Beyond the Great Debate: Assessing Post Installation Manufactured Soils Performance
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1 Beyond the Great Debate: Assessing Post Installation Manufactured Soils Performance Kelby Fite, PhD Bartlett Research Labs Eric Kramer, ASLA Reed Hilderbrand Bryant Scharenbroch, PhD Morton Arboretum Robert Uhlig, ASLA Halvorson Design Partnership
2 WHY ARE WE HERE? Previous panels and discussions have raised significant unanswered questions. We recognize that there is a lack of data after a project s substantial completion. We want to look beyond visual assessments and anecdotes. We want to be better equipped to make design, implementation, and management decisions.
3 LEARNING OBJECTIVES Learn to make informed soil design decisions based on postconstruction performance assessments of a range of soil types and conditions Review objective post-occupancy testing of CU, Sand-Based, and traditional blended soils Understand how structural, chemical, and biological metrics have evolved in soils in place up to 45 years and how they relate to tree growth rates and tree performance Learn best practice techniques for post-installation management of manufactured soils
4 OUR TEAM Kelby Fite, PhD Bartlett Research Labs Eric Kramer, ASLA Reed Hilderbrand Bryant Scharenbroch, PhD Morton Arboretum Robert Uhlig, ASLA Halvorson Design Partnership
5 SOIL TYPES Native Loam Cornell University Sand Based Sand Based Cornell University Horticultural Soil Large Gravel = G >6 mm (%) Small Gravel = G 6-2 mm (%) Sand = S mm (%) Silt = Si mm (%) Clay = C <0.002 mm (%)
6 THE SITES
7 THE SITES Boston Convention Center Spaulding Hospital
8 THE SOILS
9 THE TREES TREE CONDITION Condition (dead) >½ of the crown dead and sloughing bark (poor) <½ of crown dead, severely stunted (fair) reduced growth, chlorosis, minor dieback (good) no stress and high growth rates TREE CONDITION INDEX TCI- Crown >50% dieback 25-50% dieback minor stress, reduced growth, chlorosis no signs of stress and relatively high growth TCI- Stem cavities, large cracks, extensive decay, fungi decay, cambial damage, many structural defects mostly solid with few structural defects solid throughout with good structure TCI- Root no root flares, no taper, girdling roots, fungi no root flares, but taper evident visible root flares that are appear unbalanced visible root flares that appear balanced URBAN TREE HEALTH* Ratio No live crown 1-20% 21-40% 41-60% 61-80% % Opacity No live crown 1-20% 21-40% 41-60% 61-80% % Vitality No live crown 1-20% 21-40% 41-60% 61-80% % Growth No live crown <5 cm 5-10 cm cm cm >20 cm Quality No live crown 1-20% 21-40% 41-60% 61-80% % *Ratio is the % of the live crown height to the total live tree height. Opacity is the % of light visibility blocked by branches, foliage, and BOND, JERRY URBAN TREE HEALTH. A PRACTICAL AND PRECISE ESTIMATION METHOD
10 THE DATABASE
11 THE SITES
12 CHRISTIAN SCIENCE CENTER HORTICULTURAL SOIL
13 CHRISTIAN SCIENCE CENTER HORTICULTURAL SOIL
14 POST OFFICE SQUARE HORTICULTURAL SOIL
15 POST OFFICE SQUARE HORTICULTURAL SOIL
16 POST OFFICE SQUARE HORTICULTURAL SOIL
17 BUCKINGHAM BROWN, NICHOLS CORNELL UNIVERSITY SOILS
18 BUCKINGHAM BROWN, NICHOLS CORNELL UNIVERSITY SOILS
19 HONAN ALLSTON LIBRARY CORNELL UNIVERSITY SOILS
20 HONAN ALLSTON LIBRARY CORNELL UNIVERSITY SOILS
21 SOUTH BOSTON MARITIME PARK SAND BASED SOILS
22 SOUTH BOSTON MARITIME PARK SAND BASED SOILS
23 CENTRAL WHARF PLAZA SAND BASED SOILS
24 CENTRAL WHARF PLAZA SAND BASED SOILS
25 R F KENNEDY GREENWAY SAND BASED SOILS
26 R F KENNEDY GREENWAY SAND BASED SOILS
27 SOIL SECTION ANALYSIS
28 RELATING SOILS + TREES
29 TREE CORE ANALYSIS
30 TREE GROWTH RATE Variation in species, size, age, site conditions and management strategies all influence tree growth rate. H = HARDSCAPE P = PLANTING
31 TREE GROWTH RATE In Sand-Based applications tree diameter growth appears to be reduced in soil under pavement, where organic matter volume is lower. CWP SBMP H P H P H H P 2008 planting. 12 cal H H P 2003 planting H = HARDSCAPE P = PLANTING
32 TREE GROWTH RATE Diameter growth trends were higher and more variable in Sand-Based Soils, but diameter growth may not be the most important metric.
33 TREE GROWTH RATE Yearly growth variability within the Sand-Based sites is more pronounced. Sand-Based Soil properties were also variable, a likely influence on tree performance. CU Soil SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
34 TREE CONDITION Is tree condition a better rating? Even though Sand-Based Soils trended towards more growth, this did not translate into higher quality trees. Management strategies and site conditions also play a critical role in these data.
35 UNDERSTANDING SOIL PHYSICAL PROPERTIES
36 COARSE MATERIAL CU have high and variable amounts of course material. Sand-Based Soils under pavement have high amounts in the upper profile. Hort Soils have more uniform coarse material throughout the profile. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
37 FINE MATERIAL CU Soils show higher fine material at greater depths. Sand-Based have lower fine material, especially at depth. Fines appear to leach over time, especially in Hort Soils. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
38 SOIL MOISTURE Moisture tends to decrease with depth in all soils. Sand-Based Soils have high variability, but tend to be wetter in planting compared to hardscape. Older Hort Soils have higher soil moisture levels. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
39 BULK DENSITY In naturally-occurring soils, bulk density is higher at greater depths. The opposite is usually true in urban soils. Density tends to increase with depth in soils in planting beds. Density is highest at the surface in Sand-Based Soils that support pavement. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
40 UNDERSTANDING SOIL CHEMICAL PROPERTIES
41 SOIL P H CU Soils are more alkaline, Sand-Based are variable and Hort Soils tend towards acidic. Soils under hardscape tend more alkaline, likely due to pavement weathering. Hort Soils are more acidic, likely due to biological activity and decomposition. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
42 ELECTRICAL CONDUCTIVITY Sand-Based Soils had higher conductivity at greater depth, likely from salts. Salinization with depth in Sand-Based Soils is likely from weathering of pavement or a relative decrease in leaching. Electrical conductivity tends to be higher in CU compared to Hort Soils. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
43 UNDERSTANDING SOIL BIOLOGICAL PROPERTIES
44 MICROBIAL RESPIRATION Relatively high respiration at HAL was likely due to input of fresh organic material. Planting areas had greater respiration compared to hardscape in Sand- Based sites. Hort Soils had increased respiration with time and organic matter. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
45 ORGANIC MATTER Relatively high respiration at HAL was likely due to input of fresh organic material. Planting areas had greater respiration compared to hardscape in Sand- Based sites. Hort Soils had increased respiration with time and organic matter. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
46 ORGANIC MATTER Organic matter is a control of microbial activity. Organic matter is a soil colloid with control on soil moisture. Organic matter is a key soil property with impact on overall soil quality.
47 ANALYZING SOILS OVER TIME
48 SOIL QUALITY Soil quality encompasses physical, chemical, and biological soil properties.
49 SOIL QUALITY SQ was highest at Christian Science Center and lowest at BBN, why? SQ tends to increase with organic matter and time. SQ tends to be higher in planting compared to hardscape.
50 SOIL DEVELOPMENT - ACIDIFICATION Acidification is a key weathering process. Soil ph is decreasing and profiles are becoming more complex with time.
51 SOIL AND TREE RELATIONSHIPS Tree condition appeared to be most related to soil physical properties. Tree condition increased with increased fine material and soil moisture, and decreased with higher bulk density and coarse material. fine/coarse material bulk density moisture
52 SOIL & TREE RELATIONSHIPS Tree growth rates appear correlated to soil chemistry. Tree growth increased as soil ph and Electrical Conductivity decreased. electrical conductivity ph
53 DRAWING CONCLUSIONS + DISCUSSION
54 PROLOGUE Manufactured soils may not be the ideal horticultural solution, but they balance competing goals growing trees in an urban environment and providing a continuous, stable, and durable paving system.
55 PROLOGUE Soils systems are dynamic and therefore require a long term-commitment from design through construction oversight to on-going monitoring and maintenance.
56 DISCUSSION TOPICS 1. Organic Matter 2. Soil Dynamics (short-term) 3. Soil Dynamics (long-term) 4. Management and Maintenance 5. Future Research Areas
57 1 ORGANIC MATTER ASSUMPTION Without organic inputs, SOM decreases over time. Without access to the soil or natural leaf accumulation, organic material will become less available under pavements.
58 1 ORGANIC MATTER FINDINGS Organic matter does not appear to decrease over time if trees are healthy and have fine root turnover. Returning leaf litter to the soil can increase organic matter. CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P 15 YRS 8 YRS CWP - H SBMP - H CWP - P RKG - P SBMP - P 7 YRS 11 YRS 7 YRS 6 YRS 11 YRS CSC - H POS - P 45 YRS 24 YRS HARDSCAPE PLANTING
59 1 ORGANIC MATTER LESSONS Soil organic matter is critical for healthy trees. The best way to get organic matter into soils under pavement is through fine root regeneration, which comes from healthy trees.
60 2 SOIL DYNAMICS (SHORT TERM) ASSUMPTION Soils under pavement are relatively static as they are not influenced directly by outside elements. AKA set it and forget it.
61 2 SOIL DYNAMICS (SHORT TERM) FINDINGS Sand-Based soils appear to be more susceptible to changing environmental conditions including moisture, ph, salinity, and respiration. CU Soil SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
62 2 SOIL DYNAMICS (SHORT TERM) LESSONS Soils, even under pavement, are dynamic and respond to environmental conditions. In intensively drained soils under pavement, moisture monitoring and irrigation are likely important to provide horticultural stability. Permeable pavement systems may allow snowmelt salts to enter soils which can accummulate at lower levels.
63 3 SOIL DYNAMICS (LONG TERM) ASSUMPTIONS It is a closed system. Soils under pavement are relatively static over time.
64 3 SOIL DYNAMICS (LONG TERM) FINDINGS Increased bulk density at greater depths suggest dynamic flows within the soils section over time.
65 3 SOIL DYNAMICS (LONG TERM) FINDINGS Soil Systems are not static. They are constantly being influenced by what is in the soils and by outside physical and environmental factors.
66 3 SOIL DYNAMICS (LONG TERM) LESSONS Blended soils tend toward specific ph ranges, so initial selection of tree species which are tolerant of the soil ph is critical. (CU tends to be Alkaline and Sand Based varies but tends to be more acidic.) CU SOIL SAND-BASED HORT SOIL BBN - P HAL - P CWP - H SBMP - H CWP - P RKG - P SBMP - P CSC - H POS - P HARDSCAPE PLANTING
67 3 SOIL DYNAMICS (LONG TERM) LESSONS Soils need periodic assessment and management. We should design systems that enable post installation access to soils under pavement.
68 4 MANAGEMENT AND MAINTENANCE ASSUMPTIONS Initial soil specifications are the most important factor in the future health of plantings and the overall performance of the landscape.
69 4 MANAGEMENT AND MAINTENANCE FINDINGS The difference between designed and tested conditions varied enough to make us suspect installation practice.
70 4 MANAGEMENT AND MAINTENANCE FINDINGS We need to maintain our landscapes. No matter what the soils system, there appears to be a relationship between maintenance and tree performance. physical, chemical and biological properties
71 4 MANAGEMENT AND MAINTENANCE LESSONS An integrated plan for landscape commissioning and a long-term management and maintenance plan support the long-term viability of urban soils.
72 5 FUTURE RESEARCH This is just a start. We need more data. We need to work together to get it. Build access ports and add landscape commissioning and long-term data collection into your next project.
73 CONTINUING EDUCATION The American Society of Landscape Architects is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non- AIA members are available on request.this program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
74 COPYRIGHT This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. The American Society of Landscape Architects
75 ROUNDTABLE DISCUSSION Kelby Fite, PhD Bartlett Research Labs Eric Kramer, ASLA Reed Hilderbrand Bryant Scharenbroch, PhD Morton Arboretum Robert Uhlig, ASLA Halvorson Design Partnership
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