Revealing past and future land-cover transitions from 1985 to 2036 in
the drylands of Central Iran
Abstract
Land serves as a vital production resource, and therefore, land planning
plays an important role in sustainable land-use design. Increasing the
global population alters landscapes via land-use and land-cover change
across different landscapes, including the drylands. Iran includes large
areas of dryland, where the population increased by 60% from 1985 to
2016. Further population increase in Iran would require more land
resources to be allocated for human needs. However, the pace and
patterns of these changes remain unclear. The aim of this study was to
map land-cover change from 1985 to 2016 and predict future land-cover
change in the Zayandehrood ecologic sub-basins of Central Iran. By using
multiseasonal Landsat imagery, nine thematic classes were mapped with a
random forest classifier for 1985, 1998, and 2016 with an overall
accuracy of 80% for each period. Classification results revealed that
from 1985 to 2016 residential areas doubled and industrial areas
increased at the expense of rangelands. Our study also revealed cropland
expansion at the expense of rangelands, cropland abandonment and
contraction of croplands due to residential and industrial development.
Prediction of changes by 2036 with a multi-layer perceptron neural
network and Markov chain analysis revealed further expansion of
industries and residencies particularly nearby the protected areas such
as Ghamashlu Wildlife Refuge. Predicted contraction of some degraded
agricultural lands and concomitant agricultural expansion in the
agricultural frontier by 2036, underscore the importance of sustainable
land management in highly arid areas of Iran and improvement of the
strategies for the protection of rangelands.