The comparison of the estimation of the biomass of tropical forest vegetation with the different forest stand age by using multi-variant linear regression

2003 ◽  
Author(s):  
Cunjian Yang ◽  
Jiyuan Liu ◽  
He Huang ◽  
Sibo Fang ◽  
Siyuan Wang
Keyword(s):  
Linear Regression ◽  
Tropical Forest ◽  
Forest Stand ◽  
Forest Vegetation ◽  
Stand Age

scholarly journals Soil Organic Carbon Stocks in Afforested Agricultural Land in Lithuanian Hemiboreal Forest Zone

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1562
Author(s):  
Iveta Varnagirytė-Kabašinskienė ◽  
Povilas Žemaitis ◽  
Kęstutis Armolaitis ◽  
Vidas Stakėnas ◽  
Gintautas Urbaitis
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Forest Floor ◽  
Agricultural Land ◽  
Forest Stand ◽  
Stand Age ◽  
Soc Stock ◽  
The Mean ◽  
Soc Stocks ◽  
Topsoil Layer

In the context of the specificity of soil organic carbon (SOC) storage in afforested land, nutrient-poor Arenosols and nutrient-rich Luvisols after afforestation with coniferous and deciduous tree species were studied in comparison to the same soils of croplands and grasslands. This study analysed the changes in SOC stock up to 30 years after afforestation of agricultural land in Lithuania, representing the cool temperate moist climate region of Europe. The SOC stocks were evaluated by applying the paired-site design. The mean mass and SOC stocks of the forest floor in afforested Arenosols increased more than in Luvisols. Almost twice as much forest floor mass was observed in coniferous than in deciduous stands 2–3 decades after afforestation. The mean bulk density of fine (<2 mm) soil in the 0–30 cm mineral topsoil layer of croplands was higher than in afforested sites and grasslands. The clear decreasing trend in mean bulk density due to forest stand age with the lowest values in the 21–30-year-old stands was found in afforested Luvisols. In contrast, the SOC concentrations in the 0–30 cm mineral topsoil layer, especially in Luvisols afforested with coniferous species, showed an increasing trend due to the influence of stand age. The mean SOC values in the 0–30 cm mineral topsoil layer of Arenosols and Luvisols during the 30 years after afforestation did not significantly differ from the adjacent croplands or grasslands. The mean SOC stock slightly increased with the forest stand age in Luvisols; however, the highest mean SOC stock was detected in the grasslands. In the Arenosols, there was higher SOC accumulation in the forest floor with increasing stand age than in the Luvisols, while the proportion of SOC stocks in mineral topsoil layers was similar and more comparable to grasslands. These findings suggest encouragement of afforestation of former agricultural land under the current climate and soil characteristics in the region, but the conversion of perennial grasslands to forest land should be done with caution.

Small-Scale Altitudinal Variation in Lowland Wet Tropical Forest Vegetation

1985 ◽  
Vol 73 (2) ◽  
pp. 505 ◽  
Author(s):  
Milton Lieberman ◽  
Diana Lieberman ◽  
G. S. Hartshorn ◽  
Rodolfo Peralta
Keyword(s):  
Tropical Forest ◽  
Forest Vegetation ◽  
Small Scale ◽  
Altitudinal Variation

Influence of forest stand age on soil water repellency and hydraulic conductivity in the Mediterranean environment

2021 ◽  
Vol 753 ◽  
pp. 142006 ◽  
Author(s):  
Demetrio Antonio Zema ◽  
Pedro Antonio Plaza-Alvarez ◽  
Xiangzhou Xu ◽  
Bruno Gianmarco Carra ◽  
Manuel Esteban Lucas-Borja
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Water ◽  
Water Repellency ◽  
Forest Stand ◽  
Stand Age ◽  
Mediterranean Environment ◽  
Soil Water Repellency ◽  
The Mediterranean

scholarly journals Using lichen communities as indicators of forest stand age and conservation value

2020 ◽  
Vol 475 ◽  
pp. 118436
Author(s):  
Jesse E.D. Miller ◽  
John Villella ◽  
Daphne Stone ◽  
Amanda Hardman
Keyword(s):  
Forest Stand ◽  
Stand Age ◽  
Conservation Value

scholarly journals Influences of Forest Type, Stand Age, and Weather on Deer Weights and Antler Size in the Southern Appalachians

1997 ◽  
Vol 21 (1) ◽  
pp. 11-18 ◽  
Author(s):  
William M. Ford ◽  
A. Sydney Johnson ◽  
Philip E. Hale ◽  
James M. Wentworth
Keyword(s):  
Age Structure ◽  
Forest Type ◽  
Site Index ◽  
Forest Stand ◽  
Site Quality ◽  
Stand Age ◽  
Southern Appalachians ◽  
Study Region ◽  
Pinus Spp ◽  
Percent Area

Abstract We analyzed correlations of forest type, age structure, and site index data with weights and antler characteristics of yearling white-tailed deer (Odocoileus virginianus) bucks from specific localities in the Chattahoochee, Cherokee, Nantahala, and Pisgah national forests in Georgia, Tennessee, and North Carolina. Areas in the northern part of the study region produced larger deer with larger antlers than those in the southern portion of the region. These northern areas differed from those to the south in having more diverse ownership and land use and in origins of deer stock. Weights and antler characteristics were significantly correlated (P < 0.05) with percent area in the cove hardwood type, but otherwise were poorly correlated with forest stand type and site index. Percent area in young (0-8 yr old) cove hardwood and in mid-successional (9-20 and 21-40) cove hardwood, pine (Pinus spp.), and upland oak (Quercus spp.) were significantly correlated (P < 0.05) with deer variables, particularly in years following a poor mast crop. Much of the quantifiable habitat influences on deer in the Southern Appalachians probably is masked by low deer densities and the small site quality differences among areas examined. Because much of the forest consists of mature mast-producing oaks and abundant forage is produced in both mature and younger aged stands, deer numbers seem to be below any threshold of quantifiable effects due to forest stand age structure. South. J. Appl. For. 21(1):11-18.

scholarly journals Features of structure of radical darkconiferous forest stands of Vishera Nature Reserve

2019 ◽  
Author(s):  
Ю.М. Алесенков ◽  
М.В. Ермакова
Keyword(s):  
Nature Reserve ◽  
Forest Stand ◽  
Forest Vegetation ◽  
Forest Stands ◽  
Pedigree Structure ◽  
National Nature Reserve ◽  
Northern Urals ◽  
Natural Factors ◽  
Standard Techniques ◽  
Diameter Classes

On the basis of the standard techniques the pedigree structure of forest stands and distribution of trees on diameter of climax darkconiferous stands of the Vishera national Nature Reserve located in the northeast of Perm District (Northern Urals) is studied and analysed. It is established that the wood layer of the explored climax darkconiferous forests of Northern Urals has multispecies structure. At domination of a spruce fir and the fir (up to 5 units) and, substantially a birch and, also participates, the cedar. In type of the wood Firspruce fernytallgrass as the as a part of a forest stand there is a rowan. Both lowproductive, and highly productive forest stands are formed. In a structure of forest stands of the darkconiferos woods of Vishera Nature Reserve the considerable variation of trees on diameter caused both by forest vegetation conditions of plantings, and influence of negative natural factors the periodic local fires and a windfall is revealed. Distribution of trees on diameter in forest stands, except for postwindfall, is well approximated by the equations of the 2nd order. Distribution of trees on diameter in postwindfall darkconiferous community is best of all described by the equation of the 4th order. The considerable righthand asymmetry of distribution of trees on diameter for all studied forest stands, and, in particular, the affected local fires or a windfall is noted. Such distribution of trees on diameter classes of a trunk reflects processes of natural renewal and development of forest stands, long on time. The revealed features of distribution of trees on pedigree structure and of diameter classes in the studied radical forest stands demonstrate that even in the conditions of influence of negative natural factors processes of natural renewal in general, provide maintenance of multispecies structure of radical plantings. However, impact of the periodic local fires negatively affects renewal of a cedar.

Forest stand age map of Canada (2004) and the United States (2006)

2014 ◽  
Author(s):  
Yude Pan ◽  
Jing Chen ◽  
Richard Birdsey ◽  
Kevin McCullough ◽  
Liming He ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Forest Stand ◽  
Stand Age
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