{"id":5092,"date":"2025-10-23T11:34:50","date_gmt":"2025-10-23T11:34:50","guid":{"rendered":"https:\/\/www.metsabiotalous.fi\/?page_id=5092"},"modified":"2026-04-16T05:44:07","modified_gmt":"2026-04-16T05:44:07","slug":"taimikonhoidon-vaihtoehdot-ja-puulajivalikoiman-monipuolistaminen","status":"publish","type":"page","link":"https:\/\/www.metsabiotalous.fi\/en\/punkaharjun-tutkimuspuisto\/metsanhoidon-mahdollisuudet\/taimikonhoidon-vaihtoehdot-ja-puulajivalikoiman-monipuolistaminen\/","title":{"rendered":"Tending options for seedling stands and Tree species diversification"},"content":{"rendered":"
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Tending options for seedling stands<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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On this site, we demonstrate the establishment of spruce-birch mixed forest in the juvenile\nstand management and compare the later development of mixed stands with that of pure\nspruce and untreated spruce stands.<\/p>

The seedling stand is growing on fertile site (OMT). The stand was clearcut in November\n2016, mounded in June 2017, planted with Norway spruce in September 2017, and early\ncleaned in October 2019. In June 2024, four treatment areas were established in the seedling\nstand: no treatment, a pure spruce stand, and two spruce-birch mixtures where birches as\ntall as or taller than spruces were left to grow. Outside these treatment areas, the seedling\nstand was managed according to the Mets\u00e4hallitus practices.<\/p>

At the seedling stage, birches can be slightly taller than spruces, ensuring good crown\ndevelopment and diameter growth in mixed stands. During precommercial thinning, it is\nimportant to monitor the density of the remaining trees to ensure that birches supplement,\nrather than increase, the overall density. Furthermore, protective thickets and important tree\nspecies such as aspen, alder, rowan and willows should be preserved as individual trees or\ngroups of trees.\nAdjacent to the precommercial thinning site is the tree species diversification site, where\na variety of tree species have been planted to enhance biodiversity. These species include\noak (Quercus robur), alder (Alnus glutinosa), larch (Larix sibirica), Douglas fir (Pseudotsuga\nmenziesii) and maple (Acer platanoides).<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\n\t\t\t\t\n\t\t\t\t\tSilviculture of mixed forests\t\t\t\t<\/span>\n\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tree species diversification<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Diversification of tree species selection increases climate\nresilience of forests<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Regeneration tree species are selected based on site fertility and soil type to ensure\noptimal use of the land's productive capacity for forest growth. To enhance biological\ndiversity and climate resilience, forest regeneration focuses on diversifying the tree\nspecies suitable for the site. Our three main tree species\u2014Scots pine, Norway spruce,\nand silver birch\u2014offer good opportunities for this, except on infertile sites suitable only\nfor pine. Species diversity can be enhanced by using different tree species in various\nregeneration areas, different parts of the regeneration area, or as mixtures.<\/p>

Planting spruce is a common method of forest regeneration as it gives good results, and\nplanting pine and silver birch involves the risk of browsing damage. However, climate\nchange makes spruce more susceptible to drought and other causes of damage. To\nadapt to climate change, it is essential to increase the diversification of tree species\nselection in forests and to select species that are suitable for the site.<\/p>

In addition to the main tree species, planting less-used tree species is an option if the\nsite is suitable. For example, planting alder on wet sites is a good alternative to planting\nspruce. Even individual trees or groups of trees can contribute to the variety of tree\nspecies and enhance the overall diversity of the forest.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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PUUVA test sites and tending options for seedling stands<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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On this site, we demonstrate how less-used tree species diversify the forest's tree\nspecies selection and compare in growth to Norway spruce (Picea abies)<\/em>.<\/p>

The stand is growing on fertile site (OMT) characterized by fine sand mineral soil.\nIn February 2023, a coniferous mixed forest of about 60 years old on this site was\nclearcut. The regeneration area was mounded by an excavator in May 2023.<\/p>

On the regeneration area, circular plots (900 m2<\/sup>) were planted with oak (Quercus\nrobur)<\/em>, alder (Alnus glutinosa)<\/em>, larch (Larix sibirica)<\/em> and Douglas fir (Pseudotsuga\nmenziesii)<\/em> in June 2023. The intermediate areas between the circular plots were\nplanted with spruce seedlings in June 2024. The species-specific planting densities\nwere: larch 1300 trees\/ha, spruce, alder and Douglas fir 1800 trees\/ha and oak 2000\ntrees\/ha. Additionally, small groups of maple (Acer platanoides)<\/em> were planted.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\n\t\t\t\t\n\t\t\t\t\tTree species diversification\t\t\t\t<\/span>\n\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Taimikonhoidon vaihtoehdot Kohteella havainnollistetaan kuusi-koivusekamets\u00e4n perustamista taimikonhoitovaiheessa ja verrataan sekapuustojen my\u00f6hemp\u00e4\u00e4 kehityst\u00e4 puhtaan kuusikon ja hoitamattoman kuusentaimikon kehitykseen. Taimikkokuvio on<\/p>","protected":false},"author":1,"featured_media":0,"parent":5005,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"acf":[],"yoast_head":"\nTaimikonhoidon vaihtoehdot ja puulajivalikoiman monipuolistaminen | Metsabiotalous<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.metsabiotalous.fi\/en\/punkaharjun-tutkimuspuisto\/metsanhoidon-mahdollisuudet\/taimikonhoidon-vaihtoehdot-ja-puulajivalikoiman-monipuolistaminen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Taimikonhoidon vaihtoehdot ja puulajivalikoiman monipuolistaminen | Metsabiotalous\" \/>\n<meta property=\"og:description\" content=\"Taimikonhoidon vaihtoehdot Kohteella havainnollistetaan kuusi-koivusekamets\u00e4n perustamista taimikonhoitovaiheessa ja verrataan sekapuustojen my\u00f6hemp\u00e4\u00e4 kehityst\u00e4 puhtaan kuusikon ja hoitamattoman kuusentaimikon kehitykseen. 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