Revista Chapingo Serie Ciencias Forestales y del Ambiente
Universidad Autónoma Chapingo
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Revista Chapingo Serie Ciencias Forestales y del Ambiente
Volume XXVI, issue 2, Articles in press 2020
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Radial growth in Pinus patula Schltdl. & Cham. and its relationship with growing space and climatic factors
Crecimiento radial en Pinus patula Schltdl. & Cham. y su relación con el espacio de crecimiento y los factores climáticos
Luz M. Reyes-Cortés; J. Jesús Vargas-Hernández; Arnulfo Aldrete; Armando Gómez-Guerrero; J. Amador Honorato-Salazar
http://dx.doi.org/10.5154/r.rchscfa.2019.04.036
Received: 2019-04-22
Accepted: 2019-11-27
Available online: 2020-02-25 / pages -

  • Introduction: Annual variation in growth ring characteristics has an impact on productivity and wood quality.
    Objective: To evaluate radial growth in two Pinus patula Schltdl. & Cham. plantations of different ages and thinning intensity, as well as its relationship to interannual variation in temperature and rainfall.
    Materials and methods: Growth ring characteristics were analyzed in wood samples from 13- and 23-year-old plantations, subjected to three thinning intensities (null, light and moderate). The characteristics were related to climate data during the years of ring formation using Pearson's correlation analysis.
    Results and discussion: In the 1995 plantation, ring characteristics did not show significant differences (P > 0.10) between plots with and without thinning, due to excessive competition and crown recession. Ring width, and early and latewood width, was significantly associated (P < 0.10; r ≥ 0.40) with average minimum temperature. In the 2005 plantation, trees from the thinned plots showed greater ring width, earlywood width and basal area increment than those from the unthinned plot. In this plantation only latewood width was positively associated (P < 0.10; r = 0.69) with temperature and negatively (P < 0.10; r = -0.61) with annual rainfall.
    Conclusion: Growing space and competition intensity mainly affected ring and earlywood width. Environmental factors influence ring characteristics.

Growth and secondary metabolites of Stevia pilosa Lag. in three edaphoclimatic conditions in the state of Hidalgo, Mexico
Crecimiento y metabolitos secundarios de Stevia pilosa Lag. en tres condiciones edafoclimáticas en el estado de Hidalgo, México
José C. Romero-Figueroa; María de las Nieves Rodríguez-Mendoza; Ma. del Carmen Gutiérrez-Castorena; José Alberto Salvador Escalante-Estrada; Cecilia Beatriz Peña-Valdivia; José Antonio Cueto-Wong
http://dx.doi.org/10.5154/r.rchscfa.2019.04.026
Received: 2019-04-06
Accepted: 2020-01-16
Available online: 2020-02-25 / pages -

  • Introduction: The distribution of Stevia pilosa Lag. and its metabolite content with therapeutic properties have been documented; however, there are no reports of in situ development and factors influencing plant growth.
    Objective: To quantify the growth and phytochemical and nutrient content of S. pilosa plants in situ under three edaphoclimatic conditions in the state of Hidalgo, Mexico.
    Materials and methods: At the three sites called Huasca de Ocampo (HO), Mineral del Chico (MCh) and Mineral del Monte (MM), with different climates, soil types and elevation ranges, soil was collected and three plant samplings were carried out to follow the development of the species. 
    Results and discussion: The number of plants varied according to the sampling sites, being higher in MCh (12 plants·m-2). Growth rate and leaf area were directly related. In MCh and MM plants, net photosynthesis only supplied the demand in the first two samplings, where there was significant accumulation (P ≤ 0.05) of matter, while in HO it supplied all the samplings. MCh and HO plants had a higher nutrient concentration (P ≤ 0.05). MCh and MM plants showed a higher concentration of phenols and flavonoids, and HO plants stood out in total terpenes. 
    Conclusions: The edaphoclimatic conditions at the three sites in the state of Hidalgo modified the presence, form of growth and development of S. pilosa. 

Análisis regional de los factores del cambio de cobertura del bosque de encino (Quercus sp.) en la región Tehuacán-Cuicatlán, México  
Análisis regional de los factores del cambio de cobertura del bosque de encino (Quercus sp.) en la región Tehuacán-Cuicatlán, México  

http://dx.doi.org/10.5154/r.rchscfa.2019.04.027
Received: 2019-04-06
Accepted: 2020-01-17
Available online: 2020-02-25 / pages -

Analysis of the physical work environment in sawmills in El Salto, Durango, Mexico
Análisis del ambiente físico del trabajo en aserraderos de El Salto, Durango, México

http://dx.doi.org/10.5154/r.rchscfa.2019.04.035
Received: 2019-04-22
Accepted: 2020-01-24
Available online: 2020-02-25 / pages -

  • Introduction:  Sawmill  workers  carry  out  their  work  in  an  adverse  physical  environment  that  influences their well-being, not knowing if safety levels in the area are acceptable. 
    Objective: To analyze workers’ exposure to noise, thermal comfort, and lighting at five workstations in six sawmills in the El Salto region of Durango, Mexico. 
    Materials and methods: The physical variables of the work environment were measured directly at three times of the day for seven workdays at five workstations (forklift, edger, swing saw, resaw, and  head  saw).  The  maximum  allowable  time  of  exposure  to  noise,  thermal  comfort  through  effective  temperature,  and  lighting  of  the  work  area  were  determined.  Statistical  differences  in  physical variables between workstations, sawmills and times of the day were detected by analysis of variance and Kruskal-Wallis median range comparison tests.
    Results  and  discussion:  The  noise  level  (85  to  102  dB[A])  represents  a  greater  hearing  risk  at  the  head  saw,  resaw  and  swing  saw  workstations  as  it  exceeds  90  dB  (A).  Thermal  comfort  was  20  °C,  which  ensures  that  the  worker  can  be  exposed  100  %  of  the  time  of  the  workday  to  this  temperature. Lighting levels were high, exceeding 2,000 lx. 
    Conclusions: The noise and lighting levels are high in the assessed sawmills and pose a risk to the safety of workers if the mandatory use of ear and eye protectors is not monitored.

Sistemas de ecuaciones de altura-diámetro-edad para Pinus arizonica Engelmann y Pinus durangensis Martínez en rodales mezclados de Durango, México
Sistemas de ecuaciones de altura-diámetro-edad para Pinus arizonica Engelmann y Pinus durangensis Martínez en rodales mezclados de Durango, México

http://dx.doi.org/10.5154/r.rchscfa.2019.07.057
Received: 2019-07-05
Accepted: 2020-01-31
Available online: 2020-02-25 / pages -

Modeling of landslide sensitive areas using GIS in semi-arid forests and evaluation in terms of forest rehabilitation
Modelación de áreas susceptibles a deslizamientos de tierra utilizando SIG en bosques semiáridos y evaluación en términos de rehabilitación del bosque

http://dx.doi.org/10.5154/r.rchscfa.2019.07.054
Received: 2019-07-01
Accepted: 2020-03-17
Available online: 2020-02-25 / pages -

  • Introduction: In order to increase, protect, and sustain forest assets, it is important to determine the  factors  that  affect  forestry  activities  and  minimize  their  impact.  In  this  study,  the  landslide  factor in forestry applications was tackled. The negative effect of unpredictable factors of forestry activities  (road  construction,  harvesting,  afforestation,  etc.)  can  be  reduced  by  calculating  and  modeling the landslide susceptibility ratios of degraded forests.
    Objective:  To  demonstrate  the  applicability  of  a  landslide  susceptibility  map  for  supporting  decision  makers  in  the  assessment  of  semi-arid  and  landslide-sensitive  forestlands  in  forestry  activities and rehabilitation works.
    Materials  and  method:  Six  models  were  introduced  by  using  the  fuzzy  inference  system  (FIS)  and modified analytical hierarchy process (M-AHP) approaches. A combination of elevation, slope (degree), distance to faults, lithology, aspect, and plan curvature was used in the models.
    Results and discussion: The most successful models under the FIS and M-AHP approaches were FIS Model 3, and M-AHP Model 1, with areas under the curve (AUC) of 80.2 %, and 78.1 %, respectively. Using  precision  forestry  by  making  decisions  based  on  the  area’s  landslide  susceptibility  in  the  management and planning stage (e.g., construction of forest infrastructure facilities, afforestation, and forest harvesting and rehabilitation), will increase the success of forestry activities.
    Conclusion: It  is  very  important  to  determine  the  landslide  areas  in  advance  and  reliably  for  effective  execution  of  forestry  practices  in  landslide  sensitive  forestlands,  in  order  to  increase  the  success of forestry activities in accordance with the sustainable forest management approach.

Experimentos de elección para el manejo del Parque Nacional Los Mármoles, México
Experimentos de elección para el manejo del Parque Nacional Los Mármoles, México
Enrique Melo-Guerrero; Juan Hernández-Ortíz; Antonio Aguilar-López; Rodrigo Rodríguez-Laguna; Miguel Ángel Martínez-Damián; Ramón Valdivia-Alcalá; Ramón Razo-Zárate
http://dx.doi.org/10.5154/r.rchscfa.2019.06.043
Received: 2019-06-03
Accepted: 2020-02-19
Available online: 2020-02-26 / pages -

Cambios en la temperatura y precipitación causados por tres cultivos en el estado de Veracruz, México
Cambios en la temperatura y precipitación causados por tres cultivos en el estado de Veracruz, México
Fernando Salas-Martínez; Ofelia Andrea Valdés-Rodríguez; Matías Méndez-Pérez
http://dx.doi.org/10.5154/r.rchscfa.2019.04.028
Received: 2019-04-19
Accepted: 2020-03-04
Available online: 2020-03-06 / pages -

Técnicas de estimación del volumen forestal con especial énfasis en los trópicos
Técnicas de estimación del volumen forestal con especial énfasis en los trópicos

http://dx.doi.org/10.5154/r.rchscfa.2019.07.061
Received: 2019-07-31
Accepted: 2020-03-11
Available online: 2020-03-13 / pages -

Crecimiento en campo de Pinus patula Schltdl. & Cham. como efecto de la poda radicular y los contenedores utilizados en vivero
Crecimiento en campo de Pinus patula Schltdl. & Cham. como efecto de la poda radicular y los contenedores utilizados en vivero
Manuel Aguilera-Rodríguez; Arnulfo Aldrete; J. Jesús Vargas-Hernández; Javier López-Upton; Miguel A. López-López; Víctor Manuel Ordaz-Chaparro
http://dx.doi.org/10.5154/r.rchscfa.2019.07.055
Received: 2019-07-01
Accepted: 2020-03-24
Available online: 2020-03-24 / pages -