Alison Post

View Calendar
January 23, 2023 11:30 am - 12:30 pm

Grassland Responses to a Changing Climate

Alison Post

Postdoctoral Scientist

Center for Ecosystem Science and Society

Northern Arizona University

Abstract

As a result of climate change, much of the world is experiencing warmer temperatures and altered precipitation patterns, such as more frequent extreme droughts and large rainstorms. Given that grasslands cover 40% of the Earth’s land area and play a critical role in the global carbon cycle, it is important to understand how this ecosystem will respond to climate change. In this talk, I will present results from several different projects that explore grassland responses to various aspects of climate change. First, I will discuss the results of two field experiments and a complementary remote sensing project that examined the response of a semiarid shortgrass prairie (Colorado, USA) to more extreme precipitation patterns. We found this grassland to be highly sensitive to both the size and timing of large rain events (deluges), which are predicted to become more frequent in this region due to climate change. Next, I will present results from a modeling study that used repeat digital photography data from the PhenoCam Network to determine the climate drivers of spring green-up across all North American grasslands. Existing models poorly predict the timing of spring green-up in grasslands, likely because most do not incorporate water availability, a primary limiting factor for grassland plants. Our new models performed substantially better, with the best model requiring sufficient precipitation followed by warm temperatures to trigger spring onset in grassland ecosystems. Using this new model and projected future climate data, we found that spring is predicted to occur up to two weeks earlier across many North American grasslands within the next 100 years. Through a combination of fieldwork, remote sensing, and modeling studies, we can improve our understanding of how climate change will influence grassland ecosystems, and thus, the impact on the global carbon cycle.

 

Related upcoming events

  • March 4, 2024 11:30 am - March 4, 2024 12:30 pm

    Abstract : Think a healthy plant is just a vibrant green? Think again! While we often judge a plant's health solely by its verdant facade, a hidden symphony plays beneath the surface, a language of temperature variations that reveals their true well-being. This seminar invites you to embark on a captivating journey beyond the visible spectrum, exploring the fascinating world of thermal imaging. Imagine this technology as a plant whisperer, translating subtle shifts in temperature into a visual language that unveils the hidden dynamics of vegetation, from individual leaves to sprawling fields. We'll delve into the secret language of plants, deciphering how they communicate their health, stress levels, and water needs through these thermal variations.

    Bio: Mostafa Javadian is a postdoctoral scientist in Richardson's lab at the Center for Ecosystem Science and Society at Northern Arizona University. His research focuses on leaf energy balance modeling using thermal infrared imagery. Previously, he was a postdoctoral research associate at the University of Arizona, specializing in remote sensing of the environment with an emphasis on detecting vegetation water stress. Mostafa earned his undergraduate degree in civil engineering before pursuing a Master’s degree in water resources management and engineering in Iran. He then earned his Ph.D. in hydrology and remote sensing from the University of Arizona in May 2022, with a focus on drylands water stress dynamics. His work contributes to advancing our understanding of ecosystem health and resilience through innovative remote sensing techniques at multiple scales.

  • March 11, 2024 - March 15, 2024 All day
    No additional details for this event.
  • March 18, 2024 11:30 am - March 18, 2024 12:30 pm

    Carbon and Water Fluxes

  • March 25, 2024 11:30 am - March 25, 2024 12:30 pm

    Sustainability

  • April 1, 2024 11:30 am - April 1, 2024 12:30 pm

    Urban Ecology

  • April 8, 2024 11:30 am - April 8, 2024 12:30 pm

    Phenology

  • April 15, 2024 11:30 am - April 15, 2024 12:30 pm

    Kimberly Dibble, NPS

    KC Cushman, ORNL

    Soren Weber, ORNL

    Nicola Falco, Berkeley Lab

    Lucas Heintzman, USDA

    Cameron McIntire, USDA

     

  • April 22, 2024 11:30 am - April 22, 2024 12:30 pm

    Earth System Modeling

  • April 29, 2024 11:30 am - April 29, 2024 12:30 pm

    Microbes and Soil

  • May 6, 2024 - May 10, 2024 All day
    No additional details for this event.