چکیده:
Desertification is more related to social and anthropogenic issues than natural causes and it becomes more
important over the time. Human effects on desertification could be classified as direct and indirect factors. This study
has focused on the effect of management factor, as a dominant case, on desertification of Kashan region based on
IMDPA (IMDPA: Iranian Model of Desertification for Potential Assessment) model. The geometric average weight
was used in order to find out the numerical value of management factor and then; desertification status map of the
area was prepared using GIS. The results showed that about 59.96 percent of the region, based on management
criterion, is classified in the medium class of desertification which mostly covers central, northern, southeastern and
western parts of the region. Meanwhile, irrigation systems, rangeland ploughing and the index of evaluation
implemented activity having the numeral value of 3.52, 3.43 and 2.23 are the most important affecting factors on
desertification, respectively. Increasing unwise human activities due to lack of sufficient knowledge on new irrigation
and cultivation technologies has been resulted on accelerated degradation and consequent desertification. Then,
combination of new extension and traditional knowledge, policy making and planning may lead to desertification
control in the region.
خلاصه ماشینی:
Methodology In this research and based on IMDPA methodology, rangelands and shrub lands were considered for policy making while agricultural lands were chosen to examine the effectiveness of management criterion (Tables 1 and 2).
(Layer – 2)…(Layer- n)]1/n Where Index-X: criteria Layer: indices of each criterion N: number of indices of each criterion According to the mentioned formulas, the following indices were calculated: ● Range land and shrub land index = (over grazing × shrubs cutting × range ploughing × yield reduction) ● Agriculture index: (Land use change × wise farming × unwise application of machinery and pesticides × irrigation × change of well to qanat) ● Policy and management = (Required actions × combating desertification methods × implemented activities × people participation) ● Management quality = (type and intensity of land use × policy and management) 3.
Average values of policy making and implemented management criteria in the region Row Assessment index Average value Class of desertification 1 Required action 1.
51 Medium </CV<%50 %10<CV<%25 CV<%10 Shrubs cuttingBare lands and plough ranges (> According to the prepared maps of indices, final map of desertification intensity based on management criteria was prepared for the region (Figure 3).