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عنوان فارسی مقاله:
اثرات منفی نیتروژن و آب اضافی بر خاک باکتریایی و جوامع قارچی در استپ مغولستان داخلی: آزمایش مزرعه
عنوان انگلیسی مقاله:
Opposing effects of nitrogen and water addition on soil bacterial and fungal communities in the Inner Mongolia steppe: A field experiment
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Grasslands make up approximately 40% of the terrestrial land surface and grassland ecosystems are affected by human induced climatic changes (Wang and Zhou, 2012). Carbon (C) sequestration by vegetation and soil can be an important mean of mitigating increasing CO2 concentrations in atmosphere (Batjes, 1998), and temperate grassland ecosystems may be an important C sink (Frank, 2002). Even though N is the major element in the atmosphere, N availability is one of the main factors that limits plant growth and most grassland ecosystems are N limited (Vitousek and Howarth, 1991; Bai et al., 2008). N-enrichment in grasslands often increases aboveground primary production and causes a decline in plant species richness (Tilman, 1987; Clark and Tilman, 2008; Pierik et al., 2011). N-Enrichment can also affect the abundance of soil-dwelling organisms such as bacteria and fungi(Bardgett et al., 1999), and can result in changes in the activity or composition of soil microbes (Fierer et al., 2012). A meta-analysis of 82 N addition studies showed that on average microbial biomass declined by 15% by N fertilization and that the strength of the effects was positively related to the amount of N added and the duration of the experiment (Treseder, 2008). The effects of N addition are closely linked to carbon dynamics and mineralization in the soil (Sinsabaugh et al., 2005; Waldrop and Zak, 2006), which in turn influence soil microbes, as the soil microbial community is sensitive to soil carbon availability (Drenovsky et al., 2004). Soil water plays an important role in the activity of the soil microbial community. It influences N-mineralization mediated by microbes (Araya et al., 2013). Also, soil water plays a key role in the transportation of nutrients, in cellular metabolism and serves as a medium for bacterial mobility (Drenovsky et al., 2004). Changes in soil water, therefore, can cause changes in the physiology and structure of the soil microbial community (Paul et al., 2003). A
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کلمات کلیدی:
[PDF]Soil bacterial and fungal community responses to nitrogen addition ... journal.frontiersin.org/article/10.3389/fmicb.2015.00891/pdf by RC Mueller - 2015 - Cited by 9 - Related articles Sep 4, 2015 - with biologically-limiting extremes in water availability, temperature, and UV ... richness and community composition of both bacterial and fungal ... The effects of N additions on soil microbial ..... Here, we show the opposite. NL Inst of Ecology on Twitter: "New Paper:Opposing Effects of ... https://twitter.com/niooknaw/status/788649401543688192 Oct 19, 2016 - Copy link to Tweet; Embed Tweet. New Paper:Opposing Effects of Nitrogen and Water addition on Soil Bacterial and Fungal... In: Appl. Soil ... Ecology of Arable Land — Perspectives and Challenges https://books.google.com/books?isbn=9400910215 M. Clarholm, L. Bergström - 2012 - Science Additions of bacterial feeders, such as bacterialfeeding nematodes and amoebae, ... Additions of fungal feeders, mainly belonging to Collembola and Acari, seem to ... rates of microbial CO2 whereas intensive grazing had the opposite effect. ... soil inoculated with soil bacteria plus protozoans contained 75% more nitrogen ... Interactive Effects of Nitrogen and Phosphorus on Soil Microbial ... https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by L Liu - 2013 - Cited by 44 - Related articles Apr 12, 2013 - We examined the effects of N and P additions on soil microbes and soil C pools ... and P addition will have opposing effects on soil microbial biomass and activity, .... Soil pH was measured in a 1∶2.5 soil/water suspension. .... (2007) reported that N input had no effect on total fungal biomass in the soils of ... Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest ... aem.asm.org/content/75/6/1589.full by J Rousk - 2009 - Cited by 521 - Related articles In addition, soil pH may control biotic factors, such as the biomass ... To do this, we studied the effects of soil pH on fungal and bacterial growth and biomass, ... The 27 resulting soil samples were sieved (<2.8 mm) in the laboratory, and water ..... pH 4.5 was on fungal and bacterial growth, and there were opposing pH effects.
