Dynamic Change Characteristics Of Land Use And Vegetation Carbon Storage In Daqing City

"Carbon neutrality"is a new challenge that the earth poses to people.Since the industrial revolution,human emissions of carbon resources have shown a geometric increase.Today,with the increasing carbon emissions,the environmental problems brought by it have become more and more serious.The average air temperature is rising year by year,and various natural disasters have occurred in various places.How to It is an issue that needs serious consideration at the moment to be able to protect the ecological environment while stably developing the economy.The total amount of carbon resources in the earth’s atmosphere has been maintained at a relatively stable level.The carbon content in the atmosphere is mainly determined by the emission of carbon resources and the fixed amount of carbon resources.Terrestrial ecosystems have a strong ability to store carbon resources.Among them,vegetation The ability to store carbon is even more critical,so it is necessary to understand how the carbon storage of vegetati on changes per unit time.Land use change has long been an important factor in the change of vegetation types.The transformation of a large amount of land from one type to another type will inevitably lead to changes in related vegetation,which in turn will affect the total carbon storage of vegetation in the region.Based on this,this paper takes Daqing City,Heilongjiang Province as the research area,adopts a combination of qualitative description and quantitative analysis,and uses GIS spatial analys is,land center of gravity transfer analysis,land transfer matrix and CASA model in technical methods.Six types of land use changes in 2010,the dynamic changes of vegetation carbon storage in the study area from 1990 to 2020,and the relationship between land use and vegetation carbon storage were studied in depth.The results of the study are as follows:First,judging from the remote sensing images of land use in the five periods from 1980 to2020 in the study area,the most important land type in Daqing in each period was cultivated land.From the change trend and transfer direction,the area of cultivated land increased by 894.93hm~2 in the past 40 years,most of the cultivated land was converted from grassland,and the trajectory of the center of gravity of cultivated land has been moving to the north,and the rapid growth of cultivated land is mainly affected by economic and agricultural factors.In the past 40 years,the grassland decreased most seriously,with a total reduction of 1948.73hm~2.The trajectory of the grass center of gravity first moved to the south and then to the north.The grassland became the type with the largest land use change due to unused land.The forest area has increased by 105.7%in the past 40 years,and the increase in forest land has witnessed Daqing City’s active response to the national call for afforestation,indicating that the policy of returning grassland and returning farmland to forest has played a guiding role.The area of construction land has increased by277.75hm~2.The center of construction land is concentrated in the south of Honggang District.The increase of construction land is reflected in urban expansion.The proportion of unused land has increased from 17.12%in 1980 to 23.55%in 2020.The center of gravity of unused land is concentrated in the northern part of Datong District.The increase in unused land reflects the ecological destruction of the study area.The area of the water area has decreased by 952.44hm~2,and the decrease of the area of water area is also due to the incomplete ecological protection.Therefore,it is imperative to strengthen the ecological environment protection in the study area.Second,the net primary productivity of vegetation in the study area obtained from the research results is in descending order of forest land>arable land>grassland>unutilized land>construction land>water area.It is the cultivated land that has increased the vegetation carbon storage in the study area over the past 30 years.,woodland,construction land,a nd unused land,grassland and water areas showed a decline in vegetation carbon storage.The carbon storage value in the study area increased from 30.57×10~5t in 1990 to 32.06×10~5t in 2020,a net increase of1.49×10~5t.The vegetation in the study area is a"carbon sink".Through observation,it can be known that cultivated land is a key factor affecting the vegetation carbon storage in the study area.Third,regional vegetation carbon storage can be adjusted by land area.From 2000 to 2010,vegetation carbon storage increased the most,thanks to the substantial increase in cultivated land and unused land.The total amount of regional vegetation carbon storage can be regulated by the area of different land types and the net primary productivity of vegetation.For the study area,the total carbon sequestration in the study area should be increased by reducing the unused land area and increasing the forest land with the largest NPP value.Finally,according to the above research results and the development charac teristics of the study area,suggestions are put forward that are conducive to the efficient and rational use of land in the study area and the increase of vegetation carbon storage in the study area.