Arid
DOI10.3390/w10111607
Spatial and Temporal Variability of the Impacts of Pinyon and Juniper Reduction on Hydrologic and Erosion Processes Across Climatic Gradients in the Western US: A Regional Synthesis
Williams, C. Jason1; Snyder, Keirith A.2; Pierson, Frederick B.3
通讯作者Williams, C. Jason
来源期刊WATER
ISSN2073-4441
出版年2018
卷号10期号:11
英文摘要

Pinyon (Pinus spp.) and juniper (Juniperus spp.) woodlands are an important vegetation type in the Great Basin, Colorado Plateau, and southwestern desert regions of the western US that is undergoing substantial changes associated with land management, altered disturbance regimes, and climate change. We synthesized literature on the ecohydrologic impacts of pinyon and juniper tree reductions across plot to watershed scales, short- and long-term periods, and regional climatic gradients. We found that the initial plot- to hillslope-scale ecohydrologic and erosion impacts of tree reduction on pinyon and juniper woodlands by fire, mechanical tree removal, or drought depend largely on: (1) the degree to which these perturbations alter vegetation and ground cover structure, (2) initial conditions, and (3) inherent site attributes. Fire commonly imparts an initial increased risk for hillslope runoff and erosion that degrades over time with vegetation and ground cover recovery whereas tree reductions by mechanical means pose fewer initial negative ecohydrologic impacts. Tree reduction by either approach can enhance understory vegetation and improve site-level ecohydrologic function over time, particularly on sites with an initially favorable cover of native herbaceous vegetation and a cool-season precipitation regime. Understory vegetation and ground cover enhancements appear to increase ecohydrologic resilience of some woodland communities to disturbances such as drought, fire, and insect infestations. In contrast, intensive land use, prolonged drought or repeated burning associated with invasions of fire-prone grasses can propagate long-term site degradation through persistent elevated runoff and erosion rates. Our synthesis suggests the annual precipitation requirement for increases in plot- to hillslope-scale soil water availability for herbaceous enhancement through tree removal likely ranges from 200-400 mm for sites in the Great Basin and northern Colorado Plateau (cool-season precipitation regimes), and, although suggested with great uncertainty, likely exceeds 400 mm for woodlands with rain-dominated precipitation regimes in the southwestern US. Overall, literature is inconclusive regarding tree reduction impacts on watershed-scale changes in groundwater and streamflow. To date, there is little evidence that drought-related changes to vegetation in pinyon and juniper woodlands substantially affect watershed-scale water availability and streamflow at the annual time scale. Our synthesis identifies key knowledge gaps to overcome in improving understanding of the ecohydrologic and erosion impacts of broadly occurring pinyon and juniper tree reductions in the western US.


英文关键词climate change cutting die-off drought ecohydrology evapotranspiration fire groundwater hydrologic connectivity interception pattern-process rangelands recharge runoff soil water structure-function tree mortality tree removal water yield woodlands woody plant encroachment
类型Review
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000451736300114
WOS关键词INDUCED TREE MORTALITY ; PLANT COMMUNITY RESPONSES ; SOIL-WATER REPELLENCY ; STORM KING MOUNTAIN ; NORTHERN NEW-MEXICO ; SAGEBRUSH-STEPPE ; DIE-OFF ; BROMUS-TECTORUM ; PRESCRIBED-FIRE ; GREAT-BASIN
WOS类目Water Resources
WOS研究方向Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/213649
作者单位1.ARS, Southwest Watershed Res Ctr, USDA, Tucson, AZ 85719 USA;
2.ARS, Great Basin Rangelands Res Unit, USDA, Reno, NV 89512 USA;
3.ARS, Northwest Watershed Res Ctr, USDA, Boise, ID 83712 USA
推荐引用方式
GB/T 7714
Williams, C. Jason,Snyder, Keirith A.,Pierson, Frederick B.. Spatial and Temporal Variability of the Impacts of Pinyon and Juniper Reduction on Hydrologic and Erosion Processes Across Climatic Gradients in the Western US: A Regional Synthesis[J],2018,10(11).
APA Williams, C. Jason,Snyder, Keirith A.,&Pierson, Frederick B..(2018).Spatial and Temporal Variability of the Impacts of Pinyon and Juniper Reduction on Hydrologic and Erosion Processes Across Climatic Gradients in the Western US: A Regional Synthesis.WATER,10(11).
MLA Williams, C. Jason,et al."Spatial and Temporal Variability of the Impacts of Pinyon and Juniper Reduction on Hydrologic and Erosion Processes Across Climatic Gradients in the Western US: A Regional Synthesis".WATER 10.11(2018).
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