نتایج جستجو برای: vegetation types

تعداد نتایج: 531142  

2005
SUSAN M. TIMMINS

Vegetation succession on Mt Tarawera, Rotorua, New Zealand, a recently erupted volcano, was studied. Field data from 70 plots were collected and analysed by a clustering algorithm. The plots formed an altitudinal and successional series which included bare scoria, herbfield, mixed hardwood, scrub, kamahi forest and tawa forest. Because of the differential effects of the 1886 eruption, different...

2014
ERIKA M. DITTMAR

If differences in ecological requirements result in juvenile birds using different habitats from breeding birds, then habitat management to protect those birds must protect both breeding and postbreeding habitats. We examined habitat selection by juvenile black-capped vireos (Vireo atricapilla) following their independence from parental care, in 2010–2013 on Fort Hood Military Reservation in ce...

2006
T. Wagner

Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract A new method for the satellite remote sensing of different types of vegetation and ocean colour is presented. In contrast to existing algorithms, our method analyses weak narrow-band reflectance structures (i.e. " fingerprint " structures) of vegetation in...

2008
Yichun Xie Zongyao Sha Mei Yu

Aims Mapping vegetation through remotely sensed images involves various considerations, processes and techniques. Increasing availability of remotely sensed images due to the rapid advancement of remote sensing technology expands the horizon of our choices of imagery sources. Various sources of imagery are known for their differences in spectral, spatial, radioactive and temporal characteristic...

2015
V. P. Groner M. Claussen C. Reick

We critically reassess a conceptual model here, dealing with the potential effect of plant diversity on climate– vegetation feedback, and we provide an improved version adjusted to plant types that prevailed during the African Humid Period (AHP). Our work contributes to the understanding of the timing and abruptness of vegetation decline at the end of the AHP, investigated by various working gr...

2009
Johan Bergstedt Lars Westerberg Per Milberg

Cover estimates by eye is a prevailing method to assess abundance. We examined cover estimates with regard to bias and random variation. Ten observers working with a national forest vegetation survey estimated sixteen 100 m 2 -plots, placed in two different vegetation types. These had similar species composition but were clearly distinguishable in the field. In specieswise analyses, observer bi...

Journal: :مرتع و آبخیزداری 0
سید مرتضی ابطحی استادیار، پژوهش بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان اصفهان، سازمان تحقیقات، آموزش و ترویج کشاورزی

the purpose of this study was to investigate vegetation dynamics and range conditions considering the climatic conditions and soil properties in doolat gharin in the south of isfahan province of an area equal to 25 square kilometer. for this purpose, after determining vegetation types and associated species, the type of rangeland utilization, grazing season, the type of livestock and other rele...

ژورنال: علوم آب و خاک 2008
باغستانی , ناصر , ثواقبی, محمد حسین , رحیمیان , محمد حسن , عبداللهی, جلال ,

The present study discusses a method used to produce updated information about vegetation cover in arid and semi-arid zones, using RS data and GIS technique. In this method, Landsat ETM+ data in 2002 was collected in an area of about 60000 ha in Nodoushan basin, Yazd, Iran. To collect the necessary ground data, 50 sites of different vegetation types were selected and the percentage of vegetatio...

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