Institute;
of;
Geographic;
Sciences;
and;
Natural;
Resources;
Research,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100101,;
China;
Institute;
of;
Geographic;
Sciences;
and;
Natural;
Resources;
Research,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100101,;
China;
land; use; change,; cultivated; land,; forestry; land,; driving; factors,; 20th; century.;