نتایج جستجو برای: microbial nitrogen

تعداد نتایج: 225216  

2007
Pamela A. Matson Peter M. Vitousek Maria Julia Mazzarino

We measured nitrogen transformations and loss following forest clearing in a relatively fertile tropical forest site. Nitrogen mineralization, nitrification, and amounts of ammonium and nitrate increased substantially in surface soils during the 6 mo following burning, then returned to background levels. The nitrogen content of microbial biomass declined to half its original value 6 mo after cl...

1999
P. G. CHAPMAN

Three techniques for estimating rumen protein degradability were used together with in vivo apparent nitrogen digestibility estimates from sheep fed dried chopped Pangola grass or Siratro. The techniques used were 1) nitrogen disappearance from nylon bags suspended in the rumen, 2) S labelling of rumen microbial protein with plant nitrogen degradability calculated as the difference between micr...

2017
Yong Zhang Shikui Dong Qingzhu Gao Shiliang Liu Hasbagan Ganjurjav Xuexia Wang Xukun Su Xiaoyu Wu

To understand effects of soil microbes on soil biochemistry in alpine grassland ecosystems under environmental changes, we explored relationships between soil microbial diversity and soil total nitrogen, organic carbon, available nitrogen and phosphorus, soil microbial biomass and soil enzyme activities in alpine meadow, alpine steppe and cultivated grassland on the Qinghai-Tibetan plateau unde...

2017
Fenglian Lv Sha Xue Guoliang Wang Chao Zhang

Atmospheric nitrogen (N) deposition profoundly alters the soil microbial communities and will thus affect nutrient cycles. The effects of N availability on microbial community, however, are not clear. We used PLFA analysis to evaluate the effects of a gradient of N addition (0, 2.8, 5.6, 11.2, and 22.4 g N m-2 y-1) for three years on the rhizospheric microbial community of Pinus tabuliformis se...

Journal: :Animal : an international journal of animal bioscience 2011
A S Santos M A M Rodrigues R J B Bessa L M Ferreira W Martin-Rosset

Having evolved as a grazing animal, a horse's digestive physiology is characterized by rapid gastric transit, a rapid but intense enzymatic digestion along the small intestine, and a long and intense microbial fermentation in the large intestine. The process of understanding and describing feed degradation mechanisms in the equine digestive system in general, and in the hindgut ecosystem in par...

Journal: :تولیدات دامی 0
علیرضا طالبیان مسعودی دانشجوی دکتری دانشگاه رازی کرمانشاه و مربی پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی استان مرکزی، اراک، ایران محمد مهدی معینی دانشیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی کرمانشاه، ایران منوچهر سوری دانشیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی کرمانشاه، ایران هرمز منصوری استادیار بازنشسته، موسسه تحقیقات علوم دامی کشور، کرج، ایران معصومه عبدلی استادیار، گروه شیمی، دانشکده علوم، دانشگاه آزاد اسلامی اراک، ایران

the possibility of manufacturing and effects of a slow release non-protein nitrogen product on ruminant nutrition were evaluated in two separate experiments. in first experiment, making of slow release component was followed by connecting branched carbon chain to the molecule of urea to reduce the degree of solubility. then, the sample product was analyzed to assess its chemical structure, and ...

2016
Qian Zhang Junjun Wu Fan Yang Yao Lei Quanfa Zhang Xiaoli Cheng

The effect of agricultural land use change on soil microbial community composition and biomass remains a widely debated topic. Here, we investigated soil microbial community composition and biomass [e.g., bacteria (B), fungi (F), Arbuscular mycorrhizal fungi (AMF) and Actinomycete (ACT)] using phospholipid fatty acids (PLFAs) analysis, and basal microbial respiration in afforested, cropland and...

2016
Yufang Shen Yingying Chen Shiqing Li

Mulching is widely used to increase crop yield in semiarid regions in northwestern China, but little is known about the effect of different mulching systems on the microbial properties of the soil, which play an important role in agroecosystemic functioning and nutrient cycling. Based on a 4-year spring maize (Zea mays L.) field experiment at Changwu Agricultural and Ecological Experimental Sta...

2002
Tom L. Richard

composting process, as one or the other is normally a limiting factor. Carbon serves primarily as an energy source for the microorganisms, while a small fraction of the carbon is incorporated in their cells. Nitrogen is critical for microbial population growth, as it is a constituent of protein which forms over 50 percent of dry bacterial cell mass. If nitrogen is limiting, microbial population...

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