M.B. Esler , D.W.T. Griffith , F. Turatti , S.R. Wilson , T. Rahn , H. Zhang
{"title":"N2O concentration and flux measurements and complete isotopic analysis by FTIR spectroscopy","authors":"M.B. Esler , D.W.T. Griffith , F. Turatti , S.R. Wilson , T. Rahn , H. Zhang","doi":"10.1016/S1465-9972(00)00033-7","DOIUrl":"10.1016/S1465-9972(00)00033-7","url":null,"abstract":"<div><p>We report the development and application of analytical techniques for atmospheric N<sub>2</sub>O based on Fourier transform infrared (FTIR) spectroscopy. Using mobile low resolution (1 cm<sup>−1</sup>) FTIR spectroscopy in the field, the technique delivers mixing ratio measurements of precision ±0.3 ppbv (0.3 nmol mol<sup>−1</sup>) N<sub>2</sub>O and in situ soil–atmosphere flux chamber measurements of fluxes less than 1 ngN m<sup>−2</sup> s<sup>−1</sup> (0.04 nmol N<sub>2</sub>O m<sup>−2</sup> s<sup>−1</sup>) with a time resolution of 30 min. The method offers the additional advantages of being simultaneously able to measure CO<sub>2</sub>, CH<sub>4</sub> and CO mixing ratios in air to high precision (±0.15 μmol mol<sup>−1</sup>, ±1 nmol mol<sup>−1</sup>, ±0.3 nmol mol<sup>−1</sup>, respectively). By a similar analysis procedure, but with laboratory-based high resolution (0.012 cm<sup>−1</sup>) FTIR spectroscopy, the N<sub>2</sub>O isotope ratios δ<sup>15</sup>N, δ<sup>18</sup>O and δ<sup>17</sup>O are determined simultaneously for a single sample, with current precision of <span><math><mtext>±1.0‰,</mtext><mspace></mspace><mtext>±2.5‰</mtext></math></span> and <span><math><mtext>±4.4‰</mtext></math></span>, respectively. FTIR also resolves the individual contributions of the <sup>15</sup>N<sup>14</sup>N<sup>16</sup>O and <sup>14</sup>N<sup>15</sup>N<sup>16</sup>O to overall δ<sup>15</sup>N. The resolution of these two isotopomers is not possible using conventional isotope ratio mass spectrometry (IRMS). We present laboratory results demonstrating precision, and N-positionally resolved δ<sup>15</sup>N and δ<sup>18</sup>O measurements of UV-photolysed N<sub>2</sub>O in which a distinct asymmetric <sup>15</sup>N positional effect is observed.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 445-454"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00033-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80314764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdul Hadi , K Inubushi , E Purnomo , F Razie , K Yamakawa , H Tsuruta
{"title":"Effect of land-use changes on nitrous oxide (N2O) emission from tropical peatlands","authors":"Abdul Hadi , K Inubushi , E Purnomo , F Razie , K Yamakawa , H Tsuruta","doi":"10.1016/S1465-9972(00)00030-1","DOIUrl":"10.1016/S1465-9972(00)00030-1","url":null,"abstract":"<div><p>Tropical peatlands could be a potential source of nitrous oxide (N<sub>2</sub>O) which has a significant impact on global warming. To reduce N<sub>2</sub>O emission and develop best management practices for peatlands, the formation and emission rates of N<sub>2</sub>O as affected by land-use management (i.e., changing peatland into agricultural land) and the factors affecting the process must be understood. Therefore, one field and three laboratory incubation experiments were carried out during 1998–99 using peatland soils from 12 sites in South Kalimantan (Indonesia) and one site in Sarawak (Malaysia) to quantify the N<sub>2</sub>O emission and the factors affecting it. The results from the field experiment showed that land-use managements, changing water table and locations had a significant impact on N<sub>2</sub>O emission. Changing peatland into cultivated lands (cultivated upland and paddy field) enhanced the N<sub>2</sub>O emission. For example, cultivated upland Cassava crop resulted in the highest amounts of N<sub>2</sub>O emission (1.04 mg N m<sup>−2</sup> h<sup>−1</sup>) compared to other treatments. The N<sub>2</sub>O emission during 1998 was higher than those during 1999 because of the changing water table and dry season in 1998. The laboratory experiments showed that the N<sub>2</sub>O emission was also strongly influenced by land-use management, soil moisture contents, addition of ammonium fertilizer or rice straw and soil depths. For example, the flooded conditions stimulated the N<sub>2</sub>O emission compared to that at 60% moisture contents. Similarly, the addition of ammonium fertilizer suppressed the N<sub>2</sub>O emission compared to control treatments because of the high ammonium contents that inhibit nitrification. Nevertheless, incorporation of rice straw to soil samples from 20 to 40 cm soil depth stimulated N<sub>2</sub>O emission.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 347-358"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00030-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78701855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O.T. Denmead , R. Leuning , I. Jamie , D.W.T. Griffith
{"title":"Nitrous oxide emissions from grazed pastures: measurements at different scales","authors":"O.T. Denmead , R. Leuning , I. Jamie , D.W.T. Griffith","doi":"10.1016/S1465-9972(00)00035-0","DOIUrl":"10.1016/S1465-9972(00)00035-0","url":null,"abstract":"<div><p>Estimates made by the Intergovernmental Panel on Climate Change (IPCC) and the Australian National Greenhouse Gas Inventory Committee (NGGIC) suggest that grazed pastures are substantial anthropogenic sources of nitrous oxide (N<sub>2</sub>O), contributing 28% of all anthropogenic N<sub>2</sub>O emissions globally and >43% for Australia. These estimates are based almost wholly on extrapolations of enclosure experiments to the field scale and uncertainty levels are high. Verification with direct field measurements is needed. This paper reports micrometeorological studies of N<sub>2</sub>O emissions from Australian grazed pastures made at the same location on a variety of space scales. They included a mass-balance study employing a small test plot approximately 0.05 ha in area in which 14 sheep were grazed, tower-based flux measurements representing areas between 25 ha and 5 km<sup>2</sup> and convective boundary-layer budgets representing regions of order 100 km<sup>2</sup>. The mass-balance study, which was considered to be the most reliable micrometeorological approach, gave an average emission over 8 days of 1.87 g N<sub>2</sub>O–N head<sup>−1</sup> d<sup>−1</sup> corresponding to 11.5% of the nitrogen (N) voided by the animals in urine and dung. However, the data set included two days after rain on which emissions were an order of magnitude larger than on the other days in the study. For the latter, the emission of N<sub>2</sub>O accounted for 3.9% of the N excreted. Although uncertainty levels remain high due to large temporal and spatial variability, the micrometeorological measurements suggested that N<sub>2</sub>O emissions might be considerably larger than those predicted by NGGIC algorithms which use emission factors of 0.4% for urine and 1.25% for dung, but appear to be predicted more closely by IPCC algorithms which use 2% for both. The study has indicated ways to improve the precision of relevant micrometeorological approaches.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 301-312"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00035-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77381280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G.X Chen , B Huang , H Xu , Y Zhang , G.H Huang , K.W Yu , A.X Hou , R Du , S.J Han , O VanCleemput
{"title":"Nitrous oxide emissions from terrestrial ecosystems in China","authors":"G.X Chen , B Huang , H Xu , Y Zhang , G.H Huang , K.W Yu , A.X Hou , R Du , S.J Han , O VanCleemput","doi":"10.1016/S1465-9972(00)00036-2","DOIUrl":"10.1016/S1465-9972(00)00036-2","url":null,"abstract":"<div><p>N<sub>2</sub><span>O emissions from agricultural, forest and grassland ecosystems in China were in situ measured by closed chamber method, and estimation of total annual N</span><sub>2</sub>O emissions from these ecosystems and a technique mitigating N<sub>2</sub>O emission from agricultural soil were reported. The results showed: (1) the annual emissions of N<sub>2</sub>O from rice, maize, soybean and wheat field, temperate forest and temperate grassland in China were 1.08–2.99, 0.47–4.51, 1.98, 1.02–2.93, 0.28–1.28 and 0.27–0.61 kg <span><math><mtext>N</mtext><msub><mi></mi><mn>2</mn></msub><mtext>O</mtext><mtext>–</mtext><mtext>N</mtext><mspace></mspace><mtext>ha</mtext><msup><mi></mi><mn>−1</mn></msup></math></span>, respectively. The total annual N<sub>2</sub>O emissions from agricultural, forest and temperate grassland ecosystems in China were estimated as 152.49, 94.10 and 112.13 Gg N, respectively. Industrially co-crystallized ammonium bicarbonate (AB) with dicyandiamide, substituting for ammonium bicarbonate in China, decreased N<sub>2</sub>O emission significantly from a meadow brown soil in laboratory (80.2% at soil moisture 12% and 40.0% at soil moisture 22%, respectively) and upland field condition (74.0%).</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 373-378"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00036-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79628854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Atmospheric production of nitrous oxide from excited ozone and its significance","authors":"Sheo S. Prasad , Edward C. Zipf","doi":"10.1016/S1465-9972(00)00037-4","DOIUrl":"10.1016/S1465-9972(00)00037-4","url":null,"abstract":"<div><p>Today our understanding of the sources and sinks of nitrous oxide (N<sub>2</sub>O) may be at a turning point. Currently, it is believed that there are no atmospheric photochemical sources of N<sub>2</sub>O and that microbial activity at the earth's surface (soil, lake, ocean, etc.) is the major source of atmospheric N<sub>2</sub>O. Anthropogenic activities are thought to release N<sub>2</sub>O into the atmosphere, but their magnitude is uncertain and probably minor. Here we present estimates of atmospheric production of N<sub>2</sub>O from excited ozone (O<sub>3</sub>) based on comprehensive laboratory experiments. These experiments covered a large range of pressures from 1 to 1000 torr to distinguish between the various possibilities on the basis of their pressure dependencies, and used two reaction vessels of widely varying surface-to-volume ratios to distinguish between surface and gas phase reactions. Never before in the history of the experimental studies of N<sub>2</sub>O under atmospherically significant conditions has such a comprehensive coverage of the parameter space been attempted. From this data, the atmospheric production is substantial, being around 40% of its “classical” source strength. In order to put the atmospheric production in proper perspective, we also present those considerations that led us to look into the atmospheric sources. If we accept the IPCC’s 1990 position on the N<sub>2</sub>O source-sink inventory, then the atmospheric production of N<sub>2</sub>O bridges the source deficits. On the other hand, if the later IPCC positions of a nearly balanced inventory is accepted, then the new source means that either the post-1990 IPCC methodology for establishing national inventories of greenhouse gas emissions overestimates N<sub>2</sub>O emissions or there exists some hitherto unrecognized sinks of N<sub>2</sub>O.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 235-245"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00037-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80169506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J.L. Jimenez , J.B. McManus , J.H. Shorter , D.D. Nelson , M.S. Zahniser , M. Koplow , G.J. McRae , C.E. Kolb
{"title":"Cross road and mobile tunable infrared laser measurements of nitrous oxide emissions from motor vehicles","authors":"J.L. Jimenez , J.B. McManus , J.H. Shorter , D.D. Nelson , M.S. Zahniser , M. Koplow , G.J. McRae , C.E. Kolb","doi":"10.1016/S1465-9972(00)00019-2","DOIUrl":"10.1016/S1465-9972(00)00019-2","url":null,"abstract":"<div><p><em>Context Abstract</em>: Nitrous oxide (NO<sub>2</sub>) is a potent greenhouse gas whose atmospheric budget is poorly constrained. One known atmospheric source is the formation of N<sub>2</sub>O on three-way motor vehicle catalytic converters followed by emission with the exhaust. Previous estimates of the magnitude of this N<sub>2</sub>O source have varied widely. Two methods employing tunable infrared lasers to measure N<sub>2</sub>O/CO<sub>2</sub> ratios from a large number of on-road motor vehicles have been developed. Both methods add support to lower estimates of N<sub>2</sub>O emissions from the US motor vehicle fleet, although significant uncertainty remains.</p><p><em>Main Abstract</em>: Two tunable infrared laser differential absorption spectroscopy (TILDAS) techniques have been used to measure the N<sub>2</sub>O emission levels of on-road motor vehicle exhausts. Cross road, open path laser measurements were used to assess N<sub>2</sub>O emissions from 1361 California catalyst equipped vehicles in November, 1996 yielding an emission ratio of (8.8±2.8)×10<sup>−5</sup> N<sub>2</sub>O/CO<sub>2</sub>. A van mounted TILDAS sampling system making on-road N<sub>2</sub>O measurements in mixed traffic in June, 1998 in Manchester, New Hampshire yielded a mean N<sub>2</sub>O/CO<sub>2</sub> ratio of (12.8±0.3)×10<sup>−5</sup>, based on correlated N<sub>2</sub>O and CO<sub>2</sub> concentration peaks attributed to motor vehicle exhaust plumes. The correlation of N<sub>2</sub>O emissions with vehicle type, model year and NO emissions are presented for the California data set. It is found that the N<sub>2</sub>O emission distribution is highly skewed, with more than 50% of the emissions being contributed by 10% of the vehicles. Comparison of our results with those from four European tunnel studies reveals a wide range of derived N<sub>2</sub>O emission indices, with the most recent studies (including this study) finding lower values.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 397-412"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00019-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85010872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A study of the atmospheric photochemical loss of N2O based on trace gas measurements","authors":"Shyam Lal, Varun Sheel","doi":"10.1016/S1465-9972(00)00043-X","DOIUrl":"10.1016/S1465-9972(00)00043-X","url":null,"abstract":"<div><p>Nitrous oxide (N<sub>2</sub>O) plays an important role in ozone chemistry as well as in greenhouse warming. It is the source of NO<sub><em>x</em></sub> radicals in the stratosphere which are the dominant catalysts for ozone depletion. Recently, doubts have been raised on the global N<sub>2</sub>O budget. One approach to solve this problem has been the consideration of new mechanisms for atmospheric production and destruction of N<sub>2</sub>O. In parallel, N<sub>2</sub>O sinks have been constrained from observed tracer correlations in the lower stratosphere based on aircraft measurements, which are limited up to an altitude of only 20 km. We use vertical distributions of N<sub>2</sub>O and other trace gases measured simultaneously from Hyderabad, India (17.5°N, 78.6°E) in 1987, 1990, 1994 and 1998 using balloon-borne cryogenic air samplers covering the altitude range of about 8–37 km to study these issues together with 2-D model simulations. The slopes of N<sub>2</sub>O correlations with CH<sub>4</sub>, CFC-12 and CFC-11 compare well with the model derived slopes, with exceptions in cases where dynamical perturbations are strong. Average N<sub>2</sub>O lifetimes of 85±43 and 111±38 years have been estimated using the observed slopes and two sets of reference lifetimes for the correlated tracers. This average lifetime compares well within the spread, with the lifetime estimated from the sink of N<sub>2</sub>O in the model, suggesting that the present estimate of the N<sub>2</sub>O photochemical sink incorporated in the model is adequate.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 455-463"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00043-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77093634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Abatement technologies for N2O emissions in the adipic acid industry","authors":"A Shimizu, K Tanaka, M Fujimori","doi":"10.1016/S1465-9972(00)00024-6","DOIUrl":"10.1016/S1465-9972(00)00024-6","url":null,"abstract":"<div><p>Adipic acid (AA) is the main intermediate in nylon 6, 6 that is manufactured by polymerization condensation of AH salt (hexamethylenediammonium adipate). Adipic acid is also an intermediate in the production of polyester-polyol, a material used in polyurethane.</p><p>Annual production capacity of AA for 1998 was estimated to be 2.3 million metric tons and about 80% of that AA is used to manufacture nylon 6, 6. Almost all AA is produced by nitric acid oxidation of KA oil, a mixture of cyclohexanone and cyclohexanol.</p><p>The reaction of nitric acid oxidation unavoidably generates nitrous oxide. The N<sub>2</sub>O emission coefficient for Japan's AA plant is approximately 0.25 kg-N<sub>2</sub>O/kg-AA. If the N<sub>2</sub>O output from all adipic acid plants is calculated using the N<sub>2</sub>O emission coefficient described above and the world's AA production capacity then we obtain a figure of 576,250 metric tons per year, but if we calculate only that which will be clearly reduced by 1999–2000, a reduction of ca. 80% has already been achieved. This is because the N<sub>2</sub>O abatement equipment of the major AA manufacturers is scheduled to have completed startup by 1999–2000.</p><p>The main technologies used to reduce nitrous oxide in the adipic acid industry are catalytic decomposition and thermal destruction. These methods convert nitrous oxide into nitrogen and oxygen. Catalytic decomposition operates at about 500°C and thermal destruction operates at and over 1000°C. Using these reduction technologies allows the adipic acid manufacturers to reduce N<sub>2</sub>O emissions by 90% or more.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 425-434"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00024-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84792048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"N2O and NO emissions from soils after the application of different chemical fertilizers","authors":"Hiroko Akiyama , Haruo Tsuruta , Takeshi Watanabe","doi":"10.1016/S1465-9972(00)00010-6","DOIUrl":"10.1016/S1465-9972(00)00010-6","url":null,"abstract":"<div><p>Three nitrogen chemical fertilizers were applied to soil – controlled-release urea (CU), a mixture of ammonium sulfate and urea with nitrification inhibitor (AM), and a mixture of ammonium sulfate and urea with no nitrification inhibitor (UA). N<sub>2</sub>O and NO fluxes from an Andosol soil in Japan were measured six times a day for three months with an automated flux monitoring system in lysimeters. The total amount of nitrogen applied was 20 g N m<sup>−2</sup>. The total N<sub>2</sub>O emissions from CU, AM and UA were 1.90, 12.7, and 16.4 mg N m<sup>−2</sup>, respectively. The total NO emissions from CU, AM and UA were 231, 152, and 238 mg N m<sup>−2</sup>, respectively. The total NO emission was 12–15 times higher than the total N<sub>2</sub>O emission. High peaks in N<sub>2</sub>O and NO emissions from UA occurred for one month after the basal fertilizer application. The N<sub>2</sub>O emissions from CU and AM during the peak period were 50% of those from UA, and the NO emissions were less than 50% of those from UA. After the peak period, the N<sub>2</sub>O and NO emissions from CU were the highest for two months. A negative correlation was found between the flux ratio of NO–N to N<sub>2</sub>O–N and the water-filled pore space. A diel pattern with increased N<sub>2</sub>O and NO fluxes during the day and with decreased fluxes during the night was observed.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 313-320"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00010-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83824794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effects of soil compaction on N2O emission in agricultural soil","authors":"B.K. Sitaula , S. Hansen , J.I.B. Sitaula , L.R. Bakken","doi":"10.1016/S1465-9972(00)00040-4","DOIUrl":"10.1016/S1465-9972(00)00040-4","url":null,"abstract":"<div><p>We have studied the effect of soil compaction on N<sub>2</sub>O fluxes in relation to gas diffusion and N fertilization in the field, and N<sub>2</sub>O release rates in laboratory incubated soil samples. The fertilization and soil compaction field experiment was established in 1985, and the gas fluxes were measured in the period from 1992 to 1994. N<sub>2</sub>O emission was higher in compacted than in uncompacted soil. This compaction effect was four times higher in the NPK-fertilized treatment compared to the unfertilized one. Soil compaction decreased gas diffusivity and this may have contributed for increased N<sub>2</sub>O emission. This increased N<sub>2</sub>O emission due to soil compaction in the field became non-significant after the compacted soil was sieved (2-mm mesh) and N<sub>2</sub>O emission rates were measured in laboratory incubations. The sieving presumably removed diffusion barriers and increased the oxygen supply compared with that under the soil compaction in field. This reversibility of field compaction effects indicates that the soil compaction does not permanently increase the biological potential for N<sub>2</sub>O production in the soil.</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"2 3","pages":"Pages 367-371"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(00)00040-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82742845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}