نتایج جستجو برای: vegetation

تعداد نتایج: 47633  

Journal: :Remote Sensing 2016
Olena Dubovyk Tobias Landmann Andreas J. Dietz Gunter Menz

Currently there is a lack of quantitative information regarding the driving factors of vegetation dynamics in post-Soviet Central Asia. Insufficient knowledge also exists concerning vegetation variability across sub-humid to arid climatic gradients as well as vegetation response to different land uses, from natural rangelands to intensively irrigated croplands. In this study, we analyzed the en...

2013
Guo Liu Yi Yin Hongyan Liu Qian Hao

Validating model simulations of vegetation-climate feedback needs information not only on changes in past vegetation types as reconstructed by palynologists, but also on other proxies such as vegetation cover. We present here a quantitative regional vegetation cover reconstruction for North China during the Holocene. The reconstruction was based on 15 high-quality lake sediment profiles selecte...

2011
Shajimon K John

Vegetation studies helps to develop a profile on extensive areas affected by vegetation changes. Image processing techniques does manipulation of digital images for various applications. The satellite image processing is increasingly used for vegetation mapping. Now a day‟s both multi spectral sensors and hyper spectral sensors are used for vegetation monitoring. General Terms Remote sensing, V...

Journal: :مرتع و آبخیزداری 0
فاطمه هادیان کارشناس ارشد مرتع داری، دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان رضا جعفری استادیار دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان حسین بشری استادیار دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان سعید سلطانی دانشیار دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان

because soil moisture condition affects vegetation changes hence, monitoring of drought and vegetation changes are among valuable management tools in these ecosystems. nowadays, satellite images are used as a low-cost and fast method for vegetation study in different scales. vegetation change is assessed using vegetation spectral characteristics. this study aimed to analyze and monitor the vege...

2015
Johanna Jalonen Juha Järvelä Matti Vaaja Matti Kurkela Hannu Hyyppä Yong Wang

Detailed modeling of floodplain flows and associated processes requires data on mixed, heterogeneous vegetation at river reach scale, though the collection of vegetation data is typically limited in resolution or lack spatial information. This study investigates physically-based characterization of mixed floodplain vegetation by means of terrestrial laser scanning (TLS). The work aimed at devel...

ژورنال: مرتع 2022

Railway construction is one of the important activities in the development of any country and in developing countries, the need for roads is one of the main axes of development. Railway construction operations can effect on desert rangelands around railway. This study investigates the effects of Yazd-Eghlid railway construction on vegetation diversity and richness in  the rangelands of Kalmand-...

2006
Tanja Falkowski Jörg Bartelheimer Myra Spiliopoulou

In this paper we propose a model to analyze community dynamics. Recently, several methods and tools have been proposed to extract communities from static graphs. However, since communities are not static, but change over time, it is necessary to provide methods to determine and observe the community transitions and to extract the factors that cause the development. We regard a community as an o...

2012

Figure 1: Rare Event Detection includes both Rare Mutation Detection (RMD) and Rare Species Detection (RSD). RMD and RSD can be classified according to their assay components. An RMD assay is comprised of a single primer set plus two competitive probes. RSD utilizes either a single assay to detect a rare species per unit volume (Case 1) or two independent, noncompetitive assays to detect a rare...

2009
Denis Geraads Stephanie Melillo Yohannes Haile-Selassie

Hominid-bearing sites of the north western part of the Woranso-Mille research area, dated to between 3.7 and 3.8 Ma., yield 10 species of Bovidae. The evolutionary stages of the most common species fit quite well this radiometric age. The most abundant bovid is a new species of Aepyceros, of large size, with upright, lyrated horn-cores; it is clearly distinct from the impalas of younger sites i...

2016
W. M. Haffkine

ation of spores the means by which the microbe of this disease, when outside the animal body, protected itself against the external world. Shortly after this it has been found that the spores not only preserve the life but also all specific properties of the microbe, and that it is owing to this circamstance that the bacillus of anthrax is one of the most constant species of schizomycetes known...

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