论文部分内容阅读
在全球气候变化背景下,科学的经营管理是人工林碳汇提升的主要途径。合理轮伐期从一定程度上反映了人工林集约经营的理念,是实现森林结构调整的主要影响因素之一。杉木(Cunninghamia lanceolata)多代连栽出现立地生产力下降与轮伐期的选择密切相关,开展不同轮伐期对杉木人工林碳固存影响的研究,可为其可持续经营提供理论依据。通过设置不同年龄序列的杉木人工林野外观测样地,应用野外观测数据对FORECAST模型进行验证,在此基础上模拟不同轮伐期对其碳固存的影响。结果表明:(1)短轮伐期(15年)在150年间的总固碳量较高,但固碳持久性较低,每个轮伐期之间的固碳量下降幅度较大,是一种不可持续的经营模式。(2)正常轮伐期(25年)和长轮伐期(50年)的总固碳量低于短轮伐期,但长轮伐期固碳持久性更强,有利于维持每个轮伐期内固碳量的稳定。(3)在好的立地条件下(立地指数(SI)=27),轮伐期越短对地力消耗影响越大,为了碳固存的持久性,建议杉木人工林的生态轮伐期选择在25年以上。(4)应用FORECAST模型可以定量地评估人工林的固碳能力,且该固碳能力是基于不同经营管理措施下的可持续固碳能力。
Under the background of global climate change, scientific management is the main way to promote the carbon sink of plantations. The reasonable rotation period reflects the idea of intensive management of plantation to a certain extent and is one of the main factors that affect the adjustment of forest structure. Cunninghamia lanceolata is closely related to the reduction of productivity and the choice of rotation period. The study on the impact of Cunninghamia lanceolata on the carbon sequestration of Cunninghamia lanceolata plantation can provide a theoretical basis for its sustainable management. By setting up field observation plots of Chinese fir plantations with different ages, the FORECAST model was verified by using field observations, and the effects of different rotation periods on carbon sequestration were simulated. The results showed that: (1) The total carbon sequestration in the short rotation (15 years) was higher than that in the 150 years, but the persistence of carbon sequestration was lower, and the carbon sequestration decreased more during each rotation, which was An unsustainable business model. (2) The total carbon sequestration during the normal rotation (25 years) and the long rotation (50 years) is lower than the short rotation, but the longer carbon sequestration persistence is stronger, Stable carbon content during the cutting period. (3) Under the condition of good site (SI = 27), the shorter the rotation period, the greater the impact on the soil erosion. In order to persist the carbon sequestration, it is suggested that the ecological rotation period of Chinese fir plantation should be at 25 years or more. (4) The FORECAST model can quantitatively evaluate the carbon fixation capacity of plantations, and the carbon sequestration capacity is based on the sustainable carbon sequestration capacity under different management measures.