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59篇 您的检索式:作者名="Fischer RG"
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1Influence of experimental soil disturbances on the diversity of plants in agricultural grasslands显示文摘Aims and Methods Disturbance is supposed to play an important role for biodiversity and ecosystem stability as described by the intermediate disturbance hypoth-esis(IDH),which predicts highest species richness at intermediate levels of disturbances.In this study,we tested the effects of artificial soil distur-bances on diversity of annual and perennial vascular plants and bryo-phytes in a field experiment in 86 agricultural grasslands differing in land use in two regions of Germany.On each grassland,we implemented four treatments:three treatments differing in application time of soil dis-turbances and one control.One year after experimental disturbance,we recorded vegetation and measured biomass productivity and bare ground.We analysed the disturbance response taking effects of region and land-use-accompanied disturbance regimes into account.Important Findings Region and land-use type strongly determined plant species rich-ness.Experimental disturbances had small positive effects on the species richness of annuals,but none on perennials or bryophytes.Bare ground was positively related to species richness of bryophytes.However,exceeding the creation of 12%bare ground further distur-bance had a detrimental effect on bryophyte species richness,which corresponds to the IDH.As biomass productivity was unaffected by disturbance our results indicate that the disturbance effect on spe-cies richness of annuals was not due to decreased overall produc-tivity,but rather due to short-term lowered inter-and intraspecific competition at the newly created microsites.Generally,our results highlight the importance of soil disturbances for species richness of annual plants and bryophytes in agricultural grasslands.However,most grasslands were disturbed naturally or by land-use practices and our additional experimental soil dis-turbances only had a small short-term effect.Overall,total plant diversity in grasslands seemed to be more limited by the availabil-ity of propagules rather than by suitable microsites for germination.Thus,nature conservation efforts to increase grassland diversity should focus on overcoming propagule limitation,for instance by additional sowing of seeds,while the creation of additional open patches by disturbance might only be appropriate where natural disturbances are scarce.Jörg Müller Johannes Heinze Jasmin Joshi Steffen Boch Valentin H.Klaus Markus Fischer Daniel Prati 2014Journal of Plant Ecology2014,7,6:3
2National Forest Inventories capture the multifunctionality of managed forests in Germany显示文摘Background:Forests perform various important ecosystem functions that contribute to ecosystem services.In many parts of the world,forest management has shifted from a focus on timber production to multi-purpose forestry,combining timber production with the supply of other forest ecosystem services.However,it is unclear which forest types provide which ecosystem services and to what extent forests primarily managed for timber already supply multiple ecosystem services.Based on a comprehensive dataset collected across 150 forest plots in three regions differing in management intensity and species composition,we develop models to predict the potential supply of 13 ecosystem services.We use those models to assess the level of multifunctionality of managed forests at the national level using national forest inventory data.Results:Looking at the potential supply of ecosystem services,we found trade-offs(e.g.between both bark beetle control or dung decomposition and both productivity or soil carbon stocks)as well as synergies(e.g.for temperature regulation,carbon storage and culturally interesting plants)across the 53 most dominant forest types in Germany.No single forest type provided all ecosystem services equally.Some ecosystem services showed comparable levels across forest types(e.g.decomposition or richness of saprotrophs),while others varied strongly,depending on forest structural attributes(e.g.phosphorous availability or cover of edible plants)or tree species composition(e.g.potential nitrification activity).Variability in potential supply of ecosystem services was only to a lesser extent driven by environmental conditions.However,the geographic variation in ecosystem function supply across Germany was closely linked with the distribution of main tree species.Conclusions:Our results show that forest multifunctionality is limited to subsets of ecosystem services.The importance of tree species composition highlights that a lack of multifunctionality at the stand level can be compensated by managing forests at the landscape level,when stands of complementary forest types are combined.These results imply that multi-purpose forestry should be based on a variety of forest types requiring coordinated planning across larger spatial scales.Nadja K.Simons María R.Felipe-Lucia Peter Schall Christian Ammer Jürgen Bauhus Nico Blüthgen Steffen Boch François Buscot Markus Fischer Kezia Goldmann Martin M.Gossner Falk Hänsel Kirsten Jung Peter Manning Thomas Nauss Yvonne Oelmann Rodica Pena Andrea Polle Swen C.Renner Michael Schloter Ingo Schöning Ernst-Detlef Schulze Emily F.Solly Elisabeth Sorkau Barbara Stempfhuber Tesfaye Wubet Jörg Müller Sebastian Seibold Wolfgang W.Weisser 2021Forest Ecosystems2021,8,1:2
3FOLFIRI plus cetuximab versus FOLFIRI plus bevacizumab as first-line treatment for patients with metastatic colorectal cancer (FIRE-3): a randomised, open-label, phase 3 trial显示文摘Volker Heinemann Ludwig Fischer von Weikersthal Thomas Decker Alexander Kiani Ursula Vehling-Kaiser Salah-Eddin Al-Batran Tobias Heintges Christian Lerchenmüller Christoph Kahl Gernot Seipelt Frank Kullmann Martina Stauch Werner Scheithauer J?rg Hielscher 2014Lancet Oncology2014,,10:2
4Changes in sensory properties and consumer acceptance of reduced fat pork Lyon-style and liver sausages containing inulin and citrus fiber as fat replacers显示文摘Maja Tomaschunas Rebecca Z?rb Jürgen Fischer Ehrhard K?hn J?rg Hinrichs Mechthild Busch-Stockfisch 2013Meat Science2013,,3:2
5Nitric oxide and oral diseases: can we talk about it显示文摘de S~ Siqueira MA Fischer RG da Silva Figueredo CM 2010Cardiovasc Hematol Agents Med Chem2010,8,2:1
6A data bank for azeotropic data-status and applications显示文摘Jürgen Gmehling Jochen Menke J(o)rg Krafczyk Kai Fischer 1995Fluid Phase Equilibria1995,103,:1
7Periodontal conditions in patients with juvenile idiopathic arthritis显示文摘Miranda LA Fischer RG Sztajnbok FR 2003J Clin Periodontol2003,30,11:1
8Intrahepatic IL-8 producing Foxp3 + CD4 + regulatory T cells and fibrogenesis in chronic hepatitis C<!-- Doctopic: VH -->显示文摘Bettina Langhans Benjamin Kr?mer Marcell Louis Hans Dieter Nischalke Robert Hüneburg Andrea Staratschek-Jox Margarethe Odenthal Steffen Manekeller Michael Schepke J?rg Kalff Hans-Peter Fischer Joachim L. Schultze Ulrich Spengler 2013Journal of Hepatology2013,,2:1
9Inflammatory howe1 dis ease= Impact and patient characteristics显示文摘Kinash RG Fischer DG Lukie BE 1993Gastroenterology Nursing1993,15,4:1
10The mortality associated with pelvic fractures显示文摘Rothenberger DA Fischer RP Strate RG 1978Surgery1978,84,3:1
11Chnical evaluation of pulp and dentine sensitivity after supragingival and subgingival scaling显示文摘Fischer C Wennberg A Fischer RG 1991Endod Dent Traumatol1991,7,6:1
12Effect of rheumatoid arthritis or systemic lupus erythematosus on the risk of first-time acute myocardial infarction显示文摘Fischer LM Schlienger RG Matter C 2004Am J Cardiol2004,93,2:1
13Prevalence and distribution of cervical dentine hypersensitivity in a population in Rio de Janeiro, Brazil显示文摘Fischer C Fischer RG Wennberg A 1992J Dent1992,20,5:1
14Clinical evaluation of pulp and dentine sensitivity after supragingival and subginival sealing 显示文摘Fischer C Wennberg A Fischer RG 1991Endod Dent Traumatol1991,7,:1
15Prevalence and distribution of cervical dentine hypersensitivity in a population in Rio de Janeiro,Brazil显示文摘Fischer C Fischer RG Wennberg A 1992J Dent1992,20,5:1
16Single daily dose of methimazole compared to every 8 hours propylthiouracil in the treatment of hyperthy- roidism显示文摘Nicholas WC Fischer RG Stevenson Rg 1995South Wed J1995,88,9:1
17The mortatily associated with pelvic fractures 显示文摘Rothenberger DA Fischer RP Strate RG 1978Surgery1978,84,3:1
18Current use of nonsteroidal antiinflammatory drugs and the risk of acute myocardial infarction 显示文摘Fischer LM Schlienger RG Matter CM 2005Pharmaeotherapy2005,25,4:1
19The rubrerythrin-like protein Hsp21 of Clostridium acetobutylicum is a general stress protein显示文摘Falk Hillmann Ralf-J?rg Fischer Hubert Bahl 2006Archives of Microbiology2006,,4:1
20Clinical evaluation of pulp and dentine sensitivity after supragingival and subginival scaling显示文摘Fischer C Wennberg A Fischer RG 1991Endod Dent Traumatol1991,7,:1
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