Acta Silvatica et Lignaria Hungarica最新文献

{"title":"Enhancement of the Corporate Environmental Performance","authors":"A. Polgár, József Pájer","doi":"10.2478/aslh-2014-0004","DOIUrl":"https://doi.org/10.2478/aslh-2014-0004","url":null,"abstract":"Abstract In the course of the implementation of the environmental management system (EMS), during the planning phase it is of high priority to explore, select and analyse the relevant environmental aspects and impacts. This is the precondition to enhance the real environmental performance (EP). The applied processes are often specific, formal and influenced by the self-interest of a company. The purpose of our work was the uniformly interpretable evaluation of the varied processes, and the creation of an EMS enhancement model through which the physical EP can be improved. The quantitative empirical research (2010-2011) has been conducted by using questionnaires in 114 domestic and multinational companies applying an EMS according to the international standard ISO 14001. In the created database, we have determined the variables which are relevant and adjustable in the process, through a descriptive and multivariable statistical survey. On the basis of the identified performance dimensions, corporate performance indices have been created: the environmental motivation (MOT), environmental performance (EPI), environmental impact evaluation (EIE) and environmental management (EMI) as well as the aggregative index (AGG). With their help, the evaluation of the surveyed corporate performance can be executed uniformly, in a quantifiable way, without any intervention in the corporate processes. Along the outliers of EMS optimization variables, we have identified development points. Their impact was assessed by sensitivity analysis of the indices. The described method offers a model for EMS development, based on self-evaluation. Kivonat A vállalati környezeti teljesítmény fejlesztése. A környezetirányítási rendszer (röviden: KIR) mögött rejlő valós környezeti teljesítmény (röviden: KT) érdekében a „Tervezési (Plan)” fázisban a környezeti tényezők és -hatások feltárása és elemzése, a releváns környezeti tényezők kiválasztása kiemelt fontosságú a rendszer kiépítése során. A tapasztalatok szerint az alkalmazott eljárások gyakran sajátosak, formálisak, a vállalat egyedi érdekei által meghatározottak. Munkánk során célként tűztük ki a változatos eljárások egységesen értelmezhető értékelését és egy olyan KIR fejlesztési modell megalkotását, amely alkalmazásával a fizikai KT javítható. A kvantitatív empirikus kutatást (2010- 2011) az ISO 14001 nemzetközi szabvány szerinti KIR-t alkalmazó hazai és multinacionális vállalatok között (114 db) végeztük kérdőíves módszerrel. A létrehozott adatbázisban leíró és többváltozós statisztikai vizsgálatokkal meghatároztuk a releváns és a folyamatban szabályozható, az optimalizálásra ezért potenciálisan alkalmas változókat, a változópárok korrelációit és a témakör főbb teljesítmény dimenzióit jelentő változócsoportokat. Az azonosított teljesítmény dimenziókra alapozottan teljesítmény indexeket (4+1 db) hoztunk létre: környezetvédelmi motivációs (MOT), környezeti teljesítmény (KTM), környezeti hatásértékelési(KHÉ) és környezeti m","PeriodicalId":53620,"journal":{"name":"Acta Silvatica et Lignaria Hungarica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74873254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of thinning on the diameter increment in black locust (Robinia pseudoacacia L.) stands","authors":"K. Rédei, H. Meilby","doi":"10.21825/SG.V65I0.812","DOIUrl":"https://doi.org/10.21825/SG.V65I0.812","url":null,"abstract":"Black locust is one of the most important stand for ming tree species in Hungary, covering approximately 23% of the forested land (410 thousand ha) and providing 23% of the annual timber cut of the country. Hence, during the past two decades several experiments with this species have been carried out in the country. This paper investigates the influence of thinning on the diameter incremen t in an experiment including four plots. One plot was left as an unthinned control plot and three plots were thinned with various thinning intensities at a ge 22. The experiment was measured at ages 22, 27, 32, and 36. Apparently the thinning intensities app lied on two of the plots did not come up to the intensity required to influence the diameter growth of the remaining upper-storey trees. Therefore, fo r a given tree size the growth of the trees on these two plots did not differ significantly from the gro wth of similar trees in the unthinned plot. By contrast , significant thinning effects on the diameter increment of individual trees were observed on the most heavily thinned plot. Here the diameter increment was enhanced for trees with diameters of less than 20 cm, whereas the largest trees of the stand exhibited moderately increased growth. Apparently a stand density corresponding to the heavy thinning treatment (F w values of 22-23) is required to get a significant thinning response. On the other hand, to avoid thinning shocks, it may be recommendable to apply two moderate thinning treatments instead of a single heavy one.","PeriodicalId":53620,"journal":{"name":"Acta Silvatica et Lignaria Hungarica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68398354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}