On Suitability Evaluation in Potential Areas of Dryland-to-Paddy Conversion:A Case Study of Hanyuan County,Ya'an City
Dryland-to-paddy conversion project can effectively promote the balance of cultivated occupation and compensation,improve the quality of cultivated land,and ensure regional food security.This paper aimed to identify the potential scale of dry-to-paddy conversion of towns in the study areas and analyze the restrictive factors through a comprehensive evaluation of the suitability in potential arears of dryland-to-paddy conversio.Research method:taking Hanyuan County,Ya'an City as an example,this paper constructed a suitability evaluation model of dryland-to-paddy conversion by selecting seven evaluation indexes based on survey data of the annual land use and change of Hanyuan County in 2022,including terrain slope,distance to water source,plot size,soil layer thickness,soil pH,soil organic matter content and surface soil texture.The model was employed to evaluate the suitability of the potential areas of regional dryland-to-paddy conversion,classify the potential areas into different grades,and analyze the obstacle factors of regional dryland-to-paddy conversion.The results indicated that:(1)the scales of highly and moderately suitable areas for dryland-to-paddy conversion was relatively small,mainly distributed in the southeast and north of Hanyuan county;(2)the potential of dryland-to-paddy conversion varied greatly among villages and towns,with only Dashu Town,Yidong Town,Huangmu Town and Nimei Yi Ethnic Town being in the first grade;(3)based on the analysis of the limitations posed by evaluation factors beyond the specified range,it was identified that terrain slope,plot size and soil layer thickness were the obstacle factors to the suitability of dryland-to-paddy conversion in the study areas.Research conclusion:Hanyuan county can implement the dryland-to-paddy conversion project through slope-to-staircase conversion of cultivated land,more application of organic fertilizers to improve soil quality and comprehensive utilization of subdivided land plots.
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