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(a) GBQ chart 
   
   
GOR (%) 
   
  
  
   
  
          
       
   
    
  
gy EE) 
  
     
(b) GOR chart 
Fig. 5 Greening overlay rate (GOR) and green biological quantity (GBQ) 
chart of a small experimental zone in the southwest of Shanghai 
On the aerial photo, we provid a lcmxlem 
grid which is in conformity with that on 
the map.After interpretation of the aerial 
photo, four codes are programmed in each 
unit, namely the number of plants, average 
crown-diameter, tree variety code and lawn 
area and these codes are directly marked 
on the related grid to make up the so-cal- 
led "GBQ information coding chart". 
Fig.5 is a comparison between the gree- 
ning overlay rate and GBQ of a small 
experimental zone It shows that although 
the GBQ and greening overlay rate are clo- 
sely related, the dimension-grade of the 
GBQ is greatly variable in the lawns, 
bushes and woods, where the greening over- 
lay rate are identical. This variation 
must be relative with the difference in 
environment effects between these types 
of green land. That is to say, the  analy- 
Sis of the greening ecological environment 
effect and the estimation of the economic 
output by GBQ information have better 
relativeness and higher accuracy than by 
£reening overlay rate. 
Chart 4 shows the working procedure of 
the establishment of GBQ information 
library.This library has the major output 
functions of carrying out statistics of 
GBQ by region and by class and charting 
GBQ map. If statistics are done only for 
the GBQ of evergreen plants, the winter 
GBQ of the city may be given so as to 
compare the environmental difference of 
the city between winter and summer.If the 
experimental valuen of the greening micro 
enviromental effect of certain area is 
inputted, analysis of the greening envi- 
ronmental ecology effect of the regions 
or the whole city and quantitive estima- 
tion of the greening economic output of 
the whole city may be carried out. 
III. Establishment of Management Information 
Library of Special 
Both the above mentioned 2-D GOR data 
library and 3-D GBQ information library 
belong to macro library with medium scale 
(unit size: 50mx50m). They are mainly used 
in the macro planning management of urban 
greening and analysis of greening ecologi- 
cal environment of large areas. However, 
this kind of information library appears 
to be too rough for some of the Special 
greening areas where the plant varieties 
are rather complicated such as parks, some 
of the street gardens and major scenic 
spots.In view of this,we carry out experi- 
ment for the establishment of the manage- 
ment information library with large scale 
of such special  greening area. Compared 
with the above mentioned two libraries, 
this type of management library with large 
scale lays more emphasis on the micro 
garden view planning and horticultural 
technology management, for excample it 
stores such information related with the 
garden landscape and horticultural techno- 
logy,as name of a certain plant, coordinate 
of tree stock, standing conditions, time 
of planting (tree age ), crown diameter, 
743 
Greening Areas 
crown shape,stock diameter,blossom period, 
fruitbearing period etc.. One may inquire 
and take out the related greening informa- 
tion of the greening areas managed by 
means of dialogue on the computer screen 
and may see the landscape effect of plant 
group from different angles to take 
Screen-type garden landscape designing and 
planning and may see the entire planning 
effect of the district greening. 
l. Preparation of plant distribution map 
and collection of plant information 
The experiment of the establishment of 
large scale management information library 
of special greening areas is started from 
Shanghai Botanical Garden and Great View 
Garden. The library of Shanghai Botanical 
Garden emphasizes horticultural technology 
management. The information includes types 
of plant, standing conditions, time of 
planting and growth situation and so on. 
The library of Great View Garden  emphasi- 
zes garden landscape planning. The infor- 
mation stored and output functions include 
layout and structure of whole garden,