| 摘要: |
| 【目的】对宜君县森林碳储量、碳密度及空间分布格局进行研究，为宜君县森林价值及服务功能估算等提供参考。【方法】以宜君县第7次二类森林资源清查资料为数据源，运用材积源生物量法和平均生物量法进行生物量估算，结合不同树种的分子式含碳率，进行宜君县森林碳储量和碳密度的估算，并结合GIS软件进行数据的空间分析，探讨碳储量和碳密度的空间分布格局。【结果】宜君县森林碳储量为1 093 721.91 t，森林平均碳密度为15.20 t/hm2，总体呈自西向东递减的趋势，西部碳储量和碳密度明显高于东部。林分和灌木碳储量占森林碳储量的94.97%，林分平均碳密度为18.42 t/hm2，天然林的碳密度均高于人工林。乡镇与国有林场森林在碳密度结构上存在差异性，国有林场森林碳密度呈自西向东递减的趋势，而乡镇森林碳密度呈自西南向东北递减的趋势。【结论】宜君县林分的碳密度低于陕西省林分的平均碳密度，也低于全国平均水平。 |
| 关键词: 陕西省宜君县 碳储量 碳密度 空间分布 |
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| 基金项目:国家自然科学基金项目（31160120） |
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| Carbon density and spatial distribution pattern of forests in Yijun County,Shaanxi Province |
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| Abstract: |
| 【Objective】The major goal of this research is to investigate the carbon storage and its spatial distribution pattern and determine the value and service function of forests in Yijun County.【Method】According to the data of 7th Second Class Forest Resource Investigation in Yijun County,volume source biomass method and average-biomass computing method were used to calculate the biomass.Combining with the carbon contents in molecular formulas of different trees,the carbon storage and average carbon density of forests were estimated as well.Furthermore,spatial distribution patterns of carbon storage and average carbon density were discussed based on spatial analysis using Geographical Information System GIS.【Result】The calculated carbon storage of forests in Yijun County was 1 093 721.91 t with an average carbon density of 15.20 thm2.The carbon storage in west part was the highest with a general decreasing trend from west to east.Carbon storage of forests and shrubs accounted for 94.97% of the total carbon storage.Average carbon density of standing forests was 18.42 t/hm2,as natural forests carbon density was higher than that of man-made forests.The spatial distribution of town forests and state forest farms were different.The density of carbon storage in state forest farms was decreasing from west to east while that of town forests was decreasing from southwest to northeast.【Conclusion】Standing forests density of Yijun County was lower than the average of Shaanxi Province,as well as the national average. |
| Key words: Yijun County,Shaanxi Province carbon storage carbon density spatial distribution pattern |
