Study On The Division Of Monitoring Of Cultivated Land Quality Gradient Type In Shunchang County,Fujian Province

It is an important measure to implement the national cultivated land quantity control,quality management and ecological management by carrying out the annual cultivated land quality monitoring.Defining the dominant gradient type in the county is the key to this work.Based on this,this paper focuses on the methods about the determination of the dominant gradient type of cultivated land quality and the division of the gradient type at county scale.This provides a practical plan for the implementation of monitoring work,and has important guiding significance for the rational deployment of monitoring samples and the dynamic monitoring of cultivated land quality.The key to the cultivated land quality monitoring is to determine the dominant gradient type in the county and to divide the monitoring area.In this study,taking Shunchang county as an example,it first determines the dominant type of cultivated land quality in the county,and then selects the driving factors of each gradient type to construct the index system of each type of gradient area.Then the typical region of the gradient type is obtained by the multi-factor weighting method and spatial overlay method.At last,this study verifies the division of monitoring area combined with field investigation.The main conclusions are as follows:1.Cultivated land is mainly paddy field in Shunchang county,and the slope is concentrated in 0-15 degrees.Most of the cultivated land is affected by terrain topography and concentrated in the mountain basin and the valley basin.The quality of cultivated land is at a moderate level,and the distribution in geography is basically the downward trend from the basin to the mountain,from the city center and the town area to the remote areas.Soil is mainly paddy soil which includes Gleyed paddy soil,Paddy soil,Hydromorphic paddy soil.These soils are widely distributed.2.Based on the gradient type of cultivated land quality in Fujian Province,integrating the cultivated land topography,soil,climate,hydrology,agricultural production,labor and other factors in Shunchang County,it is determined that the dominant types of arable land quality in Shunchang County are gradually waterlogging type,fertility decline type,fertility improvement type and acidification type.The typical region of the dominant gradient type is generally consistent with the distribution of the dominant driving factor of the gradient type,and the dominant driving factor is the soil type.Determining the dominant influencing factors or driving factors can roughly divide the distribution area of the dominant gradient type in the process of determining the dominant gradient type of cultivated land quality in the county.3.Each type extracts the typical area of the gradient type according to the index type system and method.The typical area of the gradient type extracted by spatial superposition is used as the main area for field investigation and verification.According to the principle of dominance,the monitoring area is divided,which avoids the blindness of field investigation,reduces the difficulty of monitoring work,and reduces the workload.