546
Agricultural land
Wood land
Range land
Figure 1. The location of Song-nen plain
Figure 2. The land use of 3ong-nen Plain
5 THE RESULTS
The interpretation marks of landsat images MSS as
follow:
Agricultural land: most of agriculturalland were dis-
trabuted on the second terrace and gentle slop of
hills and for dry farming. It can identified by red
brown,red, brown,darkbrown and yellow in different
size square on the autumn false color composites. The
paddy fields were more dark and always with blue tone
near the rivers, lakes, and reservoirs on the same
image.The permenent vegetable fields showed in red,
magenta on the same image, and it was near cities and
towns.
Rangeland: in the center part of Song-nen plain were
covered by grass. The natural pasture land mostly
were distrabuted in the edges of saline-alkali land
or near villages. The interpretation marks were iden
tified by light brown , yellow brown and brown color
on the Oct. images of false color composites. The
grassland were showed dark brown, red brown on the
same image. Both natural pasture and grassland which
was fine and even in density.
Wood land: It occurs on the hilly areas of the Song-
nen plain that located in the east part and north
part of the plain. Tt can easily identified by their
bright red color on the false color composites image
which recorded in May and the shrubs were not as red
as forest.lt showed in pinkccolor on the same image.
Water areas: The main rivers in this region are the
Song Hua river and the Nen Jiang river and their tri
butaries. The total of number are nine. A hundreds of
lakes and reservoirs, larges and smalls, are studed
on this area. It can identified by dark blue, green
blue, blue and grey blue on the false color composi
tes images which, recorded in any season except winter
The reed land were identified by bright red color
nearby the water areas and marshland which recoded in
June and July.
Marsh land:always mixed with water and vagetation and
sludge that were showed by dark brown, black brown
on the false color composites which recorded in the
September or October.
Unutilization land: including bare rocks and waste
land that identified by white, yellow,green,brown and
red color mixed disorderly in the false color compo
sites which recorded in July and September, their
images were coarse in density. Both saline-alkali anc *
sand land showed in white, light yellow . _.i and light
grey color on false color composites in any season,
but saline-alkali land were distrabuted in the low
parts of the plain.and the sand land were not.
The urban or built-up areas: It can identified by the
light blue and grey blue color on the false color
composites images which recorded in October.
The areas of diffirent kind of land use:
Through one year work, the natural resources distra-
bution maps of Song-nen plain ( such as rangeland map
woodland map,water areas map etc. ) and present land
use map have been made. The agricultural land consti
tuted about 61.53 % of the study area and the dry
farming land constituted about 95.27 % ofthe agricul
tural land and the paddy fields were 4.54 % of the
agricultural land. The range land constitued about
16.08 % of the total area. But 48.90% of the range
land for natural pasture and the onathers for grass
land. There are about 2.0 % of the plain that covered
by water which can be used for fishing or other pur
pose. About 8.37 % of the study area covered by forest
st and shrubs only. The forests were about 62.50 %
of the woodland and the shrubs lands were about 37.5
% of the wood land.( Figure 2 ).
