Simulating the Hydrologic Impact of Arundo donax Invasion on the Headwaters of the Nueces River in Texas

Shailee Jain,James Kiniry,R Ansley,Srinivasulu Ale,Clyde Munster

doi:10.3390/hydrology2030134

Shailee Jain, James Kiniry + Show 3 more

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https://doi.org/10.3390/hydrology2030134

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Abstract

Arundo donax (hereafter referred to as Arundo), a robust herbaceous plant, has invaded the riparian zones of the Rio Grande River and the rivers of the Texas Hill Country over the last two decades. Arundo was first observed along the Nueces River in central Texas in 1995 by the Nueces River Authority (NRA). It then spread rapidly downstream due to its fast growth rate and availability of streamflow for its consumptive use, and it completely displaced the native vegetation, primarily Panicum virgatum (hereafter referred to as switchgrass) in the riparian zone. It was hypothesized that Arundo reduced streamflows due to higher water use by Arundo when compared to switchgrass. The overall goal of this study was to assess the impacts of Arundo invasion on hydrology of the headwaters of the Nueces River through observed long-term streamflow and precipitation data analysis and simulation modeling with the Soil and Water Assessment Tool (SWAT). The observed data analysis indicated that while there was no significant change in monthly precipitation between the pre-Arundo invasion (1979–1994) and post-Arundo invasion (1995–2010) periods, streamflows changed significantly showing a positive (slightly increasing) trend during the pre-invasion period and a negative (slightly decreasing) trend during the post-invasion periods. The simulated average (1995–2010) annual evapotranspiration of Arundo in the seven Hydrologic Response Units (HRUs) in which Arundo invaded, was higher by 137 mm when compared to switchgrass. The water uptake by Arundo was therefore higher by 7.2% over switchgrass. Higher water uptake by Arundo resulted in a 93 mm higher irrigation (water use from the reach/stream) annually when compared to switchgrass. In addition, the simulated average annual water yield (net amount of water that was generated from the seven Arundo HRUs and contributed to streamflow) under Arundo was less by about 17 mm as compared to switchgrass. In conclusion, model simulations indicated that Arundo invasion in the Nueces River has caused a statistically significant increase in water uptake and reduction in streamflow compared to the native switchgrass, which previously dominated the headwaters.

Highlights

IntroductionArundo donax (hereafter referred to as Arundo), known as giant cane, was originally brought into California from the Mediterranean in the 1820s to make thatched roofs, musical instruments and prevent soil erosion [1]
Arundo donax, known as giant cane, was originally brought into California from the Mediterranean in the 1820s to make thatched roofs, musical instruments and prevent soil erosion [1]
The simulated average annual water yield under Arundo was less by about 17 mm as compared to switchgrass

Summary

Introduction

Arundo donax (hereafter referred to as Arundo), known as giant cane, was originally brought into California from the Mediterranean in the 1820s to make thatched roofs, musical instruments and prevent soil erosion [1]. It later spread into different parts of the United States and invaded the riparian areas of the Rio Grande River and, since 1994, has invaded the rivers of the Texas Hill Country. The Leaf Area Index (LAI) of the Arundo species has been reported to range from 4.5 on the lower Rio Grande River in Texas [5] to 15.6 in California [6]

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