[Enviro-lunch] Enviro-Lunch (10/15, 12-1 pm): Roots and P dynamics in the Critical Zone

[Kyungjin Min]

[image: image.png]

Hello all,

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.

Join Zoom Meeting Enviro-lunch
https://ucmerced.zoom.us/j/175736103
Meeting ID: 175 736 103
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*Title:*
Walker and Syers’ model in the critical zone: Rooting system economies
shape soil P dynamics

*Abstract: *
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.

*Bio: *
[image: image.png]
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.

KJ, Manisha, and Anna

Organizers for Fall 2020: KJ Min, Manisha Dolui, Anna Jurusik
Faculty coordinator: Asmeret Asefaw Berhe

------
You can find the semester schedule below.

*date*

*speaker*

*topic*

  9/10

Shane Franklin

@ U of Delaware

Preferential flow plays an unknown role in the carbon cycle

9/17

Crystal Kolden

@ UC Merced

The cascading consequences of wildfire: understanding and mitigating
impacts to coupled human-natural systems

9/24

Allegra Mayer

@ UC Berkeley

Soil C sequestration potential in CA grasslands with compost amendments

10/1

Govind Dev Kumar

@ UGA

Salmonella's Trojan Horse Strategy to Evade Antimicrobial Stress

10/8

Charlotte Decock

@ Cal Poly, San Luis Obispo

Soil health and fertility assessment

10/15

Emma Hauser

@ U of Kansas

Integrated rooting system development and soil development structures
ecosystem nutrient dynamics

10/22
Cancelled


10/29

Mary Salcedo

@ Virginia Tech

Form and function of insect wing veins

11/5

Todd Longbottom

@ UC Merced

Oxidative weathering of ancient organic matter and formation of modern soils

11/12

Asmeret Asefaw Berhe @ UC Merced

Finding and securing grants for students & postdocs

11/19

Adeyemi Adebiyi

@ UC Merced

How much solar radiation does atmospheric mineral dust absorb?

11/26

Thanksgiving holiday



12/3

Yamina Pressler

@ Cal Poly, San Luis Obispo

Soil food webs and organic matter in fire-affected savanna ecosystems

12/10

AGU
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