Treefall gaps are the major source of disturbance in most tropical forests. The frequency and size of these gaps have important implications for forest ecosystem processes as they can influence the functional trait distribution of tree communities, stand-level aboveground biomass and productivity. However, we still know little about the relative importance of environmental drivers of gap distur...

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. ...

In this paper, we propose a new roundness parameter R, to denote circularity corrected by aspect ratio. The basic concept of this new roundness parameter is given by the following equation: R = Circularity + (Circularity perfect circle Circularity aspect ratio) where Circularityperfect circle is the maximum value of circularity and Circularityaspect ratio is the circularity when only the aspect...

The formation of many nebkha dunes relies on the layering of clonal plants. The microenvironmental conditions of such phytogenic nebkha are heterogeneous depending on the aspect and slope. Exploring the effects of aspect on clonal reproduction and biomass allocation can be useful in understanding the ecological adaptation of species. We hypothesized that on the windward side layering propagatio...

We study rectangles whose vertices lie in sequence on four lines the plane by parametrizing these two ways, one involving slope and other aspect ratio. This produces paths, that finds with specified describe geometry of paths its dependence choice lines. Our methods are algebraic work over an arbitrary field.

Taken 1:10000 Scale topographic map in the small watershed of Genxi River as an example, under the support of ARCVIEW and ARC/INFO software of GIS, through digitizing topographic map and other special maps to set up a spatial geodatabase. This paper forms a digital elevation model and has an analysis of slope and aspect, also discovered knowledge referenced for soil and water conservation. The ...

factors influencing the distribution of prairie species in complex terrain in central Canada (Lieffers and LarkinComplex topography and varied soil of hill-land pastures create Lieffers, 1987). Slope aspect also influenced diversity microsite conditions that support an array of floristic associations and herbage production patterns. This complicates management for forage of naturalized flora oc...