Abstract:
Abstract: Forestland use change will impact forest carbon sequestration. The carbon sequestration efficiency of forestland use can reflect the carbon sequestration effect of forestland use by input-output analysis, which can optimize the structure of forestland use and maximize its carbon sequestration value. In view of a regional perspective, in this paper we selected the C2R-I model based on data envelopment analysis (DEA), which adopts the different types of forestland use as the inputs and the total forest carbon sequestration as a final output. Combined with comprehensive historical statistics and field calibration, this paper analyzes the carbon sequestration efficiency of forestland use processes in the Hangzhou domain. The results are as follows: First, the development of carbon sequestration efficiency of forestland uses in the Hangzhou domain is uneven; there is a wide variation among different parts. Among the 8 urban counties in Hangzhou city, only Chunan county's carbon sequestration efficiency of forestland for DEA is always effective, but most of the county urban forestland uses exhibit a low carbon sequestration efficiency. There is a inversel relationship between the spatial distribution pattern of the carbon sequestration efficiency of forestland use process and the regional economic development level. Second, according to the "land use, land-use change, and forestry (LULUCF)" directory and the conversion rules of "complex system data envelopment analysis" (CSDEA), there are three important factors that affect the carbon sequestration efficiency optimization of regional forest land use structure: the volume of different forestland use types per unit area, the level of urbanization, and the forest naturalness status. This paper designed the input-output optimization model consisted of these three factors, and got the added amount of forest carbon sequestration after the forestland use processes optimization. The specific calculation results of the model show that Hangzhou city "afforestation and reforestation" optimization of investment can increase the volume by 3 279.68 m3/a; "forest management" optimization of investment can increase the volume by 29 871.23 m3/a; "forest harvesting" optimization of investment can increase the volume by 111 959.19 m3/a; and "forest carbon sequestration" output optimization can increase the carbon amount by 7.61 Tg/a. Third, in the optimal design, this paper assume no changes of forest resources and no progress of forest technology, because the relevant data can not be obtained in a short time, so the analysis process exhibits some defects that are difficult to overcome but that can be further improved in future research. However, the evaluation method provides a reference for carbon sequestration efficiency evaluation of forestland use process of the Hangzhou City domain, and the evaluation results provide a scientific basis for boosting low carbon development in different regions.