模拟不同初植密度杉木楠木混交林对碳储量的影响

Effects of Simulation of Various Initial Planting Densities of Chinese fir with Phoebe bournei Mixed Forest on Its Carbon Storage

【目的】探索楠木×杉木混交林可持续性经营策略,并且为我国森林碳汇的估算提供参考和依据。【方法】以中亚热带楠木×杉木混交林为研究对象,采用标准地调查法获取相应数据,应用FORECAST混合型模型,模拟不同立地条件和初植密度下(4000,3000,2500,2000,1600株/hm^2)楠木×杉木混交林在未来300年(6个轮伐期)碳储量的时空变化。【结果】在300年的模拟时间里,不同初植密度多代连栽的楠木×杉木混交林在好、中、差3种立地条件下,碳储总量、土壤碳储量、生态系统碳储量以及年均固碳量都有较大的差异,表现为较好立地条件>中等立地条件>较差立地条件。并且楠木×杉木混交林随着连栽次数的增加碳储总量、土壤碳储量、生态系统碳储量以及净生产力都呈现上升趋势。【结论】在较好立地条件下,初植密度为2500株/hm^2的楠木杉木人工混交林在300年间所积累的碳储量及年均净生产力最高。中等立地条件下楠木×杉木混交林的初植密度控制在2500~3000株/hm^2,能够获得最大碳储量;在较差立地条件下,初植密度为4000株/hm^2的林分在300年间所积累的碳储量最高。

【Objective】This paper aimed to the exploration of Chinese fir with Phoebe bournei mixed forest sustainable management strategies and provided a reference and basis for the estimation of forest carbon sequestration in China.【Method】Taking Chinese fir with Phoebe bournei mixed forest as the research object,the standard survey method was used to obtain the corresponding data,with FORECAST mixed model,the temporal and spatial variation of carbon storage in the future 300 years(six rotation period)of Chinese fir with Phoebe bournei mixed forest under different site quality different initial planting densities(4000,3000,2500,2000,1600 N/hm 2)were simulated.【Result】In 300 years simulation,different initial planting density of successive planting trees in mixed forest of Chinese fir with Phoebe bournei in rich,medium and poor three site conditions,the total carbon storage,carbon storage,soil carbon storage of ecosystem and the average annual amount of carbon sequestration are different,expressed as rich site conditions>medium site conditions>poor site conditions.With the rotations of continuous planting increasing,total carbon storage,the soil organic carbon storage,the ecosystem carbon storage and NPP showed a marked ascending trend.【Conclusion】In the rich site conditions,the initial planting density of 2500 N/hm 2 in 300 years of accumulated carbon reserves and NPP was the highest.In the medium site conditions,the initial planting densities control between 2500 and 3000 N/hm 2,Maximum carbon storage.In the poor site conditions,the initial planting density of 4000 N/hm 2 in 300 years of accumulated carbon reserves was the highest.