crataegus as a woody multipurpose species based on fruit production is very important for local residents in the northern zagros forests located at the south of west azerbaijan province. this study aimed at determining the quantitative characteristics, soil and physiographic properties in the crataegus spp. stands. in current study, eight crataegus habitats were selected and 3-5 0.1 ha circular...

A field remediation treatment was carried out to examine the long-term effect of biochar on the immobilisation of metals and the revegetation of a contaminated site in Castleford, UK. The extracted concentrations of nickel (Ni) (II) and zinc (Zn) (II) in the carbonic acid leaching tests were reduced by 83-98% over three years. The extracted Ni (II) and Zn (II) concentrations three years after t...

As urbanization increases worldwide, investments in nature-based solutions that aim to mitigate urban stressors and counter the impacts of global climate change are also on rise. Tree planting degraded lands—or afforestation—is one form solution has been increasingly implemented cities around world. The benefits afforestation are, however, contingent capacity soils support growth planted trees,...

The purpose of this study is to determine the woody species diversity in Sweet chestnut tree, Hazel-tree and Italian cypress ecosystems in the Guilan forests. A lozeng 0.5 ha sample plot was selectively established on each site. In the Sweet chestnut ecosystems , 4 sites were classified, whereas 10 sites of Hazel tree and Italian cypress ecosystems were classified based on species composition. ...

The effect of soil warming on CO2 and CH4 flux from a spruce–fir forest soil was evaluated at the Howland Integrated Forest Study site in Maine, USA from 1993 to 1995. Elevated soil temperatures (~5 °C) were maintained during the snow-free season (May – November) in replicated 15 3 15-m plots using electric cables buried 1–2 cm below the soil surface; replicated unheated plots served as the con...

In 1999, the Fall River Long-Term Site Productivity study began in coastal Washington to investigate how intensive management practices affect soil processes and forest productivity. By comparing conventional harvests to more intensive wood removal treatments, researchers are answering long-standing questions about how residual organic matter influences future growth. Also, by using herbicides ...

Tropical timber plantations provide a variety of environmental services, including recovery of biodiversity on degraded lands. For example, plantations can speed forest successional processes by improving microsite conditions and attracting seed dispersers, thus promoting woody regeneration. Timber species have been hypothesized to differ in understory recruitment success. In the present resear...

GRBlog is an on-line database providing researchers with quick access to all information reported in the GCN Circulars. Users of the GRBlog web site (grad40.as.utexas.edu/grblog.php) can search the circulars and produce afterglow light curve plots, or compile data tables. The site also offers advanced search capabilities to aide in statistical studies or comparative research. Most of the GCNs h...

In field experiments (1993–1998) using an annual self-pollinated vetch species, Vicia angustifolia, the effects of pre-dispersal seed predators (pre-DSPs) on plant performance and demography were studied. Insect exclusion by insecticides, vegetation perturbation at the start of the experiment by removing the top soil layer, and sowing extra seeds were applied at one site (Site 1) on 32 plots, a...