Land Ecological Safety Warning Of Mountain Plains Transition Zones

With the frequent human activity, especially for the land use in increasing sizeand strength, a series of land ecological environmental damage has increased,becoming the main bottlenecks of sustainable utilization of land resources in China.Stemmed from the "ecological safety", research study on ecological security of landincreasingly has been a breakthrough in the regional problems of sustainableutilization of land resources. Mountain-Plains transition zones with a naturalgeographical interface are a geological border zone, which is a fragile ecologicalenvironment in China. When these zones exert the function of ecological barrier, atthe same time, these zones demonstrate the vulnerability of the natural environmentcharacteristics, which is a representative and practical significance of the objects ofthe area of land ecological security research in recent years.Minshan-Chengdu Plain is located in the typical Mountain-Plain ecologicalfragile zone in China, and the arid Valley of the Hengduan Mountains in Dujiangyanis exactly the typical ecologically fragile areas in Minshan-Chengdu Plain. So thisthesis selects the study case of Dujiangyan, Sichuan province, and put the earlywarning of land ecological safety as the research object, at the same time, it puts thestructural layout characteristics and evolutional trend simulation of the research objectas the main line running through the whole thesis. Based on man-land relationshiptheories, theories for land sustainable development, theories of land-use planning,eco-geological environment carrying capacity and land ecological security theory, andrelated theories and methods, it sets land ecological safety early warning system.Under the support of RS and GIS technology, it extracts early warning index dynamicinformation, and combines with the geographical statistical analysis, spatial-temporaltransform, and scenario simulation. In the meantime, through long time sequenced theevaluation of land ecological security warning, the thesis completely reveals landecological security spatial and temporal evolution law of warning before and after theearthquake in the Mountain Plain transition zone. It build zero scenarios,eco-environmental protection scenarios, economic development scenarios, and otherprofiles, with simulation and prediction the future development trend of regional land ecological security warning information. In addition, orienting the land planningoptimization, it puts forward basic model and optimization approaches of eliminatingwarnings regulation in Mountain-Plain of transition zone. At last, taking GIS as theprimary carrier of information and interaction with the database, it mixes Matlabprogramming, integration of fuzzy c-means clustering, Markov-cellular automata(Markov-CA), and probabilistic neural network model and algorithms. Based onCOM component technology, it achieves the development of " land ecological safetywarning system of Mountain-Plains transition zones (GLSW)", so as to establishmacro and large scales criteria and technical support for the land planning andecological protection, repair of Mountain-Plains transition landforms.Through the study of this thesis, it reveals land ecological security spatial andtemporal evolution law of warning of the research area for20years before and afterthe earthquake:When the research area is as a whole, from the aspect of size change, the hugewarning state land area has increased the most, and the light of warning state land areahas increased second. The annual rates of change of land ecological security warningtype before the earthquake from big to small are followed by light warning, nowarning, huge warning, middle warning, and heavy warning.From the aspect of spatial patterns, in the Mountain-Plains transition zones, thearea of huge warning and heavy warning of land ecological security, focus onbreakage structure of dense development, geological disaster and topographic relief inLow Mountain and High Mountain area. The area of light warning and no warninglarger of land ecological security concentrate on the Plains areas. In the Plain area, therelative rate of changes of no warning, light warning and middle warning are clearerthan other types, which are mainly affected by rapid social and economicdevelopment, scale expanding of urban-rural construction. The relative rate ofchanges of heavy warning and huge warning in the Hills and Low Mountains area isgreater than in the Plain area and High Mountain area, which primarily affected fromthe impact of earthquakes and frequent secondary geological hazards.Implementation land ecological safety simulation of early warning of differentdevelopment scenarios, the result shows that under zero scenarios, generally speaking,of Dujiangyan land ecological safety aggravated to some extent, and it needed to beadjusted with suitable plan methods; under eco-environmental protection scenarios,although there were decrease trends on the changes of warning of Dujiangyan landecological safety, especially the environment of hilly area had some improvement, thegreat decrease of cultivated land area had bad influence on production and life ofthose area, and the slow development of economy, it is impossible to pursueecological protection; under economic development scenarios, there were someincrease, although economy had all-round development, ecology haven’t hadimprovement in hilly area, so only pursuing economic development is also impossible.Combining with that three land planning of zero scenarios, eco-environmentalprotection scenarios, economic development scenarios, reference to land planning inMountainous and Hilly areas of the ecological environmental protection scenarios, thethesis puts forward land ecological security eliminating warning regulation ofMountainous and Hilly areas. At the same time, reference to land planning in Plainarea of the economic development scenarios, it also puts forward land ecologicalsecurity eliminating warning regulation of Plain areas. Therefore, it establishes basicmode and optimization approaches of land ecological security eliminating warningregulation in Mountain-Plains transition zones.Through study, it provided new criterion for succession of land ecologicalsecurity and warning control, enriched research theory and methods system, but alsoprovided new solving plan for the sustainable land use of Mountain-Plains transitionzones. It also had important practical significance on post-earthquake recovery andreconstruction and in the aspect of improving county land use and land managementdecision-making.