1,720,986 research outputs found
Interkingdom plant-microbial ecological networks under selective and clear cutting of tropical rainforest
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Mycorrhizal and nutrient controls of carbon sequestration in tropical rainforest soil
No full texthttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chin
Long-term phosphorus addition alleviates CO2 and N2O emissions via altering soil microbial functions in secondary rather primary tropical forests
No full texthttp://dx.doi.org/10.13039/501100010256 Guangzhou Municipal Science and Technology Projecthttp://dx.doi.org/10.13039/501100012428 Central Public-interest Scientific Institution Basal Research Fund, Chinese Academy of Fishery Scienceshttp://dx.doi.org/10.13039/501100018647 RUDN Universityhttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chin
Plant Functional Traits Define Microbial Response to Nutrient Availability in Tropical Rainforest Soil
No full textABSTRACT High global inputs of nitrogen (N) compared with relatively low inputs of phosphorus (P) increase nutrient imbalances that may cause substantial shifts in plant functional traits and modulate resource utilization strategies, which are associated with soil microbial communities. These community‐level trait‐based adaptations and the responses of soil microbiomes to the projected nutrient changes remain largely unexplored. Here, we characterized the nutrient‐induced shifts in plant functional traits and microbial communities in P‐limited tropical rainforest soils by combining spatial multivariate analyses across 160 km 2 of primary and secondary tropical rainforest with an in situ 14‐year nutrient addition experiment. The links between plant traits and microbial composition depending on soil N and P contents were examined to test how vegetation regulates the responses of microbial communities to nutrient input. Elevated soil N increased P limitation and thus led to a shift in leaf traits representing a conservative economy, as indicated by increases in leaf N:P ratios and leaf dry matter content. In response to the conservative shift in plant traits, soil bacterial r‐strategists, arbuscular mycorrhizal and saprotrophic fungal guilds increased in relative abundance and thus were consistently enriched with increasing N content in soil. Addition of P to soil, however, led to increases in vegetation traits for acquisition economy, characterized by increases in leaf P content, specific leaf area, and trait diversity. With the shift to traits for acquisition in high‐P soils, the relative abundance of bacterial K‐strategists and ectomycorrhizal fungi rasied. Thus, vegetation traits have selective effects on soil microbiomes to acquire specific functions needed for P acquisition in P deficient tropical soil, which may, in turn, accelerate nutrient cycles and impact soil carbon sequestration. Our results suggest that models need to incorporate plant traits in predicting microbial dynamics and the associated functions under changing nutrient conditions.National Natural Science Foundation of China https://doi.org/10.13039/50110000180
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