Puude seisundi hindamine metsa kasvukäigu püsiproovitükkidel
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Kuupäev
2015
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Ajakirja pealkiri
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Abstrakt
Viljakates kasvukohatüüpides kasvavad männikud on juuremädaniku poolt enam kahjustatud kui vähem viljakates kasvukohatüüpides. Mädanikud ei ole tihtipeale väliselt kergesti aimatavad, seetõttu võib väliselt terveks peetav puistu olla rohkem kahjustunud, kui visuaalsel hindamisel oletatakse.
Käesoleva töö eesmärgiks oli uurida viljakates (jänesekapsa ja jänesekapsa-pohla) kasvukohatüüpides kasvavate 80 – 105-aastaste majandatavate männikute tervislikku seisundit ning selgitada välja, kas puistute elujõulisust on võimalik visuaalselt hinnata. Tervisliku seisundi hindamiseks valiti kaheksalt Eesti metsa kasvukäigu püsiproovitükkide võrgustiku püsiproovitükilt terved, jalalseisvad surnud ja riketega puud, mida puuriti resistograafiga juurekaelalt ning rinnakõrguselt hindamaks mädaniku esinemist puul.
Töö tulemustest selgus, et vaid ühel proovitükil kaheksast ei olnud visuaalselt terveks hinnatud puud puurimistulemuste põhjal mädanikuga kahjustunud. Uuritavad puistud olid rohkem kahjustunud kui ainult vaatlustulemuste põhjal oletada võis, mistõttu ei osutu puistu tervisliku seisundi visuaalne hindamine jänesekapsa ja jänesekapsa-pohla kasvukohatüübis mõistlikuks.
Puistu ja puude tervisliku seisundi võimalikult realistlik hindamine on aga väga oluline prognoosimaks metsa kasvu dünaamikat ja puude suremist ning koostamaks täpsemaid prognoosimudeleid. Varasemalt ei ole KKPRT võrgustiku püsiproovitükkide tervislikku seisundi visuaalset hindamist resistograafi abil kontrollitud.
Pine stands growing at fertile site types are more affected by root-rot causing fungi than pine stands that grow at less fertile site types. Fungal diseases are often not easily detectable, therefore a stand, that visibly seems to be in healthy condition, may actually be altered by several pathogens. The aim of this paper is to evaluate the health condition of managed 80 – 105 year old pine stands growing at fertile (oxalis and oxalis-vaccinium vitis-idaea) sites and to detect, whether it is possible to decide about its viabilty by visible assession. In order to evaluate the state of certain pine stands, healthy trees, standing dead trees and trees with defects from eight permanent sample plots were assessed. The trees were drilled with resistograph at root collar and breast height, in order to detect possible rotting. Study showed, that evaluated stands were more affected by diseases than presumed by visible assession, therefore it can be said that the health of pine stands at oxalis and oxalis-vaccinium vitis-idaea forest site can not be determined only by visual assessment. More realistic assessment of stand’s and trees health is important in order to predict the growth of forest development and possible losses of trees as well as draft better prognosis models. This kind of research, with an aim to verify visible assessment of stand`s health at permanent forest growth plots with resistograph has not been conducted before.
Pine stands growing at fertile site types are more affected by root-rot causing fungi than pine stands that grow at less fertile site types. Fungal diseases are often not easily detectable, therefore a stand, that visibly seems to be in healthy condition, may actually be altered by several pathogens. The aim of this paper is to evaluate the health condition of managed 80 – 105 year old pine stands growing at fertile (oxalis and oxalis-vaccinium vitis-idaea) sites and to detect, whether it is possible to decide about its viabilty by visible assession. In order to evaluate the state of certain pine stands, healthy trees, standing dead trees and trees with defects from eight permanent sample plots were assessed. The trees were drilled with resistograph at root collar and breast height, in order to detect possible rotting. Study showed, that evaluated stands were more affected by diseases than presumed by visible assession, therefore it can be said that the health of pine stands at oxalis and oxalis-vaccinium vitis-idaea forest site can not be determined only by visual assessment. More realistic assessment of stand’s and trees health is important in order to predict the growth of forest development and possible losses of trees as well as draft better prognosis models. This kind of research, with an aim to verify visible assessment of stand`s health at permanent forest growth plots with resistograph has not been conducted before.
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