Application of Paclobutrazol to Mitigate Environmental Stress of Urban Street Trees
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Sites
2.2. Measurements
2.2.1. SPAD Chlorophyll Index
2.2.2. Photosynthetic Gas Exchange
2.2.3. Leaf Water Potential
2.2.4. Leaf Morphology and Shoot Growth
2.2.5. Analysis
3. Results
3.1. SPAD Chlorophyll Index
3.2. Photosynthetic Gas Exchange
3.3. Leaf Water Potential
3.4. Leaf Morphology and Shoot Growth
4. Discussion
5. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Downtown | Old Town | |||||
---|---|---|---|---|---|---|
Species | n | Dbh (cm) | Height (m) | n | Dbh (cm) | Height (m) |
Honeylocust | 10 | 26.5 ± 3.3 | 7.84 ± 0.19 | 14 | 37.9 ± 1.5 | 13.01 ± 0.38 |
Callery pear | 48 | 12.3 ± 0.5 | 5.70 ± 0.18 | 14 | 22.7 ± 1.8 | 9.04 ± 0.57 |
Location | Date | Maximum Daily Temperature (°C) | Total Solar Radiation (MJ) | Rainfall 7 days Prior (mm) |
---|---|---|---|---|
Downtown | 9 July 2014 | 22.9 | 19.7 | 36.8 |
6 Aug 2014 | 25.9 | 20.1 | 30.0 | |
9 Sept 2014 | 25.3 | 16.2 | 15.2 | |
28 May 2015 | 26.6 | 25.6 | 13.5 | |
24 June 2015 | 25.7 | 25.3 | 55.6 | |
6 July 2015 | 28.1 | 22.4 | 5.8 | |
6 Aug 2015 | 24.9 | 19.2 | 18.5 | |
1 Sept 2015 | 30.4 | 17.4 | 3.6 | |
Old Town | 10 Jul 2014 | 24.5 | 22.5 | 36.8 |
8 Aug 2014 | 25.1 | 19.2 | 29.0 | |
29 Sept 2014 | 25.0 | 15.0 | 0.0 | |
9 June 2015 | 24.7 | 22.4 | 9.4 | |
8 July 2015 | 18.8 | 14.2 | 24.9 | |
12 Aug 2015 | 25.3 | 22.0 | 60.2 | |
10 Sept 2015 | 24.2 | 16.9 | 68.3 |
Net Photosynthesis (μmol m−2 s−1) | Stomatal Conductance (mmol m−2 s−1) | |||
---|---|---|---|---|
Date | PBZ | Control | PBZ | Control |
9 Jul 2014 | 17.4a (0.6) | 14.9b (0.7) | 279.5a (11.1) | 217.3b (16.2) |
6 Aug 2014 | 12.8a (0.8) | 11.5a (0.6) | 235.6a (24.2) | 215.7a (17.8) |
6 Aug 2015 | 7.1a (0.6) | 7.1a (0.4) | 124.2a (13.4) | 127.4a (11.5) |
1 Sept 2015 | 9.4a (0.7) | 8.4a (0.5) | 213.1a (18.9) | 185.7a (13.7) |
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Cregg, B.; Ellison-Smith, D. Application of Paclobutrazol to Mitigate Environmental Stress of Urban Street Trees. Forests 2020, 11, 355. https://doi.org/10.3390/f11030355
Cregg B, Ellison-Smith D. Application of Paclobutrazol to Mitigate Environmental Stress of Urban Street Trees. Forests. 2020; 11(3):355. https://doi.org/10.3390/f11030355
Chicago/Turabian StyleCregg, Bert, and Dana Ellison-Smith. 2020. "Application of Paclobutrazol to Mitigate Environmental Stress of Urban Street Trees" Forests 11, no. 3: 355. https://doi.org/10.3390/f11030355