Urban residential landscapes are dynamic, varied, and complex, which makes their classification challenging (Grimm et al., 2000). Furthermore, the plant community, which is the basic unit that landscape ecologists use to classify natural landscapes, is not relevant to residential landscapes. A plant community is a group of plants whose constitution and relation to identifiable environmental conditions give them observable group identities (Hunter and Paysen, 1986). While several reports detail how large-scale (e.g., citywide) urban land cover is classified (Myeong et al., 2001; Richards et al., 1984), it is unfortunate that mainly descriptive parameters such as plant material type (Larsen and Harlan, 2006) and plant water-use characteristics (Yabiku et al., 2008) are used to classify the landscape around residences.
Larsen and Harlan (2006) toured eight Phoenix, AZ, residential neighborhoods and categorized landscapes in those neighborhoods into desert, lawn, oasis, and courtyard landscape types. They described landscape types but did not quantitatively classify the landscape type. For example, the desert landscape type was described as “a landscape that featured plants that appear consistent with the Sonoran Desert’s native plant palette.” Based on the type of vegetation and the presence or absence of an irrigation system, Martin (2003) and Yabiku et al. (2008) described residential landscapes in North Desert Village, Phoenix, AZ, as native desert, xeric, oasis, and mesic. The mesic landscape had no native desert plants, was sprinkler or flood irrigated, and had extensive turfgrass. In contrast, a xeric landscape had some native desert plants, minimal drip irrigation, and no turf (Yabiku et al., 2008).
There are solid scientific reasons to quantitatively classify urban residential landscapes. Godefroid and Koedam (2007) cautioned that many studies have failed to show a relationship between urban landscape type and plant species composition because the subunits of the landscape were not categorized quantitatively. Kenney et al. (2004) and more recently, Al-Kofahi et al. (2012a) showed that quantitative assessments of residential urban landscapes facilitate urban water conservation because accurate landscape water budgets can be calculated for those landscapes. Al-Kofahi et al. (2012b) established that accounting for the area and type of all individual materials within the landscape provided more accurate estimates of landscape water use than methods that neglected to do so.
Recognizing that urban residential landscapes change with time, are multidimensional, and heterogeneous because of human-generated plant groupings, we hypothesized that within a geographically defined area, a quantitative and repeatable method can be developed to classify urban residential landscapes. The objective of this research was to develop a quantitative and repeatable method to classify urban residential landscapes in a desert environment.
Al-KofahiS.D.VanLeeuwenD.M.SamaniZ.A.St. HilaireR.2012aA water budget calculator created for residential urban landscapes in Albuquerque, New MexicoJ. Irrig. Drain. Eng.138525533
Al-KofahiS.D.VanLeeuwenD.M.SteeleC.S.St. HilaireR.2012bMapping land cover in urban residential landscapes using very high spatial resolution aerial photographsUrban For. Urban Green.11291301
ChristiansN.2004Fundamentals of turfgrass management. Wiley Hoboken NJ
City of Las Cruces2008City of Las Cruces property and zoning information. 15 Nov. 2008. <http://mapserver.las-cruces.org/website/zoneparc/viewer.htm>
CostelloL.JonesK.S.1999A guide to estimating irrigation water needs of landscape plantings in California. Univ. California Coop. Ext. California Dept. Water Resources Sacramento CA
Dick-PeddieW.A.1975Vegetation of southern New Mexico p. 81–84. In: W.R. Seager R.E. Clemons and J.F. Callender (eds.). New Mexico Geological Society guidebook. 26th Field Conf. 23 May 2013. <http://nmgs.nmt.edu/publications/guidebooks/downloads/26/26_p0081_p0084.pdf>
GodefroidS.KoedamN.2007Urban plant species patterns are highly driven by density and function of built-up areasLandscape Ecol.2212271239
GrimmN.B.GroveJ.M.PickettS.T.A.RedmanC.L.2000Integrated approaches to long term studies of urban ecological systemsBioscience50571584
HunterS.C.PaysenT.E.1986Vegetation classification system for California: User’s guide. U.S. Dept. Agr. For. Serv. Pacific Southwest For. Range Expt. Sta. Gen. Tech. Rpt. PSW-94. 5 Apr. 2010. <http://www.fs.fed.us/psw/publications/documents/psw_gtr094/psw_gtr094.pdf>
HurdB.H.St. HilaireR.WhiteJ.M.2006Residential landscape, homeowner attitudes and water-wise choices in New MexicoHortTechnology16241246
KenneyD.KleinR.ClarkM.2004Use and effectiveness of municipal water restrictions during drought in ColoradoJ. Amer. Water Resources Assn.407787
KleinR.1989Concrete and abstract Voronoi diagrams. Springer-Verlag Berlin Germany
MartinC.A.2003Landscape water use in a desert metropolis. Consortium for the study of rapidly urbanizing regions research vignette No.1. 9 May 2009. <http://ces.asu.edu/csrur/research%20vignette%201.pdf>
MuellerE.C.DayT.A.2005The effect of urban ground cover on microclimate, growth and leaf gas exchange of oleander in Phoenix, AZIntl. J. Biometeorol.49244255
RamseyF.L.SchaferD.W.2002The statistical sleuth a course in methods of data analysis. 2nd ed. Duxbury Press Belmont CA
RichardsN.A.MalletteJ.R.SimpsonR.J.MacieE.A.1984Residential greenspace and vegetation in a mature city: Syracuse, New YorkUrban Ecol.899125
SpintiJ.E.St. HilaireR.VanLeeuwenD.2004Balancing landscape preferences and water conservation in a desert communityHortTechnology147277
St. HilaireR.ArnoldM.A.DevittD.A.HurdB.H.LesikarB.J.LohrV.I.MartinC.A.McDonaldG.V.MorrisR.L.PittengerD.R.ShawD.A.WilkersonD.C.ZoldoskeD.F.2008Efficient water use in residential urban landscapesHortScience4320812092
St. HilaireR.VanLeeuwenD.TorresP.2010Landscape preferences and water conservation choices of residents in a high desert environmentHortTechnology20308314
SunX.YangZ.2008Generalized McNemar’s test for homogeneity of the marginal distributions. 9 July 2011. <http://www2.sas.com/proceedings/forum2008/382-2008.pdf>
XieZ.WangY.JiangW.WeiX.2006Evaporation and evapotranspiration in a watermelon field mulched with gravel of different sizes in northwest ChinaAgr. Water Mgt.81173184