近20年海南岛森林生态系统碳储量变化
Changes in forest biomass carbon storage in Hainan Island over the last 20 years
查看参考文献40篇
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文摘
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热带森林在碳循环研究中有重要作用。根据目前森林碳储量的计算方法和海南森林资源二类调查数据，估算了不同时段的碳储量，并分析其动态变化特点。结果表明：海南森林碳储量从1979年的30.45TgC增加到1998年的37.74TgC，年均增加0.3645TgC，增长率为1.19%，是全国平均增长率的2.5倍；海南森林在碳循环中起不断增强的碳汇作用；森林碳密度呈加速减少趋势，储碳潜力将很大；随着海南全面禁止采伐和封育等林业措施的实施，森林面积扩大，林龄结构改善，储碳能力将进一步提高，海南森林在全国或全球碳循环中的作用和社会价值与意义将日渐突出。通过对碳储量计算不确定性的分析和讨论，提出应加强对森林群落各层次生物量的实测与实地监测研究，统一计算方法，以提高碳储量计算的精度。 |
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其他语种文摘
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Tropical forest plays an important role in global carbon cycle and carbon balance. What function the tropical forest is, carbon sink or carbon source, is still a disputed question among researchers. In this paper, we use an improved estimation method of forest biomass and forest resource inventory in Hainan Island to estimate carbon storage and its dynamic changes between 1979 and 1998. Here, the data of carbon storage includes three parts: carbon content in tree layer, carbon content in understorey, and carbon content in the litter layer. The results suggest that: 1) Carbon storage increased significantly in Hainan forest after 1979 from 30.45 TgC to 37.74 TgC by 1998, for the annual average accumulation amount of 0.3645 TgC, or the annual average accumulation rate of 1.197%, is much higher than that of the national level. The function of carbon sink in Hainan forest is becoming greater and greater. 2) The mean carbon density is 32.59 tC/hm~2 between 1979 and 1993. The carbon density reduced rapidly after 1979 from 38.63 tC/hm~2 to 24.41 tC/hm~2 by 1993. The value of carbon density varies with forest types and forest ages. Generally speaking, carbon density increases with forest ages. So carbon storage potential in Hainan forest will become much greater. 3) With the measures of forest protection such as forbidding cutting, enclosing land and planting trees carrying out, forest areas will expand and the structure of forest ages will change. All these will lead to the improvement of capability of carbon storage. At the condition that the global tropical forest plays a notable role of carbon source in carbon cycle, the function and social value of Hainan forest, a representative region of tropical forest in China, will become increasingly notable in the national and even global carbon cycle. There is great difference in carbon storage among different researchers. This paper also analyses and discusses the uncertainty in calculating carbon storage and points out that it is only by strengthening the study on forest community biomass in different layers and unifying and improving the methods of calculating carbon content, can the precision of carbon storage be improved. At the same time, we should verify data first before using them. |
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来源
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地理研究
,2002,21(5):551-560 【核心库】
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关键词
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海南岛
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碳储量
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碳密度
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碳汇
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地址
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中国科学院地理科学与资源研究所, 北京, 100101
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0585 |
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学科
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环境科学基础理论 |
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基金
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中国科学院重点项目
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中国科学院地理科学与资源研究所知识创新工程领域前沿项目
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文献收藏号
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CSCD:988030
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