نتایج جستجو برای: fixed sample plot

تعداد نتایج: 623598  

2017
Sean Harrison Hayley E Jones Richard M Martin Sarah J Lewis Julian P T Higgins

Meta-analyses combine the results of multiple studies of a common question. Approaches based on effect size estimates from each study are generally regarded as the most informative. However, these methods can only be used if comparable effect sizes can be computed from each study, and this may not be the case due to variation in how the studies were done or limitations in how their results were...

Journal: :Journal of Research of the National Bureau of Standards, Section B: Mathematical Sciences 1968

Journal: :Remote Sensing 2017
Sebastian Lamprecht Andreas Hill Johannes Stoffels Thomas Udelhoven

Determining the exact position of a forest inventory plot—and hence the position of the sampled trees—is often hampered by a poor Global Navigation Satellite System (GNSS) signal quality beneath the forest canopy. Inaccurate geo-references hamper the performance of models that aim to retrieve useful information from spatially high remote sensing data (e.g., species classification or timber volu...

Journal: :تحقیقات جنگل و صنوبر ایران 0
جواد اسحاقی راد استادیار دانشکده منابع طبیعی دانشگاه ارومیه قوام الدین زاهدی امیری دانشیار، دانشکده منابع طبیعی دانشگاه تهران محمدرضا مروی مهاجر استاد، دانشکده منابع طبیعی دانشگاه تهران اسداله متاجی استادیار، واحد علوم و تحقیقات دانشگاه آزاد اسلامی

راش، گونه­های علفی، حاصل خیزی خاک، آنالیزهای چندمتغیره. this study was carried out in carpino-fagetum orientalis, rusco-fagetum orientalis,fagetum oriental and alno-fagetum orientalisforest communities of namkhaneh, gorazbon and chelir districts of kheiroudkenar forest. the aim of the research was investigation on relationship between understory vegetation and soil condition and to determine th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده کشاورزی 1390

abstract this study is carried out to determine the chemical composition in the three vegetative stages of the haloxylon sp., degradation parameters, with adding naoh and ca(oh2 ). for this purpose, in may and october and january 2010 enough some haloxylon sp. of the ammary area was prepared. crude protein and ash percentage are decrease, neutral detergent fiber percentage with pragress stage ...

2013
Massimiliano Marvasi George J. Hochmuth Mihai C. Giurcanu Andrée S. George Jason T. Noel Jerry Bartz Max Teplitski

MAIN OBJECTIVES Fresh fruits and vegetables become increasingly recognized as vehicles of human salmonellosis. Physiological, ecological, and environmental factors are all thought to contribute to the ability of Salmonella to colonize fruits and vegetables pre- and post-harvest. The goal of this study was to test how irrigation levels, fruit water congestion, crop and pathogen genotypes affect ...

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