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森林植被碳密度是衡量森林生态系统服务功能和产品供给功能高低的一个重要指标。本文以四川省石棉县为例,在森林资源二类调查数据的基础上,提出建立森林植被生物量、碳量及其密度GIS数据库,开展其碳密度分布知识发现的研究,从中发现了该县碳密度分布知识。该县有林地森林植被碳量达到364万t,冷杉、云杉、铁杉和桦木占总碳量的83%;有林地森林植被碳密度为40t/hm2,其云杉和冷杉分别为47t/hm2和43t/hm2;碳量随坡度等级的增加而增加,25°以上坡地的森林植被碳量占总碳量的91%;25°以上森林植被碳密度比25°以下森林植被的碳密度高。微度与中度土壤侵蚀下的森林植被碳密度较高,在42t/hm2以上;剧烈与极强侵蚀下的森林植被碳密度相对较低,为29t/hm2。森林植被碳密度与郁闭度之间在0.05的水平上显著相关。研究表明,该县冷杉与云杉林保护较好,25°以上区域的森林保护较好,因此,具有较高的森林植被碳密度。森林植被碳密度越高的区域,其水土侵蚀强度越低。该研究成果对加强该县森林资源的保护,特别是该县国家与省级自然保护区的保护建设具有重要意义。
The carbon density of forest vegetation is an important index to measure the function of forest ecosystem services and the function of product supply. This paper takes Shimian County in Sichuan Province as an example. Based on the data of the second type of forest resources survey, this paper proposes the establishment of a GIS database of biomass, carbon content and density of forest vegetation and its knowledge of carbon density distribution. From this discovery, Knowledge of carbon density distribution. There are 3.64 million tons of forest carbon in forests and 83% of the total carbon in fir, spruce, hemlock and birch in the county. The density of forest vegetation in the forest is 40t / hm2 and the spruce and fir are 47t / hm2 and 43t / hm2, respectively. The amount of carbon increased with the increase of grade, and the amount of carbon in forest vegetation on the slope above 25 ° accounted for 91% of the total carbon. The density of vegetation in forest vegetation above 25 ° was higher than that in the forest below 25 ° . Under the mild and moderate soil erosion, the vegetation carbon density is higher than 42t / hm2, and the vegetation density under the intense and extremely erosion is relatively low, 29t / hm2. There was a significant correlation between forest plant carbon density and canopy density at the level of 0.05. Studies have shown that the county fir and spruce forest protection is better, more than 25 ° of the forest protection is better, therefore, has a higher carbon density of forest vegetation. The higher the carbon density of forest vegetation, the lower the erosion intensity of water and soil. The results of this research are of great significance for strengthening the protection of forest resources in this county, especially for the protection and construction of national and provincial nature reserves in this county.