Leveraging the soil microbiome to enhance the sustainability of bioproduct agroecosystems in low-fertility soils

Zac, Jenni and Kieran by giant Miscanthus stand at The Wilds, OH

Due to the increasing need to feed a growing human population, growing crops for bioproducts (like bioenergy, adhesives, resins, among others) on high-fertility agricultural lands has become a less viable practice. Consequently, developing innovative management practices to efficiently grow bioproduct crops on lands with poor quality soils is imperative. Crops like giant miscanthus (Miscanthus × giganteus), hybrid willow (Salix spp.), and switchgrass (Panicum virgatum) are a low-input bioproduct crops that are promising candidates for cultivation on poor quality soils. However, questions remain about how to best grow these crops on low-quality lands, how they will perform on different types of poor-quality soils, and whether poor-quality sites can produce abundant biomass of suitable quality while maintaining or improving ecosystem services. The aim of this research is to examine whether plant-soil-microbial feedbacks can be utilized to improve the nutrient use efficiency of bioproduct crops and their associated soil microbiome on poor quality soils across Appalachia and the mid-Atlantic region, USA. This project will illuminate microbial mechanisms to improve nutrient use efficiencies, plant growth, and ecosystem services while diminishing negative impacts of bioproduct crop cultivation on poor-quality soils.

Funding: U.S. Department of Agriculture

Uncovering microbial mechanisms mediating soil C storage in a changing world

Road to field sites in Pellston, MI

Terrestrial ecosystems in the Northern Hemisphere are a globally important sink for anthropogenic CO2 in the Earth’s atmosphere, slowing its accumulation as well as the pace of climate warming. In northern temperate forests like those that cover almost 16 million acres in Wisconsin, historically high rates of anthropogenic nitrogen (N) deposition have enhanced the forest land carbon (C) sink by reducing soil organic matter (SOM) decomposition and increasing the amount of C stored in soils. Much of this increased C occurs as occluded particulate organic matter, which is a soil fraction that should be resistant to future microbial decomposition and stable over time. Although, anthropogenic N deposition has recently begun to decline across many temperate North American forests, and little is known about the fate of this forest land C sink during ecosystem recovery from historically high rates of N deposition. This research aims to identify how the microbial mechanisms that support the forest soil C sink in northern hardwood forests respond to a decline in historically high rates of anthropogenic N deposition. Data generated can be used to inform and improve ecosystem models to predict the fate of the terrestrial C sink in a changing world.

Funding: U.S. Department of Agriculture

Utilizing a trait-based approach to better understand microbial community dynamics in a model system

Sarracenia purpurea in FL

Microbial communities (microbiomes) play important roles in animals, plants, and even whole ecosystems. However, microbiomes are constantly changing through time and space. These changes can have big impacts on the health of animal or plant hosts and the functioning of entire ecosystems. For this reason, uncovering rules that govern how microbiomes change across time and space is essential for understanding how they affect their hosts and ecosystems. This research builds on previous understanding of different strategies used by microbes to survive and compete for resources and applies it to studying the ecosystem that forms in the pitchers of the carnivorous pitcher plant, Sarracenia purpurea. Through a combination of experiments and modeling, the S. purpurea microbiome will be studied to determine how microbial community functions change over time, how the host plant influences microbiome formation, and how the microbiome affects the host plant. The results will be compared with other aquatic, plant- and soil-associated microbiomes, to understand how S. purpurea pitchers can be relevant models for understanding roles of microbiomes in larger ecosystems.

Funding: U.S. National Science Foundation