier soil profile was found in the forest plot than in the herbaceous plot and a redistribution of rainfall components similar to that reported by other authors in the region was recorded. In addition, the average values of transpiration in forestation were similar to the results obtained by numerical modeling of a Glycine max culture. It was concluded that the petrocalcic horizon plays a fundamental role in the hydrological cycle and that the lower values of soil moisture under the forest plot do not generate a negative impact on the groundwater. |
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