<div dir="ltr"><div><div><img src="cid:ii_kg7b85yu1" alt="image.png" width="353" height="94"><br><br></div></div><div>Hello all,<br><br>Hope you are doing fine. This week Emma Hauser, a PhD candidate at the University of Kansas (advisor: Dr. Sharon Billings) shares her research on the role of roots in shaping soil phosphorus dynamics. Please join us on Oct 15th between 12-1 pm.<br><br>Join Zoom Meeting Enviro-lunch<br></div><div><a href="https://ucmerced.zoom.us/j/175736103" target="_blank">https://ucmerced.zoom.us/j/175736103</a><br></div><div></div><div>Meeting ID: 175 736 103<br>One tap mobile<br>+16699006833,,175736103# US (San Jose)<br>+16468769923,,175736103# US (New York)<br> <br><b>Title:</b><br>Walker and Syers’ model in the critical zone: Rooting system economies shape soil P dynamics<br> <br><b>Abstract: </b><br>Soil nutrient stocks come in multiple forms that change over time. However, we lack clarity about the ways plants obtain nutrients from these different stocks and under what conditions plant nutrient sources change. In this study, we examine the hypothesis that plants transition to utilizing dominantly mineral-bound nutrient stocks over time as a consequence of their rooting systems’ carbon economies. We also hypothesize that roots’ economies are plastic and therefore are able to change C allocation patterns to leverage available nutrient stocks. We conducted two complementary studies to examine these hypotheses, one at an ecosystem scale and one at the root scale. The ecosystem scale study demonstrated that forest nutrient economies transition from utilizing dominantly organic matter-bound nutrients to mineral-bound nutrients as roots proliferate more deeply over time. This nutritional transition is likely a result of differing C costs between root construction and exudates that liberate nutrients from mineral vs. organic forms. We paired this study with a greenhouse study examining roots planted in organic, mineral, or combined media to examine whether root systems employ different strategies when presented with these nutrient sources. Early analyses hint that root distributions vary according to nutrient form. In light of impending global P scarcity, as well as global changes to the distributions of roots via land use and climate change, these results will help reveal mechanisms by which rooting systems tap into soil P stocks and how they may redistribute those stocks in ways affecting both future P availability and C cycling. <br> <br><b>Bio: </b><br><div><img src="cid:ii_kg7b5gmo0" alt="image.png" width="166" height="209"><br></div>I am a doctoral candidate in Dr. Sharon Billings’ lab at the University of Kansas. My research examines the nutrient economies of plants’ rooting systems, in particular the carbon exchanges plants make for phosphorus and the implications of these exchanges for phosphorus cycling. I have conducted much of my graduate research through the Critical Zone (CZ) Observatory Network, which has fostered my love for ecosystem scale thinking. I hope to combine my background in geology and agroecology with my growing CZ knowledge to address questions surrounding climate smart agriculture and phosphorus scarcity in the next steps of my research. <br> <br>KJ, Manisha, and Anna<br> <br>Organizers for Fall 2020: KJ Min, Manisha Dolui, Anna Jurusik<br>Faculty coordinator: Asmeret Asefaw Berhe<br> <br>------<br>You can find the semester schedule below. <br></div><div>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><b><span>dat<span style="color:black">e</span></span></b></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><b><span style="color:black">speaker</span></b></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><b><span style="color:black">topic</span></b></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black"> </span><span><span style="color:black"> </span></span><span style="color:black">9/10</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Shane Franklin</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ U of Delaware</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Preferential flow plays an unknown role in the carbon cycle</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span>9/17</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>Crystal Kolden</span><span><span> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>@ UC Merced</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>The cascading consequences of wildfire: understanding and mitigating impacts to coupled human-natural systems</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">9/24</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black"><span>Allegra</span> Mayer</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ UC Berkeley</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Soil C sequestration potential in CA grasslands with compost amendments</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">10/1</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Govind Dev Kumar</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>@ UGA</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Salmonella's Trojan Horse Strategy to Evade Antimicrobial Stress</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">10/8</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Charlotte Decock</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ Cal Poly, San Luis Obispo</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Soil health and fertility assessment</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">10/15</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Emma Hauser</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>@ U of Kansas</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Integrated rooting system development and soil development structures ecosystem nutrient dynamics</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">10/22</span></font></span></p>
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<font size="2">Cancelled</font><br></td>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black"><br></span></font></span></p>
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<p style="margin:0in;text-align:center" align="center"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">10/29</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Mary Salcedo</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span>@ Virginia Tech</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Form and function of insect wing veins</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">11/5</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Todd Longbottom</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ UC Merced</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Oxidative weathering of ancient organic matter and formation of modern soils</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">11/12</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Asmeret Asefaw Berhe</span><span><span style="color:black"> </span></span><span>@ UC Merced</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Finding and securing grants for students & postdocs</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">11/19</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Adeyemi Adebiyi</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ UC Merced</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">How much solar radiation does atmospheric mineral dust absorb?</span></font></span></p>
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<p style="margin:0in;text-align:center" align="center"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">11/26</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Thanksgiving holiday</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black"> </span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">12/3</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Yamina Pressler</span><span><span style="color:black"> </span></span></font></span></p>
<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">@ Cal Poly, San Luis Obispo</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">Soil food webs and organic matter in fire-affected savanna ecosystems</span></font></span></p>
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<p style="margin:0in;text-align:right" align="right"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">12/10</span></font></span></p>
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<p style="margin:0in"><span style="font-family:arial,sans-serif"><font size="2"><span style="color:black">AGU</span></font></span></p>
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