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| 1 | Effects of different forms of nitrogen addition on microbial extracellular enzyme activity in temperate grassland soil显示文摘Background:Nitrogen(N)deposition alters litter decomposition and soil carbon(C)sequestration by influencing the microbial community and its enzyme activity.Natural atmospheric N deposition comprises of inorganic N(IN)and organic N(ON)compounds.However,most studies have focused on IN and its effect on soil C cycling,whereas the effect of ON on microbial enzyme activity is poorly understood.Here we studied the effects of different forms of externally supplied N on soil enzyme activities related to decomposition in a temperate steppe.Ammonium nitrate was chosen as IN source,whereas urea and glycine were chosen as ON sources.Different ratios of IN to ON(Control,10:0,7:3,5:5,3:7,and 0:10)were mixed with equal total amounts of N and then used to fertilize the grassland soils for 6 years.Results:Our results show that IN deposition inhibited lignin-degrading enzyme activity,such as phenol oxidase(POX)and peroxidase(PER),which may restrain decomposition and thus induce accumulation of recalcitrant organic C in grassland soils.By contrast,deposition of ON and mixed ON and IN enhanced most of the C-degrading enzyme activities,which may promote the organic matter decomposition in grassland soils.In addition,theβ-N-acetyl-glucosaminidase(NAG)activity was remarkably stimulated by fertilization with both IN and ON,maybe because of the elevated N availability and the lack of N limitation after long-term N fertilization at the grassland site.Meanwhile,differences in soil pH,soil dissolved organic carbon(DOC),and microbial biomass partially explained the differential effects on soil enzyme activity under different forms of N treatments.Conclusions:Our results emphasize the importance of organic N deposition in controlling soil processes,which are regulated by microbial enzyme activities,and may consequently change the ecological effect of N deposition.Thus,more ON deposition may promote the decomposition of soil organic matter thus converting C sequestration in grassland soils into a C source. | Lili Dong Björn Berg Weiping Gu Zhengwen Wang Tao Sun | 2022 | Ecological Processes2022，11，1： | 1 |
| 2 | Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patients with ischemic cardiomyopathy显示文摘 | Spragg DD Dong J Fetics BJ | 2010 | J Am Coll Cardiol2010，56，10： | 1 |
| 3 | Improved refractory wound healingwith administration of acidic fibroblast growth factor in diabetic rats显示文摘 | Xie LY Zhang ML Dong BJ | 2011 | Diabetes Research and Clinical Practice2011，93，3： | 1 |
| 4 | Optimal left ventricularendo-cardial pacing sites for cardiac resynchronizationtherapy in patients with ischemic cardiomyopathy 显示文摘 | Spragg DD Dong J Fetics BJ | 2010 | J AmColl Cardiol2010，56，10： | 1 |
| 5 | Characterisation of bi-continuous cubic liquid crystalline systems of phytantriol and wa-ter using cryo field emission scanning electron microscopy ( cryoFESEM)显示文摘 | RIZWAN SB DONG YD BOYD BJ | 2007 | Micron2007，38，5： | 1 |
| 6 | How medications affect thyroid function 显示文摘 | Dong BJ | 2000 | West J Med2000，172，： | 1 |
| 7 | Localized increase in nitric oxide production and the expression of nitrix oxide synthase isoforms in rat uterus with experimental intrauterine infection显示文摘 | FANGL NOWICKI BJ DONG YL | 1999 | AmJ Obstet Gynecol1999，181，3： | 1 |
| 8 | Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patients with ischemic cardiomyopathy显示文摘 | Spragg DD Dong J Fetics BJ | 2010 | J Am Coll Cardiol2010，56，10： | 1 |
| 9 | Interdependence between the tem- poral and spatial longitudinal and transverse degrees of partial co- herence and a generalization of the van Cittert- Zernike theorem 显示文摘 | Cai Y Dong Y Hoenders BJ | 2012 | J Opt Soc Am A Opt Image Sci Vis2012，29，12： | 1 |
| 10 | The PKCalpha-D294G mutant found in pituitary and thyroid tumors fails to transduce extracellular signals显示文摘 | ZHU Y DONG Q TAN BJ | 2005 | Cancer Res2005，65，11： | 1 |
| 11 | Biphasic regulation of au-tophagy by miR- 96 in prostate cancer cells under hypoxia显示文摘 | Ma Y Yang HZ Dong BJ ⑷ al | 2014 | Oncotarget2014，5，： | 1 |
| 12 | Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patients with ischemic cardiomyopathy显示文摘 | Spragg DD Dong J Fetics BJ | 2010 | J Am Cardiol2010，56，10： | 1 |
| 13 | Biphasic regulation of autophagy by miR-96 in prostate cancer cells under hypox- ia显示文摘 | Ma Y Yang I/Z Dong BJ | 2014 | Oncotarget2014，5，19： | 1 |
| 14 | Biphasic regulation of autophagy by miR-96 in prostate cancer cells under hypoxia显示文摘 | Ma Y Yang HZ Dong BJ | 2014 | Oncotarget2014，5，19： | 1 |
| 15 | Raltegravir:The first HIV integrase inhibitor显示文摘 | Cocohoba J Dong BJ | 2008 | ClinTher2008，30，10： | 1 |
| 16 | Optimal left ventricular endocar- dial pacing sites for cardiac resynehronization therapy in patients with isehemic cardiomyopathy 显示文摘 | Spragg D Dong J Fetics BJ | 2010 | J Am Coil Cardiol2010，56，10： | 1 |
| 17 | miR - 199a -3p inhibits hep- atocyte growth factor/c - Met signaling in renal cancer carcinoma 显示文摘 | Huang JW Dong BJ Zhang J | 2014 | Tumor Bio12014，35，6： | 1 |
| 18 | Treatment of AIDS and HIV-related conditions: 2001 显示文摘 | Gold Schmidt RH Dong BJ | 2001 | J Am Board Fam Pract2001，14，： | 1 |
| 19 | Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patientswith ischemic cardiomyopathy显示文摘 | Spragg DD Dong J Ferics BJ | 2010 | J Am Coll Cardiol2010，56，10： | 1 |
| 20 | Shear-dependent rolling on yon Willebrand factor of mammalian cells expressing the platelet glycoprotein Ib-IX-V complex显示文摘 | Fredrickson BJ Dong JF Mclntire LV | 1998 | Blood1998，92，10： | 1 |
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