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Associate Professor Feike Dijkstra

HonoursMaster of Agriculture and EnvironmentMaster of Philosophy (MPhil)Doctor of Philosophy (PhD)Contact usDepartment of Environmental SciencesDepartment of Plant and Food SciencesCentre for Carbon Water FoodPlant Breeding InstitutePrecision Agriculture Laboratory Pulsford LaboratoryHydrology and Geo Information Sciences LaboratoryAnalytical Facility SymposiumFood money for hard times Conference2015 SIBS WorkshopFind a staff member resourcesSharePointAgriculture Environment Data Manager System (DC2D)DAP in actionSchool activitiesCommunity eventsScience allianceSydney Science Forum 2016 contactsRD Watt Lecture SymposiumWelcomeAwards (Current) and Friends MagazineContactFeike is a biogeochemist with curiosity about plant microbial interactions affecting carbon and nutrient cycling, especially in relation to global java prices.  in our group is dependant on rhizosphere priming, the phenomenon whereby plant root activity can accelerate (or decelerate) microbial activity and soil organic matter decomposition. Within our group we are examining how environmental factors control rhizosphere priming precisely what the consequences are for nutrient cycling and plant growth.Despite their importance, plant microbial interactions on carbon and nutrient cycling remain poorly described in ecosystem models, largely as these complex interactions remain not fully understood. Many questions on plant microbial interactions remain unanswered but they are important for an improved understanding of carbon and nutrient cycling within a changing environment. For example:How do plant microbial interactions affecting carbon and nutrient dynamics vary with belowground resource availability (nitrogen, phosphorus, water)?How do plant microbial interactions benefit plant growth?From what extent are plant microbial interactions controlled by C:N stoichiometry constraints on plant and microbial growth?To address these questions, we use field, greenhouse, and laboratory experiments, often in combination with stable isotope techniques along with other state of the art methods. Additionally we develop simple dynamic models and make use of ecosystem simulation models to higher understand the importance of plant microbial interactions for carbon and nutrient cycling in numerous types of ecosystems affected by global change.Drought effects on soil carbon and nutrient cycling mediated by rhizosphere processes. Drought effects on soil carbon storage and nutrient cycling are examined in tree, grassland and wheat cropping systems using innovative carbon and nitrogen isotope labelling techniques. This project concentrates on processes that occur in the interface between plant roots and soil which can be vital for soil carbon storage and climate feedbacks, and sustainability of natural and agro ecosystems. We have been developing and modifying process based and dynamic models to incorporate root soil interactions and predict long-term drought effects on soil carbon storage, nutrient loss, and plant productivity.Exploring beneficial GxExM interactions for crop yield: effects on soil health. The end results of wheat genotypes (G), environment (E, temperature and water stress), and management (M, crop rotation, Cheap Ray Ban UK fertilizer, and tillage) on soil health and key processes of carbon and nitrogen turnover are studied. Plant traits affecting belowground processes are seldom considered within breeding programs. However, better information about belowground plant traits is desperately needed for sustainable agriculture. Among the aims with this project is usually to link belowground traits of wheat genotypes to soil nutrient dynamics also to microbial community structure in charge of supplying nitrogen and phosphorus to plants.Impacts of biochar on soil carbon decomposition and stability. On this project the stability of biochar and native soil carbon is investigated. Biochar amendments to soil can improve soil carbon thereby mitigating climatic change. However, little is well known how biochar interacts with plant root exudation and microbes in charge of soil organic matter decomposition. In this project we have been investigating the interactive results of biochar and plant rhizodeposition on biochar and native soil carbon decomposition in cropping and intensive pasture systems.Collaborators: Balwant Singh, Lukas van Zwieten (DPI NSW), Stephen Kimber (DPI NSW), BP Singh (DPI NSW), Mark Boersma (Tasmanian Institute of Agriculture), Lynne Macdonald (CSIRO), Mark Farrell (CSIRO), Rai Kookana (CSIRO)Luo, W., Dijkstra, F., Bai, E., Feng, J., Lu, X., Wang, C., Wu, H., Li, M., Han, X., Jiang, Y. (2016). A threshold reveals decoupled relationship of sulfur with carbon and nitrogen in soils across arid and semi arid grasslands in northern China. Biogeochemistry, 127(1), 141 153. [More Information]He, M., Dijkstra, F., Zhang, K., Tan, H., Zhao, Y., Li, X. (2016). Influence of life form, Ray-ban Wayfarer taxonomy, climate, and soil properties on shoot and root concentrations of 11 elements in herbaceous plants in the temperate desert. Plant and Soil, 398(1 2), 339 350. [More Information]Carrillo, Y., Dijkstra, F., LeCain, D., Pendall, E. (2016). Mediation of soil C decomposition by arbuscular mycorrizhal fungi in grass rhizospheres under elevated CO2. Biogeochemistry, 127(1), 45 55. [More Information]

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