杉木人工林碳收获预估技术研究

从收获预估的角度确定森林碳收获大小与林分之间的关系,定义了碳收获和碳收获表的概念.采用二次正交旋转设计设置杉木(Cunninghamia lanceolata)人工林典型标准地,调查测定获取典型样地杉木人工林样木各器官碳含量及碳贮量基本数据,基于相对生长方程以单株胸径、树高、材积为自变量建立杉木人工林单木碳收获量模型,以林分平均胸径、平均树高、密度指数和蓄积量为自变量建立杉木人工林林分碳收获量模型并编制其可变密度碳收获量表.经检验,所建立杉木人工林单木各器官碳收获量模型和林分碳收获量模型预估精度均达95%以上,且模型充分考虑了单株材积和林分蓄积量对碳收获量的影响,具有较强的兼容性和可操作性,在森林碳汇估测中具有应用价值.将所建立杉木人工林碳收获量模型应用于杉木人工林单木碳收获量及林分碳收获量预估,实例计算表明其预估精度较高,单木碳收获模型的相对误差仅为4.70 %,说明所建立杉木人工林碳收获量模型可应用于福建省杉木人工林单木和林分碳储量估计,从而丰富了森林资源动态预测内容,并可为森林资源监测及其相关研究提供基础数据.

Estimating Technology of Carbon Harvest for Cunninghamia lanceolata Plantation

By defining the concepts of carbon harvest and carbon harvest table and then using the second orthogonal rotation design to set standards plots of Cunninghamia lanceolata plantation in Fujian Province and by investigating and then measuring the carbon contents in different parts of a sampling tree and carbon stocks in different forest stands in the representative Cunninghamia lanceolata plantation, carbon harvest model of individual tree based on the relative growth equation with the independent variables of DBH, tree height and wood volume and stand carbon harvest table of variable density with the independent variables of average DBH, average tree height, density index and stand volume were respectively established in Cunninghamia lanceolata plantation in order to reveal the relationships between forest carbon harvest and forest stand of plantation especially Cunninghamia lanceolata plantation in Fujian Province from the point of view of yield prediction. The estimating accuracies of the carbon harvest models and the stand carbon harvest tables in Cunninghamia lanceolata plantation were high, both of which were more than 95% upon testing. In addition, the influences of single wood volume and stand forest stock volume on carbon harvest were fully considered by the models and tables. There are good application values in forest carbon sink estimation as the models and tables have excellent compatibility and strong operability. When the established carbon harvest models and tables of Cunninghamia lanceolata plantation were applied to estimate carbon harvest of a single wood or a forest stand in a reality Cunninghamia lanceolata plantation, the results were perfect with high accuracy. Especially, the proportional error was only 4.70% in the carbon harvest model of a single wood which indicated that the carbon harvest models and stand carbon harvest tables established in the paper could be used to estimate carbon storage or stock of a single tree and a forest stand in a Cunninghamia lanceolata plantation in Fujian Province, which would enrich the content of dynamic prediction of forest resources, provide reference for the monitoring of forest resources in the province and accumulate basic data for other relevant researches.