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AMBIO－人类环境杂志 2005年第1期34卷 20-24页

作者： Annika nordin Joachim Strengbom Johanna Witzell torgny nsholm Lars Ericson 王胜 Umea PlantScience Centre Department of Forest Genetics and Plant PhysiologySwedish University of Agricultural SciencesSE-901 83 UmeaSweden.

可将临界负荷概念用于确定生态系统能够忍耐的无显著毒害作用的沉积水平。本文总结了瑞典研究课题"跨界大气污染的削减策略(ASTA)"中北方针叶林氮的临界负荷评估工作。不论是瑞典北方低水平氮背景沉降地区的野外实验,还是大尺度的监测研... 详细信息

可将临界负荷概念用于确定生态系统能够忍耐的无显著毒害作用的沉积水平。本文总结了瑞典研究课题"跨界大气污染的削减策略(ASTA)"中北方针叶林氮的临界负荷评估工作。不论是瑞典北方低水平氮背景沉降地区的野外实验,还是大尺度的监测研究,结果都表明:少量增加氮剂量会引发重大的植被变化;并且停止氮输入后,植被恢复非常缓慢。数据表明,即便氮输入的速率低于目前建议的临界负荷(北方针叶林下层植被的经验值为10～15kg n/hm^2·a),生态系统的关键成分也会发生变化。根据这些数据,我们认为临界负荷应降为6 kg n/hm^2·a。

关键词：临界负荷氮沉降针叶林生物多样性北方生态系统植被变化毒害作用评估工作

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Topgrafting as a tool in operational Scots pine breeding

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Journal of Forestry Research 2024年第6期35卷 160-172页

作者： Alisa Heuchel David Hall Curt Almqvist Ulfstand Wennström torgny Persson Department of Ecology and Environmental Science UmeåPlant Science CenterUmeåUniversity90187 UmeåSweden The Forestry Research Institute of Sweden(Skogforsk) P.O.Box 391821 SävarSweden

Effective breeding requires multiplying desired genotypes,keeping them at a convenient location to perform crosses more efficiently,and building orchards to generate material for *** some of these aims can be achieved by conventional grafting involving only rootstock and scion,topgrafting is known to deliver all in a shorter time *** this study,Scots pine scions were grafted onto the upper and lower tree crowns in two clonal archives with the aim of inducing early female and male strobili produc-tion,*** survival rates and strobili production were analyzed with generalized linear mixed ***-vival was low(14%)to moderate(41%),and mainly affected by the topgraft genotype,interstock genotype,crown posi-tion and weather conditions in connection with the grafting *** was not affected by the cardinal position in the crown(south or north).Male flowering was ample three years after grafting and reached 56%in the first year among live scions,increasing to 62 and 59%in consecutive *** flowering was scarce and was 9%at first,later increasing to 26 and 20%of living scions but was strongly affected by the topgraft *** one subset of scions,female flowering was observed 1 year after ***,flowering success was mainly affected by the topgraft and interstock genotypes,and secondary growth of *** is one of few reports on topgrafting in functional Scots pine clonal archives.

关键词： Pinus sylvestris Conifer breeding Flowering stimulation Topgrafting

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On-Line Measurement of the Chemical Oxygen Demand in Wastewater in a Pulp and Paper Mill Using near Infrared Spectroscopy

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Spectral Analysis Review 2014年第4期2卷 19-25页

作者： John Dahlbacka Josefina nystrom torgny Mossing Paul Geladi Tom Lillhonga Unit for Research and Development Novia University of Applied SciencesVaasaFinland Department of Forest Biomaterials and Technology Swedish University of Agricultural SciencesUmeaSweden

Although near infrared (nIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts to produce online predictions of the chemical oxygen demand (COD) in wastewater from a pulp and paper mill using nIR spectroscopy are described. The task was perceived as very challenging, but with a root mean square error of prediction of 149 mg/l, roughly corresponding to 1/10 of the studied concentration interval, this attempt was deemed as successful. This result was obtained by using partial least squares model regression, interpolated reference values for calibration purposes, and by evenly distributing the calibration data in the concentration space. This work may also represent the first industrial application of online COD measurements in wastewater using nIR spectroscopy.

关键词： Chemical Oxygen Demand (COD) Industrial Wastewater near Infrared Spectroscopy (nIR) Multivariate Calibration On-Line Measurement

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