4 February, 2020 (Jung, Nature, Compensatory) Jung, M., Reichstein, M., Schwalm, C. et al. Compensatory water effects link yearly global land CO2 sink changes to temperature. Nature 541, 516-520 (2017). https://doi.org/10.1038/nature20780 Question: How do changes in temperature and water availability effect on gross primary productivity (GPP), terrestrial ecosystem respiration (TER), and net ecosystem exchange (NEE) at local and global scales? Context: Despite temperature is known to contribute to the inter annual variation (IAV) of the terrestrial carbon cycle, several studies propose that water availability play an important role in the carbon cycle relates such as the carbon balance of semi-tropics and the sensitivity to IAV.
Why do a PhD? I like to do the PhD-related activities. Studying Working in nature Analyzing and computing Writing Presenting Educating I want to learn the ecosystem modeling at a deep level. I like the liberal atmosphere of academic community. Open discussion Less strict working time I like jobs with a PhD than ones with a bachelor’s or Master’s degree. Why do a PhD abroad? There are potential advisors whose
21 January, 2020 (Brugnera, GCB, Liana) di Porcia e Brugnera, M, Meunier, F, Longo, M, et al. Modeling the impact of liana infestation on the demography and carbon cycle of tropical forests. Global Change Biology, 2019; 25: 3767– 3780. https://doi.org/10.1111/gcb.14769 Question: How much does integrating lianas into the ED2 influence the estimates of forest carbon cycle? The authors hypothesized that the impact of lianas on carbon uptake by forest would be larger in the secondary forests than in the old-growth forests since lianas showed high density in young forests.
11 January, 2020 (Piao, GCB, Phenology) Piao S, Liu Q, Chen A, et al. Plant phenology and global climate change: Current progresses and challenges. Global Change Biology, 2019;00:1–19. https://doi.org/10.1111/gcb.14619 Piao et al. (2019) reviewed the current understanding of leaf phenological processes. They suggested that four key factors are driving the phenological processes: 1) temperature, 2) photoperiod, 3) nutrient and water availability, and 4) interseasonal phenological correlations (i.e. the positive spring and autumn phenological intercorrelation).
18 December, 2019 (Fisher, NPH, JULES-ED) Fisher, R., McDowell, N., Purves, D., Moorcroft, P., Sitch, S., Cox, P., Huntingford, C., Meir, P. and Ian Woodward, F. (2010), Assessing uncertainties in a second‐generation dynamic vegetation model caused by ecological scale limitations. New Phytologist, 187: 666-681. doi:10.1111/j.1469-8137.2010.03340.x Question: How demographic processes of two-dimensional spatial scales influence simulations of community structure, and responses of ecosystems to climate change? Context:
under conceiving Useful Links Asking good questions: A well-structured and -explained essay Developing-research-questions: Contains real examples How can I choose a good topic for my research paper?: Contains a video How to write a research question: Contains visual contents and is easy to read Developing strong research questions: Contains summary tables
17 December, 2019 (Smith-Martin, NPH, Liana) Smith‐Martin, C.M., Xu, X., Medvigy, D., Schnitzer, S.A. and Powers, J.S. (2019), Allometric scaling laws linking biomass and rooting depth vary across ontogeny and functional groups in tropical dry forest lianas and trees. New Phytologist. doi:10.1111/nph.16275 Question: Do mature lianas invest less biomass in stems compared to trees? The authors tried to compare the investment strategy between lianas and trees. Do juveniles follow the same allocation patterns as mature individuals?
Which information do I have to mine from a paper for developing a research question? Every day, I receive email alerts from journals or paper-searching websites. I skim through the title list in the alerts and select ones including keywords that I am interested in. In turn, I read the abstract to grasp what the paper is about and add it to my read-later folder if I feel it is interesting.
7 December, 2019 (Bar, NPH, Fire) Bär, A., Michaletz, S.T. and Mayr, S. (2019), Fire effects on tree physiology. New Phytologist, 223: 1728-1741. doi:10.1111/nph.15871 My research group at NIFOS was invited to write a research paper for a special issue of a journal. We decided to write a paper about the lagged browning after the forest fire at April 2019. I wrote about how forest fire affects an individual tree’s physiology, referring majorly to this paper.
12 August, 2019 (Resco de Dios, AFM, FMC) Resco de Dios, V., Fellows, A.W., Nolan, R.H., Boer, M.M., Bradstock, R.A., Domingo, F. and Goulden, M.L. (2015). A semi-mechanistic model for predicting the moisture content of fine litter. Agricultural and Forest Meteorology, 203, 64-73. I read this paper to get some hints for my fuel moisture research at NIFOS. This paper developed a semi-mechanistic model in which fuel moisture content (FMC) and vapor pressure deficit (VPD) were exponentially related.
22 June, 2019 (Vinodkumar, AFM, SMC) Vinodkumar and Dharssi (2019). Evaluation and calibration of a high-resolution soil moisture product for wildfire prediction and management. Agricultural and Forest Meteorology, 264, 27-39. This paper can be a good guide for both of my researches at SNU and NIFOS. This paper used the JULES to predict soil moisture deficit (SMD), which is similar to the object of the study at SNU. On the other hand, the purpose of SMD prediction was to imporve a fire danger index, which is the same as my research at NIFOS.
15 June, 2019 (Berry, pce, FWU) Berry, Z.C., Emery, N.C., Gotsch, S.G., Goldsmith, G.R. (2019). Foliar water uptake: Processes, pathways, and integration into plant water budgets. Plant, Cell and Environment, 42, 410-423. As I saw foliar water uptake (FWU) in alert lists sometimes, I became curious about the process. So I read this paper. FWU was observed about 400 years ago (1727), but it seems like relatively new and immatured field.
8 June, 2019 (Hartmann, NPH, Mortality) Hartmann, H., Moura, C.F., Anderegg, W.R.L., Ruehr, N.K., Salmon, Y., Allen, C.D., Arndt, S.K., Breshears, D.D., Davi, H. and Galbraith, D. (2018). Research frontiers for improving our understanding of drought-induced tree and forest mortality. New Phytologist, 218(1), 15-28. This paper suggests some research frontiers (questions) about plant responses to drought. But, rather than the suggestions, I was interested in the topic of Box 1: definition of death for plants.