基于地理探测器的山区作物生产潜力指数修正研究

Correction of Crop Production Potential Index in Mountainous Area Based on Geodetector

运用地理探测器的方法,以青海省海东市平安区及其周边共70个县级行政单位为研究对象,探测地形、气象因素不同分层方式对生产潜力指数的解释力,并对指定作物生产潜力指数进行修正。结果表明:研究区内,显著影响作物生产潜力指数的因素为海拔和年均降雨量;研究区内海拔对作物光温生产潜力指数解释力最高的分层方式为以1100m为基数、200m为间隔,年均降雨量对作物光温生产潜力指数解释力最高的分层方式为以0mm为基数、100mm为间隔;海拔对作物气候生产潜力指数解释力最高的分层方式为以1100m为基数、200m为间隔,年均降雨量对作物气候生产潜力指数解释力最高的分层方式为以25mm为基数、50mm为间隔。平安区验证分层结果表明,作物光温生产潜力指数与耕地质量等级年度更新调查评价工作中使用的光温生产潜力指数与修正前相比有不同程度降低;气候生产潜力指数与耕地质量等级年度更新调查评价工作中使用的气候生产潜力指数与修正前相比有不同程度升高;按照本文方法对作物生产潜力指数进行修正后,水浇地的自然等别整体下降,旱地的自然等别整体上升。

The cultivated land quality grading results are an important reference for the implementation of the trinity protection of cultivated land quantity,quality and ecology.Crop production potential index is one of the most important parameters in the evaluation of cultivated land quality,and its accuracy determines the scientific nature of the survey results of cultivated land quality grades in China.By using the method of geodetector,a total of 70 counties,including Ping an county and its surrounding counties were used as research objects to detect the interpretation of production potential index by different stratification methods of topography and meteorological factors,and revise the production potential index of appointment crop.The key results were as follows:in the study area,the factors that significantly affected the crop production potential index were altitude and annual average rainfall;the stratification method of altitude with the highest explanatory power for crop light temperature production potential index was based on 1 100 m,and 200 m as interval;the stratification method of annual average rainfall with the highest explanatory power for crop light temperature production potential index was based on 0 mm,and 100 mm as interval;for the climate production potential index,the stratification method of altitude with the highest explanatory power was based on 1 100 m,and 200 m as interval,and the stratification method of annual average rainfall was based on 25 mm,and 50 mm as interval.According to the correction result of Ping an county,the crop light temperature production potential index was reduced to a different extent compared with the light temperature production potential index used in cultivated land quality grade survey and evaluation;while the climate production potential index was generally rose.Using the model proposed,natural grade of non-irrigated cultivated land was rose overall,but natural grade of irrigated cultivated land was reduced in different extents.