FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2950348036> ?p ?o ?g. }

• W2950348036 endingPage "40" @default.
• W2950348036 startingPage "28" @default.
• W2950348036 abstract "Nitrate in groundwater is increasing in many aquifers worldwide due to excessive use of fertilizers. However, the behavior of N-based fertilizer as it leaches through thick vadose zones is still poorly understood, and the long-term effects on groundwater quality in such settings may yet to be fully realized. In this study, deep soil cores were taken below experimental plots where N-fertilizer was applied for nearly 20 years under wheat-maize double cropping in the North China Plain (NCP). N-fertilizer application rates of zero, 400, and 600 kg N ha−1 yr−1 were applied to different plots. Water and N balances were quantified to estimate the leaching rate of NO3−-N below the root zone, and NO3−-N loss via denitrification. Transport pathways of nitrate in the vadose zone were identified using stable isotopes of water (δ18O-H2O & δ2H-H2O) and nitrate (δ18O-NO3− & δ15N-NO3−) from the sampled pore-water and groundwater. The average N transport velocity through the vadose zone ranged from 38 to 41 cm yr−1 and was relatively constant regardless of fertilizer application rate. The transport rates are significantly lower than the long-term rate of groundwater level decline (100 cm yr−1), meaning it is unlikely much of the leachate from chemical N-fertilizers (abundantly applied throughout the region since the 1970s) has entered groundwater via matrix flow. Nitrate isotopes appear to indicate that manure and septic waste (not chemical N-fertilizer) are the major sources of nitrate in groundwater to date. However, stable isotopes show that increased nitrate concentrations in groundwater may also result due to preferential flow in sand layers and/or lateral flow from headwater areas. Denitrification (particularly in the upper 4 m depth of soil) appears to have limited the flux of fertilizer-derived nitrate to some degree. However, the large N stock and generally weak denitrification potential in the deep unsaturated zone, pose a major threat to future groundwater quality. The results have major implications for groundwater quality management in the future." @default.
• W2950348036 created "2019-06-27" @default.
• W2950348036 creator A5016594948 @default.
• W2950348036 creator A5032952556 @default.
• W2950348036 creator A5033158342 @default.
• W2950348036 creator A5050985047 @default.
• W2950348036 creator A5054131078 @default.
• W2950348036 creator A5076191468 @default.
• W2950348036 creator A5086813528 @default.
• W2950348036 creator A5088111638 @default.
• W2950348036 creator A5090390623 @default.
• W2950348036 date "2019-09-01" @default.
• W2950348036 modified "2023-10-10" @default.
• W2950348036 title "Nitrogen stock and leaching rates in a thick vadose zone below areas of long-term nitrogen fertilizer application in the North China Plain: A future groundwater quality threat" @default.
• W2950348036 cites W1525055478 @default.
• W2950348036 cites W1740453092 @default.
• W2950348036 cites W1757497062 @default.
• W2950348036 cites W1920464663 @default.
• W2950348036 cites W1925649791 @default.
• W2950348036 cites W1969356275 @default.
• W2950348036 cites W1969867135 @default.
• W2950348036 cites W1969997496 @default.
• W2950348036 cites W1983854248 @default.
• W2950348036 cites W1984257790 @default.
• W2950348036 cites W1989605123 @default.
• W2950348036 cites W1990464038 @default.
• W2950348036 cites W1997159081 @default.
• W2950348036 cites W2002498633 @default.
• W2950348036 cites W2010821723 @default.
• W2950348036 cites W2012529764 @default.
• W2950348036 cites W2015173401 @default.
• W2950348036 cites W2016095142 @default.
• W2950348036 cites W2016485330 @default.
• W2950348036 cites W2020476689 @default.
• W2950348036 cites W2021350137 @default.
• W2950348036 cites W2023430782 @default.
• W2950348036 cites W2025254507 @default.
• W2950348036 cites W2032292978 @default.
• W2950348036 cites W2037239732 @default.
• W2950348036 cites W2039292146 @default.
• W2950348036 cites W2041343689 @default.
• W2950348036 cites W2053979994 @default.
• W2950348036 cites W2059057056 @default.
• W2950348036 cites W2067332202 @default.
• W2950348036 cites W2068312108 @default.
• W2950348036 cites W2069152805 @default.
• W2950348036 cites W2081134561 @default.
• W2950348036 cites W2083292048 @default.
• W2950348036 cites W2084956957 @default.
• W2950348036 cites W2087693688 @default.
• W2950348036 cites W2087947617 @default.
• W2950348036 cites W2090521269 @default.
• W2950348036 cites W2090965838 @default.
• W2950348036 cites W2097078622 @default.
• W2950348036 cites W2099011564 @default.
• W2950348036 cites W2100823863 @default.
• W2950348036 cites W2109368888 @default.
• W2950348036 cites W2112928405 @default.
• W2950348036 cites W2113141996 @default.
• W2950348036 cites W2114369319 @default.
• W2950348036 cites W2115827608 @default.
• W2950348036 cites W2120279559 @default.
• W2950348036 cites W2124351276 @default.
• W2950348036 cites W2130683986 @default.
• W2950348036 cites W2144705703 @default.
• W2950348036 cites W2149971561 @default.
• W2950348036 cites W2162722601 @default.
• W2950348036 cites W2282246245 @default.
• W2950348036 cites W2294096196 @default.
• W2950348036 cites W2307542374 @default.
• W2950348036 cites W2317875862 @default.
• W2950348036 cites W2469676967 @default.
• W2950348036 cites W2510449158 @default.
• W2950348036 cites W2531415486 @default.
• W2950348036 cites W2568020143 @default.
• W2950348036 cites W2598252249 @default.
• W2950348036 cites W2611554493 @default.
• W2950348036 cites W2619539351 @default.
• W2950348036 cites W2763121107 @default.
• W2950348036 cites W2772067551 @default.
• W2950348036 cites W2777700026 @default.
• W2950348036 cites W2779541552 @default.
• W2950348036 cites W2781687867 @default.
• W2950348036 cites W2794092267 @default.
• W2950348036 cites W2795302694 @default.
• W2950348036 cites W2885479406 @default.
• W2950348036 cites W2889253397 @default.
• W2950348036 cites W294370882 @default.
• W2950348036 doi "https://doi.org/10.1016/j.jhydrol.2019.06.012" @default.
• W2950348036 hasPublicationYear "2019" @default.
• W2950348036 type Work @default.
• W2950348036 sameAs 2950348036 @default.
• W2950348036 citedByCount "45" @default.
• W2950348036 countsByYear W29503480362020 @default.
• W2950348036 countsByYear W29503480362021 @default.
• W2950348036 countsByYear W29503480362022 @default.
• W2950348036 countsByYear W29503480362023 @default.
• W2950348036 crossrefType "journal-article" @default.

• next