Surface /subsurface hydrology and phosphorus transport in the Kissimmee River Basin, Florida

Campbell, Kenneth L.; Capece, John; Tremwel, Terry K.

doi:10.1016/0925-8574(95)00029-1

Cited by 38 publications

(20 citation statements)

References 5 publications

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“…The lower PSR values observed in the Spodosol sites (Table 4) may be attributed to a low soil Mehlich-1 P associated with Spodosols characterized by a highly fluctuating and perched water tables resulting in subsurface lateral flow in the upper soil layers which have the low P sorption capacities. As a result, appreciable P losses will occur since drainage water may not pass through the spodic horizon that has a high P retention capacity and may function as a P filter (Campbell et al 1995).…”

Section: Soil Profile Characteristicsmentioning

confidence: 99%

Silvopasture for reducing phosphorus loss from subtropical sandy soils

Michel¹,

Nair

Nair³

2007

Plant Soil

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Phosphorus (P) losses from sandy soils that are predominant in the 1.4 million ha of pastureland in Florida are a major cause of water pollution. We hypothesized that soil P loss would be lower from silvopastoral systems than from treeless pastures because soil P removal by a combined stand of trees and pasture would be more than that of treeless pasture. Four slash pine (Pinus elliottii Engelm.) + bahiagrass (Paspalum notatum Flüggé) silvopastoral systems located in Alachua, Suwannee, Manatee, and Osceola counties in Florida were selected for the study. The former two sites are on Ultisols, and the latter two on Spodosols. Soil samples were collected at different depth increments. Soil P storage capacity (SPSC), the maximum amount of P that can be safely applied to a soil before it becomes an environmental concern, was calculated. Water-soluble P concentrations in the 0-5 cm soil layer ranged from 4 to 11 mg kg −1 for the silvopasture sites and 10 to 23 mg kg −1 in the treeless pasture sites, with higher P concentrations in the treeless pasture at each location. Total SPSC in the upper 1 m depth ranged from 342 to 657 kg ha −1 in the silvopasture sites and −60 to 926 kg ha −1 in the treeless pasture sites (a negative value indicates that the soil is a P source). The results suggest that P buildup within the soil profile and therefore the chances for loss of P from soil to water bodies were less from silvopastures than from treeless pastures. Thus, silvopasture systems can be expected to provide greater environmental service in regard to water quality protection compared to treeless pastures under comparable ecological settings

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Section: Soil Profile Characteristicsmentioning

confidence: 99%

Silvopasture for reducing phosphorus loss from subtropical sandy soils

Michel¹,

Nair

Nair³

2007

Plant Soil

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“…Therefore, precise studies of non-point sources in Japan are necessary. The same can be said for other countries (Western and Overcash 1980;Campbell et al 1995;Shreve et al 1995;Shimohammadi et al 1997). Therefore, I set out to conduct a survey which continued for seven years at a small agricultural watershed whose area covers 205 ha.…”

Section: Introductionmentioning

confidence: 95%

Runoff water quality characteristics in a small agriculture watershed

Nakasone

2003

Paddy and Water Environment

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I have observed the water quality in the Ohwada District of Kasumigaura Town near Lake Kasumigaura for a period of over seven years (1993)(1994)(1995)(1996)(1997)(1998)(1999). During this observation period, sampling was performed for 3 years at 4-h intervals using an automatic sampler, and the water quality was subsequently analyzed. As a result of this long-term precision study of water quality fluctuation, important new information was obtained. First, the quantity of nitrogen found to have been removed was great, especially in the paddy fields, and this contributed to water quality purification. Secondly, the paddy fields produced algae and this algae supported denitrification in the paddy fields. However, the paddy fields increased the COD runoff. Thirdly, for determining the average water quality by monitoring, monthly sampling is sufficient, though for understanding the fluctuation pattern of the water quality, weekly sampling is necessary.

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“…Thus, runoff rate is highly dependent on land use and land cover. As such, runoff discharged from natural, poorly drained areas is relatively slow and dominated by subsurface flow (Knisel et al, 1978;Campbell et al, 1995). In contrast, rapid drainage is necessary for flood control in urban areas and highly managed agricultural lands where specific water levels are required for crop production.…”

Section: Introductionmentioning

confidence: 97%