Fengri Li
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View article: Evaluating the effectiveness of forest type stratification for aboveground biomass inference
Evaluating the effectiveness of forest type stratification for aboveground biomass inference Open
Accurate quantification of aboveground biomass (AGB) in heterogeneous forest ecosystems is critical for reliable carbon cycle modeling and the effective climate policy development. Although remote sensing-assisted methods have significantl…
View article: Effects of additive or multiplicative error structures on self-thinning lines for larch plantations in northeast China
Effects of additive or multiplicative error structures on self-thinning lines for larch plantations in northeast China Open
Accurately modeling the self-thinning line is crucial for effective forest management, yet the debate continues on whether to use nonlinear regression with additive error on the arithmetic scale or linear regression with multiplicative err…
View article: A hybrid method for tree-level forest planning
A hybrid method for tree-level forest planning Open
Forest inventory is increasingly producing information on the locations and sizes of individual trees. This information can be acquired by airborne or terrestrial laser scanning or analyzing photogrammetric data. However, all trees are sel…
View article: Adaptive optimisation of the management of Korean pine plantation
Adaptive optimisation of the management of Korean pine plantation Open
Forest management planning faces uncertainties regarding future timber prices, tree growth, and survival. Future seed production is an additional source of uncertainty in Korean pine stands managed for the joint production of timber and ed…
View article: Assessing effects of thinning on the stem form in larch during the stand initiation and stem exclusion stages using terrestrial laser scanning
Assessing effects of thinning on the stem form in larch during the stand initiation and stem exclusion stages using terrestrial laser scanning Open
Forest management is vital to the growth and development of trees at different stages. However, comprehensively capturing tree attributes to determine the response to management remains a major challenge. Therefore, this study utilized TLS…
View article: Unraveling the individual and interactive effects of climate and competition on branch growth dynamics in Pinus koraiensis in Northeast China
Unraveling the individual and interactive effects of climate and competition on branch growth dynamics in Pinus koraiensis in Northeast China Open
Introduction The quantitative modeling of dynamic branch growth in Korean pine ( Pinus koraiensis ) and the analysis of the factors influencing branch growth are essential prerequisites for making scientifically sound management decisions …
View article: Effects of biotic and abiotic factors on ecosystem multifunctionality of plantations
Effects of biotic and abiotic factors on ecosystem multifunctionality of plantations Open
Background Mixed forests are better than monoculture forests in biodiversity, stand structure and productivity stability. However, a more comprehensive assessment of the ecosystem functions of monoculture and mixed plantations is lacking. …
View article: Stochastic Optimization of the Management Schedule of Korean Pine Plantations
Stochastic Optimization of the Management Schedule of Korean Pine Plantations Open
Korean pine is one of the most important tree species in northeastern China, where Korean pine plantations produce timber and edible seeds. Often, seeds create more income than timber. Predicting the timber and cone yields of alternative m…
View article: Competition is critical to the growth of Larix gmelinii and Betula platyphylla in secondary forests in Northeast China under climate change
Competition is critical to the growth of Larix gmelinii and Betula platyphylla in secondary forests in Northeast China under climate change Open
Individual tree growth is facilitated by biotic and abiotic variables and their interactions. Understanding the relationships between biotic and abiotic variables is critical for tree growth research. By using the random forest model for v…
View article: Main drivers of vertical and seasonal patterns of leaf photosynthetic characteristics of young planted <i>Larix Olgensis</i> trees
Main drivers of vertical and seasonal patterns of leaf photosynthetic characteristics of young planted <i>Larix Olgensis</i> trees Open
Photosynthetic characteristics of tall trees play important roles in improving the accuracy of ecosystem models, but they are laborious to be accurately measured or estimated owing to the influence of multiple factors. To clarify the main …
View article: An innovative lightweight 1D-CNN model for efficient monitoring of large-scale forest composition: a case study of Heilongjiang Province, China
An innovative lightweight 1D-CNN model for efficient monitoring of large-scale forest composition: a case study of Heilongjiang Province, China Open
Large-scale forest composition mapping and change monitoring are essential for regional and national forest resource management, monitoring, and carbon stock assessment. However, the existing large-scale mapping methods are not effective e…
View article: Quantifying the Profiles of Heartwood, Sapwood, and Bark Using a Seemingly Unrelated Mixed-Effect Model for Larix Olgensis in Northeast China
Quantifying the Profiles of Heartwood, Sapwood, and Bark Using a Seemingly Unrelated Mixed-Effect Model for Larix Olgensis in Northeast China Open
Heartwood, sapwood, and bark constitute the main components of the tree stem. The stem is the main component of the tree and plays an important role in supporting the tree and transporting nutrients and water. Therefore, quantifying the pr…
View article: Developing Weibull-based diameter distributions for the major coniferous species in Heilongjiang Province, China
Developing Weibull-based diameter distributions for the major coniferous species in Heilongjiang Province, China Open
Diameter distribution models play an important role in forest inventories, growth prediction, and management. The Weibull probability density function is widely used in forestry. Although a number of methods have been proposed to predict o…
View article: Effects of Biotic and Abiotic Factors on Biomass Conversion and Expansion Factors of Natural White Birch Forest (Betula platyphylla Suk.) in Northeast China
Effects of Biotic and Abiotic Factors on Biomass Conversion and Expansion Factors of Natural White Birch Forest (Betula platyphylla Suk.) in Northeast China Open
Biomass conversion and expansion factors (BCEFs) are widely utilized in national and regional biomass estimates and greenhouse gas reporting, as they can be used to directly transform the stocking volume into biomass. In this study, the po…
View article: An innovative lightweight 1D-CNN model for efficient monitoring of large-scale forest composition: a case study of Heilongjiang Province, China
An innovative lightweight 1D-CNN model for efficient monitoring of large-scale forest composition: a case study of Heilongjiang Province, China Open
Large-scale forest composition mapping and change monitoring are essential for regional and national forest resource management, monitoring, and carbon stock assessment. However, the existing large-scale mapping methods are not effective e…
View article: A Comparison of Four Methods for Automatic Delineation of Tree Stands from Grids of LiDAR Metrics
A Comparison of Four Methods for Automatic Delineation of Tree Stands from Grids of LiDAR Metrics Open
Increased use of laser scanning in forest inventories is leading to the adoption and development of automated stand delineation methods. The most common categories of these methods are region merging and region growing. However, recent lit…
View article: Predicting Individual Tree Diameter of Larch (Larix olgensis) from UAV-LiDAR Data Using Six Different Algorithms
Predicting Individual Tree Diameter of Larch (Larix olgensis) from UAV-LiDAR Data Using Six Different Algorithms Open
Individual tree detection is an increasing trend in LiDAR-based forest inventories. The locations, heights, and crown areas of the detected trees can be estimated rather directly from the LiDAR data by using the LiDAR-based canopy height m…
View article: Two-level optimization approach to tree-level forest planning
Two-level optimization approach to tree-level forest planning Open
Laser scanning and individual-tree detection are used increasingly in forest inventories. As a consequence, methods that optimize forest management at the level of individual trees will be gradually developed and adopted. The current study…
View article: Stand Volume Growth Modeling with Mixed-Effects Models and Quantile Regressions for Major Forest Types in the Eastern Daxing’an Mountains, Northeast China
Stand Volume Growth Modeling with Mixed-Effects Models and Quantile Regressions for Major Forest Types in the Eastern Daxing’an Mountains, Northeast China Open
The relative growth rate (RGRnv) is the standardized measurement of forest growth, whereby excluding the size differences between individuals allows their performance to be compared equally. The RGRnv model was developed using the National…
View article: Predicting Height to Crown Base of Larix olgensis in Northeast China Using UAV-LiDAR Data and Nonlinear Mixed Effects Models
Predicting Height to Crown Base of Larix olgensis in Northeast China Using UAV-LiDAR Data and Nonlinear Mixed Effects Models Open
As a core content of forest management, the height to crown base (HCB) model can provide a theoretical basis for the study of forest growth and yield. In this study, 8364 trees of Larix olgensis within 118 sample plots from 11 sites were m…
View article: Developing distance-dependent growth models from irregularly measured sample plot data – A case for Larix olgensis in Northeast China
Developing distance-dependent growth models from irregularly measured sample plot data – A case for Larix olgensis in Northeast China Open
The need for distance-dependent individual-tree models for diameter increment and survival is increasing due to the increased use of individual-tree detection in forest inventories based on remote sensing data. Distance-dependent models ca…
View article: Biomass Functions and Carbon Content Variabilities of Natural and Planted Pinus koraiensis in Northeast China
Biomass Functions and Carbon Content Variabilities of Natural and Planted Pinus koraiensis in Northeast China Open
The population of natural Korean pine (Pinus koraiensis) in northeast China has sharply declined due to massive utilization for its high-quality timber, while this is vice versa for Korean pine plantations after various intensive afforesta…
View article: Segmented taper models form for Manchurian fir and Korean spruce in northeastern China
Segmented taper models form for Manchurian fir and Korean spruce in northeastern China Open
Background: Manchurian fir (Abies nephrolepis Maxim) and Korean spruce (Picea koraiensis Nakai) are primary conifer species of economic and ecological importance in northeast China. Several taper studies have analyzed for fir and spruce sp…