[ECOLOG-L] MS and PhD positions in Climate-Soil Interactions
The Lab of Climate and Soil Biogeochemistry (http://jwli.weebly.com/) seeks motivated graduate students (one MS and one PhD) starting in Spring/Fall 2017 to study human accelerated environmental changes on biogeochemical cycles of soil carbon and nutrients at molecular to global scales. The group’s interdisciplinary research integrates field and laboratory observations as well as modeling approaches to address questions that intersect external disturbances and global biogeochemical cycles. Research opportunities may include soil’s microbial and genetic level responses to global climate change and soil carbon cycle modeling. Applicants must have a Bachelor's degree or Master degree (for Ph.D. position) in soil science, microbiology, environmental science or a closely related field. Laboratory and/or field research experience is mandatory, but evidence of passion for scientific inquiry and aptitude for collaborative research are expected. To apply, please send a statement of interest, complete CV, and contact information for three professional references as a single PDF file to j...@tnstate.edu. Transcripts and GRE scores are required though unofficial copies are accepted for review purpose. Review of applicants will begin immediately and remain open until filled. Prospective applicants are welcome to contact PI (j...@tnstate.edu) with questions regarding the application submission. Principle Investigator (PI): Dr. Jianwei Li, Assistant Professor, Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville TN 37209. Website: http://www.tnstate.edu/agriculture/resumes/jianwei_li.aspx
[ECOLOG-L] Graduate student opportunity
Graduate Student Opportunity in soil microbial modeling A M.S. or Ph.D. Fellowship is available starting in Spring or Fall of 2016 at the Lab of Climate Change and Soil Biogeochemistry ( http://jwli.weebly.com/). Research topics may include soil decay modeling, abiotic and microbial interactions and feedbacks, integration of long-term datasets with soil models and data assimilation. Applicants need to be a U.S. Citizen or permanent resident for this Fellowship. Applicants must have a Bachelor's degree or M.S. degree (for PhD position) in ecology, soil science, environmental science or a closely related field. Strong desire to work with large datasets and quantitative modeling are expected. The GRA is expected to build strong collaborations with research scientists at Oak Ridge National Laboratory (http://climatechangescience.ornl.gov/). To apply, please send a statement of interest, complete CV, and contact information for two professional references as a single PDF file to j...@tnstate.edu. Transcripts and GRE scores are required though unofficial copies are accepted for review purpose. Review of applicants will begin immediately and the earliest start date is in January 2016. Questions should be addressed to Dr. Jianwei Li (j...@tnstate.edu), Department of Agriculture and Environmental Science, Tennessee State University, Nashville, Tennessee 37209. Website: http://www.tnstate.edu/agriculture/resumes/jianwei_li.aspx Tennessee State University is Nashville’s only public university, and is a comprehensive, urban, co-educational, land-grant university. TSU has rated as one of the top universities in the country by Washington Monthly for social mobility, research and community service. Founded in 1912, Tennessee State University celebrated 100 years in Nashville during 2012. The city of Nashville is a so called “capital for the music”, and along with one of the most vibrant music scenes in America, Nashville is home to a busy arts scene.
[ECOLOG-L] Graduate research assistantship in Climate Change and Soil Biogeochemistry
The recently established Lab of Climate Change and Soil Biogeochemistry seeks motivated graduate students (M.S and Ph.D.) to study human accelerated environmental changes on biogeochemical cycles at molecular to global scales. The group’s interdisciplinary research integrates field and laboratory observations as well as modeling approaches to address questions that intersect external disturbances and global biogeochemical cycles. Numerous research opportunities are available depending on the applicant's interest but may include study of 1) climatic controls on soil organic matter decomposition and greenhouse gas emission, 2) integration of model and data to improve prediction of soil and ecosystem responses to climate change, 3) land-use changes on temporal and spatial heterogeneity of soil carbon and nutrients, and 4) synthesis of iron (Fe) biogeochemistry at molecular to global scales. Applicants must have a Bachelor's degree in environmental science, soil science, biology, ecology or a closely related field. Laboratory and/or field research experience is mandatory, but evidence of robust analytical skills, passion for scientific inquiry and aptitude for collaborative research are expected. To apply, please send a statement of interest, complete CV, unofficial copies of transcript, GRE and/or TOEFL scores, and contact information for three professional references as a single PDF file to j...@tnstate.edu. Review of applicants will begin immediately and the expected start date is spring 2015. Principle Investigator: Jianwei Li, Assistant Professor, Department of Agriculture and Environmental Science, Tennessee State University, Nashville, Tennessee 37209. Website: http://www.tnstate.edu/agriculture/resumes/jianwei_li.aspx
Re: [ECOLOG-L] heterogeneity vs. variability
Dear Sanghoon, I thought of the issue for a while too. In my mind, variability is a word to be used in broad sense, but heterogeneity is one more specific. Dependent on the spatial context (known spatial location or unknown), the two words convey different level of content. Variability (variations of values) are actually spatial scale dependent(study plot or area), but many studies usually don't require an accurate record of spatial location (or pattern) of their sampling, rather, more focus on changes of "central tendency" for their research goals. I have used coefficient of variation (CV) and Cocran's C test to index variability in my study. With accurate spatial location known, variability can be well represented by heterogeneity, which can be indexed by a various of methods (trend surface analysis, autocorrlation correlograms, kriging maps). In my recent publication we explored the within-plot variability and contrasting spatial heterogeneity among three land uses. Li J, Richter DD, Mendoza A, Heine P (2010) Effects of land-use history on soil spatial heterogeneity of macro- and trace elements in the Southern Piedmont USA. Geoderma 156:60-73 Hope it helps. Thanks, Jianwei -- Jianwei Li, Ph.D Postdoctoral Researcher Department of Ecology and Evolutionary Biology Kansas Biological Survey University of Kansas Lawrence, KS 66047 Email: j...@ku.edu Office: 785-864-1564 Fax: 785-864-1534 --On Friday, May 28, 2010 6:17 PM -0400 Sanghoon Kang wrote: I was writing a paper discussing spatial heterogeneity of soil measurements. At the moment, I became confused between the concept of heterogeneity and variability. To me 'heterogeneity' contains 'spatial' context, and 'variability' has 'variations of values'. Thus 'heterogeneity of N' means 'N concentrations are different at different sampling locations', while 'variability of N' means simply 'variations of N concentration without considering locations of sample'. Then in the context of 'spatial' it seem like they become indistinguishable. But I feel like they are not exactly same. Any insight? SANGHOON KANG.
help needed on conducting Cochran's C test
Hi there, I am looking for someone who can help me know how to run Cochran's C test (a test on homogeneity of variances). I only heard that it can be done in Statistica which I am not familiar with. I wonder if someone has experience to conduct the test in Splus, SAS or R, of which I am able to handle. Thanks for your suggestion and help a lot! My email address is [EMAIL PROTECTED] Sincerely, Jianwei Li --- PhD Student School of Environment Duke University Office (919)613-8124 Email: [EMAIL PROTECTED] Homepage: <http://www.duke.edu/~jl15/>
