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| 1 | Community-level trait responses and intra-specific trait variability play important roles in driving community productivity in an alpine meadow on the Tibetan Plateau显示文摘Aims Human activities have dramatically increased nutrient inputs to ecosys-tems,impacting plant community diversity,composition and function-ing.Extensive research has shown that a decrease in species diversity and an increase in productivity are a common phenomenon following fertilization in grasslands ecosystem.The magnitude of the response of species diversity and above-ground net primary productivity(ANPP)to fertilization mainly depends on species traits(mean trait values)and traits variability(plasticity).Our aim of this study was to examine(i)changes of species diversity(species richness and Shannon-Wiener index)and ANPP following fertilization;(ii)which species traits or community-weighted mean(CWM)traits can determine ANPP,as expected from the‘biomass ratio hypothesis’;and(iii)the relative role of intra-specific and inter-specific trait variability in this process following fertilization.Methods We measured ANPP and four key plant functional traits:specific leaf area(SLA),leaf dry matter content(LDMC),mature plant height(MPH)and leaf nitrogen concentration(LNC)for 25 component species along a fertilization gradient in an alpine meadow on the Tibetan Plateau.In addition,trait variation of species was assessed using coefficients of variation(CV),and we calculated the ratio of the CVintra to the CVinter.Important Findings Our results showed that:(i)fertilization significantly reduced species richness and Shannon-Weiner diversity index,but sig-nificantly increased ANPP;(ii)there was a significant positive correlation between ANPP and CWM-SLA and CWM-MPH,yet there was no significant relationship between ANPP and CWM-LNC or CWM-LDMC;(iii)intra-specific variability in SLA and MPH was found to be much greater than inter-specific variability,especially at the higher fertilization levels.We con-cluded that CWM-SLA and CWM-MPH can be used to assess the impacts of species changes on ecosystem functioning,and dominant species can maximize resource use through intra-spe-cific variability in SLA and MPH to compensate for the loss of species following fertilization,therefore maintaining high com-munity productivity. | Wei Li Jie Zhao Howard E.Epstein Guanghua Jing Jimin Cheng Guozhen Du | 2017 | Journal of Plant Ecology2017，10，4： | 3 |
| 2 | NF-kappa B is Activated and ICAM-1 Gene Expression is Upregulated During Reoxygenation of Human Brain Endothelial Cells显示文摘 | Howard E Chen O Cheng C | 2004 | Neurosci Lett(S0304-3940)2004，248，3： | 1 |
| 3 | NF-κB is activated and ICAM-1 gene expression is upregulated during reoxygenation of human brain endothelial cells显示文摘 | Howard E F Chen Q Cheng C | 1998 | Neurosci Lett1998，248，3： | 1 |
| 4 | Hypertonie marmitol loading of NF- kappaB transcription factor decoys in human brain microvascular endothelial cells blocks upregulation of ICAM - 1 显示文摘 | Hess DC Howard E Cheng C | 2000 | Stroke2000，31，5： | 1 |
| 5 | Hypertonic Mannitol Loading of NF-kB Transcription Factor Decoys in Human Brain Microvascular Endothelial Cells Blocks Upregulation of ICAM-1显示文摘 | Hess DC Howard E Cheng C | 2005 | Stroke(S0039-2499)2005，31，5： | 1 |
| 6 | Risk factors fortraumatic and bloody lumbar puncture in children with acutelymphoblastic leukemia 显示文摘 | HOWARD SC GAJJAR AJ CHENG C | 2002 | JAMA2002，288，16： | 1 |
| 7 | NF-kappa B is activated and ICAM-1 gene expression is upregulated during reoxygenation of human brain endothelial cells 显示文摘 | Chen Q Cheng C Carroll JE Hess D | 1998 | Neurosci Lett1998，248，3： | 1 |
| 8 | An improved model for the turbulent PBL显示文摘 | CHENG Y CANUTO V M HOWARD A M | 2002 | Journal of the Atmospheric Sciences2002，，： | 1 |
| 9 | Ocean turbulence,part I: one-point closure model momentum and heat vertical diffusivities 显示文摘 | CANUTO V M HOWARD A CHENG Y | 2001 | Journal of Physical Oceanography2001，31，6： | 1 |
| 10 | NF -kappa B is activated and ICAM - 1 gene expression is upregulated during reoxygenation of human brain endothelial cells显示文摘 | Howard EF Chen Q Cheng C | 1998 | Neurosci Lett1998，248，3： | 1 |
| 11 | NF-kappaB is activated and ICAM-1 gene expression is upregulation during reoxygenation of human brain endothelial cells 显示文摘 | Howard EF Chen O Cheng C | 1998 | Neurosci Lett1998，248，3： | 1 |
| 12 | NF-kappa B is activated and ICAM-1 gene expression is upregulated during reoxygenation of human brain endothelial cells显示文摘 | Howard EF Chen Q Cheng C | 1998 | Neurosci Lett1998，248，3： | 1 |
| 13 | Hypertonic mannitol loading of NF-kappa B transcripytion factor decoys in human brain microvascular endothelial cells blocks up regulation of ICAM-1显示文摘 | HESSDC HOWARD E CHENG C | 2000 | Stroke2000，31，5： | 1 |
| 14 | Hypertonic mannitol loading of NF-kappaB transcription factor decoys in human brain microvascular endothelial cells blocks upregulation of ICAM-1 显示文摘 | Howard E Cheng C Carroll J Hill WD | 2000 | Stroke2000，31，5： | 1 |
| 15 | Hypertonic mannitol loading NF-κB transcription factor decoys in human brain microvascular edothelial cells blocks up regulation of ICAM-1显示文摘 | Hess DC Howard E Cheng C | 2000 | Stroke2000，3，： | 1 |
| 16 | Nutrient recovery from swine lagoon water by Spirodela punctata显示文摘 | Cheng J Y Bergmann B A Classen J J Stomp A M Howard J W | 2002 | Bioresource Technology2002，81，： | 1 |
| 17 | Short-term responses of an alpine meadow community to removal of a dominant species along a fertilization gradient显示文摘Aims The relationship between biodiversity and ecosystem functioning has intrigued ecologists for several decades,but the effect of loss of a dominant species on community structure and functioning along a nutrient gradient remains poorly understood.The aim of this paper was to test the effect of a dominant species on community structure and function by conducting a species removal experiment along a fertilization gradient.Methods We removed the population of a dominant species(Elymus nutans)in a long-term fertilization field in an alpine meadow on the Tibetan Plateau,China.univariate general linear models were used to evaluate the effects of fertilization and removal on above-ground vegetation characteristics,including photosynthetically active radiation in the understory,species richness,shannon-Weiner diversity index,simpson’s dominance index,above-ground biomass(includ-ing different functional groups)and seedling richness and density.Important Findingsresults revealed that after two plant growing seasons,there was no significant effect of the removal of a dominant species on species richness and diversity of the remaining vegetation,but the biomass of forbs and seedling recruitment were significantly increased indicative of the potential for long-term effects.moreover,removal had a large effect at high fertilization levels,but little effect when fertilization levels were low.our studies indicated that community response to loss of a dominant species was mainly dependent on resource availability and the remaining functional group identities.We also found seedling recruitment was usually more sensitive to the influence of competition of dominant species than the estab-lished vegetation in the short term. | Wei Li Jimin Cheng Kailiang Yu Howard E.Epstein Guozhen Du | 2015 | Journal of Plant Ecology2015，8，5： | 1 |
| 18 | Nutrient recovery from swine lagoon water by Spirodela punctata显示文摘 | Cheng J Bergmann B A Classen J J Stomp A M Howard J W | | 0，，01： | 1 |
| 19 | Hypertonic mannitol loading of NFκB transcription factor decoys in human brain microvascular endothelial ceils blocks upregulation of ICAM-1 显示文摘 | HESS DC HOWARD E CHENG C | 2000 | Stroke2000，31，5： | 1 |
| 20 | N F-kappa B is activated and ICAM-1 gene expression is up regulated during reoxygenation of human brain endothelial cells 显示文摘 | Howard EF Chen Q Cheng C | 1998 | Neurosci Lett1998，248，3： | 1 |
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