Riparian Evapotranspiration (ET) Study (SEON) from the Middle Rio Grande River Bosque, New Mexico (1999-2011): Energy Balance Data

This study originated with the objective of parameterizing riparian evapotranspiration (ET) in the water budget of the Middle Rio Grande. We hypothesized that flooding and invasions of non-native species would strongly impact ecosystem water use. Our objectives were to measure and compare water use of native (Rio Grande cottonwood, Populus deltoides ssp. wizleni) and non-native (saltcedar, Tamarix chinensis & Russian olive, Eleagnus angustifolia) vegetation and to evaluate how water use is affected by climatic variability resulting in high river flows and flooding as well as drought conditions and deep water tables. Eddy covariance flux towers to measure ET and shallow wells to monitor water tables were instrumented in 1999. Active sites in their second decade of monitoring include a xeroriparian, non-flooding salt cedar woodland within Sevilleta National Wildlife Refuge (NWR) and a dense, monotypic salt cedar stand at Bosque del Apache NWR, which is subject to flood pulses associated with high river flows. These data are energy balance data collected as part of this study.

本研究旨在对里奥格兰德河中游水量平衡中的河岸蒸散发（evapotranspiration, ET）开展参数化研究。我们提出假说：洪水事件与外来物种入侵会对生态系统水分利用产生强烈影响。本研究的目标为：测定并对比本土植被——里奥格兰德三角叶杨（Populus deltoides ssp. wizleni）——与外来植被——盐雪松（Tamarix chinensis）、俄罗斯橄榄（Eleagnus angustifolia）——的水分利用情况，并评估由河流高流量、洪水、干旱以及地下水位偏深引发的气候变异性如何影响水分利用。1999年，研究团队布设了用于测定ET的涡度协方差通量塔（eddy covariance flux towers）与监测地下水位的浅井。当前已进入第二十年监测周期的有效站点包括：塞维列塔国家野生动物保护区（National Wildlife Refuge, NWR）内的旱生河岸带无洪水干扰盐松林地，以及博斯克德尔阿帕奇国家野生动物保护区（NWR）内受高流量河流引发的洪水脉冲影响的茂密单优盐松林分。本数据集为本研究采集的能量平衡数据。