Deep Root Function in Soil Water Dynamics in Cerrado Savannas of Central Brazil
1. Water is a key resource in tropical savannas. Changes in vegetation structure due to land-use change and increased fire frequency may affect the availability of water and the flux of water through these ecosystems. 2. We compared the seasonal soil moisture dynamics of two adjacent savanna ecosyst...
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| Veröffentlicht in: | Functional ecology 2005-08, Vol.19 (4), p.574-581 |
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| creator | Oliveira, R. S. Bezerra, L. Davidson, E. A. Pinto, F. Klink, C. A. Nepstad, D. C. Moreira, A. |
| description | 1. Water is a key resource in tropical savannas. Changes in vegetation structure due to land-use change and increased fire frequency may affect the availability of water and the flux of water through these ecosystems. 2. We compared the seasonal soil moisture dynamics of two adjacent savanna ecosystems with contrasting tree densities in central Brazil. Our goal was to investigate the influence of tree density on deep water uptake, soil water dynamics and evapotranspiration. 3. Soil water was measured using a depth of 7·5 m beneath the tree-dominated cerrado denso ecosystem and to 4 m beneath the grass-dominated campo sujo ecosystem. Plant-available water (PAW) throughout the cerrado denso soil profile ranged from 293 mm at the end of the dry season to 689 mm during the wet season. In the grass-dominated site, PAW in the profile ranged from 155 to 362 mm. 4. During the dry season, ≈82% of the water used in cerrado denso and 67% in campo sujo was extracted from the profile below 1 m. The tree-dominated cerrado denso used 137 mm more water than the grass-dominated campo sujo. Significant deep soil water uptake was also observed during the wet season of 1998, when rainfall was below average. 5. Evapotranspiration (ET) rates (estimated as change in soil moisture over time) were higher in cerrado denso than in campo sujo during both seasons. Estimated ET ranged from 1·4 mm day-1during the dry season to 5·8 mm day-1for the wet season in cerrado denso, and from 0·9 mm day-1in the dry season to 4·5 mm day-1in early wet season in campo sujo. The differences in PAW and ET rates between the two ecosystems are associated not only with differences in root distribution, but also with differences in tree densities and the phenology of full-leaf canopies. 6. Our results suggest that deep-rooted plants may contribute significantly to the water balance of cerrado ecosystems, and that the hydrological cycle of this biome could change as woody vegetation is replaced by exotic grasses and agricultural crops. |
| doi_str_mv | 10.1111/j.1365-2435.2005.01003.x |
| format | Article |
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S. ; Bezerra, L. ; Davidson, E. A. ; Pinto, F. ; Klink, C. A. ; Nepstad, D. C. ; Moreira, A.</creator><creatorcontrib>Oliveira, R. S. ; Bezerra, L. ; Davidson, E. A. ; Pinto, F. ; Klink, C. A. ; Nepstad, D. C. ; Moreira, A.</creatorcontrib><description>1. Water is a key resource in tropical savannas. Changes in vegetation structure due to land-use change and increased fire frequency may affect the availability of water and the flux of water through these ecosystems. 2. We compared the seasonal soil moisture dynamics of two adjacent savanna ecosystems with contrasting tree densities in central Brazil. Our goal was to investigate the influence of tree density on deep water uptake, soil water dynamics and evapotranspiration. 3. Soil water was measured using a depth of 7·5 m beneath the tree-dominated cerrado denso ecosystem and to 4 m beneath the grass-dominated campo sujo ecosystem. Plant-available water (PAW) throughout the cerrado denso soil profile ranged from 293 mm at the end of the dry season to 689 mm during the wet season. In the grass-dominated site, PAW in the profile ranged from 155 to 362 mm. 4. During the dry season, ≈82% of the water used in cerrado denso and 67% in campo sujo was extracted from the profile below 1 m. The tree-dominated cerrado denso used 137 mm more water than the grass-dominated campo sujo. Significant deep soil water uptake was also observed during the wet season of 1998, when rainfall was below average. 5. Evapotranspiration (ET) rates (estimated as change in soil moisture over time) were higher in cerrado denso than in campo sujo during both seasons. Estimated ET ranged from 1·4 mm day-1during the dry season to 5·8 mm day-1for the wet season in cerrado denso, and from 0·9 mm day-1in the dry season to 4·5 mm day-1in early wet season in campo sujo. The differences in PAW and ET rates between the two ecosystems are associated not only with differences in root distribution, but also with differences in tree densities and the phenology of full-leaf canopies. 6. Our results suggest that deep-rooted plants may contribute significantly to the water balance of cerrado ecosystems, and that the hydrological cycle of this biome could change as woody vegetation is replaced by exotic grasses and agricultural crops.</description><identifier>ISSN: 0269-8463</identifier><identifier>EISSN: 1365-2435</identifier><identifier>DOI: 10.1111/j.1365-2435.2005.01003.x</identifier><language>eng</language><publisher>Oxford, UK: British Ecological Society</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; Autoecology ; Biological and medical sciences ; Cerrado ; Dry seasons ; Ecosystems ; evapotranspiration ; Forest soils ; Fundamental and applied biological sciences. 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S.</creatorcontrib><creatorcontrib>Bezerra, L.</creatorcontrib><creatorcontrib>Davidson, E. A.</creatorcontrib><creatorcontrib>Pinto, F.</creatorcontrib><creatorcontrib>Klink, C. A.</creatorcontrib><creatorcontrib>Nepstad, D. C.</creatorcontrib><creatorcontrib>Moreira, A.</creatorcontrib><title>Deep Root Function in Soil Water Dynamics in Cerrado Savannas of Central Brazil</title><title>Functional ecology</title><description>1. Water is a key resource in tropical savannas. Changes in vegetation structure due to land-use change and increased fire frequency may affect the availability of water and the flux of water through these ecosystems. 2. We compared the seasonal soil moisture dynamics of two adjacent savanna ecosystems with contrasting tree densities in central Brazil. Our goal was to investigate the influence of tree density on deep water uptake, soil water dynamics and evapotranspiration. 3. Soil water was measured using a depth of 7·5 m beneath the tree-dominated cerrado denso ecosystem and to 4 m beneath the grass-dominated campo sujo ecosystem. Plant-available water (PAW) throughout the cerrado denso soil profile ranged from 293 mm at the end of the dry season to 689 mm during the wet season. In the grass-dominated site, PAW in the profile ranged from 155 to 362 mm. 4. During the dry season, ≈82% of the water used in cerrado denso and 67% in campo sujo was extracted from the profile below 1 m. The tree-dominated cerrado denso used 137 mm more water than the grass-dominated campo sujo. Significant deep soil water uptake was also observed during the wet season of 1998, when rainfall was below average. 5. Evapotranspiration (ET) rates (estimated as change in soil moisture over time) were higher in cerrado denso than in campo sujo during both seasons. Estimated ET ranged from 1·4 mm day-1during the dry season to 5·8 mm day-1for the wet season in cerrado denso, and from 0·9 mm day-1in the dry season to 4·5 mm day-1in early wet season in campo sujo. The differences in PAW and ET rates between the two ecosystems are associated not only with differences in root distribution, but also with differences in tree densities and the phenology of full-leaf canopies. 6. Our results suggest that deep-rooted plants may contribute significantly to the water balance of cerrado ecosystems, and that the hydrological cycle of this biome could change as woody vegetation is replaced by exotic grasses and agricultural crops.</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Autoecology</subject><subject>Biological and medical sciences</subject><subject>Cerrado</subject><subject>Dry seasons</subject><subject>Ecosystems</subject><subject>evapotranspiration</subject><subject>Forest soils</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General aspects</subject><subject>Human ecology</subject><subject>plant‐available water</subject><subject>Rainy seasons</subject><subject>Soil depth</subject><subject>Soil ecology</subject><subject>Soil water</subject><subject>Soil water content</subject><subject>TDR</subject><subject>time‐domain reflectometry</subject><issn>0269-8463</issn><issn>1365-2435</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqNkMFu3CAQhlGVSt2kfYMcuCQ3uwMYjA85NJtsWylSpKZVj2gWsMTKC1vwptk-fe1slF7LBTT838zoI4QyqNl0Pm5qJpSseCNkzQFkDQxA1E9vyOL144QsgKuu0o0S78hpKRsA6CTnC3J_4_2OfktppKt9tGNIkYZIH1IY6E8cfaY3h4jbYMtcXvqc0SX6gI8YIxaa-qkWx4wDvc74Jwzvydseh-I_vNxn5Mfq9vvyS3V3__nr8tNdZUUnRSWBO6Y4V7z3a4S1WzMNUrfata1ba6G1R-YaQKussFIr6F1jG-cctOAliDNyeey7y-nX3pfRbEOxfhgw-rQvhrWq6RrVTUF9DNqcSsm-N7sctpgPhoGZDZqNmUWZWZSZDZpng-ZpQi9eZmCxOPQZow3lH9-C5JrPu1wdc7_D4A__3d-sbpfza-LPj_ymjCm_8kJ2HWda_AUyR4wG</recordid><startdate>200508</startdate><enddate>200508</enddate><creator>Oliveira, R. S.</creator><creator>Bezerra, L.</creator><creator>Davidson, E. A.</creator><creator>Pinto, F.</creator><creator>Klink, C. A.</creator><creator>Nepstad, D. C.</creator><creator>Moreira, A.</creator><general>British Ecological Society</general><general>Blackwell Science Ltd</general><general>Blackwell Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SN</scope><scope>7UA</scope><scope>C1K</scope></search><sort><creationdate>200508</creationdate><title>Deep Root Function in Soil Water Dynamics in Cerrado Savannas of Central Brazil</title><author>Oliveira, R. S. ; Bezerra, L. ; Davidson, E. A. ; Pinto, F. ; Klink, C. A. ; Nepstad, D. C. ; Moreira, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3953-502d162262feba0bdb1805878d77db8388ea1d40ac6c3c5860fd4c4ddd070e503</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Autoecology</topic><topic>Biological and medical sciences</topic><topic>Cerrado</topic><topic>Dry seasons</topic><topic>Ecosystems</topic><topic>evapotranspiration</topic><topic>Forest soils</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>General aspects</topic><topic>Human ecology</topic><topic>plant‐available water</topic><topic>Rainy seasons</topic><topic>Soil depth</topic><topic>Soil ecology</topic><topic>Soil water</topic><topic>Soil water content</topic><topic>TDR</topic><topic>time‐domain reflectometry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Oliveira, R. S.</creatorcontrib><creatorcontrib>Bezerra, L.</creatorcontrib><creatorcontrib>Davidson, E. A.</creatorcontrib><creatorcontrib>Pinto, F.</creatorcontrib><creatorcontrib>Klink, C. A.</creatorcontrib><creatorcontrib>Nepstad, D. C.</creatorcontrib><creatorcontrib>Moreira, A.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ecology Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Functional ecology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Oliveira, R. S.</au><au>Bezerra, L.</au><au>Davidson, E. A.</au><au>Pinto, F.</au><au>Klink, C. A.</au><au>Nepstad, D. C.</au><au>Moreira, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deep Root Function in Soil Water Dynamics in Cerrado Savannas of Central Brazil</atitle><jtitle>Functional ecology</jtitle><date>2005-08</date><risdate>2005</risdate><volume>19</volume><issue>4</issue><spage>574</spage><epage>581</epage><pages>574-581</pages><issn>0269-8463</issn><eissn>1365-2435</eissn><abstract>1. Water is a key resource in tropical savannas. Changes in vegetation structure due to land-use change and increased fire frequency may affect the availability of water and the flux of water through these ecosystems. 2. We compared the seasonal soil moisture dynamics of two adjacent savanna ecosystems with contrasting tree densities in central Brazil. Our goal was to investigate the influence of tree density on deep water uptake, soil water dynamics and evapotranspiration. 3. Soil water was measured using a depth of 7·5 m beneath the tree-dominated cerrado denso ecosystem and to 4 m beneath the grass-dominated campo sujo ecosystem. Plant-available water (PAW) throughout the cerrado denso soil profile ranged from 293 mm at the end of the dry season to 689 mm during the wet season. In the grass-dominated site, PAW in the profile ranged from 155 to 362 mm. 4. During the dry season, ≈82% of the water used in cerrado denso and 67% in campo sujo was extracted from the profile below 1 m. The tree-dominated cerrado denso used 137 mm more water than the grass-dominated campo sujo. Significant deep soil water uptake was also observed during the wet season of 1998, when rainfall was below average. 5. Evapotranspiration (ET) rates (estimated as change in soil moisture over time) were higher in cerrado denso than in campo sujo during both seasons. Estimated ET ranged from 1·4 mm day-1during the dry season to 5·8 mm day-1for the wet season in cerrado denso, and from 0·9 mm day-1in the dry season to 4·5 mm day-1in early wet season in campo sujo. The differences in PAW and ET rates between the two ecosystems are associated not only with differences in root distribution, but also with differences in tree densities and the phenology of full-leaf canopies. 6. Our results suggest that deep-rooted plants may contribute significantly to the water balance of cerrado ecosystems, and that the hydrological cycle of this biome could change as woody vegetation is replaced by exotic grasses and agricultural crops.</abstract><cop>Oxford, UK</cop><pub>British Ecological Society</pub><doi>10.1111/j.1365-2435.2005.01003.x</doi><tpages>8</tpages></addata></record> |
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| subjects | Animal and plant ecology Animal, plant and microbial ecology Autoecology Biological and medical sciences Cerrado Dry seasons Ecosystems evapotranspiration Forest soils Fundamental and applied biological sciences. Psychology General aspects Human ecology plant‐available water Rainy seasons Soil depth Soil ecology Soil water Soil water content TDR time‐domain reflectometry |
| title | Deep Root Function in Soil Water Dynamics in Cerrado Savannas of Central Brazil |
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