Study On The Improvement Of Cultivated Land Quality Based On Limited Factor Analysis

The quality level of cultivated land is low in our country.The restriction factor of the cultivated land itself is the key to the improvement of the quality of cultivated land.The identification of the limiting factors affecting the quality of cultivated land and its distribution are the basis for the scientific implementation of the land renovation project and the improvement of the efficiency.Based on the data of cultivated land quality in 2015 and taking Baoji as the research area,based on the analysis of the spatial and temporal distribution characteristics of the quantity and quality of cultivated land,this paper grasps the current situation of cultivated land in Baoji City,and uses the ploughing map spot as the research unit to determine the type of the limit factor and its distribution characteristics through the "natural equal potential" model.The influence degree of various restrictive factors on the quality of cultivated land is determined,and the spatial autocorrelation analysis method is used to divide the area of cultivated land quality promotion potential,and the measures to improve the quality of cultivated land are put forward by the distribution of the limiting factors in the study area.This research mainly draws the following conclusion:(1)there are 12 limiting factors of cultivated land quality in Baoji,among which 8 are single factor and 4 are combination factor.The quality limiting factor of cultivated land in Baoji is dominated by single factor limiting type,and the single factor restrictive type accounts for 94.65% of the total area of cultivated land in the city,and the ratio of combination factor restrictive type is 5.35%.The limiting factors include soil limitation,irrigation restriction and organic matter limitation.The limiting factors include soil layer irrigation limitation,soil erosion limit,organic matter slope limitation and section irrigation restriction.Longxian,Qianyang county and Lin You County in the Loess Plateau of the Weibei Loess Plateau are mainly restricted by erosion and soil layers,and the 3 districts in the 4 counties,such as Chen Cang District,Jintai district and Fufeng County,in Guanzhong plain area,are dominated by soil layer restriction,irrigation restriction and organic matter limit,Taibai county and Fengxian,located in the southern Shaanxi Province of Qin Dynasty,are restricted mainly by soil layer.The main limiting factors are organic matter restriction and soil layer restriction,and the main limiting factors are soil layer restriction,irrigation restriction and slope limit,and low land limit factor is mainly erosion restriction,soil layer restriction and slope limit.(2)the potential for improving the quality of cultivated land in Baoji is at a medium level,and shows certain agglomeration characteristics in space.The potential for improving the quality of cultivated land is at a moderate level,and shows a trend of high north and low south.The cultivated land with low promotion potential is mainly concentrated in the Weihe plain area with good water and heat conditions,mild and humid climate in Guanzhong plain area,including Fengxiang County,the east of Chen Cang District,and the northern region of Fufeng county and Meixian County.The cultivated land with middle level of upgrading potential is mainly distributed in the northern part of Longxian,Jintai district and Weibin district.The high arable land is mainly distributed in Longxian,Qianyang County,Lin You County,and the western part of Chencang District.(3)There are 334 administrative villages in Baoji.The potential of cultivated land quality improvement is "HH" type,which can be included in priority areas of land consolidation.According to the result of the potentiality analysis of the quality improvement of the cultivated land,there are 334 villages which belong to the grade I area of cultivated land quality,and the proportion is 19.43%;the villages belonging to the grade II area of the cultivated land quality promotion potential are 97,and the proportion is 5.64%;the villages belonging to the grade III area of the cultivated land quality promotion potential are 359,and the proportion is 20.88%;cultivated land is cultivated land.There are 929 villages in the fourth class area where the potential for quality improvement is up to 54.04%.The cultivated land quality improvement potential is high and "HH" type distribution.The cultivated land in this area can be optimized into the key areas of land regulation,and it is suggested to increase the intensity of land renovation projects and improve the overall level of the quality of the cultivated land.(4)according to the distribution characteristics of limiting factors,the measures for improving the quality of cultivated land in Baoji also have certain regional distribution characteristics.Soil restriction,organic matter restriction and irrigation limitation are widely distributed,which account for 66.11% of the total area of cultivated land in Baoji.Therefore,Baoji should focus on the improvement measures of land restriction,organic matter restriction and irrigation restriction.In addition,Longxian,Qianyang and Lunyou counties in the Loess Plateau of the Weibei province should strengthen the improvement measures for the erosion restriction.Taibai county and Fengxian County of the Qin Bazhong mountain area in the southern Shaanxi Province should strengthen the improvement measures of the bare rock restriction and the terrain restriction.