globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-0024-9
Scopus记录号: 2-s2.0-85027942054
论文题名:
Controls on the oxidative ratio of net primary production in agricultural ecosystems
作者: Gallagher M.E.; Masiello C.A.; Hockaday W.C.; Baldock J.A.; Snapp S.; McSwiney C.P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期:3
起始页码: 581
结束页码: 594
语种: 英语
英文关键词: Carbon oxidation state ; Corn ecosystem ; Ecosystem gas exchange ; Nitrogen fertilization ; Oxidative ratio
Scopus关键词: agricultural ecosystem ; analytical method ; biogeochemistry ; fertilizer application ; gas exchange ; grass ; legume ; net primary production ; nitrogen ; oxidation ; Zea mays
英文摘要: Ecosystem-, biome-, and global-level oxidative ratio (OR) estimates are used to understand ecosystem gas exchange processes, and assess the sizes of the terrestrial biosphere and ocean carbon sinks, and the mechanisms controlling them. We have developed analytical methods to measure the OR of terrestrial carbon stocks from biomass chemistry that give accurate and precise estimates of ecosystem atmosphere-biosphere gas flux OR. Here we apply these techniques to agricultural ecosystems to address two uncertainties: (1) whether changing crop species distribution can change ecosystem OR, and (2) whether nutrient status can change ecosystem OR. Analyzing the top three crops in the U.S. (soybean, corn, wheat), we showed differences between the OR of net primary production (ORab) of legumes (1.109 ± 0.003) versus grass crops (corn: 1.028 ± 0.001; wheat: 1.033 ± 0.001). Our preliminary estimate of the average U.S. agriculture ORab is 1.058 in 2010, and extrapolations indicate that the U.S. agricultural ORab has increased from 1.040 in 1930, likely due to shifts in agricultural land use (e.g. oat acreage decreases while soybean acreage increases over time). We also observed that increasing nitrogen fertilization rate led to only a small increase in ORab. Taken together, our results indicate that it is possible for biome-level ORab to vary over time and space. The largest driver of ORab variation in this study was variation in crop distribution, which changed ORab by an order of magnitude more than variations in nitrogen fertilizer application. © 2014, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83573
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Earth Science, Rice University, 6100 Main St. MS 126, Houston, TX, United States; Nicholas School of the Environment, Duke University, 124 Science Dr., Durham, NC, United States; Department of Geology, Baylor University, One Bear Pl. #97354, Waco, TX, United States; Urrbrae Laboratory PMB 2, CSIRO Land and Water/Sustainable Agriculture Flagship, Glen Osmond, SA, Australia; Department of Plant, Soil & Microbial Sciences, Michigan State University, 1066 Bogue St., East Lansing, MI, United States; W.K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Dr., Hickory Corners, MI, United States

Recommended Citation:
Gallagher M.E.,Masiello C.A.,Hockaday W.C.,et al. Controls on the oxidative ratio of net primary production in agricultural ecosystems[J]. Biogeochemistry,2014-01-01,121(3)
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