نتایج جستجو برای: stem biomass
تعداد نتایج: 338601 فیلتر نتایج به سال:
Aboveground and coarse root allometric relationships were tested across three mountain big sagebrush (Artemisia tridentata var. vaseyana (Rydb.) chronosequences at three stages of recovery from fire (establishment, expansion, and mature) in Wyoming, USA. Big sagebrush shrubs dominate North American rangelands and are critical components of habitat for threatened species such as sage grouse. The...
The management of the moringa to produce biomass, as it is for other vegetal species, must consider some aspects that foster productivity. Among these aspects, cultivation density a crucial element. This research aimed assess effects spacing and cuts on growth moringa. treatments consisted four spacings: 0.5 x 1.0 m; 0.83 1.25 1.66 m. experimental design was randomized-block with five repetitio...
The combined effects of intensive management and planting of improved seedlings have led to large increases in productivity on intensively managed pine forests in the southeastern United States. To best match clones to particular site conditions, an understanding of how specific clones respond to changes in nutrition in terms of biomass partitioning, leaf physiology and biochemistry will be nec...
background and objectives: infunction of the photosynthetic apparatus of halophytes plays an important role in their salinity tolerance. kochia as a halophyte, is of high ability in biomass production in salinity stress conditions. thus study photosynthesis and the related factors salinity stress can provide appropriate physiological view for better understanding of the plant mechanisms of in s...
Remotely-sensed estimates of forest biomass are usually based on various measurements of canopy height, area, volume or texture, as derived from LiDAR, radar or fine spatial resolution imagery. These measurements are then calibrated to estimates of stand biomass that are primarily based on tree stem diameters. Although humid tropical forest seasonality can have low amplitudes compared with temp...
Cacao (Theobroma cacao L.) is of significant economic importance in several tropical countries but its yield potentials are low mainly because of poor soil fertility especially low levels of potassium (K). Cacao has a high demand for K to maintain healthy growth and production. Knowledge of K use in cacao will help the development of suitable crop management practices and will aid breeding vari...
Studies on the use of biomass from short rotation coppices for briquette production as a sustainable biofuel have been scarce in literature. This study investigated effects two process variables, hammer mill screen size at three levels (5.3, 10.3, and 25.4 mm) moisture content (13.6, 19, 25% (w.b.)), properties briquettes poplar Max-4 trees. The whole tree was divided into fractions, crown stem...
BACKGROUND AND AIMS To improve the management of grass communities, early plant development was compared in three species with contrasting growth forms, a caespitose (Lolium perenne), a rhizomatous (Poa pratensis) and a caespitose-stoloniferous species (Agrostis stolonifera). METHODS Isolated seedlings were grown in a glasshouse without trophic constraints for 37 d (761 degrees Cd). The appea...
Background The development of fast-growing hardwood trees as a source of lignocellulosic biomass for biofuel and biomaterial production requires a thorough understanding of the plant cell wall structure and function that underlie the inherent recalcitrance properties of woody biomass. Downregulation of GAUT12.1 in Populus deltoides was recently reported to result in improved biomass saccharific...
The question of retrieving forest biomass from SAR data has been subject of numerous research works since the early 1990s. The first results using AIRSAR data showed that it was possible to invert P band SAR data into biomass maps. Using the currently available spaceborne SAR data, namely ERS, JERS and RADARSAT, the biomass retrieval appears limited in terms of biomass range and, in certain cas...
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