Potential Carbon Sequestration And Benefit For Tending Chinese Fir In Zhejiang Province

Global warming has become the primary ecological problem.Concentrations of greenhouse gases such as CO2 in the atmosphere is the source of climate warming,countries around the world are actively responding to the issue of climate warming.Increasing carbon sinks through afforestation,reforestation and forest tending is an important way to slow climate warming.Chinese forest resources are mainly young and middle-aged forests.At present,the main difficulty is that the rearing work is lagging behind,which hinders the function of forest carbon sequestration.Zhejiang Province is a strong economic province and a large carbon emission province in China,taking it as the research object is practical significance.Taking the representative tree species--Chinese fir,as an example,based on the monitoring data of Chinese fir forest tending in Qingyuan Experimental Forest Farm,estimating the growth changes of Chinese fir forest after tending that under different site conditions.According to the "Methods of Forest Management Carbon Sink Project Methodology",the carbon sink increase after fir cultivation under different site conditions was calculated,and obtain the potential for raising and increasing sinks.Based on the 4.75%benchmark interest rate of the China People's Bank for medium and long-term loans,the NPC and IRR were used to analyze the economic benefits of the Chinese fir forest after cultivation.The period of Chinese fir tending project up to 20 years,therefore,a sensitivity analysis is made on the impact of carbon sink prices,timber prices,discount rates,and measurement monitoring costs on the project's net present value.research shows that the potential for tending and carbon sequestration of Chinese fir forest in superior and medium forest land in Zhejiang Province are 243256.10 tC02-e and 394876.73 tCO2-e,respectively.The NPV was RMB 37.75331 million and RMB 13.49167 million,and the IRR are 9.339%and 5.615%,which indicates that the effect of tending in superior and medium forest land is obvious;The potential of tending Chinese fir forest in inferior forest land is 61377.45 tCO2-e,the NPV is-939.238 million yuan,and the IRR is 2.262%,indicating that there is room for increasing carbon sequestration,but it is not economically feasible.The sensitivity of the NPV influencing factors is ranked as follows:timber price>discount rate>carbon sink price>measurement monitoring cost.Timber prices have the greatest impact,and it affected by both the market and the quality of the wood.Tending projects can cultivate large-diameter timber,thereby improving the quality of wood and the price of wood.The break-even points of the superior and middle forest land of the Chinese fir forest tending to the carbon sequestration Project are 511.84 hm2 and 3936.49 hm2,respectively.That is to say,it is economically effective to raise at least that area of the Chinese fir forest.The sensitivity of the factors affecting the break-even point is ranked as follows:timber price>discount rate>measurement monitoring cost>carbon sink price.Existing research is based on the consideration of comprehensive tending of all superior or middle forest land in Zhejiang Province,and the measurement monitoring cost per unit area is only 32.12 yuan/ha or 10.71 yuan/ha,so it shows the least impact.If we take into account the fact that Zhejiang Province is mainly based on farmer operation,and the average household area is less than 1 hectare,so the measurement monitoring cost per unit area will be as high as 600,000 yuan per hectare.As a result,it is not feasible to implement the project of tending project.