Factors Affecting the Occurrence and Distribution of Pesticides in the Yakima River Basin, Washington, 2000

Johnson, Henry M.

doi:10.3133/sir20075180

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…, 2008). An increase in the use of sprinkler or drip irrigation systems is associated with a reduction in the off‐site transport of moderately to highly hydrophobic pesticides (Johnson, 2007), and retention of pesticides on the field or in the shallow soil promotes uptake, degradation, and infiltration (Klöppel et al. , 1997; Staddon et al.…”

Section: Discussion Of Trendsmentioning

confidence: 99%

“…Additionally, local programs and demonstration projects throughout the region have encouraged farmers to replace their flood or furrow irrigation systems with sprinkler or drip systems to conserve water, soil, and minimize offsite chemical movement ( North Yakima Conservation District, 1999 ; Sutton et al , 2006 ; Orang et al , 2008 ). An increase in the use of sprinkler or drip irrigation systems is associated with a reduction in the off-site transport of moderately to highly hydrophobic pesticides ( Johnson, 2007 ), and retention of pesticides on the field or in the shallow soil promotes uptake, degradation, and infiltration ( Klöppel et al , 1997 ; Staddon et al , 2001 ). Infiltration does not necessarily reduce pesticide transport to a stream (though it will delay delivery), and is associated with contamination of the underlying groundwater with pesticides and their metabolites ( Böhlke, 2002 ; Gilliom et al , 2006 ; Steele et al , 2008 ).…”

Section: Discussion Of Trendsmentioning

confidence: 99%

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Trends in Pesticide Concentrations in Streamsof the Western United States, 1993-20051

Johnson

Domagalski

Saleh

2010

JAWRA Journal of the American Water Resources Association

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Trends in pesticide concentrations for 15 streams in California, Oregon, Washington, and Idaho were determined for the organophosphate insecticides chlorpyrifos and diazinon and the herbicides atrazine, s-ethyl diproplythiocarbamate (EPTC), metolachlor, simazine, and trifluralin. A parametric regression model was used to account for flow, seasonality, and antecedent hydrologic conditions and thereby estimate trends in pesticide concentrations in streams arising from changes in use amount and application method in their associated catchments. Decreasing trends most often were observed for diazinon, and reflect the shift to alternative pesticides by farmers, commercial applicators, and homeowners because of use restrictions and product cancelation. Consistent trends were observed for several herbicides, including upward trends in simazine at urban-influenced sites from 2000 to 2005, and downward trends in atrazine and EPTC at agricultural sites from the mid-1990s to 2005. The model provided additional information about pesticide occurrence and transport in the modeled streams. Two examples are presented and briefly discussed: (1) timing of peak concentrations for individual compounds varied greatly across this geographic gradient because of different application periods and the effects of local rain patterns, irrigation, and soil drainage and (2) reconstructions of continuous diazinon concentrations at sites in California are used to evaluate compliance with total maximum daily load targets.

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Section: Discussion Of Trendsmentioning

confidence: 99%

Section: Discussion Of Trendsmentioning

confidence: 99%

Trends in Pesticide Concentrations in Streamsof the Western United States, 1993-20051

Johnson

Domagalski

Saleh

2010

JAWRA Journal of the American Water Resources Association

Self Cite

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“…These conditions have also led to diminished species richness of insects in various habitats including shrub-steppe (Ball-Damerow et al 2014). Pesticide use in farmland further reduces the insect populations the Tricolored Blackbird requires for successful breeding (Johnson 2007).…”

Section: Discussionmentioning

confidence: 99%

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2022

WBirds

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Understanding birds' evolving responses to urbanization is an essential aspect of contemporary biology, and knowledge of the responses of nocturnal species lags behind that of diurnal species. In this issue of Western Birds, Jonah Gula addresses the occurrence of the Western Screech-Owl in a mosaic of oak woodland, chaparral, and residential development in the foothills of San Diego County, California. He found the owl more reliably in larger patches of woodland and in patches adjacent to undeveloped chaparral. But the distance to and size of the next nearest patch of woodland were unrelated to the owl's occurrence, suggesting the birds disperse readily across the habitats separating the woodland patches.

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“…Drip and sprinkler irrigation methods are favored by orchard owners in the YRB, and drip irrigation only covers a small portion (13%) compared to sprinkler systems (49%). Inefficient methods, such as rill and flood irrigation (36% of total irrigated land) are still common especially in the Kittitas valley and lower valley of the YRB (Johnson, 2000). In the model, the average irrigation efficiency (IE) was assumed to be 0.75 based on all irrigation methods in the YRB.…”

Section: Water Management For Each Climate Conditionmentioning

confidence: 99%

Adaptation of water resources management under climate change

Zhao

Boll

2022

Front. Water

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The rapid growth of demand in agricultural production has created water scarcity issues worldwide. Simultaneously, climate change scenarios have projected that more frequent and severe droughts are likely to occur. Adaptive water resources management has been suggested as one strategy to better coordinate surface water and groundwater resources (i.e., conjunctive water use) to address droughts. In this study, we enhanced an aggregated water resource management tool that represents integrated agriculture, water, energy, and social systems. We applied this tool to the Yakima River Basin (YRB) in Washington State, USA. We selected four indicators of system resilience and sustainability to evaluate four adaptation methods associated with adoption behaviors in alleviating drought impacts on agriculture under RCP4.5 and RCP 8.5 climate change scenarios. We analyzed the characteristics of four adaptation methods, including greenhouses, crop planting time, irrigation technology, and managed aquifer recharge as well as alternating supply and demand dynamics to overcome drought impact. The results show that climate conditions with severe and consecutive droughts require more financial and natural resources to achieve well-implemented adaptation strategies. For long-term impact analysis, managed aquifer recharge appeared to be a cost-effective and easy-to-adopt option, whereas water entitlements are likely to get exhausted during multiple consecutive drought events. Greenhouses and water-efficient technologies are more effective in improving irrigation reliability under RCP 8.5 when widely adopted. However, implementing all adaptation methods together is the only way to alleviate most of the drought impacts projected in the future. The water resources management tool helps stakeholders and researchers gain insights in the roles of modern inventions in agricultural water cycle dynamics in the context of interactive multi-sector systems.

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Factors Affecting the Occurrence and Distribution of Pesticides in the Yakima River Basin, Washington, 2000

Cited by 3 publications

References 7 publications

Trends in Pesticide Concentrations in Streamsof the Western United States, 1993-20051

Trends in Pesticide Concentrations in Streamsof the Western United States, 1993-20051

Untitled

Adaptation of water resources management under climate change

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