Building A Mechanistic Understanding Of Biodiversity And Ecosystem Functioning In Forests

Biodiversity supports the productivity, resilience, and functioning of ecosystems over time. However, the underlying mechanisms of how biodiversity begets ecosystem function are still being uncovered. I sought to understand how tree diversity could influence local resource pools of light, water, and nutrients, thereby affecting the growth, stress, and mortality of trees living in the area. I studied trees in a forest biodiversity experiment at different spatial and temporal scales using remote sensing, leaf-level physiological measurements, and soil analyses. First, I found that fast-growing, early successional tree species created a buffered microclimate (reduced daily amplitude of vapor pressure deficit) within forest canopies, relieving physiological stress of slower-growing trees and contributing to increased complementarity in forest stands. Secondly, I uncovered how forest diversity could facilitate the growth and survival of slower-growing trees by increasing potential for carbon gain while reducing stress from excess light exposure and disease. Thirdly, I examined relationships between nitrogen cycling and forest productivity, mediated by tree diversity, tree community composition, litter inputs, and soil microbes. Finally, I collaborated with a team of artists and scientists, using socially engaged art to co-create ecological understanding with broader communities. This research highlights the interconnectedness between trees, abiotic factors, and different trophic levels – including people. A deep understanding of how tree diversity and community composition can influence individual tree physiology and ecosystem functioning can help inform sustainable stewardship of forests for current and future generations.

Author dc:creator

• Park, Maria

• Biodiversity-ecosystem function
• Forests
• Microenvironments
• Plant ecophysiology
• Remote sensing
• Socially engaged art

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/11299/279268

OAI identifier oai:identifier

oai:conservancy.umn.edu:11299/279268