Soil water storage in an upland forest after selective logging in Central Amazonia Armazenamento de água no solo após extração seletiva de madeira em floresta de terra firme na Amazônia Central
Soil water storage of Central Amazonian soil profiles in upland forest plots subjected to selective logging (in average, 8 trees or 34, 3 m³ of timber per hectare were removed) was measured in four layers, down to a depth of 70 cm. The study lasted 27-months and was divided in two phases: measuremen...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ciência do Solo
2004-02-01
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| Series: | Revista Brasileira de Ciência do Solo |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832004000100006 |
| Summary: | Soil water storage of Central Amazonian soil profiles in upland forest plots subjected to selective logging (in average, 8 trees or 34, 3 m³ of timber per hectare were removed) was measured in four layers, down to a depth of 70 cm. The study lasted 27-months and was divided in two phases: measurements were carried out nearly every week during the first 15 months; in the following year, five intensive periods of measurements were performed. Five damage levels were compared: (a) control (undisturbed forest plot); (b) centre of the clearing/gap; (c) edge of the gap; (d) edge of the remaining forest; and (e) remaining forest. The lowest values for water storage were found in the control (296 ± 19.1 mm), while the highest were observed (333 ± 25.8 mm) in the centre of the gap, during the dry period. In the older gaps (7.5-8.5 year old), soil water storage was similar to the remaining and the control forest, indicating a recovery of hydric soil properties to nearly the levels prior to selective logging.<br>Foi medido o armazenamento de água em perfis de solo de 0-70 cm, divididos em quatro camadas em parcelas de floresta de terra firme na Amazônia Central, submetidas à extração seletiva de madeira, tendo sido retiradas, em média, 8 árvores por hectare ou 34 m³ de madeira. O estudo foi realizado num período de 27 meses em duas fases: na primeira, as medidas foram, na sua maioria, semanais, num período de 15 meses. Na segunda, as medidas foram feitas em cinco períodos intensivos. Foram comparados cinco tratamentos: (a) controle (floresta intacta), (b) centro da clareira, (c) borda da clareira, (d) borda da floresta remanescente e (e) floresta remanescente. Os valores mais baixos de armazenamento de água no solo (296 ± 19,1 mm) foram encontrados no controle, enquanto os mais altos foram medidos no centro da clareira (333 ± 25,8 mm), no período seco. Nas clareiras mais antigas (7,5-8,5 anos de idade), os armazenamentos de água no solo foram similares aos da floresta remanescente e controle, indicando a recuperação das propriedades hídricas do solo após a extração seletiva de madeira. |
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| ISSN: | 0100-0683 1806-9657 |