IX-B8, 2012
'ounties from the
0 periods from the
sidering the whole
in the first period,
ond period. On the
14.6 % in the first
cond period. The
y 45% and then
decreased all over
or each period. The
nuch in total. For
se for paddy land
2000. On the other
decreased in these
dryland increased
e time, grassland
slightly increased.
ddy fields show a
ied by a more than
of grassland.
010
rm area in the SJP
. Overall, the TSA
950, the TSA was
ever, until 2010 it
ird of the counties.
wed an increase. In
ore than 20 000 ha.
by more than 3.5
, the increase was
iobei, Suibin and
Although it is not
sification, the TSA
{, the TSA in each
han 150 000 ha in
rom 2004 to 2010,
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000 ha.
Others
980s to 1995
1995 to 2000
site -3.8
0.3 -3.1
3.5 -6.6
10.7 -1.4
78 -2.2
-0.6 -1.0
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-9.8 9.2
1.3 0.7
5.8 -0.5
1.8 -3.7
tive counties
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
+ Muling f
Legend
Nodata Wa» 70000-110000ha 4. Jiamusi
»20000-70000ha i^ 150000-365000ha 3:Qitaihe
Data Source:
NGCC, Beijing, China, 2010
s20000ha Wii» 110000-150000ha 2:Shuangyashan o 50 100 200 CBSED, Harbin, China, 2011
MN kr Map author: Q. Zhao, 2012
Figure 3. Total sown area of the non-farm area in the SJP for the last 60 years
4. DISCUSSION AND CONCLUSIONS
Land use change of paddy rice shown in Fig. 2 reveals similar
results compared with the study by Chen et al. (2012). Due to
climate warming in Heilongjiang starting in the 1980s, the sown
area of rice increased strongly (Guo, 2003; Yun, 2005).
However, a severe problem for rice growth in the region is cold
damage which happens frequently (Zhang et al. 1991). In
general, rice produces higher yields than e.g. soy bean but is
more temperature sensitive. Consequently, farmers changed the
crop type from year to year.
In Muling County, the most southern one of the SJP (Fig. 1),
farmers first cultivated a large area of paddy fields in the early
years of the 1980s because of the increasing temperature. After
several colder years, they changed some of the paddy land into
dryland, then again changed back to paddy fields (from
2 198 ha in the 1980s to 17 025 ha in 1995 and back to 2 198 ha
In 2000). From Tab. 2, it can be easily derived that the paddy
land was mainly converted from dryland and wetland, since the
other land use classes did not change significantly. The increase
of dryland is mainly due to conversion from grassland in the
period of the 1980s to 2000.
The change of the TSA during the last 60 year in Fig. 3 shows a
Special trend. The TSA increased very much in the first 15
years. After the establishment of the new China in 1949, people
focused on the agricultural production: New farming fields were
reclaimed in a short time. From 1965 to 1980, the TSA did not
increase very much. In the 1980s, the focus was on increasing
yield, not on reclaiming more agricultural land. From 1994 to
2004, the reclamation of arable land occurred under pressure of
increasing population and food demand. With the availability of
new technologies, it was possible to manage larger areas. The
TSA increased rapidly in the six years from 2004 to 2010.
The AEIS for the SJP will be used to investigate the long-term
change of the agro-ecosystems, to provide data sets for
ecosystem modeling and to derive sustainable management
strategies. It was possible to integrate first basic datasets in the
AEIS for the SJP. The main difficulty in establishing an AEIS is
the acquisition of available detailed soil data which is
demanded for spatially distributed agro-ecosystem modeling, of
detailed management data, as well as of detailed land use maps
which differentiate between the different crops within arable
land.
5. REFERENCES
Bareth, G., 2009. GIS- and RS-based spatial decision support:
structure of a spatial environmental information system (SEIS).
International Journal of Digital Earth, 2(2), pp. 134-154.
