نتایج جستجو برای: residual trees

تعداد نتایج: 180450  

2009
Keith B. Aubry Charles B. Halpern Charles E. Peterson

In the Pacific Northwest (PNW) region of the contiguous United States, retention of live (green) trees in harvest units is an integral part of forest management practices on federal lands, yet the ecological benefits that result from various levels or patterns of retained trees remain speculative. The Demonstration of Ecosystem Management Options (DEMO) study was established to address these in...

Journal: :Discrete Mathematics 1990

Journal: :Agronomy 2021

This paper aims to determine farmers’ willingness pay for irrigation water, using the residual value method, most representative crops at six Irrigation Communities from Alentejo region, southern Portugal. The main objective of this assessment was that farmers would be able water irrigate different locations, and show approach can used provide information about farming economic sustainability s...

احمدی, اکرم, باده یان, ضیاءالدین, بارانی بیرانوند, زینب, مهدی کرمی, شهرام,

The formation of gall is one of the various types of vegetarianism, and gall producing insects cause stress in their hosts. The present study aimed to investigate the changes of some biochemical and photosynthetic indices due to the gall in Persian oak trees in Forests of Middle Zagros. Sampling was performed from trees infected by gall and healthy trees in Blouran forests. The results showed t...

Journal: :New Phytologist 2002

2017
D. M. POCHÉ R. M. POCHÉ S. MUKHERJEE G. A. FRANCKOWIAK L. N. BRILEY D. J. SOMERS R. B. GARLAPATI

Visceral leishmaniasis (VL) is a disease that results in approximately 50 000 human deaths annually. It is transmitted through the bites of phlebotomine sandflies and around two-thirds of cases occur on the Indian subcontinent. Indoor residual spraying (IRS), the efficacy of which depends upon sandfly adults resting indoors, is the only sandfly control method used in India. Recently, in Bihar, ...

اعظمی, ایاد, حسینی, احمد,

This study was conducted in oak forests of Ilam province in order to evaluate the morphological characteristics of old trees including diameter at breast height, trunk height, whole tree height, minimum and maximum crown diameter, crown health, crown vitality, crown symmetry, health and form of the trunk, Was investigated. Selection of old trees was performed based on the criteria of DBH and wi...

Journal: :جنگل و فرآورده های چوب 0
مرتضی مریدی دانشجوی کارشناسی ارشد جنگل‏ شناسی و اکولوژی جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران وحید اعتماد استادیار گروه جنگل داری و اقتصاد جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران کیومرث سفیدی استادیار دانشکدة فناوری کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی، اردبیل، ایران منوچهر نمیرانیان استاد گروه جنگل داری و اقتصاد جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران سید محمد معین صادقی دانشجوی کارشناسی ارشد جنگل‏ شناسی و اکولوژی جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

knowledge of the stand condition and the gradual replacement of tree species in different development stages and phases provide appropriate information related to the close to nature treatments. stem exclusion phase is one of the important development phases in the forest stands development. the aim of study was to analyze the characteristics of dead trees in the stem exclusion phase in the les...

2003
T. Snäll P. J. Ribeiro H. Rydin

We studied the relative importance of local variables and dispersal for the occurrence and colonisation of the epiphytic bryophytes Orthotricum speciosum (spore dispersed), and O. obtusifolium (spore and asexual gemmae) on aspen trees (‘patches’) in two forest landscapes (one old-growth and one fragmented) using multiple logistic regression. The relative importance of dispersal was quantified a...

2014
Dale G. Brockway Edward F. Loewenstein Kenneth W. Outcalt

Proportional basal area (Pro-B) was developed as an accurate, easy-to-use method for making uneven-aged silviculture a practical management option. Following less than 3 h of training, forest staff from a range of professional backgrounds used Pro-B in an operational-scale field study to apply single-tree selection and group selection systems in longleaf pine (Pinus palustris Mill.) stands. Fie...

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