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根据宁夏回族自治区森林资源清查资料以及野外调查和室内分析的结果,研究了宁夏地区森林生态系统固碳现状,估算了该区森林生态系统的碳密度、碳储量,并分析了其空间分布特征.结果表明:宁夏森林各植被层生物量大小顺序为:乔木层(46.64 Mg·hm-2)>凋落物层(7.34 Mg·hm-2)>细根层(6.67 Mg·hm-2)>灌草层(0.73 Mg·hm-2).云杉类(115.43 Mg·hm-2)和油松(94.55 Mg·hm-2)的单位面积植被生物量高于其他树种.不同林龄乔木层碳密度中,过熟林最高,但由于幼龄林面积所占比例最大,其乔木层碳储量(1.90Tg C)最大.宁夏地区森林生态系统平均碳密度为265.74 Mg C·hm-2,碳储量为43.54 Tg C,其中,植被层平均碳密度为27.24 Mg C·hm-2、碳储量为4.46 Tg C,土壤层碳储量是植被层的8.76倍.宁夏地区的森林碳储量整体呈南高北低分布,总量较低.这与其森林面积小和林龄结构低龄化有很大关系.随着林龄结构的改善和林业生态工程的进一步实施,宁夏森林生态系统将发挥巨大的固碳潜力.
According to the forest inventory data of Ningxia Hui Autonomous Region and the results of field investigation and laboratory analysis, the carbon sequestration status of forest ecosystem in Ningxia was studied. The carbon density and carbon storage of forest ecosystem in this area were estimated and their spatial distribution characteristics were analyzed. The results showed that the order of the biomass of the vegetation layers in the forests of Ningxia was: 46.64 Mg · hm-2 in arbor layer, 7.34 Mg · hm-2 in litter layer, 6.67 Mg · hm-2 in root layer, The vegetation biomass per unit area of grass layer (0.73 Mg · hm-2), spruce (115.43 Mg · hm-2) and Pinus tabulaeformis (94.55 Mg · hm-2) was higher than that of other species. The density of over-mature forest was the highest, but it was the largest in the tree layer (1.90Tg C) due to the largest proportion of young forest area. The average carbon density of forest ecosystem in Ningxia was 265.74 Mg C · hm-2, Is 43.54 Tg C, in which the average carbon density of vegetation layer is 27.24 Mg C · hm-2, the carbon storage is 4.46 Tg C, and the soil carbon storage is 8.76 times of that of vegetation layer.The forest carbon storage in Ningxia is overall south high north Low distribution and low total amount, which is closely related to the small area of forest and the younger age of forest age structure.With the change of age structure And further implementation of forestry ecological engineering, Ningxia forest ecosystems will play a huge potential for carbon sequestration.