نتایج جستجو برای: stand structure
تعداد نتایج: 1598992 فیلتر نتایج به سال:
We synthesize insights from current understanding of drought impacts at stand-to-biogeographic scales, including management options, and we identify challenges to be addressed with new research. Large stand-level shifts underway in western forests already are showing the importance of interactions involving drought, insects, and fire. Diebacks, changes in composition and structure, and shifting...
Article history: Received 15 May 2016 Received in revised form 18 November 2016 Accepted 27 December 2016 Available online xxxx The goal of this study was to explore the relationships between stand-level photochemical reflectance index (PRI) and canopy structure/pigment pools, as well as light use efficiency (LUE) of photosynthetically active vegetation focusing on seasonal or ontogenetic time ...
in this research with using of obtained information from a natural fraxinus the variation of quantities and qualitative measures of current stand in an 8 year period was conducted in chelir part of kheyroud forest. data collection was conducted by full callipering method in two periods of 1384 and 1392. during the period of study the parameters of dominant mean height and relative crown height ...
Canopy gaps induced by tree falls have an important ecological role in forest communities since they act on forest sylvigenesis, dynamics and specific composition, mainly through modifications of the light context they involve. Some factors responsible for tree fall occurrences become more influent on sloping areas, particularly crown asymmetry. We have already shown in previous work (Robert, 2...
We investigate the nature of charge transport in deoxyribonucleic acid (DNA) using self-assembled layers of DNA in large-area molecular junctions. A protocol was developed that yields dense monolayers where the DNA molecules are not standing upright, but are lying flat on the substrate. As a result the charge transport is measured not along the DNA molecules but in the transverse direction, acr...
The management of stand structure and the protection species diversity are crucial to forest ecosystem service functions. Changbai Mountain is one three major regions in Northeast China, understanding characteristics allometric relationship between variables correlation factors basis for achieving effective ecological function improvement. In this study, typical deciduous broad-leaved mixed con...
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This study describes the composition and structure of a mature, secondgrowth Pinus taeda (Loblolly Pine) and Pinus echinata (Shortleaf Pine)-dominated old-fi eld stand. Now owned by the University of Arkansas, this 22.5-ha parcel just outside of the city of Monticello, AR, has been protected as a de facto natural area since the 1950s. Many of the overstory pines exceeded 75 cm in diameter at br...
Increased forest density resulting from decades of fire exclusion is often perceived as the leading cause of historically aberrant, severe, contemporary wildfires and insect outbreaks documented in some fire-prone forests of the western United States. Based on this notion, current U.S. forest policy directs managers to reduce stand density and restore historical conditions in fire-excluded fore...
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