Spatial And Temporal Associations Between Green Space Carbon Storage And Landscape Ecological Risks In Heilongjiang

Engineering practice activities such as greening configuration and ecological restoration of the country always trigger drastic changes in the carbon stock and ecological risk of the ecosystem.Green space,as a terrestrial natural resource element in the land space,is an important vehicle for carbon sink function and ecological resilience enhancement.However,the relationship between carbon stock and ecological risk in green space is still unclear,and it is significant to clarify the correlation characteristics between variables in the planning and ecological decision making of green space system in national land space.As an ecological barrier to maintaining national security,Heilongjiang Province has vast green space resources such as forests,grasslands,arable lands and wetlands.Based on the background of the preparation of territorial spatial green space system planning,the land pattern of natural development and black land conservation and utilization scenarios in 2030 is predicted based on the theoretical and technical methods of landscape ecology,landscape gardening,geography,and other multidisciplinary disciplines,using the land cover,physical geography and socio-economic data of Heilongjiang Province in 2000,2010 and 2020 as the research basis.The spatial and temporal characteristics of the provincial green space from 2000to 2030 are identified and analyzed;secondly,the carbon stock and landscape ecological risk characteristics of the green space during the study period are quantitatively explored and spatially mapped;and thus,the two variables are analyzed from the perspective of coupling and coordination relationships and quantitative,spatial and temporal correlations,aiming to clarify the spatial and temporal correlations between the carbon stock and landscape ecological risk of the green space in Heilongjiang Province.Eventually,the control mechanism and action proposals for ecological planning of the green space of the national territory are proposed.The study shows that:(1)Cultivated land and forest land are the most dominant green space types in the province.The overall green space change trend during 2000-2020 is determined by the change in 2010-2020.By 2030,the green space evolution under the black land conservation and utilization scenario is much more drastic than the natural development scenario,and will mitigate the green space loss of 8492 km~2.(2)The provincial green space carbon storage in 2000,2010,and 2020 are 7907080387 t,7951929001 t,and 7663802521 t,respectively;by 2030,the carbon storage of green space under the black land conservation and utilization scenario will be reduced by 261.199×10~6t,and the loss is lower than that of the natural development scenario of 426.293×10~6t.Green space landscape ecological risk index continues to rise from 2000 to 2020;the black land conservation and utilization measures during the next 10a will reduce the overall landscape ecological risk level of green space on the basis of natural development but will intensify the degree of concentration in high-risk areas in northeast and southwest China.Green space exchange status determines the spatial pattern of carbon storage and landscape ecological risk change to a certain extent.(3)The area of the patch is the main factor for the increase of carbon stock in green space.There is a high level of coupling coordination between green space carbon stock and landscape ecological risk.The overall carbon storage in green space and the ecological risk of the landscape show a significant positive correlation function,that is,the increase of carbon storage should also focus on the increase of ecological risk;the overall carbon sequestration and ecological risk in green space and the exchange state both show a positive correlation function;There is a positive and negative correlation between the amount of carbon sequestered and the value of ecological risk change in the green space transformation state,and the expansion state is the most beneficial for carbon addition and security in the future;in the landscape remediation of green space,priority should be given to areas with carbon density greater than 150t/ha.In the overall carbon stock and landscape ecological risk correlation zoning,HH and LL zones are the significant types with the largest area,identifying Heihe and Jiamusi cities as advantageous areas for future green space exchange conversion for carbon sequestration benefits and risk management.(4)It is suggested to set four kinds of green space ecological planning level 1 zoning:bottom-line,auxiliary,core and key,and to carry out four types of intensity control:strict control,key prevention,emphasis on strengthening and prominent optimization respectively;it is suggested to carry out"total"quality improvement database construction for green space,and a total of A total of 17"incremental"tapping projects,11"stock"efficiency projects and 7"reduction"value preservation projects were initially screened and incorporated into the project database list of ecological planning.