Research On Differentiated Rural Land Renovation In Chongqing

With a large population in China,it is very necessary to conduct differentiated research on rural land consolidation in the context of domestic food security,economic transformation and development,rural revitalization,and the construction of a beautiful China.This paper uses soil use data(2015),land use planning(2006-2020),topographic data,project construction data,and participatory rural interview data,using Arc GIS 10.2software spatial analysis function,Hydrology model,suitability index,entropy weightTOPSIS model,Tyson polygon and other methods and models are used in the typical karst trough area,Baiyun Township,Wulong District,Wulong District,the farmland irrigation system,the middle and low mountain gentle slope area,the road system of Longchi Village and Xingjia Village,Shashi Town,Yunyang County,and the Tongliang District of Fangshan Hilly Area Three typical research areas of pollutants in Huangmen Village,Nancheng Sub-district Office,conducted a differentiated remediation study.By analyzing the main problems in the three study areas,and providing differentiated land remediation countermeasures for the main problems,it hopes to provide a certain reference for the research on land remediation in Chongqing and other similar areas.The conclusion shows:(1)The distribution of irrigation and drainage systems in the karst trough and farming area of Baiyun Township,Wulong District is relatively scattered.The Shashizui reservoir in the south needs maintenance,and the distribution of ditches in the southeast is relatively sparse,requiring new irrigation and drainage ditches.The arrangement of ditches in the north is dense and can be simplified appropriately;The damage is serious and needs to be repaired and reinforced,and one irrigation ditch is abandoned in the southwest.Finally,the study area needs to build 7 new reservoirs with a total volume of1400m3,the reservoirs are mainly rectangular,the reservoirs are open and fully buried,the drainage and irrigation ditches are mainly made of mortar masonry,and there are 10 new drainage and irrigation ditches.The total length is 3241 m,mainly made of mortar block stones,and the construction method adopts the buried type,repairing and strengthening 3 Shanpingtang.(2)The road network in Longchi Village and Xingjia Village of Yunyang County has low density of road network,mostly soil pavement,which is difficult to pass.According to the regional topography and geomorphology,the distribution of arable land resources,the industrial development status,and the settlement distribution pattern are obtained.A hierarchical road system was constructed with "field roads as the skeleton,production roads as nodes,and production roads as support".Finally,a total of 7 field roads were maintained in the study area,with a length of 10.652 km and a width of 3.5-4.0m,in the north.There are 3 traditional grain and oil zones with a length of 3157 m,one western traditional grain and oil zone with a length of 618 m,one central walnut industry zone with a length of 3764 m,and two southern pepper industry zones with a length of3113 m.The pavement materials are all concrete pavement.4 newly built field roads with a length of 5866 m,the pavement width of 3.5-4.0m equivalent to the original field roads,14 new production roads with a length of 9754 m,a pavement width of 1.5-2.0m,and a concrete pavement Or gravel pavement.The newly built production roads are mainly distributed in the central walnut industry zone and the western traditional grain and oil industry zone,with lengths of 6104 m and 2289 m respectively,followed by the southern pepper industry zone with a length of 1361 m,and hardening of the unhardened gravel and soil field roads in the area.(3)The distribution density of pollutant disposal facilities in Fangshan hilly area of Huangmen Village,Nancheng Street,Tongliang District is small.According to the characteristics of “large dispersion,small concentration” of rural residential areas and the analysis of Tyson polygons,14 residential areas in the study area need to be relatively concentrated Layout of garbage pools in the area,and calculate the design capacity based on 0.86 kg per capita daily domestic garbage,and use mortar and bricks as the material.The spatial layout of ecological ditches is determined according to the relationship between the flow accumulation threshold and the density of the river network,with 3,500 being the optimal flow accumulation threshold.Finally,37 new ditches of various types were built,3 ditches were renovated,and the total length was 10570 m.The pond is mainly arranged at about 2.5m in front of the reservoir or at the intersection of the ditches.The sand sink is designed to have a net length of 2.0m,a net width of 1.0m,and a net depth of 0.8m.Aquatic plants are planted to absorb the nutrients in the sediment.Material: The newly built reservoir is mainly arranged at the rainwater confluence on the slope,that is,the outlet of the natural water collection path.Set up a vegetation buffer zone on the bank of the river with a width of at least 9m.Depending on the terrain and industrial positioning,the vegetation buffer zone can be adjusted appropriately after ensuring the minimum requirements.The width of the vegetation buffer zone at the drain outlet of the ditch should be larger than other places Bigger.