Growth patterns from different forest generations of Scots pine in Estonia

Metslaid, Sandra; Sims, Allan; Kangur, Ahto; Hordo, Maris; Jõgiste, Kalev; Kiviste, Andres; Hari, Pertti

doi:10.1007/s10310-011-0275-4

Cited by 21 publications

(10 citation statements)

References 40 publications

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“…In the case of Norway spruce in Norway, comparable trends were obtained by Sharma et al (2012), with the process of amelioration of site conditions also substantially faster in the second half of Tables as well and Tiurin's yield Tables and Bruchwald's site index model the 20th century. A similar trend was also observed in Estonia for height growth of Scots pine (Metslaid et al, 2011). The authors observed significant differences in height growth between generations of trees, stating faster growth of the younger generation of Scots pine trees.…”

Section: Discussionsupporting

confidence: 76%

Dynamic site index model and trends in changes of site productivity for Alnus glutinosa (L.) Gaertn. in southern Poland

Socha¹,

Ochał²

2017

Dendrobiology

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Black alder is naturally widespread across all of Europe and has an increasing importance for forest ecosystems. Thanks to the considerable tolerance to adverse climatic and edaphic environmental conditions black alder is important both in open landscapes and can also be involved in the rehabilitation of disturbed soils. Assessment of site productivity is essential for providing a frame of reference for silvicultural diagnosis and prescription in order to ensure the sustainability of existing and newly established ecosystems. The most accepted method of evaluating site productivity is the site index (SI). The aim of the presented research was to develop the SI model for black alder in southern Poland. The developed SI model was used as a tool in order to test the research hypothesis assuming the increase in site productivity for black alder in southern Poland. The research material for development of SI model were stem analysis data from 180 research plots. Both, the local model parameter, which was estimated individually for every tree, and the other parameters estimated globally for the whole data set were estimated simultaneously. Changes in site productivity were analyzed on research plots and a set of 12,974 stands from the forest inventory database. Site indices calculated using the developed model are negatively correlated with age/ positively correlated with establishment year of the stands. This confirms the existence of the phenomenon of increasing site productivity for black alder. During the last century site productivity measured with site index increased on average 5 m. Therefore, black alder that belongs to the fast-growing tree species should be considered of the increasing importance for forest management.

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Section: Discussionsupporting

confidence: 76%

Dynamic site index model and trends in changes of site productivity for Alnus glutinosa (L.) Gaertn. in southern Poland

Socha¹,

Ochał²

2017

Dendrobiology

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“…The H Px increment was greater in younger stands compared to older forests, and this difference was similarly present in both the leaf-off and leaf-on datasets, although the H Px values in the leaf-off dataset were systematically lower. This finding agrees well with existing knowledge of forest growth in Estonia (Kängsepp, Kangur, & Kiviste, 2015;Metslaid et al, 2011). We also found a smaller height increment estimate for the reference stands compared to the stands that were thinned, which can be explained by higher soil fertility in the sample of thinned stands.…”

Section: Discussionsupporting

confidence: 92%

Thinning- and tree-growth-caused changes in canopy cover and stand height and their estimation using low-density bitemporal airborne lidar measurements – a case study in hemi-boreal forests

Arumäe

Lang

Laarmann

2020

European Journal of Remote Sensing

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Repeated airborne laser scanning (ALS) measurements during leaf-on and leaf-off phenophases were studied. A 15 km × 15 km test site located in northern Estonia was used that included a reference set of stands, and 870 stands with thinning carried out before, between, and after two ALS flights. The decrease in ALS-based canopy cover estimate (CC ALS ) caused by thinning was similar for the leaf-off and leaf-on phenophases, and for different height thresholds. The point cloud height percentile (H Px ) values increased in almost all thinned stands, and the increase was present for the leaf-off and leaf-on phenophases. ALS point cloud metrics (skewness, kurtosis, mode, and canopy relief ratio) showed no response to thinning (p-value >0.05). Stand-dominating species had no significant influence on H Px increment or CC ALS change using the leaf-on data (p-value >0.05). The minimum height filter for pulse return selection had a substantial influence on H Px increment in stands thinned between the two ALS measurements. Ground points are usually excluded from H Px calculation, but for stand-level analyses, their inclusion can provide additional information. ARTICLE HISTORY

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“…The average height increment in young forests (< 20 years) in Estonia is about 0.5 m per year depending on soil fertility (Käng sepp et al, 2015). For older forests, the height increment is usually smaller (0.3 m per year) depending also on soil fertility and forest age (Metslaid et al, 2011). Over four years, i.e.…”

Section: Discussionmentioning

confidence: 99%

Assessment of forest thinning intensity using sparse point clouds from repeated airborne lidar measurements

Lang

Arumäe

2018

Forestry Studies

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Thinning cuttings create moderate disturbances in forest stands. Thinning intensity indicates the amount of felled wood relative to the initial standing volume. We used sparse point clouds from airborne lidar measurements carried out in 2008 and 2012 at Aegviidu test site, Estonia, to study stand level relationships of thinning intensity to the changes in canopy cover and ALS-based wood volume estimates. Thinning intensity (Kr, HRV) was estimated from forest inventory data and harvester measurements of removed wood volume. The thinning intensity ranged from 17% to 56%. By raising threshold from 1.3 m to 8.0 m over ground surface we observed less canopy cover change, but stronger correlation with thinning intensity. Correlation between ALS-based and harvester-based thinning intensity was moderate. The ALS-based thinning intensity estimate was systematically smaller than Kr, HRV. Forest height growth compensates for a small decrease in canopy cover and intensity estimates for weak thinnings are not reliable using sparse point clouds and a four-year measurement interval.

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Growth patterns from different forest generations of Scots pine in Estonia

Cited by 21 publications

References 40 publications

Dynamic site index model and trends in changes of site productivity for Alnus glutinosa (L.) Gaertn. in southern Poland

Dynamic site index model and trends in changes of site productivity for Alnus glutinosa (L.) Gaertn. in southern Poland

Thinning- and tree-growth-caused changes in canopy cover and stand height and their estimation using low-density bitemporal airborne lidar measurements – a case study in hemi-boreal forests

Assessment of forest thinning intensity using sparse point clouds from repeated airborne lidar measurements

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