نتایج جستجو برای: relative factor to plant cover and soil contains canopy cover

تعداد نتایج: 18483857  

Water harvesting is the collection of runoff for productivity purposes, instead of runoff being left to cause erosion. In arid and semi-arid drought-prone areas, micro-catchments are widely used as a water harvesting method to improve rangeland condition. The aim of present study was to investigate the effects of micro-catchment on ecological indices of rangeland health in Ghick-Sheikhha, Jirof...

Forest fragmentation results in a loss of forest interior and an increase in edge habitat. We studied how understorey bird community composition and habitat variables changed along an edge-to-interior gradient in a 1248-ha lowland rainforest patch in peninsular Malaysia. Birds and environmental variables such as vegetation structure and litter depth were detected within a 25-m radius of each of...

Journal: :اکو هیدرولوژی 0
سعید یوسفی کارشناس ارشد بیابان زدایی، دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان سید حمید متین خواه استادیار، دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان فرزاد روحانی مربی، دانشکدة منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان محسن نائل استادیار، دانشکدة کشاورزی، دانشگاه همدان

stemflow is a part of precipitation which enters in to the soil through stem and branches. in this paper, we studied the stem flow features of anabasis aphylla as a bush and pteropyrum aucheri as a shrub in northwest of isfahan. stemflow production mechanism as well as the effects of canopy cover on this system was investigated during precipitation seasons in 2013 and 2014. a rain simulator was...

2008
J. M. Sánchez W. P. Kustas V. Caselles M. C. Anderson

Models estimating surface energy fluxes over partial canopy cover with thermal remote sensing must account for significant differences between the radiometric temperatures and turbulent exchange rates associated with the soil and canopy components of the thermal pixel scene. Recent progress in separating soil and canopy temperatures from dual angle composite radiometric temperature measurements...

Journal: :international journal of advanced biological and biomedical research 2015
marjan diyanat

objective: citrus (citrus reticulata) is one of the most important horticultural plant in iran and weed management throuth ecological methods such as cover crop is a proper option in orchard management practices. methods: the experiment was designed as a split plot on the base of complete randomized block design with four replications in mazandaran province, sari, voushka county from 2010 to 20...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده کشاورزی 1394

with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...

The study of  vegetation dynamics under grazed and non-grazed rangelands is one of the most important prerequisites for range improvement. In this research, vegetation composition and the vegetation functional groups were compared in an exclosure site (livestock excluded for six years) and grazed area in semi-steppe rangelands in Tehran province. Systematic random sampling technique through the...

2013
Lackson Chama Dana G. Berens Colleen T. Downs Nina Farwig

Plant-frugivore networks play a key role in the regeneration of sub-tropical forest ecosystems. However, information about the impact of habitat characteristics on plant-frugivore networks in fragmented forests is scarce. We investigated the importance of fruit abundance, fruiting plant species richness and canopy cover within habitat fragments for the structure and robustness of plant-frugivor...

Journal: :journal of rangeland science 0
mohsen sharafatmandrad natural resources department, rangeland and watershed management section, university of jiroft, jiroft, iran hossein naderi faculty of rangeland and watershed management, gorgan university of agricultural sciences and natural resources

biodiversity plays a crucial role in stability and productivity of natural ecosystem. the main goal of this research was to classify ecological groups in steppe rangeland and investigate their relationships with plant diversity indices. therefore, fifty different land unit tracts (lut) were identified in khod-neuk basin, yazd province, iran, in 2010. vegetation and soil samples were taken in th...

Journal: :محیط زیست طبیعی 0
رضا تمرتاش دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران مائده یوسفیان دانشگاه آزاد اسلامی واحد نور، ایران سیده خدیجه مهدوی دانشگاه آزاد اسلامی واحد نور، ایران محمد مهدوی دانشگاه آزاد اسلامی واحد نور، ایران

nowadays green house gases such as carbon have the most effect on global climate changes that can be decreased by plant and soil carbon sequestration of rangelands. livestock grazing has high potential to decrease or increase carbon storage. so this research investigated the effects of enclosure on plant carbon storage in rangeland of enclosure (shah tappeh-chah mahmood) and no enclosure (chiro...

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