نتایج جستجو برای: and plant cover

تعداد نتایج: 16893867  

Assessment and monitoring of rangeland in different grazing managements seems necessary to manage rangelands. The plant functional groups can be used as appropriate responders for rangelands condition and management. Therefore, this study was performed and aimed to determine the most important traits that are influenced by rangeland variation and management. In order to this, three areas along ...

ژورنال: آبخیزداری ایران 2020

Surface gravel cover is an important factor for contoroling of soil erosion in dry area specially in area that plant can not grow because of excessive dryness and salinity. The objective of this study was investigation effect of different surface gravel cover on runoff and sediment yeild. For this porpose, 36 field plots with 20 meter length and 0.5 meter width at 3 percent slope were construct...

Journal: :journal of agricultural science and technology 0
l. majchrzak department of agronomy, poznan university of life sciences dojazd 11, 60-632 poznan, poland z. sawinska department of agronomy, poznan university of life sciences dojazd 11, 60-632 poznan, poland m. natywa department of general and environmental microbiology, poznan university of life sciences, szydłowska 50, 60-656 poznań, [email protected] g. skrzypczak department of agronomy, poznan university of life sciences, dojazd 11, 60-632 poznan, poland r. głowicka-wołoszyn 3department of finance and accounting, poznan university of life sciences, wojska polskiego 28, 60-637 poznań, poland

field trials were conducted at the experimental station (brody) belonging to poznan university of life sciences (ne poland). the purpose was to evaluate the impact of different tillage systems and white mustard cover crop on soil enzymatic activity and severity of plant infection by pathogenic fungi in spring wheat. a randomized complete block design was set up with four replicates per treatmen...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده فنی مهندسی 1389

the poor orientation of the restaurants toward the information technology has yet many unsolved issues in regards to the customers. one of these problems which lead the appeal list of later, and have a negative impact on the prestige of the restaurant is the case when the later does not respond on time to the customers’ needs, and which causes their dissatisfaction. this issue is really sensiti...

Journal: :desert 2010
gh.r zehtabian m.k kianian a. salehpour jam

abstract soil, is a reclamable and sustainable source. it is the basis of survival and it’s implication, should be performed on the basis of productivity identification according to scientific and technical rules, we can protect this valuable source, and increase it’s productivity and usage. nowdays, saline soils cover nearly 14.6% of the country area. study areas (kashan’ playa) have saline an...

Journal: :journal of rangeland science 0
khosrw shahbazi forests and rangelands research institute of iran ali salajagheh 2faculty of natural resources, tehran university, iran mohammad jafari faculty of natural resources, tehran university, iran hassan ahmadi faculty of natural resources, tehran university, iran aliakbar nazarisamani faculty of natural resources, tehran university, iran mohammad khosrowshahi 3forests and rangelands research institute of iran

negative impacts of gully erosion in marly areas are severe due to improper landuse practices such as irrigation, tillage, overgrazing and degradation of vegetation cover. the objective of this research was to evaluate gully thresholds related to plant vegetation cover and landuse change in the agriculture (ag), fair rangeland (fr) and weak rangeland (wr) areas of ghaasr-e-shirin, kermanshah, i...

2006
ANDREW J. ELMORE SARA J. MANNING JOHN F. MUSTARD JOSEPH M. CRAINE

1. Throughout arid regions of the world, groundwater is extracted for human population centres. In the Great Basin and Range region of the USA, we lack basic information regarding some plant communities detailing the extent to which vegetation is threatened by groundwater extraction. This is particularly true for alkali meadow vegetation, which is restricted to zones of shallow groundwater yet ...

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...

2017
Daniel C. Laughlin Scott R. Abella Wallace Covington James B. Grace

Question: How are the effects of mineral soil properties on understory plant species richness propagated through a network of processes involving the forest overstory, soil organic matter, soil nitrogen, and understory plant abundance? Location: North-central Arizona, USA. Methods: We sampled 75 0.05-ha plots across a broad soil gradient in a Pinus ponderosa (ponderosa pine) forest ecosystem. W...

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