Evaluation Of Land Ecological Security In Henan Province Based On Spatial Measurement

With the rapid development of economy and society,especially the rapid development of industrialization and urbanization,the breadth and depth of land use have been pushed forward at an unprecedented speed,which has greatly changed the land use,land cover and surface morphology.Due to the limitation of knowledge and excessive attention to economic benefits,it will inevitably bring great harm to the land ecological environment and profoundly affect the sustainable development of human society.At present,land ecological security has become an important part of national security,and the study of land ecological security has become a frontier hot topic in land,ecology and other disciplines.Supported by GIS technology and methods,coupled with mathematical model,spatial metrology,spatial analysis of GIS,etc.Taking four time sections of Henan Province in 2000,2005,2010 and 2015 as study periods.By using the methods of triangular model,spatial analysis and spatial principal component analysis,the land ecological security status and trend,spatial and temporal differentiation characteristics and driving mechanism of Henan Province and 18 provincial municipalities were studied at provincial and regional scales.The results show that:(1)From 2000 to 2005,the land ecological security in Henan Province was generally in a weak state,but the trend of land ecological security was developing towards general security,and the level of land ecological security was increasing year by year.In 2000 and 2005,the land ecological security of 18 provincial municipalities in Henan Province was in a weak state.In 2010 and 2015,2 and 3 provincial municipalities were in a general state of security,while the other provincial municipalities were still in a weak state of security.In terms of trend,8 of the 18 provincial cities in Henan Province are in a fluctuating upward trend,9 in a stable upward trend,and 1 in a declining rate of land ecological security.(2)During the study period,the land ecological security index of 18 provincial municipalities in Henan Province was positively correlated in space,and showed a trend of agglomeration.The spatial correlation between provincial municipalities was strong.In Henan Province,the activities of high-value and low-value aggregation areas of land ecological security index are not large,and the changes of land ecological security are agglomerating,and the level of land ecological security between provinces and municipalities tends to be close.From the evolution trend of land ecological security,the security level of eight provincial municipalities continued to improve,the security level of six provincial municipalities fluctuated,and the security level of four provincial municipalities declined.The focus of land ecological security in Henan Province is near the junction of Zhengzhou City and Xuchang City.The moving direction of the center of gravity keeps moving northward and makes reciprocating movement in the East and West direction.The longest moving distance is 3553 m,and the level of land ecological security between regions tends to be stable.(3)The study found that land development and utilization,water resources pressure,urban land ecology and other factors are the main driving factors for the change of land ecological security level.In addition,driving factors such as natural environment,people’s living standards,economic development,land pollution and control also have a certain impact on land ecological security.(4)According to the trend of land ecological security status,the characteristics of space-time differentiation and the driving mechanism of land ecological security in Henan Province and 18 provincial cities under its jurisdiction,the paper proposes to enhance and protect the land ecological security in Henan Province from the persistence of increasing the protection of natural resources,Intensifying Land consolidation,establishing the urban agglomeration of land ecological security protection in Henan Province with Zhengzhou as its core,and accelerating the transformation and development of resourcebased cities.Land ecological environment,thus providing reference and reference for Henan Province to solve the conflict between land ecological environment protection and economic and social development,and to seek harmonious coexistence and common progress of land ecology,environmental security and social development.