The Evaluation And Management Information System Development Of Farmland Productivity In Wangcang County Of Guangyuan City

This research chooses Wangcang county in Guangyuan city,Si chuan province as the research area,in the three years from 2007 to 2009,by conducting soil fertilizer investigation,testing and field test,on the basis of demonstration,etc,in accordance with the county cultivated land resources management information system data dictionary," base on ArcGIS10.2 and county cultivated land resources management information system(hereinafter referred to as CLRMIS)V4.0,with administrative zoning and soil type profile and land use status chart of interset division farmland productivity evaluation unit.In county cultivated land resource management information system of farmland productivity calculating comprehensive index,the cumulative frequency curve method to get the cultivated land fertility level and draw the cultivated land fertility level pattern.According to the county for cultivated land resource management information system and evaluation results in the study area of cultivated land in the analysis of existing problems,and puts forward the sustainable use on cultivated land resource effective Suggestions.The main achievements made in this study are as follows:(1)The Wangcang county farmland soil is concentrated in the neutral environment(6.5<pH?7.5),accounting for 54.55% of the total farmland in the county.The SOM content of farmland is 20~30g/kg and 30~40g/kg,which respectively accounted for 67.59% and 24.44% of the total farmland in the county,and it is at a moderate level.The average content of SOM in the farmland of Yingcui town and Zhengyuan township is 10~20g/kg,which is in lack of level,and the SOM content of all kinds of soil species exceed 20g/kg;The AN content of farmland soil is mainly 90~120mg/kg,which accounted for 68.73% of the total farmland in the county,and it is at a moderate level.The AN content is at a moderate level in all kinds of county and soil species;The AP content of farmland soil is mainly 10~20mg/kg,which accounted for 53.14% of the total farmland in the county,and the average content of AP in the farmland of Mumen town and Nongjian township is below 5mg/kg,which is in a very short level.And the content of AP in the farmland soil of Hualong town?Longfeng town?Daliang town and Jiulong township is 5~10mg/kg,which is in lack of level.The AP content of all kinds of soil species greater than 10mg/kg,which more than at the medium level.The AK content of farmland soil is mainly 50~100mg/kg,which accounted for 60.75% of the total farmland in the county,and it is in lack of level.(2)In accordance with the integrated fertility index of Wangcang county and the fertility of cultivated land of national,cultivated land productivity in Wangcang was classified into seven grades using the cumulative value method.Evaluation theme maps of cultivated land productivity and statistics were carried out using ArcGIS10.2.The area and percentage of the first,second,third,fourth,fifth,sixth and seventh grade were 33072.4acre,12.00%,55177.7acre,20.02%,49635.8acre,18.01%,46864.7acre,17.00%,38590.6acre,14.00%,30264.5acre,10.99%,21989.3acre,7.98%.(3)According to the soil fertilizer professional statistics system of national,divide the medium and lower-yield fields of Wangcang county farmland.High yield field include the first and second grade,medium field include the third?fourth and fifth grade,the sixth and seventh grade were divided into low yield field.The area and percentage of the middle-and-low-yielding fields,middle and low yield soils,medium yield fields and low production soil were 49111.4acre,17.82%,138233.5acre,50.16%,138333.7acre,50.19%,49011.2acre,17.78%.Overall the medium and lower-yield fields soil is 187344.9acre,the proportion of the total area of farmland of 67.98.(4)According to the classification of the medium and lower-yield fields and the improvement of technical specification,the medium and lower-yield fields type of Wangcang county was determined to the southern paddy farmland type of arid irrigation(fertilizer),stained by waterlogging gley type and southern hilly region of ladder type or poor fertilizer.We should reform the medium and lower-yield fields according to local conditions,and fertilize the soil scientifically and rationally to improve soil fertility.