Effects of Wetland Conversion to Farming on Water Quality and Sediment and Nutrient Retention in a Tropical Catchment PDF Download
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Author:
Publisher:
ISBN: 9789463950732
Category :
Languages : en
Pages : 131
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Book Description
Author:
Publisher:
ISBN: 9789463950732
Category :
Languages : en
Pages : 131
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Book Description
Author: Abias Uwimana
Publisher: CRC Press
ISBN: 1000025608
Category : Science
Languages : en
Pages : 151
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Book Description
The study used a combination of landscape-scale synoptic surveys (catchment, reaches) and mesocosm surveys (experimental plots) to assess the impacts of conversion of natural valley-bottom wetlands to farming land on the water quality and retention of sediment and nutrients. The results showed that temperature, pH, electrical conductivity and dissolved oxygen concentration decreased, and total suspended solids (TSS) increased with storm water increase. Nitrogen (TN) and phosphorus (TP) accumulated in the catchment during the dry season and washed into the water courses during the early stages of the higher flows, with subsequent lower concentrations at the end of the rains due to dilution. Large proportions of the annual loads of TSS, TP and TN (93%, 60% and 67%, respectively) were transported during rainfall events that occurred in 115 days. Fishponds acted as temporal traps of TSS, TN and TP at the early stages of farming, and were a source of and TN and TP at the end of the farming period, in contrast to rice farming that generated sediments and nutrients early in the farming period and trapped them at the end of the farming season. Wetlands mostly acted as sinks but sometimes as a source of sediment and nutrients.
Author: Abias Uwimana
Publisher: CRC Press
ISBN: 1000025683
Category : Science
Languages : en
Pages : 159
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Book Description
The study used a combination of landscape-scale synoptic surveys (catchment, reaches) and mesocosm surveys (experimental plots) to assess the impacts of conversion of natural valley-bottom wetlands to farming land on the water quality and retention of sediment and nutrients. The results showed that temperature, pH, electrical conductivity and dissolved oxygen concentration decreased, and total suspended solids (TSS) increased with storm water increase. Nitrogen (TN) and phosphorus (TP) accumulated in the catchment during the dry season and washed into the water courses during the early stages of the higher flows, with subsequent lower concentrations at the end of the rains due to dilution. Large proportions of the annual loads of TSS, TP and TN (93%, 60% and 67%, respectively) were transported during rainfall events that occurred in 115 days. Fishponds acted as temporal traps of TSS, TN and TP at the early stages of farming, and were a source of and TN and TP at the end of the farming period, in contrast to rice farming that generated sediments and nutrients early in the farming period and trapped them at the end of the farming season. Wetlands mostly acted as sinks but sometimes as a source of sediment and nutrients.
Author:
Publisher:
ISBN:
Category : Wetland conservation
Languages : en
Pages : 104
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Book Description
Author: United States. Department of the Interior
Publisher:
ISBN:
Category : Reclamation of land
Languages : en
Pages : 358
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Book Description
Author: Michael J. Langland
Publisher:
ISBN:
Category : Agricultural ecology
Languages : en
Pages : 94
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Book Description
Author: Ralph E. Heimlich
Publisher:
ISBN:
Category : Wetland conservation
Languages : en
Pages : 40
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Author: United States. Congress. House. Committee on Agriculture. Subcommittee on Environment, Credit, and Rural Development
Publisher:
ISBN:
Category : Law
Languages : en
Pages : 252
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Book Description
Distributed to some depository libraries in microfiche.
Author: Paul R. Adamus
Publisher:
ISBN:
Category : Wetlands
Languages : en
Pages : 190
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Author: Carol Arlene Johnston
Publisher:
ISBN:
Category : Sedimentation and deposition
Languages : en
Pages : 306
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Book Description
