Relationship of litterfall to basal area and climatic variables in cool temperate forests of southern Tasmania

1983 ◽  
Vol 8 (4) ◽  
pp. 425-431 ◽  
Author(s):  
C. R. A. TURNBULL ◽  
J. L. MADDEN
Keyword(s):  
Temperate Forests ◽  
Basal Area ◽  
Climatic Variables ◽  
Cool Temperate ◽  
Relationship Of

Identifikasi Kearifan Lokal dalam Pemanfaatan Jenis-Jenis Tumbuhan Untuk Ketahanan Pangan Dan Obat-Obatan

MAKILA ◽  
2020 ◽  
Vol 14 (2) ◽  
pp. 73-86
Author(s):  
Yustina Anggraini ◽  
Paulus Matius ◽  
Hastaniah Hastaniah ◽  
Rita Diana
Keyword(s):  
Plant Species ◽  
Building Materials ◽  
Sampling Method ◽  
Local Community ◽  
Basal Area ◽  
Local Communities ◽  
Symbiotic Relationship ◽  
Traditional Medicines ◽  
Relationship Of ◽  
Analyze Data

This research aims to inventory local wisdom in the management and utilization of plants as food and medicine by local communities. The method conducted in this study is the purposive sampling method that aims to inventory plant species, direct observation, and analyze data by calculating density and basal area. The results showed 243 individual plants, consisting of 53 types of trees from 17 families, and found 29 types of plants were used as food and medicine. The utilization of plants by local communities varies. People use plant species for various benefits, namely foodstuffs, building materials, handicrafts, and traditional medicines. Local wisdom in the local community is the knowledge that lasts for generations and has a symbiotic relationship of mutualism with the forest ecosystem at the research site.

scholarly journals The Influence of Tree Structural and Species Diversity on Temperate Forest Productivity and Stability in Korea

Forests ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 1113 ◽  
Author(s):  
Juhan Park ◽  
Hyun Seok Kim ◽  
Hyun Kook Jo ◽  
II Bin Jung
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Temperate Forest ◽  
Temperate Forests ◽  
Basal Area ◽  
Stand Density ◽  
Structural Diversity ◽  
Forest Productivity ◽  
Tree Species Diversity ◽  
Positive Effect

Research Highlights: Using a long-term dataset on temperate forests in South Korea, we established the interrelationships between tree species and structural diversity and forest productivity and stability, and identified a strong, positive effect of structural diversity, rather than tree species diversity, on productivity and stability. Background and Objectives: Globally, species diversity is positively related with forest productivity. However, temperate forests often show a negative or neutral relationship. In those forests, structural diversity, instead of tree species diversity, could control the forest function. Materials and Methods: This study tested the effects of tree species and structural diversity on temperate forest productivity. The basal area increment and relative changes in stand density were used as proxies for forest productivity and stability, respectively. Results: Here we show that structural diversity, but not species diversity, had a significant, positive effect on productivity, whereas species diversity had a negative effect, despite a positive effect on diversity. Structural diversity also promoted fewer changes in stand density between two periods, whereas species diversity showed no such relation. Structurally diverse forests might use resources efficiently through increased canopy complexity due to canopy plasticity. Conclusions: These results indicate reported species diversity effects could be related to structural diversity. They also highlight the importance of managing structurally diverse forests to improve productivity and stability in stand density, which may promote sustainability of forests.

The Relationship of Environmental Temperature to the Incidence and Outcome of Schizophrenia

1992 ◽  
Vol 160 (6) ◽  
pp. 788-792 ◽  
Author(s):  
Sunjai Gupta ◽  
Robin M. Murray
Keyword(s):  
Pilot Study ◽  
Environmental Temperature ◽  
Climatic Variables ◽  
Sociocultural Factors ◽  
Outcome Study ◽  
Daily Range ◽  
The Mean ◽  
Relationship Of ◽  
The Relationship

This paper presents new analyses of data from two multicentre studies carried out by the WHO. The morbid risk of developing schizophrenia, as broadly defined by the Determinants of Outcome Study, was positively related to the mean daily range of temperature. The outcome of schizophrenia, as determined by the International Pilot Study of Schizophrenia, was found to be positively related to mean environmental temperature. Further studies are needed to examine the relationship of geographical and climatic variables to schizophrenia in order to complement what is already known about the role of sociocultural factors.

Fruit fall in five warm- and cool-temperate forests in Yakushima, Japan

2010 ◽  
Vol 12 (4) ◽  
pp. 184-192 ◽  
Author(s):  
Goro Hanya ◽  
Shin-ichiro Aiba
Keyword(s):  
Temperate Forests ◽  
Cool Temperate

The relationship of stand structure with canopy transmittance: Simple models and practical methods for managing understory light conditions in eastern white pine (Pinus strobus L.)-dominated forests

2014 ◽  
Vol 90 (04) ◽  
pp. 489-497 ◽  
Author(s):  
William C. Parker
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Pinus Strobus ◽  
Red Pine ◽  
Canopy Closure ◽  
White Pine ◽  
Light Levels ◽  
Pine Regeneration ◽  
Relationship Of ◽  
The Relationship

The relationship of stand structural features with understory light levels, estimated by gap light index (GLI), was investigated in 22 second-growth eastern white (Pinus strobus L.) and red pine (Pinus resinosa Ait.)-dominated stands in central Ontario that encompassed a broad range in density and basal area. Simple, empirical light models were developed to quantify the influence of several stand structural variables on canopy transmittance as estimated by GLI. Models were also derived to facilitate the operational identification of residual basal area, density, and percent canopy closure associated with target understory light levels that optimize the growth of white pine regeneration and its protection from weevil and blister rust when using the uniform shelterwood silvicultural system. Regression models indicated significant negative, nonlinear relationships of GLI with density, basal area, a stand density index, total crown area, and foliar biomass, while GLI was linearly related to percent canopy closure. Application of these models to identify density, basal area, and canopy closure values associated with target light levels for the regeneration and removal cuts of uniform shelterwoods demonstrates the use of this information to help guide management of white pine–red pine forests.

The aftermath of tree death: coarse woody debris and the topography in four tropical rain forests

2000 ◽  
Vol 30 (9) ◽  
pp. 1489-1493 ◽  
Author(s):  
Neil Gale
Keyword(s):  
Coarse Woody Debris ◽  
Woody Debris ◽  
Basal Area ◽  
Slope Position ◽  
Tropical Rain Forests ◽  
Rain Forests ◽  
Dead Tree ◽  
Dead Trees ◽  
Relationship Of ◽  
The Relationship

The relationship of coarse woody debris (CWD) was examined with respect to topography and site in four lowland tropical rain forests in northern Borneo and western Ecuador. In total, 1914 dead trees [Formula: see text]20 cm diameter at breast height were enumerated in 46 ha. The basal area per hectare of dead trees varied strongly with both site and slope position. Dead basal area and its correlate dead tree density increased moving up the topographic gradient from the valleys to the ridges. Site estimates for CWD volume ranged from 96 to 154 m3·ha-1. Mean standing CWD volume was four times higher on the ridge tops (54 m3·ha-1) compared with the valley and cross-terrain areas (both 13 m3·ha-1). In contrast, downed volume did not vary with slope position. The proportions of CWD present as standing wood were two to three times higher in the Bornean sites compared with Hoja Blanca. These topographical and site differences in CWD were linked to differences in mode of tree death as well as the distribution of live trees per hectare.

scholarly journals Evaluating and modeling variation in site-level maximum carrying capacity of mixed-species forest stands in the Acadian Region of northeastern North America

2019 ◽  
Vol 95 (03) ◽  
pp. 171-182 ◽  
Author(s):  
Aaron R. Weiskittel ◽  
Christian Kuehne
Keyword(s):  
North America ◽  
Prediction Model ◽  
Carrying Capacity ◽  
Stand Structure ◽  
Regional Scale ◽  
Basal Area ◽  
Climatic Variables ◽  
Site Quality ◽  
Forest Stands ◽  
Mixed Species

Currently no universal approach exists to estimate regional site-level maximum carrying capacity in terms of stand densityindex (SDIMAX) of mixed species stands across contrasting forest ecosystems. Regional research efforts that account forinfluential stand-level variables and species traits are needed to reliably derive SDIMAX under varying environmental conditions and stand characteristics. This study used regionally comprehensive forest inventory data from various permanentsampling efforts to evaluate the effects of contrasting biotic and abiotic stand- and site-level factors on SDIMAX of multiple-species, structurally heterogeneous stands of the climatically diverse Acadian Forest Region of North America. Specifically,we aimed to i) quantify the stand-level maximum size-density line for an array of forest stands found across the study area,irrespective of stand structure; ii) evaluate the relationship between this stand-specific estimate of SDIMAX and various other stand-level attributes; and, iii) develop a generalized SDIMAX prediction model using SDIMAX estimates from objective i) aswell as potential regional drivers of SDIMAX from objective ii). The most influential stand-level factors on SDIMAX were proportion of total stand basal area in hardwood species, basal area weighted mean specific gravity, range in stem diameter, andspecies diversity. Direct climatic variables were not included in our SDIMAX prediction model due to the limited variationexplained, but relationships with elevation and a site quality index based on these climatic variables were. Overall, we con-clude that i) variation in SDIMAX appears to be mostly driven by the softwood to hardwood ratio of the mixed species,structurally complex stands evaluated in our study and ii) the general approach offers a viable framework for estimating sitemaximum carrying capacity at a regional-scale and effectively managing stand density accordingly.

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