广西沙塘林场马尾松和杉木人工林的碳储量研究

【目的】量化广西沙塘林场马尾松(Pinus massoniana)和杉木（Cunninghamia lanceolata）人工林碳储量，为评价其碳汇功能和可持续经营提供依据。【方法】 在广西沙塘林场选择处于中龄和成熟期的马尾松和杉木人工林，设置样地测算乔木、林下植被和枯落物的生物量，按20 cm分层挖取样地0～60 cm土层土样，最后依据有关方程，计算马尾松和杉木中龄和成熟人工林生态系统的含碳率和碳储量。【结果】 马尾松、杉木人工林林下植被含碳率变化于40.06%～45.23%, 枯落物含碳率为40.79%～46.06%，0～60 cm土层含碳率变化于0.34%～1.26%。马尾松和杉木人工林生态系统平均碳储量分别为168.36和128.08 t/hm²，其乔木层的平均碳储量分别为106.33和54.8 t/hm²,分别占总碳储量的63.15%和42.79%；土壤平均碳储量分别为54.96和67.33 t/hm²，其分别占总碳储量的32.64%和52.57%；其林下植被和枯落物平均碳储量分别占总碳储量的1.28%，1.02%和2.93%，3.63%。【结论】 马尾松人工林总碳储量以成熟林显著高于中龄林，杉木则以中龄林略高于成熟林；土壤和乔木层碳储量是马尾松和杉木人工林生态系统碳储量的主体部分,而林下植被和枯落物对碳储量的贡献较小。

Study on carbon storage of Pinus massoniana,Cunninghamia lanceolata plantations at Shatang,Guangxi Province

【Objective】 The carbon storage of Pinus massoniana and Cunninghamia lanceolata plantation in Guangxi Shatang Forest Farm were estimated,which can offer a basic reference for evaluating forest carbon sequestration and forest sustainable management.【Method】 Based on aboveground,soil sample plots,and biomass regression equation,the biomass,carbon content,storage in middle-aged and mature forests of P.massoniana and C.lanceolata plantation ecosystems were quantified.【Result】 The results show that the carbon content(percent of dry weight) of the understory layer in all plantations at middle-aged and mature age ranged from 40.06%-45.23%,while the content in the litter ranged from 40.79%-46.06%,the carbon content of soil from 0-60 cm depth ranged from 0.34%-1.26%.The total carbon storage of P.massoniana,C.lanceolata plantations was 168.36 and 128.08 t/hm2 respectively,the carbon storage of tree layer of P.massoniana,C.lanceolata plantations accounted for 63.15% and 42.79% of the entire stored carbon within each of the respective ecosystems;The carbon stored in the soil of P.massoniana,C.lanceolata plantations within the 0-60 cm depth was 54.96 and 67.33 t/hm2 respectively,accounting for 32.64% and 52.57% of the entire carbon stored within each of the respective ecosystems;The carbon storage percentage of understory and litter ranged from 1.02%-3.63%.【Conclusion】 For the total carbon storage,mature P.massoniana plantation ecosystem was significantly higher than its middle-aged forest,while middle-aged C.lanceolata plantation ecosystem was slightly higher than its mature forest.The carbon stored in the tree layer and soil combined accounted for the majority of the carbon stored within these plantation systems,whereas the carbon stored in the understory and litter contributed the less to the total carbon stock.