|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 尼加拉瓜废弃农田次生演替后的土壤种子库(英文)显示文摘定量分析了被废弃4年、9年和14年的农田地上派生的次生林土壤中种子组成和密度,从而检测在次生林演替形成过程中,土壤种子库是否能随着植物种群的集成而集成。分别在废弃了4年、9年和14年的农田地里(15cm×15cm样方、9cm土层深),掘取了18,37和48份土壤样品。在废弃了4,9和14年的农田地上,分别发现了3,5和9个物种。在这些不同的生命形态中,在9年和14年的迹地上,土壤种子树木占主要成分,分别为60%和33%,而4年废弃迹地主要被非木本植物所占领。三块废弃地里,4年废弃迹地植物种子的总数为327粒,相应可发育的种子密度为141粒/m2,14年废弃迹地种子的总数为46粒,相应的可发育种子的密度为26粒/m2,指明种子数、种子密度随废弃地龄成下降趋势。在9年和14年龄废弃地上,土壤种子植物种类与立地木本植物种类的相似度较低,而4年龄地上两者比较则完全不同。我们认为:土壤种子库的物种构成是在次生演替过程中逐渐形成的,但是,所获得的总体种子密度太低,仅仅依赖于这些种子来实现树木自然再生是不可靠的。为了加快这些废弃地次生林的恢复,既要依靠自然集成的土壤种子库,还需要通过直播、所需物种的强化种植和设定人工生长环境以利于种子传播。 | Benigno González-Rivas Mulualem Tigabu Guillermo Castro-Marín Per Christer Odén | 2009 | Journal of Forestry Research2009，20，4： | 3 |
| 2 | 老挝过度采伐热带混合落叶林区的人工补植(英文)显示文摘人工补植通常用于增加低商业价值树种盛行的次生林中期望树种的密度。本研究评估了均格种植法(vis-à-vis gap)和行植法(line planting)2种人工补植方法,以及老挝过度采伐的热带混合落叶林中的青皮木(Vatica cinerea) 和龙脑香木(Dipterocarpus alatus)和3种豆科植物(缅茄 Afzeliax ylocarpa,大果紫檀Pterocarpus macrocarpus,酸枝木Dalbergia cochinchinensis)的表现。人工补植实验安捧在了一个随机完整的大块场地,做了7个重复。栽植7年后测定了存活率、高度和直径生长,并进行方差分析。用2种人工补植方法栽植的幼苗的存活率没有发生变化(p>0.05)。然而,就直径和高度生长而言,均格种植法要比行植法效果更好。这与林冠在格间和行间块速封闭有关,这种情况在行间更加明显。在存活率,高度和直径生长方面,存在着明显的种间变异。耐阴的龙脑香科树种存活率和生长表现优于喜光树种(p<0.0001)。个体的大小分布不规则,说明林下光照条件不均衡。考虑到行植法很难维持恒定线条宽度和均匀光线条件,及其每年用于清理的成本和僵硬的几何模式,我们推荐采用均格种植法。龙脑香木(Diperocarpus alatus)和青皮木(V.cinerea)可用于混合阔叶林人工补植的树种。缅茄、酸枝木和大果紫檀可作为人工林的混合树种,在较宽林隙地、直线区域和开放地种植或在火耕林幼林冠下种植。 | Sovu Mulualem Tigabu Patrice Savadogo Per Christer Odén Lamphoune Xayvongsa | 2010 | Journal of Forestry Research2010，21，3： | 3 |
| 3 | 不同干扰梯度下尼泊尔森林树种多样性和优势种的变化(英文)显示文摘中度干扰可以增强多样性,因此干扰常作为一种管理手段。因而,了解森林干扰的频度和强度以及对林分结构、优势度以及森林多样性等的作用是非常重要的。本研究在尼泊尔设立25个1 ha样地,调查了不同干扰程度对以婆罗双树为优势种的5个林地生物多样性和优势度的影响。共记录67个树种,其中41个树种在轻度干扰的森林,10个在重度干扰的森林。林地之间α多样性差异显著。α多样性随干扰梯度线性降低,而优势度则呈线性增加。婆罗双树相对基面积随干扰强度而增加,重度干扰林下该树种重要值是轻度干扰林下的2倍。α多样性随婆罗叔树相对基面积的增加而以3倍的比率降低。在任意一对干扰林中,树种组成相似性均很低(相似性指数<57%),说明β多样性较高。结论:婆罗双树林多样性随干扰强度增加而降低,但是优势度增加。建议控制优势种(婆罗双树)种群,来提高多样性,实现多功能利用的森林管理目标。图5表6参32。 | Indra Prasad Sapkota Mulualem Tigabu Per Christer Odén | 2010 | Journal of Forestry Research2010，21，1： | 2 |
| 4 | Physico-chemical characteristics and heavy metal concentrations of copper mine wastes in Zambia:implications for pollution risk and restoration显示文摘Soil characterization is a vital activity to develop appropriate and effective restoration protocols for mine wastelands while insights into the total content of heavy metals in the soil is an important step in estimating the hazards that the metals may pose to the vital roles of soil in the ecosystem.This study addressed the following research questions:(1)To what extent do the physico-chemical characteristics vary between mine waste sediments and the nearby forest soil?(2)Are the concentrations of heavy metals high enough to be considered as toxic?and(3)Are heavy metals present in mine waste sediments potential sources of pollution?We hypothesized that the physicochemical characteristics of mine waste sediments are less favorably for plant establishment and growth while the concentrations of heavy metals are very high,thus restricting the success of revegetation of mine waste lands.Mine waste sediments were sampled following a diagonal transect across tailings dams,overburden dump sites and the local forest soil from the top layer(0-20 cm)using a closed auger.Samples were analyzed for arsenic,barium,lead,cadmium,cobalt,copper,chromium,nickel,vanadium,and zinc as well as for soil physico-chemical properties.The mine waste sediments were dominated by silt whilst the forest soil by sand particles,with significantly high bulk density in the former.Both the forest soil and overburden sediments were acidic than the alkaline tailings dam sediment.Total organic carbon and nitrogen contents were significantly low in mine wasteland substrates but the concentration of Ca and Mg were significantly higher in tailings dam substrate than the forest soil.The concentrations of available P,K and Na were similar across sites.The mean concentrations of heavy metals were significantly(p<0.01)higher in mine waste sediments than the forest soil;except for cadmium(p=0.213).The order of contamination by heavy metals on the tailings was Cu>Co>Ba>Ni>As>Zn>Pb>Cr>V>Cd,and that on the overburdens was Cu>Co>Ba>Ni>Zn>Cr>Pb>V>As>Cd.The pollution load index(PLI)was nearly twice higher for the tailings dam(8.97)than the overburden(5.84).The findings show that the copper mine wastes(the tailings dams and overburden waste rock sites)are highly contaminated by heavy metals;which,in turn,might pose serious hazards to human health and agricultural productivity.In addition,poor macro-nutrient availability,substrate compaction and soil acidity(particularly on overburden sites)coupled with toxic level of heavy metals would be the main challenges for successful phytostabilization of copper mine wastelands. | Mutale N.Chileshe Stephen Syampungani Emma Sandell Festin Mulualem Tigabu Abolfazl Daneshvar Per Christer Odén | 2020 | Journal of Forestry Research2020，31，4： | 2 |
| 5 | Modulation of ephrinB2 leads to increased angiogenesis in ischemic myocardium and endothelial cell proliferation显示文摘 | Agneta M?nsson-Broberg Anwar J. Siddiqui Maria Genander Karl-Henrik Grinnemo Xiaojin Hao Agneta B. Andersson Eva W?rdell Christer Sylvén Matthias Corbascio | 2008 | Biochemical and Biophysical Research Communications2008，，3： | 1 |
| 6 | Flotation techniques to improve viability of Juniperus polycarpos seed lots显示文摘The germination of freshly collected Juniperus polycarpos(K. Koch) seeds is very low and attributed to the large proportion of nonviable seeds in the seed lots.Thus, the aim of this study was to improve seed lot quality by removing nonviable seeds using two flotation techniques: incubation-drying-separation(IDS) and modified specific gravity(MSG) separation. We examined different IDS conditions(the specific incubation time, subsequent drying time and sorting media) for effectively sorting out nonviable seeds; and tested the feasibility of modified SG separation, which involved soaking seeds in water for a certain period before sorting in different concentrations of sucrose solution. Viable seeds were expected to absorb and metabolically bind more water during soaking than dead seeds could, and hence be sorted effectively depending on the viscosity of the sucrose solution. The viability of the seeds that floated or sank was determined in a topographical tetrazolium chloride(TTC) test. For the IDS trial,7 days incubation followed by 9 h of drying and sedimentation in pure water or 200 g L-1sucrose solution identified, respectively, 75 and 82 % of the seeds as viable(sunken) seeds. For the MSG trail, 77 % viable seeds were recovered in the sunken fraction when seeds were soaked for 48 h then immediately sorted in 600 g L-1sucrose solution. In both cases, the loss of viable seeds in the discarded floating fraction was only 4 %. The results demonstrate that both IDS and MSG separation techniques substantially improved seed lot viability, but MSG separation is simple and needs no modern seed handling facility, and its efficacy relies on seed mass(due to the initial soaking) and the specific density and viscosity of the flotation medium. | Abolfazl Daneshvar Mulualem Tigabu Asaddollah Karimidoost Per Christer Odén | 2017 | Journal of Forestry Research2017，28，2： | 1 |
| 7 | Marker-assisted selection of restored male-fertile Brassica napus plants using a set of dominant RAPD markers显示文摘 | Mats Hansen Christer Halldén Nils-Otto Nilsson Torbj?rn S?ll | 1997 | Molecular Breeding1997，，6： | 1 |
| 8 | Infliximab as Rescue Therapy in Severe to Moderately Severe Ulcerative Colitis: A Randomized, Placebo-Controlled Study显示文摘 | Gunnar J?rnerot Erik Hertervig Ingalill Friis-Liby Lars Blomquist Per Karlén Christer Gr?nn? Mogens Vilien Magnus Str?m ?ke Danielsson Hans Verbaan Per M. Hellstr?m Anders Magnuson Bengt Curman | 2005 | Gastroenterology2005，，7： | 1 |
| 9 | Hydrogen-bonded layers of hydrogen malate anions:a framework for crystal engineering显示文摘 | Christer B A Mark N | 1994 | J Am Chem Soc1994，116，10： | 1 |
| 10 | Infliximab as Rescue Therapy in Severe to Moderately Severe Ulcerative Colitis: A Randomized, Placebo-Controlled Study显示文摘 | Gunnar J?rnerot Erik Hertervig Ingalill Friis-Liby Lars Blomquist Per Karlén Christer Gr?nn? Mogens Vilien Magnus Str?m ?ke Danielsson Hans Verbaan Per M. Hellstr?m Anders Magnuson Bengt Curman | 2005 | Gastroenterology2005，，7： | 1 |
| 11 | CYCLOSPORINE PLASMA LEVELS IN RENAL TRANSPLANT PATIENTS: ASSOCIATION WITH RENAL TOXICITY AND ALLOGRAFT REJECTION显示文摘 | G?RAN KLINTMALM JULIETTE S?WE OLLE RINGDéN CHRISTER VON BAHR ANITA MAGNUSSON | 1985 | Transplantation1985，，： | 1 |
| 12 | Integrating reliability and timing analysis of CAN-based systems显示文摘 | Hans H Thomas N Christer N | 2002 | IEEE Transactions on Industrial Electronics2002，49，6： | 1 |
| 13 | Occupational allergic contact dermatitis caused by sterile non‐latex protective gloves: clinical investigation and chemical analyses显示文摘 | Ann Pontén Nils Hamnerius Magnus Bruze Christer Hansson Christina Persson Cecilia Svedman Kirsten Th?rneby Andersson Ola Bergendorff | 2012 | Contact Dermatitis2012，，2： | 1 |
| 14 | Effects of training at simulated altitude on performance and muscle metabolic capacity in competitive road cyclists显示文摘 | Nicolas Terrados Jan Melichna Christer Sylvén Eva Jansson Lennart Kaijser | | European Journal of Applied Physiology and Occupational Physiology0，，： | 1 |
| 15 | Intravascular Fluid Administration and Hemodynamic Performance During Open Abdominal Surgery显示文摘 | Christer H. Svensén Joel Olsson Robert G. Hahn | 2006 | Anesthesia & Analgesia2006，，3： | 1 |
| 16 | The effect of particle size and shape on the surface specific dissolution rate of microsized practically insoluble drugs 显示文摘 | MITRA M CHRISTER N | 1995 | International Journal of Pharmaceutics1995，122，： | 1 |
| 17 | Characterisation of the 5' integration site and development of an event-specific real-time PCR assay for NK603 maize from a low starting copy number显示文摘 | Christer R N Kunt G B Arne H J | 2004 | European Food Research and Technology2004，219，： | 1 |
| 18 | Identification of a free fatty acid receptor,FFA2R,expressed on leukocytes and activated by short-chain fatty acids显示文摘 | NILSSON E N KNUT K CHRISTER O | 2003 | Biochem Biophys Res Commun2003，303，： | 1 |
| 19 | The relative importance of different regeneration mechanisms in a selectively cut savanna-woodland in Burkina Faso, West Africa显示文摘 | Catherine Ky-Dembele Mulualem Tigabu Jules Bayala Sibiri Jean Ouédraogo Per Christer Odén | 2007 | Forest Ecology and Management2007，，1： | 1 |
| 20 | Synergistic action between inhibition of P2Y12/P2Y1 and P2Y12/ thrombin in ADP-and thrombin-induced human platelet activation显示文摘 | Sven N Christer M | 2004 | Br J Pharmacol2004，142，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员