干旱区生态环境知识资源中心(Arid): Evapotranspiration of Urban Landscape Trees and Turfgrass in an Arid Environment: Potential Tradeoffs in the Landscape

Arid

DOI	10.21273/HORTSCI15027-20
	Evapotranspiration of Urban Landscape Trees and Turfgrass in an Arid Environment: Potential Tradeoffs in the Landscape
	Wynne, Tamara; Devitt, Dale
通讯作者	Wynne, T
来源期刊	HORTSCIENCE
ISSN	0018-5345
EISSN	2327-9834
出版年	2020
卷号	55 期号:10 页码:1558-1566
英文摘要	Irrigation in arid urban landscapes can use significant amounts of water. Water conservation must be based on plant species and the ability to meet plant water requirements while minimizing overirrigation. However, actual evapotranspiration (ET) estimates for landscape trees and turfgrass in arid environments are poorly documented, especially direct comparisons to assess potential trade-offs. We conducted research to quantify ET of 10 common landscape tree species grown in southern Nevada and compared these values with the ET of both a warm season and cool season turfgrass species. The trees were grown in a plot with a high-density planting (256 trees/ha). A complete morphological assessment was made on each tree, and monitoring of plant water status was conducted monthly. ET was quantified with a hydrologic balance approach, irrigating based on the previous week's ET to eliminate a drainage component. Transpiration was estimated with sap-flow sensors, and evaporation was estimated by difference. Although ET in liters revealed no statistical difference based on species, there were many significant differences in tree morphological parameters (P < 0.05), such as found with basal canopy area. When ET was converted to centimeters based on standardizing the ET on a basal canopy area basis, statistically higher ET values (P < 0.05) were generated for three of the trees (Lagerstroemia indica, Gleditsia tricanthos, and Fraxinus velutina 'Modesto'). A clear separation of all tree ET values (lower ET) with turfgrass ET occurred (P < 0.001), with the exception of L. indica. Backward regression analysis revealed that all morphological and physiological parameters were eliminated with the exception of percent cover in predicting ET (cm, R-2 = 0.88, P < 0.001). In addition, a highly curvilinear relationship existed between decreasing percent tree cover and ET on a basal canopy area basis (R-2 = 0.96, P < 0.001), revealing that smaller trees located within the plot had significantly higher ET (centimeters). Tree-to-grass water use ratios demonstrated that all species except L. indica had ratios significantly below 1.0, indicating that on the basis of this study, landscapes dominated by mature trees irrigated at ET would have lower water use rates than similar areas planted to turfgrass, with the exception of the smaller L. indica. The results suggest that the smaller trees within the higher planting density plot were partially released from a negative feedback on transpiration that occurred in the larger trees based on reduced canopy atmospheric coupling.
英文关键词	evaporation planting density transpiration tree grass water use ratios
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000577188700003
WOS关键词	WATER-USE ; LEACHING FRACTIONS ; TALL FESCUE ; TRANSPIRATION ; IRRIGATION ; SOIL ; REQUIREMENTS ; EVAPORATION ; SALINITY ; TUCSON
WOS类目	Horticulture
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326751
作者单位	[Wynne, Tamara] Univ Nevada, Sch Life Sci, Las Vegas, NV 89154 USA; [Devitt, Dale] Univ Nevada, Sch Life Sci, Soil & Water, Las Vegas, NV 89154 USA
推荐引用方式 GB/T 7714	Wynne, Tamara,Devitt, Dale. Evapotranspiration of Urban Landscape Trees and Turfgrass in an Arid Environment: Potential Tradeoffs in the Landscape[J],2020,55(10):1558-1566.
APA	Wynne, Tamara,&Devitt, Dale.(2020).Evapotranspiration of Urban Landscape Trees and Turfgrass in an Arid Environment: Potential Tradeoffs in the Landscape.HORTSCIENCE,55(10),1558-1566.
MLA	Wynne, Tamara,et al."Evapotranspiration of Urban Landscape Trees and Turfgrass in an Arid Environment: Potential Tradeoffs in the Landscape".HORTSCIENCE 55.10(2020):1558-1566.