@article {6049,
	title = {Impacts of riparian and non-riparian woody encroachment on tallgrass prairie ecohydrology},
	journal = {Ecosystems},
	year = {2022},
	keywords = {LTER-KNZ},
	doi = {10.1007/s10021-022-00756-7},
	url = {https://link.springer.com/10.1007/s10021-022-00756-7},
	author = {Keen, Rachel M. and Jesse B. Nippert and Sullivan, P.L. and Z. Ratajczak and Ritchey, Brynn and O{\textquoteright}Keefe, K. and W. K. Dodds}
}
@article {5995,
	title = {Spatio-temporal differences in leaf physiology are associated with fire, not drought, in a clonally integrated shrub},
	journal = {AoB PLANTS},
	volume = {13},
	year = {2021},
	pages = {plab037},
	keywords = {LTER-KNZ},
	doi = {10.1093/aobpla/plab037},
	url = {https://academic.oup.com/aobpla/article/doi/10.1093/aobpla/plab037/6295325},
	author = {Wedel, E.R. and O{\textquoteright}Keefe, K. and Jesse B. Nippert and Hoch, Braden and O{\textquoteright}Connor, R.C.},
	editor = {Mitchell, Patrick}
}
@article {KNZ001804,
	title = {An assessment of diurnal water uptake in a mesic prairie: evidence for hydraulic lift?},
	journal = {Oecologia},
	volume = {183},
	year = {2017},
	month = {Feb-02-2017},
	pages = {963{\textendash}975},
	abstract = {Hydraulic lift, the passive movement of water through plant roots from wet to dry soil, is an important ecohydrological process in a wide range of water-limited ecosystems. This phenomenon may also alter plant functioning, growth, and survival in mesic grasslands, where soil moisture is spatially and temporally variable. Here, we monitored diurnal changes in the isotopic signature of soil and plant xylem water to assess (1) whether hydraulic lift occurs in woody and herbaceous tallgrass prairie species (Rhus glabra, Amorpha canescens, Vernonia baldwinii, and Andropogon gerardii), (2) if nocturnal transpiration or grazing by large ungulates limits hydraulic lift, and (3) if a dominant grass, A. gerardii, utilizes water lifted by other tallgrass prairie species. Broadly, the results shown here suggest that hydraulic lift does not appear to be widespread or common in this system, but isolated instances suggest that this process does occur within tallgrass prairie. The isolated instance of hydraulic lift did not vary by grazing treatment, nor did they result in facilitation for neighboring grasses. We suggest that the topographic complexity of this tallgrass prairie and the high rates of nocturnal transpiration observed in this study likely limit the frequency and occurrence of hydraulic lift. These results suggest that hydraulic lift can be a patchy process, particularly in heterogeneous landscapes.},
	keywords = {LTER-KNZ, Hydraulic lift, Stable, tallgrass prairie, Transpiration, Water potential},
	doi = {10.1007/s00442-017-3827-2},
	url = {https://link.springer.com/article/10.1007\%2Fs00442-017-3827-2},
	author = {O{\textquoteright}Keefe, K. and Jesse B. Nippert}
}
@article {KNZ001758,
	title = {Grazing by bison is a stronger driver of plant ecohydrology in tallgrass prairie than fire history},
	journal = {Plant and Soil},
	volume = {411},
	year = {2017},
	pages = {423-436},
	abstract = {<p>Background and Aims: Fire and grazing are important disturbances in grasslands, yet we know little about how they impact a variety of plant physiological processes such as plant ecohydrology. Here, we assessed the impact of fire history and grazing by Bison bison on the source of water uptake and niche overlap in common grassland species at the Konza Prairie Biological Station, a temperate mesic grassland located in northeastern Kansas, USA. Methods: We used the stable isotopic signature of soil and xylem water to evaluate water uptake in Andropogo n gerardii, Vernonia baldwinii, Amorpha canescens,and Rhus glabra within varying grazing (grazed, ungrazed), fire (0,1,2 or 3 years since last burn), topography (upland, lowland), and month (July, August) contrasts over 3 years (2013\&ndash;2015). Results: The presence of grazers, not fire history, altered water uptake patterns in these common grassland species. Particularly, grazing increased the proportion of shallow water utilized by A. gerardii and R. glabra, reducing niche overlap with other co-occurring species. However, these responses varied intra-annually and were often modulated by topography. Conclusions: These results suggest that grazing can alter aspects of grassland ecohydrology at small scales, which may extend to impact community and ecosystem processes at larger spatial scales.</p>},
	keywords = {LTER-KNZ, fire, Herbivory, Mesic grassland, Niche overlap, Source water, Stable isotopes},
	doi = {10.1007/s11104-016-3048-1},
	url = {https://link.springer.com/article/10.1007\%2Fs11104-016-3048-1},
	author = {O{\textquoteright}Keefe, K. and Jesse B. Nippert}
}
@article {KNZ001555,
	title = {Population origin and genome size do not impact Panicum virgatum (switchgrass) responses to variable precipitation},
	journal = {Ecosphere},
	volume = {4},
	year = {2013},
	pages = {37 -},
	abstract = {<p>Population-level adaptation to broad-scale regional climates or within-population variation in genome size of the genetically and phenotypically diverse C4 grass, Panicum virgatum (switchgrass), may influence the responses of this species to future precipitation variability associated with climate change. Therefore, we investigated P. virgatum responses to water variability between natural populations collected across a latitudinal gradient and among individuals spanning a range of genomes sizes within these populations. P. virgatum plants from natural populations originating from Kansas, Oklahoma, and Texas, U.S.A, received frequent, small precipitation events (\&ldquo;ambient\&rdquo;) or infrequent, large precipitation events (\&ldquo;altered\&rdquo;) to simulate contrasting rainfall variability expected for this region. We measured leaf-level physiology, aboveground biomass and genome size for each individual. Gas exchange rates and aboveground biomass varied significantly by population origin but did not differ by genome size. Altered precipitation treatments reduced leaf-level physiological rates; however this result did not vary by population or genome size. Our results suggest that trait variation in P. virgatum is primarily attributed to population-level adaptation across a latitudinal gradient, not genome size, and that neither population-level adaptation nor genome size may be important predictors of P. virgatum responses to future climatic conditions.</p>},
	keywords = {LTER-KNZ},
	doi = {10.1890/ES12-00339.1},
	url = {https://esajournals.onlinelibrary.wiley.com/doi/full/10.1890/ES12-00339.1},
	author = {O{\textquoteright}Keefe, K. and Tomeo, N. and Jesse B. Nippert and Springer, C.J.}
}
