22 research outputs found
Effects of two contrasting canopy manipulations on growth and water use of London plane (Platanus x acerifolia) trees
Aims: Two contrasting canopy manipulations were compared to unpruned controls on London plane trees, to determine the effects on canopy regrowth, soil and leaf water relations.
Methods: ‘Canopy reduction’, was achieved by removing the outer 30 % length of all major branches and ‘canopy thinning’, by removing 30 % of lateral branches arising from major branches.
Results: Total canopy leaf areas recovered within two and three years of pruning for the canopy-thinned and reduced trees respectively. Canopy reduction increased mean leaf size, nitrogen concentration, canopy leaf area density and conserved soil moisture for up to 3 years, whereas canopy thinning had no effects. Another experiment compared more severe canopy reduction to unpruned trees. This produced a similar growth response to the previous experiment, but soil moisture was conserved nearer to the trunk. Analysis of 13C and 18O signals along with leaf water relations and soil moisture data suggested that lower boundary layer conductance within the canopy-reduced trees restricted tree water use, whereas for the canopy-thinned trees the opposite occurred.
Conclusions: Only canopy reduction conserved soil moisture and this was due to a combination of reduced total canopy leaf area and structural changes in canopy architecture
List of approved products and services The UK's most authoritative guide to the very best in fire and security protection products, services and installers
SIGLEAvailable from British Library Document Supply Centre- DSC:5224.75(1992) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Gaseous fire protection systems Guidance for the use of insurers, system suppliers and their mutual clients on the specification, installation and on-going maintenance of gaseous fixed fire extinguishing systems
SIGLEAvailable from British Library Document Supply Centre-DSC:7660.344(16) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Subsidence and domestic housing survey Analysis of results
Available from British Library Document Supply Centre-DSC:7660.344(4) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Rules of the Fire Offices' Committee for automatic sprinkler installations
Originally publ. 1973, this edition contains 1988 amendments; incl. Technical bulletin- Loss Prevention Council no. 29-1, 1989 as a supplementSIGLEAvailable from British Library Document Supply Centre- DSC:8050.159V(29) / BLDSC - British Library Document Supply Centre29. edGBUnited Kingdo
List of approved products and services
SIGLEAvailable from British Library Document Supply Centre- DSC:5224.75(1989) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Noise at Work Regulations 1989 and their insurance implications
Also known as Circular SHE 3SIGLEGBUnited Kingdo
Report on the state of the art of compartment fire modelling
SIGLEAvailable from British Library Document Supply Centre- DSC:q94/21232 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Work stress Advice on its prevention and management
SIGLEAvailable from British Library Document Supply Centre-DSC:7672.124(15) / BLDSC - British Library Document Supply CentreGBUnited Kingdo