WWW.THESIS.DISLIB.INFO
FREE ELECTRONIC LIBRARY - Online materials, documents
 
<< HOME
CONTACTS



Pages:     | 1 |   ...   | 15 | 16 ||

«Proceedings of the th 14 National Street Tree Symposium 2013 ISBN: 978-0-9806814-1-3 TREENET Proceedings of the 14th National Street Tree Symposium ...»

-- [ Page 17 ] --

 When bark is removed from a tree accidently or by vandalism, the bark should be replaced in position immediately as natural grafting and callus growth can take place so that growing over occurs very quickly. This process can be described as bark patch grafting. The key to success is speed, as the bark that has been detached cannot be allowed to dry out nor can the damaged edges of the bark remaining on the tree dry. The work of Chandler (2009) showed that keeping eucalypt woody tissues moist facilitated successful callus growth and grafting success in Eucalyptus leucoxylon. Care must also be taken to replace the bark at the right orientation so that, for example, the part facing upward remains in that orientation and that there is as much contact as possible between the replaced patches of bark and the bark on the tree (McGarry, 2001). The bark can be held in place by any biodegradable material, but any fastening will suffice given the size and seriousness of the wound. Success may also be affected for some species by season, with better rates of patch grafts occurring in spring and autumn for eucalypts than in winter or mid-summer (McGarry, 2001).

 Bridge grafting is a well-known horticultural technique that has a long history of use in repairing damaged orchard trees (Hartmann and Kester, 1975; Harris et al., 2004) but it has also been used to repair damaged ornamental trees of historic, heritage, cultural, landscape and horticulture significance which warrant the expenditure. The technique uses bark tissue from the same specimen, a clone, or the same species, which is inserted into the remaining healthy bark of a ringbarked or girdled tree. The objective of bridge grafting, as the name suggests, is to provide channels of connection of both xylem and phloem tissue that allow transport basipetally and acropetally once more (Figure 4). Success relies on healthy cambium producing callus at both ends of the grafted bark and the rate of success can be influences by species and seasonal factors. Bridge grafting requires skill and is quite expensive to undertake and so it is usually only contemplated for outstanding and significant trees. On a large tree, a number of grafts, up to 10 or more may be inserted, and the aesthetics of the outcome are sometimes questioned by arborists and the general public.

–  –  –

Figure 4. Bridge grafting of a ring-barked trunk (modified from Hartmann and Kester, 1975)  Approach grafting and inarching are other well-known horticultural techniques used in repairing damaged orchard and valuable ornamental trees (Hartmann and Kester, 1975; Harris et al.

, 2004).

They differ in that for inarching, the top of the new rootstock plant does not extend above the point of the graft union. Inarching is considered to be a form of ‘repair grafting’. Both techniques involve growing young seedlings that are progeny of the damaged plant, clones or at least of the same species as the damaged plant around the base of the damaged tree. The young trees should be of a reasonable size (1-2m in height with a stem diameter of 20-25mm if possible) and the trunk or one of the larger branches is then inserted into the healthy cambium of the damaged tree above the upper cut of the ring-barked or girdled region. The objective of approach grafting is to provide water and nutrients to the part of the damage tree above the zone of ring-barking or girdling, but it does not provide for transport downwards to the original root system. However, if successful and given enough time the young tree root systems develop as the original system declines and in some cases natural root grafting between tree and seedling may occur (Tarroux and DesRochers, 2011). This technique is relevant when water is likely to be a limiting factor in the survival of a damaged tree and there is a significant risk of imminent wilting. Once more, approach grafting requires skill and is quite expensive to undertake. On a large tree a number of grafts, up to 6-8, or more grafts may be inserted, and the aesthetics of the outcome are sometimes questioned as there are a number of smaller trees growing around the trunk of the specimen.

 Another aspect of post-damage management that an arborist can undertake is to minimize the risks from environmental stresses. For the most part this will involve making sure that water and nutrients are not limiting and that there is no risk of waterlogging to the already stressed root system. Good subsurface irrigation and drainage and proper mulching around the drip line would be useful practices. Post-damage control of pests and diseases is also wise (Priestley, 2004). Even partial ring-barking and girdling of trunks or larger branches exposes plants to significant stress which may leave them vulnerable to pest and disease attack. For example, the attack on E camauldensis by the psyllid, white lace lerp (Cardiaspina albitextura) was confined to trees that had been ring-barked or girdled and not to undamaged control trees that were largely unaffected (Priestley, 2004). Psyllids are attracted to high nutrient levels in foliage and population numbers increase rapidly in these conditions (Collett, 2001) which is consistent with ring-barking and girdling causing an increase in sugar and carbohydrate accumulation above the zone of damage (Kramer & Kozlowski, 1960). It is possible that these conditions might also suit some fungal pathogens.





 Injections of sucrose into the soil have been reported to significantly improve fine root growth of established trees with responses dependent on species and the sugar concentrations applied (Percival et al, 2004). It is unclear whether the response is due to the direct uptake of the sugar by The 14th National Street Tree Symposium 2013 the roots or to enhanced mycorrhizal growth, which would also benefit the tree. The timing of such applications is also critical. It should not be too early after damage as the roots, under normal circumstances, should have sufficient carbohydrate reserves, but could be applied when carbohydrate resources are in danger of depletion. Measurement of carbohydrate concentration in root tissue could inform the timing of application. Care must also be undertaken to ensure that the injected sugar does not benefit non-target organisms.

Conclusion Depending on the tree and the conditions that it is growing under, ring-barking may not mean the death of a tree, but little can be done if a tree is effectively girdled severing the active xylem tissue. Arboricultural treatments that respond rapidly (within hours) to the removal of bark and which provide ideal growing conditions for the tree enhance the chances of recovery from ring-barking. Treatments may involve irrigation, mulching, prevention of compaction and waterlogging and effective pest and disease control.

Depending on the species, environmental conditions and the time of year, re-affixing displaced bark (bark or patch grafting) can be successful if it is done within hours of removal and the tissues, both intact and displaced, have not dried out. If successful, callus production can be very rapid and growing over can occur within months. If the tissues dry or cannot be replaced other interventions such as bridge or approach grafting may be contemplated, but they can affect the aesthetic value of the specimen.

It should also be understood that healthy vigorous trees that appear to have been fully ring-barked or girdled, on closer and detailed inspection may prove to have only been partially girdled or ring-barked. Such trees may survive with as little as 10-20% vascular connection or less if they are young and healthy. Under these circumstances, the “do nothing to the tree” option may be an appropriate response provided that good arboricultural management practices are implemented subsequent to the injury.

Acknowledgements The work of Sarah Priestly for her Industry Project Report at the Burnley Campus, University of Melbourne, is acknowledged. I also acknowledge the contribution of my students in the 2013 Graduate Certificate in Arboriculture, Urban Tree Growth and Function, particularly Sian Bloom, whose questions and essays on a related topic assisted in the writing of this paper. Ms E Moore, linguist, is thanked for her reading of and helpful suggestions for improving the manuscript. I also thank Dr Sue Hughes for her excellent and thought provoking reading of the manuscript which enhanced the work.

References Atwell B, Kriedemann P and Turnbull C (1999) Plants in Action, Macmillan, South Yarra.

Chandler A L (2009) The identification and improved propagation of the Australian native, Eucalyptus leucoxylon, for urban use, Doctoral Thesis, Burnley College, University of Melbourne.

Collett N (2001) Psyllid Biology and Eucalypt Defoliation, Forestry Note AG0817, Department of Environment and Primary Industries, Victoria.

Esau K (1965) Plant Anatomy, 2nd Ed, Wiley, New York.

Fagg P (2012) The 'Separation Tree': Past, present and possible future. The Vic Nat, 129, 147-151.

Fahn A (1974) Plant Anatomy, 2nd Ed, Pergamon Press.

Glass W (2011) Vegetation Management Guideline. White poplar (Populus alba L) Illinois Natural History Survey, Prairie Research Institute, University of Illinois.

Goren R, Huberman M and Goldschmidt E E (2004) Girdling: Physiological and Horticultural Aspects, Horticultural Reviews, 30, 1-36.

Harris R W, Clark J R and Matheny N P (2004) Arboriculture: Integrated management of landscape trees, shrubs and vines. 4th Ed. Upper Saddle River, New Jersey: Prentice Hall.

–  –  –

Hartmann H T, Flocker W T and Kofranek A M (1981) Plant Science, Prentice Hall, Engelwood Cliffs, New Jersey Holmes F W (1984) Effects on Maples of Prolonged Exposure by Artificial Girdling Roots. J Arb, 10(2), 40-44.

Kilroy B and Windell K (1999) Tree Girdling Tools. In: Small Area Forestry Equipment. Missoula: United States Dept.of Agriculture - Forestry Service, p. Part 1 of 3.

Kramer P J and Kozlowski T T (1960) The Physiology of Trees, McGraw Hill, USA.

McGarry P J (2001) Bark Grafting as a Method of Wound Treatment in Urban Trees, Master of Applied Science (Horticulture) Thesis, Burnley College, University of Melbourne.

McLuckie J and McKee H S (1954) Australian and New Zealand Botany, Horwitz Publications, Sydney.

Moore G M (2011) Culturally Significant Trees: Treenet Case Study Lawry D, B. Merrett Editors, Proceedings of the Twelfth National Street Tree Symposium, 117-119, University of Adelaide/Waite Arboretum, Adelaide, ISBN 978-0-9805572-5-1.

Neely D (1988). Tree wound closure rates on trees, J Arb, 14(10), 250-54.

Percival G C, Fraser G A and Barnes S (2004) Soil injections of carbohydrates improve fine root growth of established urban trees. Arboricultural Journal, 28, 95-103.

Priestley S (2004) The effects of Girdling and Ringbarking on Young Trees: a Preliminary Study, Industry Project Report, University of Melbourne, Burnley Campus.

Raven, P. H., Evert, R. F. & Eichhorn, S. E., 2005. Biology of Plants. 7th Ed. W.H.Freeman and Company, New York.

Salisbury F B and Ross C (1992) Plant Physiology, 4th Ed Wadsworth Publishing, Belmont, USA.

Stubbs B J (1998) Land Improvement or Institutional Destruction? The Ringbarking controversy 1879-1884 and the Emergence of a Conservative Ethic for New South Wales. Environment and History, 4, 145-65.

Taiz L and Zeiger E (2002) Plant Physiology, 3rd Ed, Sinauer and Associates, Sunderland.

Tarroux E and DesRochers A (2011) Effect of natural root grafting on growth response of jack pine (Pinus banksiana; Pinaceae). Am J Bot, 98 (6), 967-974.

Weier T E, Barbour MG, Stocking C R and Rost T L (1982) Botany, 4th Ed, Wiley, New York.

Pages:     | 1 |   ...   | 15 | 16 ||


Similar works:

«INSTITUTE Codebook Version 6 Mar 2016 Copyright © University of Gothenburg, V-Dem Institute, University of Notre Dame, Kellogg Institute. All rights reserved. Principal Investigators Project Managers  Michael Coppedge – U. of Notre Dame  David Altman – Pontificia U. Católica de Chile  John Gerring – Boston University  Michael Bernhard – University of Florida  Staffan I. Lindberg – U. of Gothenburg  M. Steven Fish – UC Berkeley  Svend-Erik Skaaning – Aarhus...»

«Finance Item x: NSW State Budget 2011-12 NSW Budget Papers 2011-12 The budget 2011/12 continues on www.budget.nsw.gov.au the path of major infrastructure Contact spending. Existing programs Sascha Moege affecting Local Government have 02 9242 4045 sascha.moege@lgsa.org.au largely been maintained. or The following information focuses on budget Shaun.McBride measures affecting Local Government. Local Government Focus Overview shaun.mcbride@lgsa.org.au Funding for programs directly affecting Local...»

«Manteca, California December 11, 2012 The Board of Directors of the South San Joaquin Irrigation District met in regular session in their chambers at the hour of 9:00 a.m. President Holbrook called the meeting to order and Director Roos led the flag salute. Upon roll call the following members were noted present: DIRECTORS: HOLBROOK HOLMES KAMPER KUIL ROOS ABSENT: NONE Also present were General Manager Shields, General Counsel Emrick, Engineering Department Manager Sam Bologna, and Betty...»

«THE BEACON 50p June November 2006 The Parish Magazine of All Saints’ Sedgley & St Andrew’s The Straits “Learn from yesterday, live for today, hope for tomorrow” Albert Einstein For over 100 years you have been helping local people with sight loss This year you helped Anne-Marie to ride a bike on her own for the first time, you helped Frank leave his house each week to meet his friends for a cup of tea and a chat and you helped William receive the care and support he needs every day....»

«TREDEGAR & DISTRICT CANINE SOCIETY Chairman: Mr. Clive Evans Vice Chairman: Mr. Trevor Jones Treasurer: Mrs. Lilian Evans Committee: Mrs. Cynthia. Crossley, Mr. Jon Crossley, Mrs. Linda David, Mrs. Jane Humphries, Mrs. Janet Saunders SCHEDULE OF UNBENCHED 73 CLASS MEMBERS LIMITED SHOW (Held under Kennel Club Rules & Show Regulation) Not judged on the Group System At TREDEGAR LEISURE CENTRE, STABLE LANE TREDEGAR, GWENT, NP22 4BH On SATURDAY 2nd APRIL 2016 Show Opens 9.30 a.m. Judging in both...»

«1666 K Street, N.W. Washington, DC 20006 Telephone: (202) 207-9100 Facsimile: (202) 862-8433 www.pcaobus.org Inspection of Pritchett, Siler & Hardy, P.C. (Headquartered in Salt Lake City, Utah) Issued by the Public Company Accounting Oversight Board July 29, 2010 THIS IS A PUBLIC VERSION OF A PCAOB INSPECTION REPORT PORTIONS OF THE COMPLETE REPORT ARE OMITTED FROM THIS DOCUMENT IN ORDER TO COMPLY WITH SECTIONS 104(g)(2) AND 105(b)(5)(A) OF THE SARBANES-OXLEY ACT OF 2002 PCAOB RELEASE NO....»

«CHAIRPERSON HUMAN SERVICES COMMITTEE MARK GREBNER JOHN CZARNECKI, CHAIR LISA DEDDEN CHAIRPERSON PRO TEM MICHAEL SEVERINO CHRIS SWOPE CURTIS HERTEL JR. VICTOR CELENTINO VICE-CHAIRPERSON PRO-TEM MIKE SEVERINO INGHAM COUNTY BOARD OF COMMISSIONERS P.O. Box 319. Mason, Michigan 48854 Telephone (517) 676-7200 Fax (517) 676-7264 THE HUMAN SERVICES COMMITTEE WILL MEET ON MONDAY, MAY 14, 2001, AT 7:00 P.M., IN CONFERENCE ROOM B OF THE HUMAN SERVICES BUILDING, 5303 S. CEDAR, LANSING. Agenda Call to...»

«Flow improvement caused by agents who ignore traffic rules Seung Ki Baek 1, Petter Minnhagen 1, Sebastian Bernhardsson 1, Kweon Choi2, Beom Jun Kim 3 ˚ ˚ 1. Department of Physics, Umea University, Umea, Sweden 2. Gyeonggi Science High School, Suwon, Korea 3. Department of Physics, Sungkyunkwan University, Suwon, Korea A system of agents moving along a road in both directions is studied within a cellular-automata formulation. An agent steps to the right with probability q or to the left...»

«12-01563 Doc 3 Filed 04/19/12 Entered 04/19/12 11:21:03 Main Document Pg 1 of 59 Baker & Hostetler LLP 45 Rockefeller Plaza New York, NY 10111 Telephone: (212) 589-4200 Facsimile: (212) 589-4201 Attorneys for Irving H. Picard, Trustee for the Substantively Consolidated SIPA Liquidation of Bernard L. Madoff Investment Securities LLC and Estate of Bernard L. Madoff UNITED STATES BANKRUPTCY COURT SOUTHERN DISTRICT OF NEW YORK SECURITIES INVESTOR PROTECTION CORPORATION, Plaintiff, Adv. Pro. No....»

«33 Joalah Financial Sharing (JFS) Joalah Financial Sharing (JFS) Bijan Bidabad1 Abstract JoalahFinancial Sharing (JFS) paves the way for financing the working capital of productive firms. JFS is a financial subsystem of Rastin Profit and Loss Sharing (PLS) banking system and in this regard, its instructions, organization, working procedures, electronic structure, contracts and forms worksunder Rastin PLS banking Base System rules and regulations. In JFS,bank by obtaining commission works as...»

«PAGE 5 1936 Marquette Golden Avalanche By Ed Pavlick Although they didn't go undefeated, the 1936 Golden Avalanche, coached by Frank Murray, was considered by many to be Marquette's greatest team. Playing a tough schedule against major teams from the West, South, and East as well as the Midwest, they gained the most prestige and fame of any Marquette team playing two games in Chicago's Soldier Field and in the very fIrst Cotton Bowl game. It featured one of the most dynamic backfields of the...»

«Invasive Plants in Mediterranean Type Regions of the World Plantes envahissantes dans les régions méditerranéennes du monde Proceedings of the International Workshop Actes de l’atelier de travail international Mèze, France, 25-27 May 2005 Mèze, France, 25-27 mai 2005 Edited by Sarah Brunel Invasive Plants in Mediterranean Type Regions of the World Plantes envahissantes dans les régions méditerranéennes du monde Proceedings of the International Workshop Actes de l’atelier de travail...»





 
<<  HOME   |    CONTACTS
2017 www.thesis.dislib.info - Online materials, documents

Materials of this site are available for review, all rights belong to their respective owners.
If you do not agree with the fact that your material is placed on this site, please, email us, we will within 1-2 business days delete him.