نتایج جستجو برای: physiographic conditions
تعداد نتایج: 848738 فیلتر نتایج به سال:
The streambed median grain size (D50) has been an integral part of many sediment transport and stream power equations seeking to characterize channel stability conditions. However, its previous usage is constrained by regional applicability, localization datasets, a limited number data points. This study uses large geographically diverse set (n > 2400), from five published sources, present q...
This study documents the global distribution and characteristics of diurnally varying low-level jets (LLJs), including their horizontal, vertical, and temporal structure, with a special emphasis on highlighting the underlying commonalities and unique qualities of the various nocturnal jets. Two tools are developed to accomplish this goal. The first is a 21-yr global reanalysis performed with th...
BACKGROUND Understanding the drivers of large-scale vegetation change is critical to managing landscapes and key to predicting how projected climate and land use changes will affect regional vegetation patterns. This study aimed to improve our understanding of the role, magnitude and spatial distribution of the key environmental factors driving vegetation change in southern African savanna, and...
We used dendrochronological methods and remnant fire-scarred red pines (Pinus resinosa Ait.) to reconstruct historical fire regime characteristics relate these findings past climate, human land use changes, vegetation for a landscape in northern Minnesota, USA. A total of 314 scars were dated, representing 56 unique events from 1565 1967. In the period prior exclusion (1535–1935), intervals ran...
Early age competition control has been reported to significantly improve the growth and yield of plantation grown loblolly pine. The objective of this paper is to understand the changes in wood properties: basal area weighted whole disk SG, earlywood SG (EWSG), latewood SG (LWSG) and latewood percent (LWP) of 14 year-old trees which received early age herbaceous and hardwood competition control...
Eighteen low flow indicators are considered in the research of sixteen hydrological stations Juzna Morava river basin. The estimated by statistical analysis and grouped as environmental indicators. A crosscorrelation between all is assessed. Environmental flows at hydrologic obtained GEP method. transferred to two small ungauged basins regression with physiographic characteristics. adjustment p...
Changing climate can strongly affect tree growth and forest productivity. The dendrochronological approach to assessing the impact of change on is possible through climate–growth correlation analysis. This study uses an individual tree-based model Pinus wallichiana (P. wallichiana) radial response across physiographic gradients in lower distributional range Nepal. sampled six sites Makwanpur di...
Ecological niche modeling of the main forest-forming species within same geographic range contributes significantly to understanding coexistence and regularities formation their current spatial distribution. The abiotic biotic environmental variables, as well dispersal capability, affecting distribution in Caucasus, have not been sufficiently studied. We conducted studies physiographic boundari...
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