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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Drought

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Species Composition But Not Diversity Explains Recovery From The 2011 Drought In Texas Grasslands, Xia Xu, H. Wayne Polley, Kirsten S. Hofmockel, Brian J. Wilsey Mar 2017

Species Composition But Not Diversity Explains Recovery From The 2011 Drought In Texas Grasslands, Xia Xu, H. Wayne Polley, Kirsten S. Hofmockel, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

Extreme droughts can have profound direct consequences for grassland ecosystems, but it is poorly known how ecosystems recover from drought and what ecological factors are associated with recovery. Recovery occurs when ecosystem functioning returns to values observed prior to a perturbation. Here, we tested for ecosystem recovery after an extreme drought in 2011 in previously established native and exotic experimental communities in Central Texas. Planted mixtures of all native and all exotic species were crossed with a summer irrigation treatment, with eight community compositions (random draws) per treatment. Prior to the drought, native plots had higher diversity than exotic plots ...


Global Gross Primary Productivity And Water Use Efficiency Changes Under Drought Stress, Zhen Yu, Jingxin Wang, Shirong Liu, James S. Rentch, Pengsen Sun, Chaoqun (Crystal) Lu Jan 2017

Global Gross Primary Productivity And Water Use Efficiency Changes Under Drought Stress, Zhen Yu, Jingxin Wang, Shirong Liu, James S. Rentch, Pengsen Sun, Chaoqun (Crystal) Lu

Ecology, Evolution and Organismal Biology Publications

Drought can affect the structure, composition and function of terrestrial ecosystems, yet drought impacts and post-drought recovery potentials of different land cover types have not been extensively studied at a global scale. We evaluated drought impacts on gross primary productivity (GPP), evapotranspiration (ET), and water use efficiency (WUE) of different global terrestrial ecosystems, as well as the drought-resilience of each ecosystem type during the period of 2000 to 2011. Using GPP as biome vitality indicator against drought stress, we developed a model to examine ecosystem resilience represented by the length of recovery days (LRD). LRD presented an evident gradient of ...


Montane Meadow Change During Drought Varies With Background Hydrologic Regime And Plant Functional Group, Diane M. Debinski, Hadley Alexander Wickham, Kelly Kindscher, Jennet C. Caruthers, Matthew Germino Jan 2010

Montane Meadow Change During Drought Varies With Background Hydrologic Regime And Plant Functional Group, Diane M. Debinski, Hadley Alexander Wickham, Kelly Kindscher, Jennet C. Caruthers, Matthew Germino

Ecology, Evolution and Organismal Biology Publications

Climate change models for many ecosystems predict more extreme climatic events in the future, including exacerbated drought conditions. Here we assess the effects of drought by quantifying temporal variation in community composition of a complex montane meadow landscape characterized by a hydrological gradient. The meadows occur in two regions of the Greater Yellowstone Ecosystem (Gallatin and Teton) and were classified into six categories (M1–M6, designating hydric to xeric) based upon Satellite pour l’Observation de la Terre (SPOT) satellite imagery. Both regions have similar plant communities, but patch sizes of meadows are much smaller in the Gallatin region. We ...