高州油茶人工林碳储量分布特征

Carbon storage and distribution characteristics of Camellia gauchowensis plantation

【目的】探明高州油茶Camellia gauchowensi人工林碳储量及分布特征,并估算评价其固碳效应。【方法】根据样地植株径级分布特征,选取不同径级样株各2~3株,取树叶、树干、树枝、树根、果实、花芽各器官测定生物量和碳含量,并建立各器官生物量模型;在标准地内按“S”形选取8个样点,沿土壤剖面分层采集0~20、20~40、40~60和60~100 cm土层的土壤样品,测定土壤容重与碳含量,计算碳储量。【结果】高州油茶中龄林植株各器官生物量分配比例依次为树干>树根>树叶>树枝>果实>花芽,各器官生物量均随地径的增大而增大。试验林分总生物量为26.902 t·hm^-2,树体平均碳质量分数为483.45 g·kg^-1。同径级各器官的碳含量不同,其中,果实平均碳含量最高。林地100 cm深土层中,土壤碳含量随着土层深度的增加呈明显递减规律,其中,0~20 cm土层碳含量最高,碳质量分数为26.550 g·kg^-1。高州油茶林地总碳储量为144.538 t·hm^-2,其中,树体碳储量为12.857 t·hm^-2,占总碳储量的8.90%;林地土壤碳储量为131.681 t·hm^-2,占总碳储量的91.10%。根据中国生物多样性国情报告编写组数据,碳价格为260.90元·t^-1,则本试验高州油茶林的碳汇经济效益约为3.8万元·hm^-2。【结论】高州油茶林分碳储量高于广东省经济林平均碳储量,林地土壤碳储量高于广东省平均土壤碳储量,林分总碳储量高于珠三角森林生态系统碳储量,具有较高的生态效益。高州油茶不仅有较好的生产效益,而且具有十分广阔的固碳前景。

【Objective】To investigate carbon storage and distribution characteristics of Camellia gauchowensis plantation,estimate and evaluate the effect of carbon sequestration.【Method】Based on the distribution characteristics of basic diameter class in the sample plot,2 to 3 sample trees were selected in each diameter class.The biomass and carbon content of various organs(leaves,trunks,branches,roots,fruits and flower buds)were measured and their biomass models were established.According to“S”shape in standard plot,eight sampling points were randomly selected to collect soil samples from 0-20,20-40,40-60 and 60-100 cm along the soil profile.The bulk density and carbon content of soil samples were determined and the carbon storage was calculated.【Result】The order of biomass allocation ratio of the organs of middle-aged C.gauchowensis plantation was trunks>roots>leaves>branches>fruits>flower buds.All the biomass of various organs increased with the basal diameter.The total biomass of test stand was 26.902 t·hm^-2.The average carbon content of the tree was 483.45 g·kg^-1.The carbon contents were different from various organs in the same diameter class,with fruits being the highest.In the soil layers of 100 cm depth in C.gauchowensis forest land,the soil carbon content decreased with the increase of soil depth,with 0^-20 cm soil layer being the highest(26.550 g·kg^-1).The total carbon storage of C.gauchowensis plantation was 144.538 t·hm^-2,which was 12.857 t·hm^-2(accounting for 8.90%)and 131.681 t·hm^-2(accounting for 91.10%)for plant and soil,respectively.According to the authorized data of China biodiversity national condition report,the carbon price is 260.90 CNY per ton,so the economic benefit of the carbon of C.gauchowensi plantation is about 38000 CNY per hectare.【Conclusion】The carbon storage of C.gauchowensis plantation is higher than that of the average level of non-timber forests in Guangdong,the forest soil carbon storage is higher than the average level in Guangdong,and the total carbon storage of stand is higher than that of forest ecosystem in the Pearl River Delta.C.gauchowensi not only has a good production benefit,but also has a very broad prospect of carbon sequestration.