Effects of thinning on the compound economic benefits of carbon and wood for planted Larix olgensis forests
[Objective]To quantify the comprehensive impact of different thinning strategies on the timber yield,carbon storage,and economic benefits in the composite management of Larix olgensis plantations.By comparing different management schemes,optimize forestry management to enhance its carbon sequestration function and timber production,thereby increasing the overall economic value of forest land.[Method]Taking the L.olgensis plantations in Maoershan Experimental Forest Farm as the subject,based on the CO2FIX model,and incorporating meteorological data,survey data,and literature data,this study explored the effects of different thinning schemes:composed of starting periods(11 years,13 years),intervals(5 years,8 years,and 10 years),and thinning intensities(10%,20%,and 30%)[i.e.,[starting period,interval,thinning intensity]]—on the timber yield,carbon storage,carbon flux,and economic benefits of Larix olgensis plantations.[Result](1)An earlier thinning starting period helped to increase the timber yield and carbon storage of stands,with stands starting at 11 years showing an approximate 6%and 2%increase in timber yield and carbon storage,respectively,compared to those starting at 13 years.Light thinning optimized carbon sequestration,while heavy thinning obtained economic benefits earlier,with stands under 10%thinning intensity showing about a 28.9%and 13.2%increase in timber yield and carbon storage,respectively,compared to those under 30%intensity;however,the economic benefits of stands under 30%intensity increased by 19.5%compared to those under 10%intensity.A short thinning interval(5 years)increased timber harvest,carbon sequestration capacity,and economic benefits by 10%,5.3%,and 1.4%,respectively,compared to a longer interval(10 years).(2)When carbon sequestration and timber were the management objectives,scheme A1[11 years,5 years,10%]performed the best,with timber volume,carbon storage,and economic benefits of 758.49 m3/hm2,124.28 Mg C/hm2,and 324 800 yuan,respectively;when aiming for composite management of carbon and timber,scheme D3[13 years,5 years,30%]performed best,with timber volume and carbon storage decreased by 187.8 m3/hm2 and 13.5 Mg/hm2,respectively,compared to scheme A1,but the economic benefit was higher by 96 200 yuan.(3)When prioritizing carbon sequestration and timber,the carbon storage of L.olgensis plantations was about 246.11 Mg/hm2,with 49%of the carbon entering the soil carbon pool and 51%going into timber processing.After one rotation period,42%of the carbon enters the atmosphere,20%was released by decomposition of forest products,31%remained in the timber product carbon pool,and 7%remained in the soil carbon pool.However,when aiming for composite management of carbon and timber,the carbon storage was about 246.21 Mg/hm2,with 49%of the carbon entering the soil carbon pool and 51%going into timber processing.After one rotation period,43%of the carbon entered the atmosphere,20%was released by decomposition of forest products,31%remained in the timber product carbon pool,and 6%remained in the soil carbon pool.[Conclusion]The study quantitatively analyzed the impact of different thinning strategies on the carbon sequestration,timber yield,and their economic benefits in L.olgensis plantations,demonstrating the importance of appropriately selecting and adjusting thinning strategies based on specific management objectives(carbon sequestration,timber yield,or a comprehensive economic benefit of both).
Larix olgensisCO2FIX modelthinning scenarioseconomic benefitscarbon sequestrationwood production
万方数据
维普
