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| 1 | Opposite effects of nitrogen fertilization and plastic film mulching on crop N and P stoichiometry in a temperate agroecosystem显示文摘Aims Crop nitrogen(N)and phosphorus(P)stoichiometry can influence food nutritive quality and many ecosystem processes.However,how and why N and P stoichiometry respond to long-term agricul-tural management practices(e.g.N fertilization and film mulching)are not clearly understood.Methods We collected maize tissues(leaf,stem,root and seed)and soil sam-ples from a temperate cropland under 30-year continuous N fer-tilization and plastic film mulching treatments,measured their C,N and P concentrations(the proportion(%)relative to the sample mass),and used structural equation models to uncover the re-sponding mechanisms for crop N and P contents(the total amount(g/m2)in crop biomass).Important Findings Long-term N fertilization increased N concentrations in all crop tissues but sharply decreased P concentrations in vegetative tis-sues(leaf,stem and root),thereby reducing their C/N ratio and increasing C/P and N/P ratios.The drop in P concentration in vegetative tissues was due to the dilution effect by biomass in-crement and the priority of P supply for seed production.In con-trast,film mulching decreased N concentration but increased P concentrations in most crop tissues,thereby increasing C/N ratio and reducing C/P and N/P ratios.Film mulching increased crop P content by increasing soil temperature and moisture;whereas,mulching showed little effect on crop N content,because a posi-tive effects of soil temperature may have canceled out a negative effect by soil moisture.This indicated a decoupling of P and N uptake by crops under film mulching.In conclusion,N fertiliza-tion and plastic film mulching showed opposite effects of on crop N and P stoichiometry. | Fan Ding Shuangyi Li Xiao-Tao Lü Feike A.Dijkstra Sean Schaeffer Tingting An Jiubo Pei Liangjie Sun Jingkuan Wang | 2019 | Journal of Plant Ecology2019，12，4： | 8 |
| 2 | Body traits in rainbow trout: II Estimates of heritability and of phenotypic and genetic correlations显示文摘 | Schaeffer L R | 1989 | Aquaculture1989，80，： | 1 |
| 3 | The role of cytokines in prostatitis 显示文摘 | Jang T L Schaeffer A J | 2003 | World J Uroi2003，21，2： | 1 |
| 4 | Use of test day yields for genetic evaluation of dairy sires and cows 显示文摘 | Ptak E L R Schaeffer | 1993 | Livest Prod Sci1993，34，： | 1 |
| 5 | 9-(2- hydroxyethoxymethyl) guanine activity against viruses of the herpes group显示文摘 | Schaeffer H J Beauehamp L Miranda P de | 1978 | Nature1978，272，： | 1 |
| 6 | Mapping and quantifying mammalian transcriptomes by RNA-Seq显示文摘 | Mortazavi A Williams B A McCue Kh Schaeffer L Wold B | 2008 | Nature Methods2008，5，7： | 1 |
| 7 | Calcitonin gene-related peptide partly protects cultured smooth muscle cells from apotosis induced by an oxidative stress via activation ERK1/2 MAPK 显示文摘 | Schaeffer C Vandroux D Thomassin L | 2003 | Biochem Biophys Acta2003，1643，13： | 1 |
| 8 | Prevention of bronchopulmonary dysplasia by administration of bovine superoxide dismutase in preterm infants with respiratory distress syndrome显示文摘 | Evans H Concepcion L Jhaveri R Schaeffer H Friedman A | 1984 | J Pediatr1984，105，78： | 1 |
| 9 | Estimates of genetic parameters for a test day model with random regressions for yield traits of first lactation Holsteins显示文摘 | Jamrozik J Schaeffer L R | 1997 | Journal of Dairy Science1997，80，： | 1 |
| 10 | Lipopolysaccharide-based enzyme-linked immunosorbent assay for experimental use in detection of antibodies to Lawsonia intracellularis in pigs 显示文摘 | Kroll J J Eichmeyer M A Schaeffer M L | 2005 | Clinical and Diagnostic Laboratory Immunology2005，12，6： | 1 |
| 11 | Calcitonin generelated peptide partly protects cultured smooth muscle cells from apoptosis induced by an oxidative stress viaactivation of ERK 1 /2 MAP显示文摘 | Schaeffer C Vandroux D Thomassin L | 2003 | Biochem Biophys Acta2003，1643，123： | 1 |
| 12 | Greenhouse gas emissions from hydroelectric reserw~irs 显示文摘 | ROSA L P SCHAEFFER R | 1994 | Ambio1994，23，： | 1 |
| 13 | Aza uracil and related nucleicacid analogs as inhibitors of axillary bud growth in tobacco显示文摘 | Schaeffer G W G L Steffens | 1965 | Tobacco Science1965，，9： | 1 |
| 14 | NdYAG laser closure of a bronchopleural fistula显示文摘 | Wang KP Schaeffer L Heitmiller R | 1993 | Monaldi Arch Chest Dis1993，48，4： | 1 |
| 15 | Strategy for applying genome wide selection in dairy cattle显示文摘 | SCHAEFFER L R | 2005 | Journal of Animal Breeding and Genetics2005，123，4： | 1 |
| 16 | Solubility of monocrotaline in supercritical carbon dioxide and carbon dioxide-ethanol mixture显示文摘 | SCHAEFFER S T ZALKOW L H TEJA A S | 1988 | Fluid Phase Equilibria1988，43，： | 1 |
| 17 | Effect of sleeping position and time after feeding on the organization of sleep/wake states in prematurely born infants显示文摘 | Myers MM Fifer WP Schaeffer L | 1998 | Sleep1998，21，： | 1 |
| 18 | Role of hyperglucagonemia in maintenance of increased rates of hepatic glucose output in type Ⅱ diabetics 显示文摘 | BARON AD SCHAEFFER L SHRAGG P | 1987 | Diabetes1987，36，3： | 1 |
| 19 | The role of cytokines in prostatitis显示文摘 | Jang T L Schaeffer A J | 2003 | World J Urol2003，21，2： | 1 |
| 20 | Application of random regression models in animal breeding 显示文摘 | Schaeffer L R | 2004 | Livest Prod Sci2004，86，： | 1 |
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