Skip to Main Content
Long-term monitoring of Sacramento Shade program trees: tree survival, growth and energy-saving performanceAuthor(s): Yekang Ko; Jun-Hak Lee; E. Gregory McPherson; Lara A. Roman
Source: Landscape and Urban Planning. 143: 183-191
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (755.24 KB)
DescriptionLong-term survival and growth of urban forests are critical to achieve the targeted benefits of urban tree planting programs, such as building energy savings from tree shade. However, little is known about how trees perform in the long-term, especially in residential areas. Given this gap in the literature, we monitored 22-years of post-planting survival, growth, and energy saving performance of shade trees in Sacramento, California. Using field surveys, aerial photo interpretation and survival analysis, we calculated cumulative survivorship and compared measured with projected tree growth. Using Shadow Pattern Simulator and Micropas (building energy simulation), combined with survival and growth observations, we modeled the current energy savings produced by the program trees and then compared this result with initial projections from the early years of the program. The 22-year post planting survivorship was 42.4%, considerably less than the initial projection. On average, measured growth rates were within expected ranges to provide shading benefits; 22-year old trees reached 74.6% and 68.8% of the projected 30-year mature size for tree heights and crown diameters, respectively. Annual energy savings were 107 kW h per property and 80 kW h per tree, which were 23% and 52% of the initial projection, respectively. Lower survivorship was the primary factor influencing lower cooling savings. Medium-sized trees had higher survivorship and growth attainment compared to other trees. This study contributes to more accurate quantification of urban greening performance, helping urban forest managers make data-driven decisions.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKo, Yekang; Lee, Jun-Hak; McPherson, E. Gregory; Roman, Lara A. 2015. Long-term monitoring of Sacramento Shade program trees: tree survival, growth and energy-saving performance. Landscape and Urban Planning. 143: 183-191.
KeywordsMonitoring, Residential, Survivorship, Tree mortality, Urban ecosystem, Yard tree
- Factors affecting long-term mortality of residential shade trees: evidence from Sacramento, California
- Monitoring Million Trees LA: Tree performance during the early years and future benefits
- Simulation of tree shade impacts on residential energy use for space conditioning in Sacramento
XML: View XML