中国思茅松林资源动态研究
Dynamic Changes in Pinus kesiya var.langbianensis Forest Resources in China
查看参考文献21篇
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文摘
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利用从1987年以来的森林资源连续清查长期监测数据, 对我国思茅松林资源的数量、质量、结构、主导利用方向动态变化进行了分析研究. 结果表明, 从1987年-2007年, 思茅松林资源总体呈下降趋势, 面积从6 7.20×10~4hm~2下降到59.04×10~4hm~2, 年均递减0.61%; 蓄积量的变化幅度则相对较小. 20年间思茅松林平均单位面积蓄积量略有增长, 表明总体质量有所上升. 但与此同时, 径级结构动态变化显示, 思茅松林小径组、中径组林木蓄积量所占比重呈递增趋势, 而特大径组林木蓄积量则快速递减, 近、成、过熟林的单株材积在1987年-2007年间下降了38.24%, 单株立木材积显著下降, 表明可用资源质量正呈现出下降趋势, 材种结构朝低质化方向颓变, 反映出思茅松林在经营中忽视了高价值特大径级林木资源的培育. 思茅松人工林在监测期间有较大幅度增长, 但单位面积蓄积量显著低于同期相同龄组思茅松林的平均水平. 20年间, 思茅松林调整为公益林的面积呈上升趋势, 主导利用方向仍以商品林为主, 但对两类林调整过于随意, 不利于思茅松林的可持续经营 |
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其他语种文摘
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The forest of Pinus kesiya var.langbianensis is an important pine forest type distributed in the south of China, but its long-term changes have not been systematically studied yet. In order to improve the management of forests, coordinate the relationship between protection and utilization, and to provide a basis for decision-making for sustainable development of resources, the quantity, quality, structure, and changes in dominant utilization direction of Pinus kesiya var. langbianensis were analyzed in the present work using long-term monitoring data from the national continuous forest inventory during the period 1987-2007.All changes were monitored every 5 years within the past 20 years. Results showed that in general, the Pinus kesiya var.langbianensis forest showed a decreasing trend from 1987 to 2007.For instance, the area decreased from 672,000 hm2 to 590,400 hm~2, showing a mean annual decreasing rate of around 0.61%.The stock volume slightly increased, indicating slightly improved general quality of the forest. In the meantime, changes in the diameter structure revealed that the stock volume proportion of small and middle diameter groups tended to increase progressively, while that of the extra large diameter group decreased significantly. The individual timber volume of approach-mature, mature and over-mature forests decreased by 38.24%;meanwhile the individual standing volume also decreased greatly from 1987 to 2007.It was suggested that the available resource quality tended to decrease and the timber structure transferred from good quality to poor quality. The forest resources providing high-quality timber, especially extremely large-diameter timber, have not been received much attention during the past 20 years. Pinus kesiya var.langbianensis plantation greatly increased during the monitoring periods, but per unit area of the stock volume was found to be significantly lower than that of the average level of the same aged group. This reflected extensive plantation management and low productivity. Furthermore, the Pinus kesiya var.langbianensis forest was always managed in a timber-oriented way, resulting in heavy pressure on resource utilization during a long period. A large fluctuation of the proportion of commercial forests to non-commercial forests due to random readjustment seems to indicate an unbalanced relationship between reasonable utilization and protection. It was suggested that this kind of management strategy be detrimental to sustainable management of the Pinus kesiya var.langbianensis forest and thus need to be adjusted in future |
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来源
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资源科学
,2010,32(8):1621-1626 【核心库】
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关键词
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思茅松
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森林资源
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动态变化
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监测
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地址
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云南省林业调查规划院, 昆明, 650051
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中国林业科学研究院资源昆虫研究所, 昆明, 650224
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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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1007-7588 |
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学科
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能源与动力工程 |
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基金
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国家林业公益性行业科研专项
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云南省森林资源监测研究; 全国森林资源连续清查项目
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文献收藏号
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CSCD:3980111
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