| The Xi’an section of the piedmont of north Qinling Mountains is an important urban water source in Xi’an.Currently,there is a conflict between the spatial pattern of urban water source in the piedmont of north Qinling Mountains and the ideal landscape function,resulting in inadequate ecological system service functions such as water conservation,soil conservation,biodiversity protection,and cultural services.It has led to limitations in the sustainable development of the region.Based on the theories and practices of landscape planning in the discipline of Landscape Architecture,this problem can be extended to "how to enhance the ecological system service functions of urban water source".The solution is "to use reasonable land development methods to enhance landscape functions",which points to the understanding and application of the "pattern-process-function" mechanism.Therefore,the key question is: how to apply the "pattern-process-function" mechanism to guide spatial control and maximize the landscape functional benefits of urban water source?This thesis focuses on the Heihe River Basin in Xi’an,which is located at the piedmont of north Qinling Mountains and is the main source of urban water supply in Xi’an.Based on the key question,the research objectives are as follows:(1)It uses the "pattern-process-function" mechanism,proposes an "spatial mechanism" analysis path to identify important patches and main causes of conflicts between the current spatial pattern of the Heihe River Basin and its ideal functional status.(2)It follows the "pattern-process-function" relationship,proposes control measures for the Heihe River Basin in Xi’an based on the "spatial mechanism" analysis to optimize patterns and achieve functional benefits.To achieve the research objectives,the following methods are mainly used:(1)Quantitative analysis methods in landscape ecology are used to analyze the evolution of spatial patterns and evaluate landscape functionality in the "spatial mechanism" analysis.Methods such as geographic detection and spatial autocorrelation are used for the "pattern-function" relationship analysis.(2)Ecological network planning methods and functional zoning are used for planning and control at different scales in the spatial control measures.The main research content includes: 1)the sorting of basic theories and the establishment of a research framework,matching key issues with the "pattern-process-function" mechanism as the core,forming a transmission path from the core basic theory to the application of basic theory,and establishing a research framework based on the corresponding theory.2)"Spatial mechanism" analysis,based on the "pattern-process-function" mechanism,on the basis of spatial and temporal evolution analysis of patterns and functions,through landscape function balancing and collaborative analysis,as well as factor detection and bivariate spatial autocorrelation analysis based on "pattern-function" relationships,identifying important patches and the causes of spatial conflicts in the Heihe River Basin of Xi’an.3)Spatial control optimization,following the "pattern-process-function" relationship,corresponding control measures are taken at three scales--the whole basin,sub-basin,and conflict patches of the Heihe River Basin in Xi’an.The eco-network planning method is used to identify the key source of the whole basin,conduct functional zoning,propose corresponding strategies,and then combine the "spatial mechanism" analysis to optimize the important patches of "pattern-function" conflicts.The following conclusions and innovations are obtained:1)The key problem of "pattern-function" spatial conflicts is clarified,and a corresponding research framework is proposed.Based on the universal planning framework of "investigation-analysis-planning",it is identified that the key issues and specific research content of this study are the identification of spatial conflict areas,the recognition of their causes,and the planning methods used to address them.Accordingly,it is proposed to use "spatial mechanism" analysis to identify spatial conflict areas,explain the causes of conflicts,and use a spatial control mode that combines pattern optimization and functional zoning based on the analysis.Corresponding spatial control measures are taken at the basin,sub-basin,and important patch levels to ultimately form a research framework for landscape planning in the Heihe River Basin of Xi’an.2)Applying the "pattern-process-function" mechanism to identify spatial conflict areas and analyze their causes.Starting from how to apply the "pattern-process-function" mechanism to analyze the problem of "pattern-function" spatial conflicts,the basic analysis method of factor stacking is used to identify spatial conflict areas.First,the evaluation and statistical analysis of pattern(spatial variable "x")and function(objective variable "y")are conducted,and then,through factor detection and bivariate spatial autocorrelation,the "pattern-function" spatial conflict areas in the Heihe River Basin of Xi’an are identified,and the important patches of conflicts are obtained.Based on the deduction of the main ecological processes that affect landscape functions,the mechanism processes that affect the important patches of spatial conflict are analyzed to obtain the causes of the spatial conflicts.3)Constructing a spatial control path that combines pattern optimization with functional zoning.With the aim of restoring the spatial conflicts unique to urban water source,a spatial control path suitable for the urban water source in the piedmont of north Qinling Mountains in Xi’an is constructed based on the analysis of "spatial mechanisms".Starting from the spatial conflicts caused by the repair of the "pattern-function" relationship,an ecological network is constructed based on the identification of important source areas,nodes,and corridors in the entire watershed based on the landscape functions in the region.Then,at the sub-watershed level,the land use direction and control optimization strategy of each watershed are clarified based on the functional characteristics identified in the source areas through zoning guidance.Finally,high-value patches that generate spatial conflicts in the key repair areas are controlled and repaired. |
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