北京市油松林碳储量密度控制图研制及应用

Development and Application of Carbon Stock Density Management Diagram of Pinus tabuliformis Forest in Beijing

为了提升北京市油松林经营质量,实现林分密度调控精准化和数量化,本研究以北京市油松林为研究对象,基于北京市国家森林资源连续清查(一类清查)数据,以Reineke自然稀疏模型为基础,基于最优密度上下限及自然稀疏线、林分蓄积等值线、林分优势高等值线和林分碳储量等值线,构建北京市油松林碳储量密度控制图。根据密度控制图和林分实际情况,模拟林分自然稀疏、合理抚育间伐和对照抚育间伐(重度疏伐)3种抚育间伐措施下的林分碳储量,发现在科学密度下经营比自然稀疏或者无规则经营的碳储量高,合理抚育间伐时的碳储量增长是自然稀疏和重度间伐的1倍多;林分总收获量的增长也明显高于自然稀疏和重度疏伐。应用林分密度控制图可直观地展示不同经营情景下碳储量、蓄积量的变化,将不同经营目标下抚育间伐的时间、采伐木株树、采伐木蓄积量及碳储量等信息数量化,为以碳汇提升为目标的量化经营措施制定提供决策依据,有助于森林质量精准提升,实现森林经营的精细化和差异化管理。

In order to improve the management quality of Pinus tabuliformis forest occurring in Beijing and realize the precision and quantification of stand density regulation,this study constructed the carbon storage density control map of the P.tabuliformis forest in Beijing.Taking the P.tabuliformis forest in Beijing as the research object,based on the data of national continuous forest inventory in Beijing and Reineke natural sparse model,the control chart of carbon storage density of P.tabuliformis forest in Beijing was constructed on the bases of the upper and lower limits of optimal density,natural sparse line,stand volume isoline,stand dominant high isoline and stand carbon storage isoline.According to the density control chart and the actual situation of the stand,the carbon storages of the stand under the three tending thinning measures of natural thinning,reasonable tending thinning and control tending thinning(severe thinning)were simulated.The carbon storage under the scientifically reasonable density was higher than those of natural thinning or irregular management.The increase of carbon storage in reasonable tending thinning was doubled that of natural thinning and heavy thinning.The growth of total stand yield under scientifically reasonable density management was also significantly higher than those under natural thinning and heavy thinning.The application of stand density control chart can intuitively show the changes of carbon storage and volume under different management scenarios.Under different management objectives,the information of thinning time,logging tree,logging volume and carbon storage can be quantified,which provides a decision-making basis for the formulation of quantitative management measures with the goal of improving carbon sink.It is in line with the precise improvement of forest quality and realizes the fine and differentiated management of forest management.