User profiles for R. M. Keen

Rachel Keen

Postdoctoral Researcher, University of Kansas & Kansas Biological Station (KBS)
Verified email at ksu.edu
Cited by 160

Embracing the dynamic nature of soil structure: A paradigm illuminating the role of life in critical zones of the Anthropocene

…, EL Aronson, HR Barnard, SA Banwart, RM Keen… - Earth-Science …, 2022 - Elsevier
Soils form the skin of the Earth’s surface, regulating water and biogeochemical cycles and
generating production of food, timber, and textiles around the world. Changes in soil and its …

Changes in tree drought sensitivity provided early warning signals to the California drought and forest mortality event

RM Keen, SL Voelker, SYS Wang… - Global Change …, 2022 - Wiley Online Library
Climate warming in recent decades has negatively impacted forest health in the western
United States. Here, we report on potential early warning signals (EWS) for drought‐related …

Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle

…, R Clisby, Y Fang, A Menzel, RM Keen… - New …, 2020 - Wiley Online Library
The ratio of leaf internal (c i ) to ambient (c a ) partial pressure of CO 2 , defined here as χ, is
an index of adjustments in both leaf stomatal conductance and photosynthetic rate to …

Impacts of riparian and non-riparian woody encroachment on tallgrass prairie ecohydrology

RM Keen, JB Nippert, PL Sullivan, Z Ratajczak… - Ecosystems, 2023 - Springer
Woody encroachment has impacted grassland ecohydrology worldwide, prompting management
strategies aimed at woody vegetation removal to prevent or mitigate loss of water yield. …

A new strain of Leuconostoc oenos for induced malo-lactic fermentation in eastern wines

RB Beelman, A Gavin, RM Keen - American Journal of …, 1977 - Am Soc Enol Viticulture
A bacterium, isolated from a red table wine made in the laboratory from French-hybrid
grapes grown in Pennsylvania following a spontaneous malo-lactic fermentation, was …

Trajectories and state changes of a grassland stream and riparian zone after a decade of woody vegetation removal

WK Dodds, Z Ratajczak, RM Keen… - Ecological …, 2023 - Wiley Online Library
Riparian zones and the streams they border provide vital habitat for organisms, water quality
protection, and other important ecosystem services. These areas are under pressure from …

Save or spend? Diverging water‐use strategies of grasses and encroaching clonal shrubs

RM Keen, BR Helliker, KA McCulloh… - Journal of …, 2024 - Wiley Online Library
Keen collected data and performed laboratory analyses with … Keen analysed the data
with substantial input from Jesse B. … Keen led the writing process, and all authors provided …

Stronger influence of growth rate than severity of drought stress on mortality of large ponderosa pines during the 2012–2015 California drought

RM Keen, SL Voelker, BJ Bentz, SYS Wang, R Ferrell - Oecologia, 2020 - Springer
Forests in the western United States are being subject to more frequent and severe drought
events as the climate warms. The 2012–2015 California drought is a recent example, …

Contrasting shrub and grass hydraulic responses to experimental drought

K O'Keefe, JB Nippert, RM Keen, KA McCulloh - Oecologia, 2024 - Springer
Keen, unpublished data). Additional work has shown that these grasses have thin, dense
shallow roots (Tucker et al. 2011) that exhibit anatomical traits resulting in high theoretical …

Combined effects of fire and drought are not sufficient to slow shrub encroachment in tallgrass prairie

RM Keen, S Bachle, M Bartmess, JB Nippert - Oecologia, 2024 - Springer
Woody encroachment—the spread of woody vegetation in open ecosystems—is a common
threat to grasslands worldwide. Reversing encroachment can be exceedingly difficult once …