| The introduction of the "double carbon" target and the rural revitalization strategy have put forward higher requirements for ecological construction and green development in villages.Focusing on rural green infrastructure(RGI)in the evaluation system of green and livable village and town planning,the study of rural green infrastructure by applying geographic information data and applying morphological spatial pattern analysis(MSPA)techniques and low-carbon and carbon-fixing indicators to the optimization of the pattern of RGI is conducive to the optimization of RGI supply and rural ecological construction,so as to improve the current evaluation system of green and livable villages and towns and solve the problem of insufficient dual-carbon related indicators are insufficient.The study uses GIS data to mine the spatial characteristics of RGI,introduces overlap indicators and integrates them into the evaluation system,realizes the practical process of data acquisition-spatial data analysis-extraction of evaluation elements-application of the evaluation system,and achieves a supplement to the existing RGI pattern optimization method.Firstly,by combing through the domestic and international literature on green infrastructure(GI),MSPA and "double carbon",it is found that there is great potential for carbon emission reduction through GI research,and relatively little research has been carried out to further refine the spatial structure of GI based on MSPA.The trend of existing research has been to focus on quantitative spatial evaluation,using MSPA to identify the spatial characteristics of the current RGI and to propose guidance.At the same time,although there are more studies related to GI with the goal of reducing carbon emissions,fewer studies have weighed the multifaceted benefits and considered them comprehensively in conjunction with ecological benefits.Therefore,the study proposes to apply MSPA to the optimization of the RGI pattern under the objective of "double carbon".Taking Suining County as an example,the study analyzed and evaluated the characteristics of 15 towns in Suining County in terms of ecological spatial structure,ecological internal element composition and land use element transformation.The spatial structure of each town was judged to be "high in quality but fragmented",and the overlap analysis yielded the spatial structure characteristics of "single composition,less woodland and water corridor".In terms of ecological and carbon sink efficiency,the RGI has a high homogeneity,relatively balanced connectivity and large differences in carbon sink efficiency in terms of patch fragmentation.Afterwards,the correlation analysis of "land use composition-ecological efficiency/carbon sink efficiency" based on the RGI network in Suining County and the analysis of the causes of the research results were carried out to make a comprehensive evaluation of the RGI.The correlation analysis of each town shows that farmland that can be transformed into core substrates and water bodies that can be transformed into ecological corridors have better ecological efficiency,and when the proportion of water bodies in the main ecological substrates is higher,the more farmland can be transformed into main ecological corridors,the stronger the carbon sink efficiency.By tracing the correlation results,it is found that,as the development of Suining County is still dominated by agriculture,the better scale construction and ecological use of farmland improves its ecosystem service efficiency;the small scale,scattered and fragmented forest land and water bodies are not conducive to their ecological services;in terms of carbon sink efficiency,the opening of floodgates and the mechanized farming of large-scale farmland in Suining County affect the carbon sink storage.Finally,based on the evaluation results,suggestions and strategies for optimization are proposed: from an ecological perspective,cultivated land should be concentrated and optimized on a large scale,the main ecological substrates should be enriched through woodland,and the connectivity of water bodies should be ensured by establishing strip watersheds;from a carbon sink perspective,the construction of surface water bodies should be strengthened,and the development orientation of modern agriculture should be taken into account,and cultivated land should be combined with rice cultivation systems,straw returned to the fields and organic fertilisers applied.The research practice in Suining County shows that the evaluation system with overlap indicators constructed in this thesis can make a more accurate analysis of the local RGI situation,and the results can be fully integrated and shared with the research on the subject,revealing the influence of the overlap between land use and spatial landscape on the efficiency of ecosystem services.Spatial landscape overlap can be used to assess the degree of connectivity between different ecosystems,thus supporting and guiding the design and establishment of ecological networks with better landscape connectivity to protect and maintain the integrity and stability of ecosystems.Land type overlap is used to study the effect of overlap on the effect of ecosystem services at the site structure level.It is ecologically useful for assessing ecosystem stability predicting species migration and habitat connectivity,and guiding site planning and land management,reflecting the distribution and interrelationship of different habitat types in an ecosystem and providing information on ecosystem stability.This thesis is based on the requirements of the subject,and the relevant village and township basic data are available through open channels on the Internet,which can be analyzed and evaluated on a large scale,and have a good ability to be promoted and applied.From the findings of this thesis,we have highlighted some of the optimal guidance strategies for RGI development.We should recognize that large-scale construction of arable land is a good guide for the development of plain agriculture and an effective measure to improve landscape fragmentation,which,although not necessarily conducive to carbon sequestration from data analysis,can be addressed by choosing to enrich the structure of crops grown and implementing better quality farmland management.Future ecological conservation strategies should focus more on land planning measures. |
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