Bernard R. Parresol's research while affiliated with Pacific Northwest Research Institute and other places

Publications (44)

Article
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Spatially explicit mapping of forest productivity is important to assess many forest management alternatives. We assessed the relationship between mapped variables and site index of forests ranging from southern pine plantations to natural hardwoods on a 74,000-ha landscape in South Carolina, USA. Mapped features used in the analysis were soil asso...
Article
Knowledge of the diameter distribution structures in forestry is an important metric for efficient management of forest resources. This study reports the fitting of empirical diameter frequency distributions in natural stands of Brutian pine in Southern Turkey. Johnson's SB function was used as the theoretical distribution. Two distinct methodologi...
Chapter
Biomass is the mass or the weight of living tissue provided by a given area or volume of the earth's surface. It is commonly subdivided into five trophic levels forming the basic food chain. In terrestrial ecosystems, the biomass distribution resembles a pyramid, where mass progressively decreases from producer to top predator. Some aquatic systems...
Article
Full-text available
Studies of spatial patterns of landscapes are useful to quantify human impact, predict wildlife effects, or describe various landscape features. A robust landscape index should quantify two components of landscape diversity: composition and configuration. One category of landscape index is the contagion index. Some landscape ecologists promote the...
Article
Based on cross-dated increment cores, yearly diameters of trees were reconstructed for 21 laurels (Cordia alliodora) growing in a natural secondary forest on Gigante Peninsula, Panama. From this sample of dominant-codominant trees, ages were 14–35 years with an average of 25 years. Growth typically slowed at 7 years old, indicating effects of compe...
Chapter
Biomass is the mass or the weight of living tissue provided by a given area or volume of the earth's surface. It is commonly subdivided into five trophic levels forming the basic food chain. In terrestrial ecosystems, the biomass distribution resembles a pyramid, where mass progressively decreases from producer to top predator. Some aquatic systems...
Article
Full-text available
Landscape-scale fire behavior analyses are important to inform decisions on resource management projects that meet land management objectives and protect values from adverse consequences of fire. Deterministic and probabilistic geospatial fire behavior analyses are conducted with various modeling systems including FARSITE, FlamMap, FSPro, and Large...
Article
In the southeastern USA, land use history, forest management and natural geomorphic features have created heterogeneous fuel loads. This apparent temporal and spatial variation in fuel loads make it difficult to reliably assess potential fire behavior from remotely sensed canopy variables to determine risk and to prescribe treatments. We examined t...
Article
Fire hazard mitigation planning requires an accurate accounting of fuel complexes to predict potential fire behavior and effects of treatment alternatives. In the southeastern United States, rapid vegetation growth coupled with complex land use history and forest management options requires a dynamic approach to fuel characterization. In this study...
Article
Changes in climate may reduce the success of natural regeneration and hence require adjustments to silvicultural practices. Special attention is required for species such as Spanish black pine (Pinus nigra Arn. ssp salzmannii) because of impediments to achieve successful natural regeneration. Spanish black pine seed germination was studied under fi...
Article
This paper presents a growth model for dominant-height and site-quality estimations for Pyrenean oak (Quercus pyrenaica Willd.) stands. The Bertalanffy–Richards function is used with the generalized algebraic difference approach to derive a dynamic site equation. This allows dominant-height and site-index estimations in a compatible way, using any...
Article
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A basal area growth system for single-species, even-aged maritime pine (Pinus pinaster Ait.) stands in Galicia (northwestern Spain) was developed from data of 212 plots measured between one and four times. Six dynamic equations were considered for analysis, and both numerical and graphical methods were used to compare alternative models. The double...
Article
Abstract Studies of spatial patterns of landscapes are useful to quantify human impact, predict wildlife effects, or describe variability of landscape features. A common approach to identify and quantify landscape structure is with a landscape scale model known as a contagion index. A contagion index quantifies two distinct components of landscape...
Article
Forest growth and yield models that describe the heterogeneity of a stand by implicitly defining size classes are valuable tools for sustainable forest management. In stand-level growth and yield models, often stand tables representing numbers of trees by diameter class are projected through the use of probability density functions (PDFs). Theoreti...
Article
We used forest inventory data, intensive tree measurement, destructive sampling in the field, and subsequent laboratory analyses to develop regression equations that estimate tree biomass, merchantable volume, and total volume for upland forests in Puerto Rican subtropical dry forest. Most parsimonious and additive biomass equations for mixed, dry...
Chapter
Biomass, the contraction for biological mass, is the amount of living material provided by a given area or volume of the earth's surface, whether terrestrial or aquatic. Biomass is important for commercial uses (e.g. fuel and fiber) and for national development planning, as well as for scientific studies of ecosystem productivity, energy and nutrie...
Article
Full-text available
Carbon accounting, forest health monitoring and sustainable management of the subtropical dry forests of Puerto Rico and other Caribbean Islands require an accurate assessment of forest aboveground biomass (AGB) and stem volume. One means of improving assessment accuracy is the development of predictive equations derived from locally collected data...
Article
Full-text available
Biomass estimation is critical for looking at ecosystem processes and as a measure of stand yield. The density-integral approach allows for coincident estimation of stem profile and biomass. The algebraic difference approach (ADA) permits the derivation of dynamic or nonstatic functions. In this study we applied the ADA to develop a self-referencin...
Article
A basal area growth system for single-species, even-aged maritime pine (Pinus pinaster Ait.) stands in Galicia (northwestern Spain) was developed from data of 212 plots measured between one and four times. Six dynamic equations were considered for analysis, and both numerical and graphical methods were used to compare alternative models. The double...
Article
Full-text available
A stochastic height-diameter model was developed for maritime pine (Pinus pinaster Ait.) in Galicia (northwestern Spain). Four well-known growth functions were initially considered in this work, however, only Schnute's function performed adequately. A set of 20 695 pairs of height-diameter measures, collected in thinned and unthinned pure and even-...
Article
Nine additive allometric equations for computing above-ground, standing biomass were developed for the plant community and for each of 18 single species typical of the Tamaulipan thornscrub of north-eastern Mexico. Equations developed using additive procedures in seemingly unrelated linear regression provided statistical efficiency in total biomass...
Article
Chestnut ink disease caused by the oomycete Phytophthora cinnamomi, a soil-borne pathogen of world-wide distribution, accounts for the majority of disease problems on chestnuts in Portugal, limiting yield in a large number of stands and impeding establishment of trees in new areas. A survey was carried out in 32 chestnut stands in the Padrela Mount...
Article
The Forest Vegetation Simulator (FVS) height prediction equations are cornerstones of the model. However, the quality and utility of this FVS function for the southern variant has been largely untested. The objective of this study was to test the Southern Variant of the Forest Vegetation Simulator (SN-FVS) prediction accuracy of the species height-...
Article
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Statistical analysis between three weighted additive biomass equations are presented for planted pine species typical of the coniferous forests of the Western Sierra Madre mountain range of Durango, Mexico. Statistical and graphical analyses were used to select the best single and multiple individual biomass component equation. Linear equations bet...
Article
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An annotated list of 38 additions to the vascular flora of Cleveland County, Arkansas is presented. Theadditionspresentedwerecollectedfrom MoroBottomsNatural Area,astate-protectedold-growth bottomland hardwood forest located in the northwest region of thecounty RESUMEN Se presenta una hsta comentada de 38 adiciones a la flora vascular de Cleveland...
Article
Full-text available
In tree biomass estimations, it is important to consider the property of additivity, i.e., the total tree biomass should equal the sum of the components. This work presents functions that allow estimation of the stem and crown dry weight components of Pyrenean oak (Quercus pyrenaica Willd.) trees. A procedure that considers additivity of tree bioma...
Article
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In Puerto Rico, an island in the West Indies, large areas of primary forest have been cut and converted to farmland or to secondary forest; subsequently the farmlands declined in fertility and were abandoned. Various tree species were planted in order to restore the degraded land and to provide timber. Teak is a species with great restoration poten...
Article
Abstract A new parameter recovery model for Johnson’s SBdistribution is developed. This latest alternative approach permits recovery of the range and both shape parameters. Previous models recovered only the two
Article
Cork, a unique biological material, is a highly valued non-timber forest product. Portugal is the leading producer of cork with 52% of the world production. Tree cork weight models have been developed for Southern Portugal, but there are no representative published models for Northern Portugal. Because cork trees may have a different form between N...
Article
Two procedures that guarantee the property of additivity among the components of tree biomass and total tree biomass utilizing nonlinear functions are developed. Procedure 1 is a simple combination approach, and procedure 2 is based on nonlinear joint-generalized regression (nonlinear seemingly unrelated regressions) with parameter restrictions. St...
Article
Two procedures that guarantee the property of additivity among the components of tree biomass and total tree biomass utilizing nonlinear functions are developed. Procedure 1 is a simple combination approach, and procedure 2 is based on nonlinear joint-generalized regression (nonlinear seemingly unrelated regressions) with parameter restrictions. St...
Article
Full-text available
Forest openings create internal patchiness and offer different habitat qualities that attract wildlife, especially herbivores, that flourish along forest edges. But intense herbivory in these openings can reduce or eliminate herbaceous and woody species and thus influence local species composition and structure of the forest. This study in an old-g...
Article
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Height-diameter model forms in earlier published papers are examined. The selection criteria used in height-diameter model forms are not reasonable when considering tree biological growth pattern. During model selection, forms for height-diameter relationships should include consideration of both data-related and reasonable biological criteria, not...
Article
There is considerable interest today in estimating the biomass of trees and forests for both practical forestry issues and scientific purposes. New techniques and procedures are brought together along with the more traditional approaches to estimating woody biomass. General model forms and weighted analysis are reviewed, along with statistics for e...
Article
Lumbering of Fitzroya cupressoides in Chile began in 1599 and continued until 1976, when the species was declared a national monument and cutting of live trees was prohibited. Today, F. cupressoides is threatened; many of the remaining stands in the coastal range appear to be declining, with a predominance of standing dead stems and patchy, sparse...
Article
The need to estimate the volume of removals occurs for many reasons, such as in trespass cases, severance tax reports, and post-harvest assessments. A logarithmic model is presented for prediction of baldcypress total stem cubic foot volume using stump diameter as the independent variable. Because the error of prediction is as important as the volu...
Article
Full-text available
Climate has not been stable in the past. Fluctuations of pine (Pinus) pollen in a 50,000-year sequence from Lake Tulane in Florida indicate that major vegetation shifts occurred during the last glacial cycle. Phases of pollen dominated by pine (indicating a wet climate) were interspersed with periods with plentiful oak (Quercus), ragweed, and marsh...
Article
USDA Forest Service Proceedings RMRS-P-41. pp 351-366.; ; AbstractâThe Savannah River Site is a Department of Energy Nuclear Defense Facility; and a National Environmental Research Park located in the upper coastal plain of South; Carolina. Prescribed burning is conducted on 15,000 to 20,000 ac annually. We modifi; ed standard forest inventory meth...

Citations

... Our results also demonstrated the efficiency of using geostatistics as a silvicultural planning tool, especially when based on the site index. Parresol et al. (2017) observed the existence of correlation between the site index and other variables with spatial variability mapped through kriging, as also obtained by the present research. The spherical, Gaussian, and exponential models presented different range values (α). ...
... The initial values of the parameters for non-linear estimation were taken from the de-transformed parameter estimate of the log-transformed model (Model 1 in Table 2.1) (Parresol, 2001b). The use of weights is necessary to address the problem of heteroscedasticity (non-constant residual variance) (de Gier, 2003;Parresol, 2001a). The different weights were obtained by iteratively finding the optimal weight that minimizes Furnival's Index. ...
Citing chapter
... Its unimodal range in S-K space is symmetric and can assume the skewness and kurtosis of all Weibull shapes and almost all Kumaraswamy unimodal shapes ( Figure 1). Johnson's SB has no closed-form CDF and can be numerically demanding Goodwin to fit and use, but it is widely deployed nonetheless (Hafley and Buford 1985, Knoebel and Burkhart 1991, Zhou and McTague 1996, Parresol 2003, Scolforo et al. 2003, Zhang et al. 2003, Rennolls and Wang 2005, Palahí et al. 2007, Fonseca et al. 2009, George and Ramachandran 2011, Mateus and Tomé 2011, Özçelik et al. 2016, Cosenza et al. 2019, Teimouri 2020. ...
... There are large areas of natural regenerated stands, originated from forest fires. Prediction of stand development was made with the simulator Modis Pinaster [22,27]. Based on the detailed data, an optimization model was developed to support forest management in these areas, where maritime pine stands are traditionally managed for their timber production, which is the most valued natural forest resource in this region. ...
... According to the National Forest Inventory (NFI -AFN 2010), maritime pine covers around 885 000 ha of land in Portugal (27% of the mainland forest area), with a wood volume of 85.8 × 10 6 m 3 and a total biomass of 49.7 × 10 6 Mg, which represents 24.8 × 10 6 Mg of sequestered carbon. Evaluation, comparison and selection of model forms and approaches were conducted with the purpose of identifying the optimal h-d model for incorporation in the MODISPINASTER growth and yield model (Fonseca 2004, Fonseca et al. 2012. Briefly, the model addresses forest growth and yield, risks (wind related) and management procedures (such as thinning and harvesting) for pure maritime pine stands. ...
... In contemporary stand management planning, selecting a tree growth function is an important task of forest science. Growth functions, which are statistical expressions of biological growth principles, form the basis for the realistic determination of stand productivity level, tree dimensions, and potential structure assortments [5][6][7]. Growth functions describe the incremental growth changes of an individual or population over time [8]. Selecting the appropriate growth functions for tree and stand modeling is important for developing growth and yield models. ...
... The national FIA program measured C in the forest floor material directly in the region and their average for South Carolina was about 15% less than ours [56]. Although within the range of error, we believe that the difference between the FIA measured C content and our conversion factor of 0.5 may partially account for this difference [57]. We would expect that the understory and forest floor layers will contribute less in the future to the NBP and C stocks at the SRS as a result of an increased age of the stands and the application of prescribed fire. ...
... Even when all equated statistics are within range, the likelihood of a successful PRM solution decreases substantially with the number of simultaneous nonlinear equations (Press et al. 2007, Chapter 9). Theoretically, a 4-parameter model can be recovered with a set of four simultaneous equations (known as a 4-dimensional or 4-D set), but I found no 4-D PRMs for diameter distributions in the literature, and even solutions for 3-D nonlinear sets have high failure rates unless solution algorithms are well conditioned (Parresol 2003, Fonseca et al. 2009, Parresol et al. 2010, Özçelik et al. 2016, Goodwin 2021. Consequently, PRM solutions for the 4-parameter Kumaraswamy and Johnson's SB models often assume one or both bounds, and I found only two methods that recovered all four parameters objectively and tractably while enforcing consistency for G; they are the methods of Hill et al. (1976) and Fonseca, Marques, and Parresol (2009), both described for Johnson's SB parameter estimation and with maximum PRM dimensions of 2-D and 3-D, respectively. ...
... We used seemingly unrelated regression (SUR) to develop allometric equations for each component biomass because they are more accuracy and flexible (Dong et al. 2014), and permit that each component model can have its own independent variable (s) and each model can use its own weighting function to achieve heteroscedasticity, thus reducing a lower variance for the total tree biomass model (Parresol 2001). At the same time, we used SUR to establish allometric equations for above-ground and total biomass, and verified the additivity among tree biomass components (Figs. ...
... The second approach to spatial entropy includes space based on a suitable transformation of the study variable to account for the distance between realizations (co-occurrences); the first proposal was made by O'Neill et al. (1988) for contiguous couples of realizations, then extended by Leibovici (2009) and Leibovici et al. (2014) to further distances and general degrees of co-occurrences. Contagion indices (Li and Reynolds, 1993;Parresol and Edwards, 2014) are also based on this view: spatial contagion is the opposite of entropy. As for the third approach, a set of spatial entropy measures has been presented by Altieri et al. (2018aAltieri et al. ( , 2019a, starting from the co-occurrence approach but overcoming some undesirable features of the previous measures. ...