| With the advancement of urbanization,the development of society,economy also caused environmental damage and land waste,industrial decline,serious threat to the sustainable development of landscape space,which makes the landscape heterogeneity space plaques and higher degree of fragmentation problem is particularly prominent,so that the spatial pattern and function all showed different degrees of change.In this context,from the perspective of large-scale landscape,it is expected to promote the consolidation of spatial elements and the comprehensive renovation of landscape space by relying on the comprehensive and global characteristics of the concept of landscape,so as to realize the goal of optimizing and adjusting the resource allocation of rural space.It provides an important theoretical basis for guiding the designation of territorial space planning scheme and has practical significance for promoting the rural expression of park city.Taking the Dujiangyan Irrigation District as an example,the temporal and spatial evolution of regional landscape pattern was explored by using dynamic attitude of land use area,land transfer matrix and landscape index,and taking the landscape as an important means of overall spatial development.Based on big data,the dominant function types of spatial units are analyzed,and the aggregation of different spatial elements is analyzed by means of location entropy,mean nearest neighbor distance and Moran index.Carry out the demand survey of regional development from multidimensional demand level;Based on the existing data and analysis results,the comprehensive evaluation of landscape space in Dujiangyan Irrigation District was carried out.The minimum cumulative resistance model was used to identify the key sources and corridors,and the CA-Markov model was used to predict the landscape pattern in 2030.Finally,based on the problems,requirements and simulation results,strategies and suggestions for regional sustainable development are put forward.Research shows that:(1)The landscape of Dujiangyan Irrigation District has obvious characteristics of stage change,and the transformation of spatial form and function is obvious.Up to now,the regional farmland and water system space has been integrated into the mechanization of farming,large-scale,regular high-standard farmland,formed a regular spatial layout.At the same time,the settlement model is affected by modern planning,and a large number of traditional scattered dwellings are replaced by new centralized rural residential communities.(2)Agricultural and ecological land was still the dominant land type in Dujiangyan Irrigation District,and the land area showed a change characteristic of "two increases and three decreases" during the research period.In terms of land transfer,it is mainly manifested as the conversion of ecological land to agriculture,construction land,and agricultural land to ecological land.As the ecological land is transferred out,the ecological patch becomes more scattered and the degree of fragmentation is increasing.However,the transfer of construction land makes the regional resources incline to cities and towns,and the quality and value of spatial ecology are reduced.As a result,the complexity and fragmentation of regional landscape pattern are prominent,especially in ecological land.At the same time,rapid changes make the landscape pattern tend to be fragmented.Economic development,industrial and population changes and policy orientation are the main factors leading to the change of landscape pattern.(3)The overall quality of spatial function is weak,and the difference of functional quality between towns is obvious.Among them,non-construction land functions are distributed in contiguous type in space,showing the characteristics of agglomeration.The number of functional space of construction land is small,and its distribution is scattered in space,mostly linear along roads.Although there is a certain degree of functional aggregation in towns,there are obvious differences in supply between towns and inside and outside towns,and the overall balance is insufficient.In terms of functional quality,the difference of mixing degree between inside and outside the town is especially obvious.The single function outside the town shows strong superiority in the content of spatial units,and the function combination degree is low.(4)Users have a general environmental awareness of Dujiangyan Irrigation District,and the overall satisfaction is high.At the same time,users have strong demand for regional space,especially in the beautiful environment,service quality and communication activities.Residents and tourists have different demands for service quality.For residents,infrastructure is the most urgent type of service facilities,showing a high concentration in space.Tourists regard commercial facilities as the most urgently needed type of service facilities in the region,and have a strong demand for the richness of activities,which reflects the low-quality tourism content in the region.(5)The comprehensive sensitivity level of Dujiangyan Irrigation District is high,and the low-sensitive areas are distributed around towns and roads,forming a group and linear aggregation.The highly sensitive and above space occupies 45.44% of the regional area,and the overall environmental sensitivity effect is good.These Spaces can be delimit the spatial boundary of different ecological security levels according to the comprehensive evaluation framework in the future.The areas with low sensitivity and below occupied 25.96% of the regional area.These areas formed point-like spatial distribution characteristics around towns,and appeared linear aggregation on the main traffic arteries in the central and northern parts of the region,reflecting the development trend of transport-oriented urbanization.At the same time,in the key space of regional landscape,4 ecological corridors and 27 recreational corridors constitute a comprehensive network of spatial development of regional landscape.The corridor lines with a total length of 403.66 km form a spatial network of branching interconnection and linear distribution along the road,which provides a good foundation for regional ecological and recreational space development in the future.(6)The landscape pattern of Dujiangyan Irrigation District in 2030 showed a trend of slow development,and each land use type showed a change characteristic of "three increases and two decreases",that is,the increase of agricultural land,water area and unused land,accompanied by the decrease of construction land and ecological land.However,the overall number does not change much,indicating that regional spatial connectivity has been improved to a certain extent and the degree of fragmentation has been alleviated.In the future,landscape pattern will show a trend of slow development and the degree of spatial fragmentation has been alleviated.Based on the comprehensive analysis of the landscape spatial changes,patterns and functions of Dujiangyan Irrigation District,this paper aims at sorting out the multidimensional management and control strategies and development proposals based on the combination of development and elements in order to guide the future spatial delineation of "three districts and three lines".At the same time,it is pointed out that the protection and restoration of ecological space in Dujiangyan Irrigation District should be carried out with restrictive strategies.The strategy of dynamic development should promote social and economic development under the premise of ensuring ecological priority,so as to realize the coordinated development of protection and utilization of Dujiangyan Irrigation District in the future. |
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