Representative Soil Profiles

Soils Plants and Invasion

Plants live in tight association with microbes, especially belowground where fungi and bacteria live on and inside the roots of plants.  The relationship can be beneficial or harmful to the plant.   Some microbes cause plant diseases by decomposing roots.  Others trade nutrients with the roots in return for sugars produced aboveground by leaves.  

We investigate two main aspects of the relationship between plants and microbes in the soil.  First, as it pertains to weeds, we want to know if soil microbes can help or hinder plant invasions.  Three highly invasive weeds of contrasting life history strategies; cheatgrass, knapweed and leafy spurge, co-occur with remnants of native plant vegetation.  This creates a unique opportunity to observe, characterize, and manipulate interactions between plants and belowground microbial communities.  We outline a number of short, intermediate and long-term research projects that will significantly enhance our knowledge regarding plant microbe interactions and soil processes, with the overall goal to better understand, predict and counteract plant invasions, and to restore and manage invaded ecosystems.

Second, we seek to understand how the relationship between plants and soil influences the function of ecosystem processes.  Soil microbes are responsible for organic matter decomposition and nutrient cycling between the atmosphere and the land.  On this project we collaborate with the Earth Microbiome Project (EMP).  The goal is to map and understand the diversity of microorganisms in habitats around the world.  We mapped microbial diversity and function across gradients of weed invasions.