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Impact of Eastern Redcedar Proliferation on Water Resources in the Great Plains USA—Current State of Knowledge

1
Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK 74078, USA
2
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68506, USA
3
Biological Systems Engineering Department, University of Nebraska, Lincoln, NE 68506, USA
4
Grazinglands Research Laboratory, USDA, El Reno, OK 73036, USA
5
Red River Research Station, Louisiana State University Agricultural Center, Bossier, LA 71112, USA
*
Author to whom correspondence should be addressed.
Water 2018, 10(12), 1768; https://doi.org/10.3390/w10121768
Received: 13 November 2018 / Revised: 21 November 2018 / Accepted: 28 November 2018 / Published: 1 December 2018
(This article belongs to the Special Issue Ecohydrology of Woodlands and Savannas)
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Abstract

In the Great Plains of the central United States, water resources for human and aquatic life rely primarily on surface runoff and local recharge from rangelands that are under rapid transformation to woodland by the encroachment of Eastern redcedar (redcedar; Juniperus virginiana) trees. In this synthesis, the current understanding and impact of redcedar encroachment on the water budget and water resources available for non-ecosystem use are reviewed. Existing studies concluded that the conversion from herbaceous-dominated rangeland to redcedar woodland increases precipitation loss to canopy interception and vegetation transpiration. The decrease of soil moisture, particularly for the subsurface soil layer, is widely documented. The depletion of soil moisture is directly related to the observed decrease in surface runoff, and the potential of deep recharge for redcedar encroached watersheds. Model simulations suggest that complete conversion of the rangelands to redcedar woodland at the watershed and basin scale in the South-central Great Plains would lead to reduced streamflow throughout the year, with the reductions of streamflow between 20 to 40% depending on the aridity of the climate of the watershed. Recommended topics for future studies include: (i) The spatial dynamics of redcedar proliferation and its impact on water budget across a regional hydrologic network; (ii) the temporal dynamics of precipitation interception by the herbaceous canopy; (iii) the impact of redcedar infilling into deciduous forests such as the Cross Timbers and its impact on water budget and water availability for non-ecosystem use; (iv) land surface and climate interaction and cross-scale hydrological modeling and forecasting; (v) impact of redcedar encroachment on sediment production and water quality; and (vi) assessment and efficacy of different redcedar control measures in restoring hydrological functions of watershed. View Full-Text
Keywords: water balance; runoff; groundwater recharge; Great Plains; soil moisture; woody plant encroachment water balance; runoff; groundwater recharge; Great Plains; soil moisture; woody plant encroachment
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Zou, C.B.; Twidwell, D.; Bielski, C.H.; Fogarty, D.T.; Mittelstet, A.R.; Starks, P.J.; Will, R.E.; Zhong, Y.; Acharya, B.S. Impact of Eastern Redcedar Proliferation on Water Resources in the Great Plains USA—Current State of Knowledge. Water 2018, 10, 1768.

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