scholarly journals Responses of spatial pattern of woody plants’ basal area to topographic factors in a tropical karst seasonal rainforest in Nonggang, Guangxi, southern China

2016 ◽  
Vol 24 (1) ◽  
pp. 30-39 ◽  
Author(s):  
Yili Guo ◽  
◽  
Bin Wang ◽  
Wusheng Xiang ◽  
Tao Ding ◽  
...  
Keyword(s):  
Spatial Pattern ◽  
Woody Plants ◽  
Southern China ◽  
Basal Area ◽  
Topographic Factors ◽  
Tropical Karst

scholarly journals Projecting Stand Survival and Basal Area Based on a Self-Thinning Model for Chinese Fir Plantations

2020 ◽  
Vol 66 (3) ◽  
pp. 361-370
Author(s):  
Xiongqing Zhang ◽  
Quang V Cao ◽  
Hanchen Wang ◽  
Aiguo Duan ◽  
Jianguo Zhang
Keyword(s):  
Tree Species ◽  
Southern China ◽  
Critical Role ◽  
Basal Area ◽  
Chinese Fir ◽  
The Self ◽  
Survival Models ◽  
Stand Development ◽  
Growth And Survival ◽  
Stand Growth

Abstract The self-thinning rule has played a critical role in controlling stand stocking and modeling stand development in forest stands. Chinese fir (Cunninghamia lanceolata) is a native and fast-growing tree species used for timber production and is widely grown in southern China. Effective management of this important tree species requires accurate and reasonable predictions of stand growth and survival. Remeasured data from 48 plots distributed in Fujian, Jiangxi, Guangxi, and Sichuan provinces were used to develop models to predict stand survival and basal area based on the self-thinning trajectories. These trajectories were constructed using a self-thinning slope of –1.605, as suggested by Reineke (1933) (Method 1), and the slopes estimated either from two groups of sites (Method 2) or from climate variables (Method 3). Results indicated that the stand growth and survival models using Method 3 performed best, followed by Method 2 and Method 1. In addition, stand growth and survival curves predicted from Method 3 were more similar in shape to those from the observed values, as compared with Method 1. Overall, the models based on the self-thinning lines using climate-sensitive slopes provided reasonable predictions of the stand development dynamics. Therefore, these results facilitate modeling of the relation between stand growth/survival and self-thinning under climate change.

Floral traits of woody plants and their habitat differentiations in a northern tropical karst forest

2016 ◽  
Vol 24 (2) ◽  
pp. 148-156
Author(s):  
Yuliang Jiang ◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Woody Plants ◽  
Floral Traits ◽  
Karst Forest ◽  
Tropical Karst

scholarly journals COMPOSICIÓN VEGETAL, PREFERENCIAS ALIMENTICIAS Y ABUNDANCIA DE BIBLIDINAE (LEPIDOPTERA: NYMPHALIDAE) EN UN FRAGMENTO DE BOSQUE SECO TROPICAL EN EL DEPARTAMENTO DEL ATLÁNTICO, COLOMBIA

2015 ◽  
Vol 20 (3) ◽  
pp. 79-92 ◽  
Author(s):  
María Angélica VARGAS- ZAPATA ◽  
Carlos José BOOM- URUETA ◽  
Leidys Isabel SEÑA-RAMOS ◽  
Alba Lucia ECHEVERRY-IGLESIAS ◽  
Neis José MARTÍNEZ HERNÁNDEZ
Keyword(s):  
Woody Plants ◽  
Tropical Dry Forest ◽  
Basal Area ◽  
Dry Forest ◽  
Forest Fragment ◽  
Plant Composition ◽  
Components Analysis ◽  
Spatio Temporal ◽  
Determining Factor

<p>Se analizó la variación espacio-temporal de la abundancia de las mariposas de la subfamilia Biblidinae (Lepidoptera: Nymphalidae) en un fragmento de Bs-T en la Reserva Campesina La Montaña (RCM), Atlántico, Colombia; desde enero hasta agosto de 2011. Se marcaron cuatro puntos dentro del área de estudio, donde se ubicaron trampas Van Someren–Rydon cebadas con calamar en descomposición, fruta fermentada y con una mezcla de los anteriores cebos. Adicionalmente, se realizó una caracterización de la vegetación por punto, para lo cual se tomaron datos de diámetro a la altura del pecho (DAP), altura y tamaño de la copa para todas aquellas plantas leñosas con DAP mayor o igual a 2,5 cm. Se capturaron 76 individuos agrupados en seis especies y cuatro géneros; destacándose <em>Hamadryas februa</em> (Hübner) como la más dominante con 32 individuos. El mes de marzo presentó la mayor riqueza y abundancia (6 especies y 25 individuos) durantes las primeras lluvias en la zona. El punto 3 presentó los valores más altos de diversidad y abundancia de Biblidinae (5 especies y 37 individuos) y la mayor densidad de árboles (D= 0,28 individuos/m<sup>2</sup>). Se demuestra que la estructura de este grupo de mariposas presenta un patrón temporal y espacial en esta reserva. El análisis de componentes principales demostró que el área basal total (ABT) y la Densidad (D) de plantas leñosas, pueden considerarse como un factor determinante en la distribución y abundancia de las especies de la subfamilia Biblidinae en la RCM.</p><p align="center"><strong>Plant Composition, Feeding Preferences and Abundance of Biblidinae (Lepidoptera: Nymphalidae) in a Tropical Dry Forest Fragment in the Department of Atlántico, Colombia</strong></p><p>The abundance and spatio-temporal variation of butterflies of the Biblidinae subfamily (Lepidoptera: Nymphalidae) in a fragment of Tropical dry forest at the Reserva Campesina La Montaña (RCM), Atlántico, Colombia; from January until August 2011, was analyzed. Within the study area four points were marked; Van Someren-Rydon traps were placed.in each point using rotten squid, fermented fruit and a mixture of both as bait. In addition, a characterization of the vegetation by point was performed, taking data of the diameter to the breast height (DBH), height and size of treetop of all woody plants with a DBH greater than or equal to 2.5 cm. In total 76 butterfly individuals grouped in six species and four genera were captured; being <em>Hamadryas februa</em> (Hübner) the most dominant with 32 individuals. The greatest richness and abundance was recorded in March (6 species and 25 individuals), during the first rains in the study area. The point 3 presented the highest values of diversity and abundance (five species and 37 individuals) of Biblidinae and the higher density of trees (D= 0,28 individuals/m2). The structure of this butterflies group presents a spatio-temporal pattern in this reserve. The principal components analysis showed that the total basal area (ABT) and the density (D) of woody plants, can be considered a determining factor in the distribution and abundance of species of the subfamily Biblidinae at the RCM.</p>

scholarly journals The Application of Bayesian Model Averaging in Compatibility of Stand Basal Area for Even-Aged Plantations in Southern China

2014 ◽  
Vol 60 (4) ◽  
pp. 645-651 ◽  
Author(s):  
Xiongqing Zhang ◽  
Aiguo Duan ◽  
Leihua Dong ◽  
Quang V. Cao ◽  
Jianguo Zhang
Keyword(s):  
Bayesian Model ◽  
Bayesian Model Averaging ◽  
Southern China ◽  
Model Averaging ◽  
Basal Area ◽  
Stand Basal Area

scholarly journals Physiognomy and structure of a seasonal deciduous forest on the Ibiapaba plateau, Ceará, Brazil

Rodriguésia ◽  
2011 ◽  
Vol 62 (2) ◽  
pp. 379-389 ◽  
Author(s):  
Jacira Rabelo Lima ◽  
Everardo Valadares de Sá Barretto Sampaio ◽  
Maria Jesus Nogueira Rodal ◽  
Francisca Soares Araújo
Keyword(s):  
Woody Plants ◽  
Deciduous Forest ◽  
Basal Area ◽  
Deciduous Forests ◽  
Semiarid Region ◽  
Average Height ◽  
Total Density ◽  
Brazilian Semiarid ◽  
Soil Level ◽  
Three Components

Abstract The Brazilian semiarid region is dominated by caatinga. However, other vegetation formations occur, including deciduous and semi-deciduous forests. This study describes physiognomy and structure of a forest on the sedimentary Ibiapaba plateau. All plants within one hectare were separated into three components: woody plants with perimeter at soil level (PSL) ≥ 9 cm (WCLP), woody plants with PSL ≥ 3 and ≤ 8.9 cm (WCSP), and herb/subwoody plants (HSwC). WCLP included 88 species (33 families), WCSP 50 species (23 families) and HSwC only 7 species (5 families). Total density, basal area, and maximum and average height of WCLP were 5683 plants/ha, 47 m2/ha, 18 and 5 m respectively. Total density and basal area of WCSP were 17500 plants/ha and 2.8 m2/ha, respectively. Density of HSwC was 9 plants/m2 and only 31% of the sampled area was occupied by this component.

scholarly journals Growth and survival dynamics of partially cut northern hardwood stands as affected by precut competition and spatial distribution of residual trees

2019 ◽  
Author(s):  
Guillaume Moreau ◽  
Alexis Achim ◽  
David Pothier
Keyword(s):  
Spatial Distribution ◽  
Spatial Pattern ◽  
Basal Area ◽  
Competitive Environment ◽  
Marginal Effect ◽  
Growth And Survival ◽  
Permanent Sample Plots ◽  
Northern Hardwood ◽  
Partial Harvesting ◽  
Individual Trees

Abstract Modelling growth and survival dynamics after partial harvesting must take account of the heterogeneous spatial pattern of residual trees that results from the presence of machinery trails. We used data from 23 permanent sample plots in northern hardwood stands to reconstruct the growing environment of individual trees before and after partial harvesting. We modelled harvest probability, growth response and survival probability using a complementary set of explanatory variables that was assembled to reflect the spatial distribution of trees and skid trails prior to and after harvest. Results showed that the distribution of harvested trees was concentrated in skid trails and in their close vicinity. However, this spatial pattern had no significant effect on either the post-cut basal area increment (BAI) or the survival of residual trees. BAI and survival of individual trees were both mostly related to the competitive environment prior to harvest, while post-cut changes in competitive environment had only a marginal effect on growth and survival dynamics. We conclude that selection cuts did not substantially increase the growth and survival of residual trees, likely because tree removal was mostly concentrated near skid trails, where the negative effects of machinery access were highest.

scholarly journals Resilience of a eucalypt forest woody understorey to long-term (34 - 55 years) repeated burning in subtropical Australia

2012 ◽  
Vol 21 (8) ◽  
pp. 980 ◽  
Author(s):  
Tom Lewis ◽  
Valerie J. Debuse
Keyword(s):  
Woody Plants ◽  
Basal Area ◽  
Fire Frequency ◽  
Understorey Vegetation ◽  
Growth State ◽  
Eucalypt Forest ◽  
Fire Exclusion ◽  
Explained Variance ◽  
Subtropical Australia

We investigated the effects of annual burning since 1952, triennial burning since 1973, fire exclusion since 1946 and infrequent wildfire (one fire in 61 years) on woody understorey vegetation in a dry sclerophyll eucalypt forest, south-eastern Queensland, Australia. We determined the influence of these treatments, and other site variables (rainfall, understorey density, topsoil C : N ratio, tree basal area, distance to watercourse and burn coverage) on plant taxa density, richness and composition. The richness of woody understorey taxa 0–1 m in height was not affected by burning treatments, but richness of woody plants 1–7.5 m in height was lower in the annually burnt treatment than in the triennially burnt treatment from 1989 to 2007. Fire frequency and other site variables explained 34% of the variation in taxa composition (three taxon groups and 10 species), of which 33% of the explained variance was explained by fire treatment and 46% was explained by other site variables. Annual burning between 1974 and 1993 was associated with lower understorey densities mainly due to reduced densities of eucalypts 1–7.5 m in height. Triennial burning during the same period was associated with higher densities of eucalypts 0–7.5 m in height relative to the annually burnt and unburnt treatments. Most woody taxa persisted in the frequently burnt treatments through resprouting mechanisms (e.g. lignotuberous regeneration), and fire patchiness associated with low-intensity burning was also found to be important. Persistence of plants <1 m tall demonstrates the resilience of woody taxa to repeated burning in this ecosystem, although they mainly exist in a suppressed growth state under annual burning.

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