Provenance information describes the history of a dataset. In a scientific use case, provenance information can be further used to support reproducibility of data and to show collaborations among researchers. In this paper, we show how to use provenance information in scientific SDIs to show relations among research projects and between datasets. An interdisciplinary research program, in which research results (e.g. global climate change scenarios) are published in several linked geoportals serves as underlying use case. We address issues and requirements on modelling provenance on project, dataset and implementation level.