| Ecological restoration project of territorial space has become a major measure to promote China’s ecological civilization construction,and it is also an important part of the modernization of territorial space governance system and governance capacity.The goal of "carbon peaking and carbon neutrality" puts forward new requirements for the carbon effect of land space ecological restoration projects.Quarrying abandoned mines are an important part of China’s land space ecological restoration project,and the carbon sink potential is large,so in-depth analysis of the internal mechanism of carbon effect of ecological restoration project of territorial space in quarry-type abandoned mineland is of great significance for the ideas,strategies,management and implementation paths of land space ecological restoration of quarry abandoned mines,which is conducive to achieving a "win-win" situation between abandoned mine restoration and the dual carbon goal.Based on the theoretical foundations of low-carbon economic theory,ecological restoration theory,sustainable development theory,human-land relationship theory,and mining land reclamation theory,this study started from two perspectives: Firstly,the internal mechanism of carbon effect of quarrying abandoned mines is analyzed according to the influencing factors of the carbon effect of ecological restoration of land space,and then the carbon effect accounting framework is constructed.Secondly,the ecological restoration project of abandoned land space of Shikou Village quarry in Sanwan Township,Yongxin County,Jiangxi Province was used as an empirical study to analyze the actual situation of carbon effect changes in the project.Finally,based on its internal mechanism and actual cases,the driving force of emission reduction and sink increase of quarrying abandoned mines is deeply explored,which provides a reference for the emission reduction and increase of sink reduction and sink of similar quarrying abandoned mines.The main research conclusions are as follows:(1)Combined with the ecosystem characteristics and engineering implementation characteristics of ecological restoration project of territorial space in quarry-type abandoned mineland,the carbon effect was defined as the transformation of quarrying abandoned mines into a new,healthy ecosystem through land space ecological restoration measures.This includes the carbon emissions generated by the use of energy and materials during the restoration process,as well as all new carbon emissions and carbon storage resulting from the formation of the restored ecosystem.By comprehensively analyzing the changes in carbon emissions and carbon storage before and after ecological restoration of ecological restoration measures and ecosystems in the project area.The new carbon emissions and new ecosystem carbon storage generated by the whole process are the carbon effects of the ecological restoration of the land space of quarrying waste mines.(2)The influencing factors of the carbon effect of ecological restoration project of territorial space in quarry-type abandoned mineland were multifaceted and mutually restrictive,among which the impact of preliminary work and scheme design process was qualitative,and the carbon effect of construction construction in the restoration process and the increase of carbon pool before and after restoration can be quantitatively analyzed.The carbon source effect included the total carbon emissions from ecological engineering and the increase of carbon source land in the project area before and after restoration,and the carbon sink effect was the increase of soil carbon storage and vegetation carbon storage after conversion from bare abandoned mine to carbon sink land,that is,the total increase of carbon pool in the project area before and after restoration.(3)Taking the ecological restoration project of territorial space in quarry-type abandoned mineland in Shikou Village,Sanwan Township,Yongxin County,Jiangxi Province as an empirical study,through statistics and calculations of the obtained data,the total carbon emissions generated during the construction of the abandoned mine ecological restoration mine in Shikou Village Quarry in Sanwan Township were 355.67 t,most of which came from the energy consumption of mechanical construction of the abandoned mine slope treatment project,accounting for 95.53%of the total project carbon emissions.And the carbon emissions generated by diesel consumption account for the highest proportion of the total carbon emissions generated by all energy material consumption,accounting for 57.77% of the total carbon emissions of engineering projects,followed by gasoline.The carbon storage increase in the project area is 377.49 t,which can offset the carbon emissions generated by the remediation measures,of which the most effective increase in sequestration comes from the increase in soil carbon storage by 219.90 t,followed by vegetation restoration,which is one of the most effective ways to increase carbon sink in mine remediation,and the vegetation carbon storage increases by 157.59 t of carbon dioxide(4)The carbon effect between different restoration technologies was quite different,the two regreening technologies used in the ecological restoration of abandoned mines in Shikou Village quarry in Sanwan Township,planting substrate slope spraying technology and hydraulic spraying technology,the vegetation used in hydraulic spraying was divided into Bermudagrass & ryegrass and multi-grass mixed seeding,and the test and accounting results show that the area using planting substrate slope spraying technology was higher than that of hydraulic spraying technology in terms of soil carbon storage and vegetation carbon storage.The carbon storage of mixed grass seeds in the hydrospraying area was also higher than that of hydrospraying using only dogtooth root and ryegrass.There are differences in carbon sequestration effects among different vegetation species during the restoration process of the Shikou Village quarry in Sanwan Township,with Rhus chinensis > Chinese privet > purple-panicled acacia > Chinese toon > herbaceous plants.From the topography and surrounding environment of the project area,with the increase of slope height,the soil carbon content generally showed an increasing trend,and the soil carbon content in the project area close to the natural environment was relatively higher,while the soil carbon content near the road near the entrance of the project area and the middle platform area of the project area was low.In analyzing the relationship between the basic physicochemical properties of soil and soil carbon storage,it was also found that the C/N and available phosphorus content of soil had a significant impact on the change of soil total carbon content in this project.Changes in soil carbon storage were also positively correlated with changes in herbaceous carbon storage. |
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