Analysis Of The Response Of Landscape Pattern In Yueqing Bay Coastal Zone To Hemeroby

The coastal zone is a transition zone from ocean to land.With the continuous development of the coastal economy,the contradiction between man and land has become more and more prominent,and people have developed and utilized the coastal zone more and more.A large area of the coastal zone is used by people for economic activities such as breeding,tourism,and salt drying.In recent years,the use of shallow tidal flat resources for aquaculture and development of agricultural production has also become an important development trend in the coastal zone.Various development and construction have made the coastal zone tidal flat wetlands a valuable asset for the development of the ocean and the development of the marine industry.However,in the process of ocean development,unreasonable development and utilization models can not only improve economic development,but also cause damage and waste of coastal natural resources,environmental pollution,ecological deterioration and other ecological problems.Beginning in the 21 st century,as the contradiction between people and land continues to intensify,the reclaiming of land from the coastal zone has become a craze for the development of coastal areas.With the continuous development of urbanization and the continuous enhancement of human activities,the landscape of the coastal zone of Yueqing Bay in Zhejiang Province has changed significantly,and it has become one of the bays with the highest area and proportion of land reclamation in the country,causing great damage to the ecological environment in the bay.Therefore,it is imperative to study the quantitative calculation of hemeroby in the coastal zone of Yueqing Bay and the response of coastal landscape to human activities.This paper takes 24 towns and townships along the coast of Yueqing Bay as research areas,uses GIS spatial analysis,landscape pattern analysis,hemeroby analysis and other spatio-temporal analysis methods,uses fishing net tools,uses grid methods,sets up evaluation units,and studies Yueqing Bay from 1995 to 2015 Spatio-temporal changes in hemeroby and landscape pattern index,and explore the response of landscape changes to human activities.The result shows:(1)From 1995 to 2015,on the whole,the landscape type and area of the Yueqing Bay coastal zone have changed significantly due to the interference of human activities.The main performances are as follows: The area of forest land decreases year by year.From 1995 to 2015,a total of 5142.25 ha decreased.Among them,there was a slight increase from 1995 to 2000.The main reason is due to reclamation in the Yuhuan area.The overall cultivated land area is decreasing,with a total decrease of 6,865.63 ha in 25 years,of which the decrease in the first 15 years is obvious.After 2010,the change in cultivated land area tends to be flat;The area of construction land(including urban land and other construction land)has increased year by year.Among them,the area of urban land has increased by 11324.01 ha compared with 1995,especially after 2000;The tidal flat area presents a change that increases first and then decreases.(2)Based on previous research results,this paper selects six landscape pattern indexes to explain the landscape changes of Yueqing Bay.The results show that: from 1995 to 2015,the shape index(LSI),patch density(PD),Shannon diversity index(SHDI)The square pixel index(SQP)rose overall,the maximum plaque cooked(LPI),spread index(CONTAG),and aggregation index(AI)decreased overall.The overall degree of landscape fragmentation in the study area increased,and the difference between patches Connectivity gradually weakens and landscape heterogeneity increases;the spatial distribution tends to be decentralized,but after 2010 there is a slightly slower trend and it starts to tend to be integrated;The shape of the landscape began to become more complicated,with a slight regularization trend after 2010;the richness of the landscape increased year by year,and the dominance decreased,and various types of patches showed a balanced distribution trend in the landscape.This indicates that with the continuous acceleration of economic development and urbanization,human activities have intensified,resulting in the gradual fragmentation of plaques in coastal landscape types,the distribution of plaques is more dispersed,the complexity of landscape shapes is increased,the distribution of plaques is balanced,and the landscape Features such as increased heterogeneity indicate that the landscape pattern index can better characterize the changes in human activity.(3)The selection of the evaluation unit will affect the quantitative calculation results of the degree of human interference,and at the same time have an impact on the results of the response to the discussion of landscape changes and human interference.When discussing the spatial distribution of man-made interference,the smaller the scale of the evaluation unit,the better the results displayed and the closer to the actual situation,but the larger the amount of data.This paper proposes to select an evaluation unit with an accuracy of 1 × 1km to analyze the spatial differentiation law of anthropogenic interference in the coastal zone.In this paper,from the quantitative measurement of hemeroby in the coastal zone of Yueqing Bay and its response to landscape changes,it is found that there is a certain correlation between hemeroby and landscape pattern index,and there is an obvious "turning point",mainly manifested in: When human activities are in a low-interference interval(1?HI <4.5),as the degree of hemeroby increases,the degree of landscape fragmentation increases,diversity increases,landscape abundance increases,the maximum patch index gradually decreases,and patches Dominance decreases;while in the high interference range(4.5?HI?7),as human interference continues to increase,the connectivity between patches increases,the landscape tends to be integrated,and the dominance of the largest patch gradually increases.(4)From 1995 to 2015,the overall anthropogenic interference level(HI)of Yueqing Bay showed an upward trend,mainly with low and medium interference levels,but the evaluation units of medium interference level,medium and high interference level,and high interference level increased year by year,which shows that Yueqing Bay The interference of regional human activities on the coastal zone is on the rise.In terms of spatial distribution,the overall HI in the northern part of Yueqing Bay is relatively weak.The HI in the eastern coastal areas of Yueqing City and Yuhuan City has changed greatly.The range of medium-high interference areas and high-interference areas has gradually expanded.It is also related to the topography of the coastal zone.Generally speaking,the plain area is conducive to human activities.The HI value is large and tends to expand around.Taking HI = 4.5 as the "turning point",the Pearson correlation coefficients between the landscape pattern index and the degree of hemeroby are calculated respectively.The results show that: When human activities are in the low-interference interval(1?HI <4.5),the maximum patch index(LPI),patch density(PD),and spread index(CONTAG)are significantly negatively correlated with the degree of hemeroby(HI),Shannon Diversity index(SHDI),Shannon uniformity index(SHEI)and square pixel index(SQP)are significantly positively correlated with hemeroby(HI).At the type level,the square pixel index also has an obvious "turning point" in the process of increasing and changing HI.The change trend of the landscape shape pattern index on both sides of the turning point is diametrically opposite.In different interference stages,the SQP index changes in different directions,indicating that as the intensity of human activity continues to increase,the surface morphology undergoes the process of first breaking,complicating,and then homogenizing,that is,simple(single)-complex-simple(Single)a process of development and change.(5)The core areas of human activities(Lecheng Town and Zhugang Town)have a trend of increasing hemeroby along the coast as a whole,but the direction of human activity gathering is different from that of time.The increase in human activities in Lecheng Town is obviously mainly from 2010 to 2015 The eastern coastal areas shifted,and the human activities in Zhugang Town were strong in 2000-2010,mainly concentrated in the central and eastern and southeast.