Title: Woody bioenergy crop selection can have large effects on water yield: A southeastern United States case study

Abstract

Short-rotation woody crops in the southeastern United States will make a significant contribution to the growing renewable energy supply over the 21st century; however, there are few studies that investigate how species selection may affect water yield. Here we assessed the impact of species selection on annual and seasonal water budgets in unvegetated plots and late-rotation 14–15-year-old intensively managed loblolly pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua L.) stands in South Carolina USA. We found that while annual aboveground net primary productivity and bioenergy produced was similar between species, sweetgum transpiration was 53% higher than loblolly pine annually and 92% greater during the growing season. Canopy interception was 10.5% of annual precipitation and was not significantly different between the two species. Soil evaporation was less than 1.3% of annual precipitation and did not differ between species, but was 26% of precipitation in unvegetated plots. Annual water yield was 69% lower for sweetgum than loblolly pine, with water yield to precipitation ratios of 0.13 and 0.39 for sweetgum and loblolly pine, respectively. If planted at a large scale, the high transpiration and low water yield in sweetgum could result in declines in downstream water availability relative to loblolly pine bymore » the end of the growing season when storage in groundwater, streams, and water supply reservoirs are typically at their lowest. Our results suggest that species selection is of critical importance when establishing forest plantations for woody bioenergy production due to potential impacts on downstream water yield.« less

Authors:

Caldwell, P. V.  ^[1];

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Jackson, C. R. ^[2]; Miniat, C. F. ^[1]; Younger, S. E. ^[2]; Vining, J. A. ^[2]; McDonnell, J. J. ^[3]; Aubrey, D. P. ^[4]

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+ Show Author Affiliations

1. USDA Forest Service, Southern Research Station, Otto, NC (United States)
2. University of Georgia, Athens, GA (United States)
3. University of Saskatchewan, Saskatoon, SK (Canada)
4. University of Georgia, Athens, GA (United States); Savannah River Site (SRS), Aiken, SC (United States)

Publication Date:

Mon Aug 06 00:00:00 EDT 2018

Research Org.:

Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL); Univ. of Georgia, Athens, GA (United States)

Sponsoring Org.:

USDOE; US Department of Agriculture (USDA)

OSTI Identifier:

1829087

Alternate Identifier(s):

OSTI ID: 1698177; OSTI ID: 1829077

Grant/Contract Number:  

FC09-07SR22506; EM0004391; 2013-67009-21405; IA09-00SR22188

Resource Type:

Accepted Manuscript

Journal Name:

Biomass and Bioenergy

Additional Journal Information:

Journal Volume: 117; Journal ID: ISSN 0961-9534

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

09 BIOMASS FUELS; short-rotation woody crops; biomass; water balance; evapotranspiration; loblolly pine; sweetgum