نتایج جستجو برای: diversity of vegetation density
تعداد نتایج: 21214870 فیلتر نتایج به سال:
The conservation of tropical forest carbon stocks offers the opportunity to curb climate change by reducing greenhouse gas emissions from deforestation and simultaneously conserve biodiversity. However, there has been considerable debate about the extent to which carbon stock conservation will provide benefits to biodiversity in part because whether forests that contain high carbon density in t...
Since the mid-1990’s, several studies have been undertaken to evaluate thinning treatments designed to promote development of complex forest structure in order to enhance ecological functioning and biological diversity. Most of these studies have focused on forest responses to one or possibly two thinning entries. In contrast, this study, the Unevenaged Management Project (UAMP), is evaluating ...
Illegal small-scale gold mining brings several benefits to developing countries like Ghana, manifested mainly as employment and revenue but simultaneously impacts negatively on the immediate environment. The study tested the hypothesis that density and diversity of key native tree and shrub species differ in the mined and unmined areas of Nangodi in the Talensi-Nabdam District of the Upper East...
The assessment of relationships between satellite-derived vegetation indices and meteorological drought improves our understanding of how these indices respond to climatic changes. The combination of climate data and the Normalized Difference Vegetation Index (NDVI) product of Moderate Resolution Imaging Spectroradiometer (MODIS) imagery provided an opportunity to evaluate the impact of d...
Long-term effects of Lupinus lepidus on vegetation dynamics at Mount St. Helens by Roger del Moral & Lara Rozzell Abstract: The nitrogen-fixing legume Lupinus lepidus is the most abundant herb on recently formed volcanic surfaces at Mount St. Helen. We compared vegetation structure in 30 Lupinus colonies in three age classes (old, mature, or young based on known years of their establishment) to...
We critically reassess a conceptual model here, dealing with the potential effect of plant diversity on climate– vegetation feedback, and we provide an improved version adjusted to plant types that prevailed during the African Humid Period (AHP). Our work contributes to the understanding of the timing and abruptness of vegetation decline at the end of the AHP, investigated by various working gr...
Insects are key components of urban ecological networks and are greatly impacted by anthropogenic activities. Yet, few studies have examined how insect functional groups respond to changes to urban vegetation associated with different management actions. We investigated the response of herbivorous and predatory heteropteran bugs to differences in vegetation structure and diversity in golf cours...
the purpose of this research was to investigate the relationship between vegetation cover and soil characteristics in order to determine the most important soil factors which affect on quantitative variations and types of vegetation cover in the study area. the study area is located in west of tehran province and southeast of hashtgerd, next to najm-abad village. after field studies, the index ...
the relationship between topography, soil factors, and distribution of ecological vegetation groups in the nodoushan arid rangelands of yazd province (iran) was investigated. the present species were recorded in each vegetation group using a randomized-systematic sampling method. plant cover and density were estimated quantitatively using the transect and quadrate methods, and the two-way indic...
In mountainous areas such as the southern Appalachians USA, riparian zones are difficult to define. Vegetation is a commonly used riparian indicator and plays a key role in protecting water resources, but adequate knowledge of floristic responses to riparian disturbances is lacking. Our objective was to quantify changes in stand-level floristic diversity of riparian plant communities before (20...
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