The Research Of Carbon\Carbon Sinks Changes In Central Henan Urban Agglomeration Based On Remote Sensing

Carbon is an important part of nature, in the terrestrial ecosystems which has the most closerelationship with the human, it take up a great proportion, it play important role in the global carbon cycleand the changes in the concentration of carbon dioxide, the greenhouse gases, mainly the carbon dioxidehas an great impact on global temperature change, thus is important for the research on global climatechange. The most impact of human activity on global carbon emissions is the burning of fossil fuels,followed by the impact on the land use cover change, whose impact on carbon stocks accounted for half ofthe combustion of that of the fossil fuels. The combination of3S (RS, GIS, GPS) technologies can moreeasily and quickly get access to the information of regional land use changes, which, in conjunction withother economic and social statistics, can be used for the further study of temporal and spatial variations ofthe carbon source carbon sinks. Based on the interpretation of the two TM image of the central urbanagglomeration in2000and2010, this article analized the temporal and spatial variation of central urbanagglomeration carbon source carbon sinks, and discussed the driving mechanisms, by analyzing the data oftwo type of land of the various cities in the central area, the statistics data of the energy, socio-economicdata, and the carbon/carbon absorption coefficient of a variety of land types, using "3S" technology andrelated methods, spatial statistics and spatial analysis, mass balance model and method, in order to providetheoretical and technical basis for the regulation of carbon emissions and low-carbon development of thecentral urban agglomeration. Through study, we found:(1) Due to the rapid development of urbanization,the land structure of the central urban agglomerationchanged greatly. Overall, the rapid growth of construction land, agricultural land decreased at a faster rate.According to the result of de-interpretation of remote sensing images, the construction land growth from10254.129km2in2000to12947.775square kilometers in2010, which increased2693.645squarekilometers, totally increased26.27%, the average annual growth rate is2.63%, the proportion of the totalarea increased from17.6%in2000to2010, totally increased22.0%. The most reduction of arable land,reduce from34990.339km2in2000to31977.697km2, reduced3012.642km2. The proportion of arableland area decreased from60.3%to55%in2010. The woodland increased slightly to12,571.059km2from11998.126km2in2000, increased572.933km2, the proportion of forest land area increased by21%to 21.5%in2010. Construction land is the main direction of outflow of arable land, accounting for35.28%ofthe arable land outflow. The characteristics of the land usage changes of tcentral China city group in thedecade are large number of construction land expansion, and large number of occupation of cultivated land.Different citis has different changes as land usage change has strong correlation with the changes of thelocal region’s population, economic development, policy and other factors, the building land and farmlandof Zhengzhou and its counties decreased faster.(2) carbon sinks and their spatial distribution of the central urban agglomeration can be estimated fromthe land usage,. Judging from the central urban land types, the construction land and arable land are themain carbon source, woodlands are a major carbon sink. Construction land is the main carbon source, thecarbon emissions of the construction land of2000central China cities is40.9866million tons, carbonemissions from arable land is1.4853million tons, woodland is the main carbon sinks, absorbed a total of70.3744million tons carbon, which is27.9025million tons more than carbon source, from land-useperspective, in2000the central urban agglomeration is carbon surplus areas.2010construction land carbonemissions is101.1178million tons, carbon emissions from arable land is1.3432million tons, woodlandcarbon sequestration is71.8812million tons，in the study area the carbon source is30.5798million tonsmore than carbon sinks, in2010central China city group is in the carbon deficit state. In the10years from2000to2010, the central urban agglomeration land carbon emissions almost tripled, the land usagechanged from carbon gains to carbon loss, which implicated that carbon sinks is not sufficient tocompensate for the carbon emissions. The rapid development of the economy and the rapid advance ofurbanization is the cause of the sharp increase in the central urban agglomeration carbon source.(3) Central urban agglomeration carbon source/carbon sink space distribution and variation can beexplained by the amount and strength of them (ie per unit area of the carbon source/carbon sinks). From thetotal amount between2000and2010, the central urban agglomeration core area a represented byZhengzhou is the main distribution area of the carbon source, followed by Luoyang, Pingdingshan, Jiaozuocarbon source region, which is related to the regional economic development level and area factors;Luoyang, Pingdingshan are also the carbon sinks regions, which is related to the regional land usage. Thecarbon sink strength of those regions can more precisely indicate the carbon source/carbon sinks spatialdistribution and its changes, from the carbon source and carbon sink strength, the municipal districts of the city is the most concentrated areas of the carbon source, followed by Gongyi City, Xinmi City, county-levelcity of Yanshi City, whereas the carbon source strength of the surrounding counties are relatively small,which is closely related to the level of economic development of the region. Song County, Luanchuan,Luoning County, Huixian, Jiyuan City, Weihui City, and other surrounding counties (cities) have the geatestcarbon sink strength level, which is related to the higher proportion of woodland area. From the changes inthe distribution point of view, from2000-2010, the carbon source of Zhengzhou City increased most,followed by Luoyang and Pingdingshan City; the the carbon sink increased in some areas, and reduce insome areas. The increased area inludes Luoyang, Jiyuan, Jiaozuo, Xinxiang, and reduced area includeZhengzhou, Pingdingshan, which is related to the regional economic development speed. From the changesin carbon surplus carbon loss, Xinxiang, Pingdingshan changed from carbon gains to carbon loss, themargin between carbon sinks and carbon sources changed most in Zhengzhou and Luoyang, whereaschanged least in Kaifeng, Luohe, Xuchang, Jiyuan.(4) As to the carbon deficit problem of the central urban agglomeration, we need to develop a carbonsource/carbon sinks regulation strategy from two aspects including carbon emission reduction and carbonsink increase. Land for construction emitted much more carbon than the that of arable land, firstly we needto control the scale of construction land, secondly improve energy efficiency and reduce carbon sourcestrength; finally, continue to improve the energy structure and reduce the proportion of carbon-based energy.Planning the land usage scientifically, saving the land for construction, and appropriately increasing thecarbon sink area.