Modelling potential yield capacity in conifers using Swedish long-term experiments

Mensah, Alex Appiah; Holmström, Emma; Nyström, Kenneth; Nilsson, Urban

doi:10.1016/j.foreco.2022.120162

Cited by 8 publications

(6 citation statements)

References 41 publications

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“…It is also important to note that the use of tree height (ascertained through the height-age site index approach) does not fully explain between-site differences in productivity. In other words, even if we have a certain site index, there may be significant variation in the woody volume of the plot due to differences in carrying capacity, species composition, and site properties 10 , 13 , 42 , 43 . Thus, we postulate that additional information to height differences, such as species, basal area, or volume, may improve both site index or site quality estimates 13 .…”

Section: Discussionmentioning

confidence: 99%

“…The fraction of a site’s growth potential that is realised by trees to produce a certain amount of volume is often quantitatively expressed as site productivity. This type of information is critical for forest management planning as it provides the context for projecting forest production over a certain period 10 and supports decision-making concerning both conservation and restoration efforts 11 . As such, landscape-scale information on the variation in forest site productivity can significantly improve forest management 12 and enhance understanding of which biotic factors influence forest growth within the landscape.…”

Section: Introductionmentioning

confidence: 99%

“…and Betula pubescens Ehrh . ) 10 , 14 , 15 . This method of estimating site index is denoted as SIH.…”

Section: Introductionmentioning

confidence: 99%

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Tree growth potential and its relationship with soil moisture conditions across a heterogeneous boreal forest landscape

Larson,

Vigren,

Wallerman

et al. 2024

Sci Rep

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Forest growth varies across landscapes due to the intricate relationships between various environmental drivers and forest management. In this study, we analysed the variation of tree growth potential across a landscape scale and its relation to soil moisture. We hypothesised that soil moisture conditions drive landscape-level variation in site quality and that intermediate soil moisture conditions demonstrate the highest potential forest production. We used an age-independent difference model to estimate site quality in terms of maximum achievable tree height by measuring the relative change in Lorey’s mean height for a five year period across 337 plots within a 68 km2 boreal landscape. We achieved wall-to-wall estimates of site quality by extrapolating the modelled relationship using repeated airborne laser scanning data collected in connection to the field surveys. We found a clear decrease in site quality under the highest soil moisture conditions. However, intermediate soil moisture conditions did not demonstrate clear site quality differences; this is most likely a result of the nature of the modelled soil moisture conditions and limitations connected to the site quality estimation. There was considerable unexplained variation in the modelled site quality both on the plot and landscape levels. We successfully demonstrated that there is a significant relationship between soil moisture conditions and site quality despite limitations associated with a short study period in a low productive region and the precision of airborne laser scanning measurements of mean height.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tree growth potential and its relationship with soil moisture conditions across a heterogeneous boreal forest landscape

Larson,

Vigren,

Wallerman

et al. 2024

Sci Rep

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“…Since the seminal theory by [12], which postulated a direct relationship between stand height and standing volume, the site index-defined as the height attained by the stand at a given age-has traditionally served as an indicator of potential productivity and site quality [13]. Site index curves have traditionally been constructed using height growth dynamic models [14,15], which depict the pattern of height growth with age throughout the lifespan of the tree or stand.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Height Growth Equations and Site Index-Based Biomass Models for Young Native Species Afforestations in Spain

Calama,

Madrigal,

del Río

et al. 2024

Forests

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The expansion of forested areas through afforestation and reforestation is widely recognized as a highly effective natural solution for mitigating climate change. Accurately assessing the potential carbon uptake capacity of newly afforested areas requires modelling tools to estimate biomass stocks, including site index curves and biomass models. Given the unique conditions in terms of tree size, uniform spacing, and tree allometries observed in young afforestations compared to natural stands, specific tools are necessary. In Spain, over 800,000 ha has been afforested with native forest species since 1992, but specific modelling tools for these plantations are lacking. Using data from 370 stem analyses collected across an extensive network of plots in young afforestations, we developed dynamic height growth and site index models for the main native species (five pines and five oaks) commonly used in afforestation in Spain. We compared various nonlinear models, such as ADA (algebraic difference approach) and GADA (generalized algebraic difference approach) expansions. The developed site index models were then used to predict the total biomass stored in the afforestation. Our results underscore the necessity for specific site index models tailored to afforestations, as well as the potential of the established site index in predicting biomass and carbon fixation capacity in these young forests.

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“…Based on the concept of basal area potential productivity and volume potential productivity, this study proposes a biomass potential productivity that is applicable to multi-aged and multi-layered mixed forests [24,25]. The methods of forest site quality evaluation presented in this study can provide practical guidance for scientific forest management [26,27]. The ninth national forest resources inventory in the Jilin Province, which is one of the key provinces for forest development in China [28], shows that the forest area is 7.85 million hectares, and the standing volume is 101.296 million cubic meters.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Forest Site Quality Using the Biomass Potential Productivity Approach

Yan,

Feng,

Sharma

et al. 2023

Forests

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Biomass productivity is of great significance for the evaluation of forest quality, which is important for the improvement of forest management. We propose the computational methods of biomass potential productivity (BPP) and biomass realistic productivity (BRP), both of which provide reliable practical guides for predicting forest growth under multi-aged, multi-species, and multi-layered canopy conditions. We used 2222 national forest inventory plots that were measured in four consecutive periods in the Jilin Province for this purpose. We analyzed and verified the computational methods of BPP based on the BRP and evaluated its practical significance. The results showed that growth models of the stand height, stand basal area, and stand biomass of four forest types (pure larch forest, larch broadleaf mixed forest, Mongolian oak pure forest, and Mongolian oak broadleaf mixed forest) fit adequately, BPP was greater than BRP, and this difference decreased with an increasing stand age, suggesting that the potential productivity of the middle-aged and young forest was higher than that of the mature forest, although the difference is minimal. In addition, the realistic productivity of stands with better site quality was close to the potential productivity, which is consistent with the biological significance of the potential productivity of the biomass. The degree of difference between the potential productivity of the biomass and the realistic productivity of biomass also decreases with the decline in site quality, and it can be termed as the potentially improved stand biomass. The BPP model was able to perform well in both the pure and mixed forests. The BRP not only verifies the rationality of the BPP but can be also used to quantify the forest site quality, which is helpful for evaluating forest growth and informed decision making in forestry.

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Modelling potential yield capacity in conifers using Swedish long-term experiments

Cited by 8 publications

References 41 publications

Tree growth potential and its relationship with soil moisture conditions across a heterogeneous boreal forest landscape

Tree growth potential and its relationship with soil moisture conditions across a heterogeneous boreal forest landscape

Dynamic Height Growth Equations and Site Index-Based Biomass Models for Young Native Species Afforestations in Spain

Evaluating Forest Site Quality Using the Biomass Potential Productivity Approach

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