نتایج جستجو برای: diameter at breast height and crown diameter

تعداد نتایج: 17219040  

2011
Georg E. Kindermann

In most cases forest practice in Austria use yield tables to predict the growth of their forests. Common yield tables show the increment of pure even-aged stands which are treated in a way the table developer recommends. The usage of these tables in stands which are either unevenaged, mixed or treated in another way, may lead to inaccurate predictions. To avoid these problems, forest growth mod...

  Today, modeling and determination of allometric equations of forest trees, especially Junipers trees, are very important for determination of biological status and carbon storage capacity of forest species. The aim of this study was to determine the most suitable allometric equations for estimating the biomass of leaf, sub branch, main branch, trunk, and biomass of total Juniperus excelsa tr...

Journal: :Remote Sensing 2016
Niva Kiran Verma David W. Lamb Nick Reid Brian Wilson

Studies estimating canopy volume are mostly based on laborious and time-consuming field measurements; hence, there is a need for easier and convenient means of estimation. Accordingly, this study investigated the use of remotely sensed data (WorldView-2 and LiDAR) for estimating tree height, canopy height and crown diameter, which were then used to infer the canopy volume of remnant eucalypt tr...

2007
William W. Oliver William W

WILLIAM W. OLIVER is in charge of the Station's silviculmnl research on California conifer types, wilh hcadquwcrs at Kcdding, Calif. He earned a bachelor's degree (1956) in forestry froin the University of New Hampshire. and a master of foreslry degree (1960) fmln the University of Michigan. He joined the Station in 1962. Advance regeneration is co~nmon under decadent, old-growth stands of Cali...

Journal: :Ecological applications : a publication of the Ecological Society of America 2014
Rosa C Goodman Oliver L Phillips Timothy R Baker

Tropical forests play a vital role in the global carbon cycle, but the amount of carbon they contain and its spatial distribution remain uncertain. Recent studies suggest that once tree height is accounted for in biomass calculations, in addition to diameter and wood density, carbon stock estimates are reduced in many areas. However, it is possible that larger crown sizes might offset the reduc...

Journal: :Remote Sensing 2011
Christoph Straub Barbara Koch

So far, only a few studies have been carried out in central European forests to estimate individual tree stem volume of pine trees from high resolution remote sensing data. In this article information derived from airborne laser scanner and multispectral line scanner data were tested to predict the stem volume of 178 pines (Pinus sylvestris) in a study site in the south-west of Germany. First, ...

2016
Huaijiang He Chunyu Zhang Fengguo Du Xiuhai Zhao Song Yang Qiang Zuo

Understory plants are important components of forest ecosystem productivity and diversity. Compared to biomass models of overstory canopy trees, few are available for understory saplings and shrubs and therefore their roles in estimation of forest carbon pools are often ignored. In this study, we harvested 24 understory species including 4 saplings, 9 tree-like shrubs and 11 typical shrubs in c...

2014
José Návar

The aim of this research was to develop a stand-class growth and yield model based on the diameter growth dynamics of Pinus spp. and Quercus spp. of Mexico’s mixed temperate forests. Using a total of 2663 temporary, circular-sampling plots of 1000 m2 each, nine Weibull distribution techniques of parameter estimation were fitted to the diameter structures of pines and oaks. Statistical equations...

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