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Maryam Kazempour Larsary

Maryam Kazempour Larsary

PhD student in Forest ecology

About

13
Publications
2,552
Reads
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34
Citations
Citations since 2017
13 Research Items
34 Citations
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201720182019202020212022202305101520
201720182019202020212022202305101520

Publications

Publications (13)
Article
Full-text available
Data capturing multiple axes of tree size and shape, such as a tree's stem diameter, height and crown size, underpin a wide range of ecological research - from developing and testing theory on forest structure and dynamics, to estimating forest carbon stocks and their uncertainties, and integrating remote sensing imagery into forest monitoring prog...
Article
Forests are the major components of global carbon (C) cycling, and hence, it is crucial to explore the drivers of forest functions related to C sequestration. Here, using the multiple linear regressions models (MLMs) and structural equation models (SEMs), we evaluated how abiotic (i.e., soil nutrients and topography) and biotic [i.e., functional tr...
Article
Full-text available
The influences of trait diversity (i.e., the niche complementarity effect) and functional composition (i.e., the mass ratio effect) on aboveground biomass (AGB) is a highly debated topic in forest ecology. Therefore, further studies are needed to explore these mechanisms in unstudied forest ecosystems to enhance our understanding, and to provide gu...
Article
It is generally well-explored that overstorey stratum regulates understorey stratum through the dominant role over the available resources in forests. However, the relationships amongst topography, soil nutrients, species diversity, tree-size dimension inequality and aboveground carbon (AGC) stock across forest strata remain debated in forest ecosy...
Article
Full-text available
Spatial patterns of trees and their interactions specifically reflect mortality, gap creation, resource use, and also determine population dynamics such as seed dispersal, understory development, initial survival and establishment, growth, and competition. In this study, three one-hectare sample plots in the three stages of early development, matur...
Conference Paper
Full-text available
Identification and assessment of quantitative characteristics of forest communities are the basic components of forest planning. In order to investigate the height frequency distribution of trees in the uneven-aged mixed stands, height of 248 trees in a sample plot of one hectare (100 m × 100 m) were measured. Beta, Johnson’s SB, Gamma, Weibull and...
Conference Paper
Full-text available
This research was conducted to study the spatial patterns and spatial associations of trees in different height classes in mixed broad-leaved stands. Data collection was done using selected one-hectare square (100 m × 100 m) plots. We recorded species and height of all trees with DBH > 7.5 cm, which fully mapped. Then the measured trees were divide...
Conference Paper
Full-text available
Studying the spatial patterns, inter and intra-specific associations of tree species may provide valuable insights into processes and mechanisms that maintain species coexistence. In this study, a one-hectare (100 m × 100 m) plot was selected in mixed broadleaf stands. we positioned all trees with a diameter at breast height (DBH) larger than 7.5 c...
Conference Paper
Full-text available
The temperate broadleaf hyrcanian forests in north of Iran, due to having high variety of fauna and flora are entitled to great importance. Study and evaluation of the changes of the structure of this forests in maintaining, developing and guiding the ecosystem towards the desired objectives is being helpful. Statistical distributions are important...
Conference Paper
Full-text available
The northern Alborz forests are considered part of the world ancient forests that are very rich in terms of number and variety of the species. Knowledge of the spatial pattern of existing species in forests is the most visible aspects of forest stand structure, Specification of particular functioning, description of ecosystem stability, preparation...
Article
Full-text available
Identification and assessment of quantitative characteristics of forest communities are the basic components of forest planning. Modeling frequency distributions of tree parameters such as diameter and height in various fields of forest sciences, including forest management, silviculture and forest biometrics plays an important role. The objective...
Article
Full-text available
This research was conducted to study the spatial patterns, inter and intra-specific associations of tree species that may provide valuable insights into processes and mechanisms that maintain species coexistence. Data collection was done using three one-hectare (100 m × 100 m) plots from three development stages (initial, optimal and decay) in an i...
Article
Full-text available
Mixed beech (Fagus orientalis Lipsky) forests are very important to the Hyrcanian region of Iran because of their high degree of naturalness and as a source of wood production. Determination of tree spatial patterns over development stages is a first step in understanding underlying processes driving regeneration and forest dynamics. Spatial patter...

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Project (1)
Archived project
Knowledge of the structure condition and recognition of the evolution process of natural forest have been imperative and could be used as a suitable pattern for applying management in stands with same characteristics based on close to nature silvicultural interventions. For this purpose, three sample plots of one hectare (100m×100m) at three development stages of initial, optimal and decay in compartment No. 401, district No. 4 in watershed No. 23 from south west of the Hyrcanian forests, northern Iran were selected. Type of species and diameter at breast height (DBH) of all trees >7.5 cm, total height, bole height and crown cover diameters were assessed. In addition, coordinates of all trees using azimuth-distance method, were recorded and fully mapped. All of the measured trees were divided into four classes based on their diameter at breast height as small, medium, large, and extra large timbers. A transect (10 m ×100m) was selected along the north-south to study the structure (vertical and horizontal profile) of the stand at each plot. Evaluation of common probability distribution functions were fitted to the stem number distribution in diameter classes for using Mathwave software. Spatial patterns of all trees, spatial associations among tree size classes (Intra-specific) and among species (Inter-specific) were analyzed using univariate and bivariate Ripley’s K-function. Results indicated that there were two to three storied stands in the studied plots. The maximum individuals of stem number (74%) was computed in small timber in the initial stage, while the maximum of volume (41%) for extra large timber was found in the decay stage. Description of diameter and volume structure using the structure triangle showed the different results. In addition, results revealed that; 1) for initial stage, three-parameter log-normal 2) for optimal stage, three-parameter weibull 3) and for decay stage, Johnson’s SB have been fitted. The results indicated that, while the number of stems decreases from initial stage toward decay stage, the spatial pattern of trees in initial, optimal and decay stages are aggregated, random and highly random, respectively. Differences in spatial patterns among the development stages with the gap-dynamics paradigm, positive or negative interaction patterns (i.e., attraction and repulsion) among regenerations are not unexpected. Interactions between diameter size classes showed that whole of trees and so beech trees with different sizes had different positive (attraction) and negative (repulsion) competitive effects which occurred at different scales based on the size of trees across different development stages, influenced by ecological nature of species, seed dispersal and intra-specific competition of trees with various diameter sizes. In addition, investigation of inter-specific competition among F. orientalis whit C. betulus and other species showed a variety of results across different development stages.