Study On Land Ecological Security Evaluation And Sustainable Utilization In The Yellow River Delta

The land system is a complex ecosystem,which is affected by a variety of factors.It is composed of a variety of compound factors and is closely related to the production and life of human beings,which directly affects the development of our national economy.However,with the intensification of human economic activities and irrational exploitation and utilization of land resources,the natural land cover pattern has been dramatically changed,and people's conflicts have become increasingly prominent.The land use intensity has reached or even exceeded the ecological capacity of the land,resulting in the deterioration of the ecological security situation of the regional land and the unsustainability of land use,which seriously affects the ecological and environmental security of the region and threatens the sustainable development of the region.Therefore,the comprehensive study on the ecological security situation of regional land resources is the core and foundation of the sustainable development of land resources,which is related to the speed of regional socio-economic development,the rational utilization of resources and the strength of ecological environmental protection.Based on the related concepts and theories of land ecological security theory,human-land system coordination theory and land sustainable utilization,this paper analyzes and summarizes the ecological security problems of the land system in the Yellow River delta through the analysis of the change of land use quantity in the Yellow River delta,the evolution of land use type,the dynamic change of land use and the change of land use structure.According to the characteristics of the Yellow River delta region,a total of 20 indexes are selected from the natural ecological sub-system,the economic ecological subsystem and the social ecological subsystem,and the land ecological security evaluation index system based on the"natural-economic and social"model is constructed.Using entropy method to determine the index weight,the synthetic index method to evaluate the ecological safety of land in the Yellow River delta of2005-2015,the evaluation of the land ecological safety rating,and the grading of the land ecological safety in the districts of the districts in the district,and analyzing the evolution of the spatial structure of the land in the whole area.This paper analyzes the influencing factors and puts forward the ways and countermeasures of sustainable land resource utilization.The results are as follows:(1)compared with the three remote sensing images in 2005,2010 and 2017,the overall trend in the 12 years has shown the following:the overall trend of land area in the study area is decreasing,and the land area in 2005 is 264.71×10~4hm~2,and the land area in 2017 is 263.67×10~4hm~2.From the county level,there is a trend of shrinking land area in all counties and counties.The area of hekou district,kenli county and zhanhua county is the largest,with 12792.1 hm~2,12722.4 hm~2and 10446 hm~2respectively,and other counties have decreased in different degrees.Only hanting and shouguang land area increases,respectively increased by 32997.69 hm~2 and18970.7 hm~2.(2)from 2005 to 2017,the land use situation in the yellow triangle area has changed significantly,which is mainly cultivated land and construction land,followed by the water and unused land,and the change of woodland and grassland is not obvious.In which that area of the cultivated land,unused land and grassland is reduce and the specific gravity decreases;The area of construction land,water area and woodland is expanding and its specific gravity rises.The degree of dynamic change of land use is from large to small in order of water,woodland,construction land,unused land,grassland and cultivated land,and the whole land use system has a high overall disorder,and this disorder is expanding.In the urban areas of each county,the land use changes in the districts of dezhou and weifang and laizhou city and gaoqing county are consistent with the overall change of the yellow triangle area,the land use structure changes little,and the overall land use change speed of dongying city is relatively fast,while the overall land use change of binzhou city is very significant,and the land structure has changed greatly.The information entropy index is the highest in hekou district,kenli county and dongying district,and the land use structure is dispersed.(3)the problem of natural ecological safety is concentrated in the natural disasters of natural disasters,soil salinity,the simple structure of the vegetation and the coastal erosion of the land and the area of the land;The problem of land economic and ecological safety is that the use of oil and fertilizers,and the use of chemical fertilizers,has caused the soil structure to be destroyed,and the soil mass has dropped;The problem of land social ecological security is that the rapid increase in population increases the pressure of land,the expansion of the land,the development of the land,the unreasonable development of the land and the unreasonable structure of the land.(4)the comprehensive index of land ecological security in the Yellow River delta region in2000-2015 showed a trend of fluctuation,and the land ecological security situation in the yellow triangle area gradually improved.Except for 2010,the land ecological security state in the whole region was in a safe state,and all other years were in a critical state of safety.15 years,19counties in Yellow River delta land ecological security composite index were between the?to?,in less safety and critical safety state of wing is more,only laizhou city land ecological security in a safe state.And most counties of land ecological security composite index rising,the ecological security level from levels?rise to?,land ecological security status improving,but the estuary,kenli county,hanting,shouguang,bincheng and zhanhua land ecological security composite index are the overall downward trend,land ecological security status show signs of deterioration.(5)The factors affecting the land ecological security situation of the Yellow River delta are summarized as natural elements,economic factors and social factors,and the countermeasures for sustainable land use are put forward:optimizing land use structure and rationally allocating land resources;Construct a high efficiency ecological industry system to reduce the degree of land pollution;Overall planning for land use,a blueprint drawing to the end;Strictly land control,increasing land productivity;Increase that quality of the population and establishing a sustainable awareness of the whole nation;Building a land ecological safety assessment alert system,promoting environmental monitoring systems;Improve laws and regulations and strengthen law enforcement.This paper takes the whole area of the Yellow River delta and its counties as the research object,and USES the social development statistics collected from satellite remote sensing data and statistical yearbook as the basic data.The current situation of land resources exploitation and utilization in the Yellow River delta and the evaluation and analysis of the land ecological security in the Yellow River delta are respectively carried out,which makes up the uniqueness and one-side of the traditional analysis method,and has certain reference value for future research.The results of the evaluation of land ecological security in the Yellow River delta are analyzed in terms of time series and spatial pattern,and the land ecological security situation and development trend of the Yellow River delta region are measured more accurately.In this paper,there are some problems in the research process:in the analysis of the current situation of land resources utilization in the Yellow River delta,due to the large study area,the remote sensing images of the continuous years were not obtained,only the remote sensing effects of 2005,2010 and 2017 were selected for processing.In the process of processing,there was human error in the interpretation of remote sensing,and the data of interpretation was inevitably inconsistent with the actual situation,which could not accurately reflect the utilization of land resources in the Yellow River delta,and lack the prediction of the future land use situation.In the evaluation of land ecological security,the selection of land ecological security indexes is one-sided,and the evaluation index system of land ecological security needs to be improved,and the evaluation method is too simple to be strongly representative.In the future research,better technology can be used to improve the accuracy of remote sensing interpretation,collect more detailed information,and make more accurate analysis of land use change and land ecological security situation in the research area;Using more accurate data,we can predict the current status of the land in the field,and the trends of the land use and the ecological safety of the land,and predict the future of the land use of the land,and the trends of the land ecological safety;It is necessary to perfect that evaluation index system of land ecological security,to select the evaluation model and evaluation method of the more rational scientific way,to get more rational scientific result and analysis.