Trends and challenges in soil research 2009: linking global climate change to local long-term forest productivity

Xu, Zhihong; Chen, Chengrong; He, Ji‐Zheng; Liu, Juxiu

doi:10.1007/s11368-009-0060-6

Cited by 92 publications

(76 citation statements)

References 77 publications

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“…Research regarding effects of global change on soil microbial communities has focussed largely on community structure associated with a single environmental factor such as elevated [CO 2 ], nitrogen (N) deposition, and warming. However, in these experiments, effects of associated global change factors potentially varied with treatment length and type, ecosystem and soil type, and other environmental conditions (Montealegre et al 2000;Frey et al 2008;Xu et al 2009;Ge et al 2010). Given that soil microorganisms are the key drivers of soil nutrient cycling (e.g., Falkowski et al 2008), their roles in mediating climate change and ecosystem functioning are not well understood (Balser et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Abundance and community structure of ammonia oxidizing bacteria and archaea in a Sweden boreal forest soil under 19-year fertilization and 12-year warming

Long

Chen

et al. 2012

J Soils Sediments

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Purpose Boreal forests are considered to be more sensitive to global climate change compared with other terrestrial ecosystems, but the long-term impact of climate change and forest management on soil microbial functional diversity is not well understood. Ammonia-oxidizing bacteria (AOB) and archaea (AOA) are the most important players in nitrogen (N) cycling-associated processes in terrestrial ecosystems. This study investigated the separate and combined impacts of long-term soil warming and fertilization on soil AOB and AOA community structures and abundances in a Norway spruce stand in northern Sweden. Materials and methods The soil-warming experiment was established in the buffer zones of two irrigated plots (I) and complete nutrient solution plots (IL) since 1995. The warming treatment started in April each year by maintaining soil temperature on warmed plots at 5°C above the temperature in unwarmed plots using heating cables. In August 2006, soil samples were collected from eight subplots for molecular analysis. The abundance of bacterial and archaeal amoA genes was determined by quantitative polymerase chain reaction. Similarly, total bacterial and archaeal population sizes have also been determined. The diversity of AOB and AOA was assessed by constructing amoA gene clone libraries, and different genotypes were screened with restriction fragment length polymorphism. Results and discussion Results showed that fertilization did not significantly affect the abundance of the bacterial amoA gene under either warming or non-warming conditions; however, warming decreased the abundance under fertilization treatments. No significant effects of fertilization and soil warming were observed on the number of thaumarchaeal amoA gene copies across all treatments. In this study, amoA gene abundance of AOB was significantly higher than that of AOA across all treatments. The community structure of both AOB and AOA was strongly influenced by fertilization. For bacterial amoA genes, Nitrosospira cluster 2 was present across all treatments, but the only genotype was observed in the fertilization treatments while, for thaumarchaeal amoA genes, the relative abundance of soil cluster 5 increased in fertilization treatments. By comparison, soil-warming effects on AOB and AOA community structure were not significant. Canonical correspondence analysis showed a positive correlation between fertilization and both dominant genotypes of AOB and AOA. Conclusions These results indicated that the abundance of AOA and AOB was not affected by fertilization or warming alone, but the interaction of fertilization and warming reduced the abundance of AOB. The community composition of ammonia-oxidizers was more affected by the nutrientoptimized fertilization than the soil warming.

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Section: Introductionmentioning

confidence: 99%

Abundance and community structure of ammonia oxidizing bacteria and archaea in a Sweden boreal forest soil under 19-year fertilization and 12-year warming

Long

Chen

et al. 2012

J Soils Sediments

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“…45% of terrestrial C, contribute ca. 50% of terrestrial net primary production, and harbor two thirds of terrestrial biodiversity (Bonan 2008;Purves and Pacala 2008;Xu et al 2009). These forests not only provide timber and nontimber forest products, but more importantly, ecological services such as biodiversity and protection of watershed and soil resources and sequestration of C (Dixon et al 1994;Chen et al 2004a;Lamb et al 2005;Purves and Pacala 2008).…”

Section: Introductionmentioning

confidence: 99%

Forest ecosystem responses to environmental changes: the key regulatory role of biogeochemical cycling

Chen

2009

J Soils Sediments

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“…Some studies have also indicated that Hg could influence the soil particular functions which the microbes mediate, such as soil respiration, enzymatic activities, and nitrification through a combination of physiological and soil microcosm experiments (Rasmussen and Sorensen 2001;Müller et al 2002). Nitrification has been considered to be an important process in the nitrogen cycle and one of the most sensitive soil microbial processes with regard to heavy metal stress (Broos et al 2005;Xu and Chen 2006;Xu et al 2009). Therefore, the potential nitrification rate (PNR) has been used as an endpoint to evaluate the risk of contaminated soil (Smolders et al 2001).…”

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confidence: 99%

Effects of mercury on the activity and community composition of soil ammonia oxidizers

Liu

Zheng

Shen

et al. 2010

Environ Sci Pollut Res

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Purpose Experiments were conducted to examine the effects of mercury (Hg) on soil nitrification activities and the microbial communities of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA). Methods The soil samples spiked with different Hg concentrations were incubated for a period of 1, 2, 4, and 8 weeks in triplicate and the potential nitrification rate (PNR) of the samples was determined. The abundance of AOB and AOA was measured after an 8-week incubation by real-time polymerase chain reaction (PCR) assay of the amoA genes, while the community compositions by cloning and sequencing approaches. Results The soil PNR differed with different incubation periods. It tended to decrease with increasing soil Hg concentrations at week1, basing on which the half-maximal effective concentration (EC50) was 1.59 mg kg −1 . There was no significant difference in the abundance of AOB or AOA among the treatments. The AOB community was dominated by Nitrosospira-like sequences and more than 70% of the obtained clones were affiliated with the cluster 3a.2. The percentage of cluster 3a

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Trends and challenges in soil research 2009: linking global climate change to local long-term forest productivity

Cited by 92 publications

References 77 publications

Abundance and community structure of ammonia oxidizing bacteria and archaea in a Sweden boreal forest soil under 19-year fertilization and 12-year warming

Abundance and community structure of ammonia oxidizing bacteria and archaea in a Sweden boreal forest soil under 19-year fertilization and 12-year warming

Forest ecosystem responses to environmental changes: the key regulatory role of biogeochemical cycling

Effects of mercury on the activity and community composition of soil ammonia oxidizers

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