杉木人工林生物量及其分配的动态变化

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工林的生物量,并分析了其组成、分配特征及不同林龄生物量的变化趋势。结果表明: 林分 总生物量除 16 ~ 23 年生因间伐略有下降外均随林龄而增加,6、16、23、32 和 50 年生杉木人 工林生物量分别 为 62. 73、172. 51、141. 65、192. 30、247. 32 Mg · hm-2 ,其 中 活 体 植 物 占 95. 76% ~ 98. 39% ; 层次分配方面乔木层占绝对优势,为 89. 77% ~ 96. 55% ,其随林龄的变
俞月凤等: 杉木人工林生物量及其分配的动态变化
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lyzed. Except that the stands of 16 and 23 years old had a slight decrease in biomass due to intermediated thinning,the total biomass of the other stands increased with stand age. The biomass of the stands of 6,16,23,32,and 50 years old was 62. 73,172. 51,141. 65,192. 30,and 247. 32 Mg·hm-2 ,respectively,of which,living biomass made up 95. 76% -98. 39% . Tree layer predominated in biomass,occupying 89. 77% - 96. 55% of the total biomass,and the change trend of tree layer biomass with stand age was as the same as that of the total biomass. The biomass of litter layer was the second,occupying 1. 61% - 4. 24% ; while the biomass of shrub and herb layers was the least,accounting for 0. 01% -4. 26% and 0. 27% -4. 07% ,respectively. The biomass in shrub layer was the largest in 6 years old stand,while that in herb layer was the largest in 23 years old stand. In tree layer,trunk had the greatest proportion of biomass, accounting for 54. 89% -75. 97% ,followed by root,accounting for 11. 91% -12. 66% . The biomass of both trunk and root was increased with stand age. The proportion of branch- and leaf biomass was 11. 86 - 15. 19% ,and 4. 80% - 13. 17% ,respectively,and decreased with stand age. In shrub layer,the biomass allocation was in the order of branch > root > leaf,except for leaf > branch in 50 years old stand,and root > branch in 23 and 50 years old stands. In herb layer,as compared with underground part,aboveground part had greater biomass in 6 and 23 years old stands,but was the opposite in other age stands. The biomass of tree organs and in different layers as well as the whole biomass could be well fitted by growth models. As compared with other plantations,32 years old C. lanceolata plantation had a medium-high level total biomass,suggesting that C. lanceolata would be a fast-growing and high-yielding forestation tree species with high photosynthetic efficiency and high carbon sequestration potential.
序为枝>根>叶; 草本层分配以 6 和 23 年生杉木人工林地上相对生物量最大,其他林龄相 反; 杉木人工林乔木层各器官、各层次及总生物量具有良好的优化增长模型,其 32 年生人
工林总生物量与其他森林类型相比,处于中上等,是一个光合效率高、固碳潜力大的速生丰 产优良造林树种。
关键词 生物量; 林龄; 回归模型; 杉木人工林; 广西
中图分类号 S718. 55 文献标识码 A 文章编号 1000-4890( 2013) 7-1660-07
Dynamic changes of biomass and its allocation in Cunninghamia lanceolata plantations of different stand ages. YU Yue-feng1,2,3 ,SONG Tong-qing1,2** ,ZENG Fu-ping1,2 ,PENG Wanxia1,2 ,WEN Yuan-guang4 ,HUANG Cheng-biao4 ,WU Qing-biao4 ,ZENG Zhao-xia1,2 ,YU Yang1,2,3 ( 1 Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China; 2 Huanjiang Observation and Research Station of Karst Ecosystem,Chinese Academy of Sciences,Huanjiang 547100, Guangxi,China; 3 University of Chinese Academy of Sciences,Beijing 100049,China; 4 Forestry College of Guangxi University,Nanning 530004,Guangxi,China) . Chinese Journal of Ecology, 2013,32( 7) : 1660-1666. Abstract: Based on the investigation data from a total of 15 plots ( 20 m ×50 m) in Cunninghamia lanceolata plantations of different stand ages ( 6,16,23,32,and 50 years old) in Guangxi of South China,and by using the data of 15 sample trees of different ages and diameter at breast height ( DBH) ,the biomass regression equation with DBH as the single variable was established. The biomass in the tree layer and in the shrub,herb,and litter layers of the plantations was calculated by regression analysis and quadrat harvest method,respectively,and the change trends of the biomass and its allocation in the plantations of different stand ages were ana-
化与总生物量一致,其次为地上凋落物,占 1. 61% ~ 4. 24% ,灌木层和草本层生物量较小, 分别占 0. 01% ~ 4. 26% 和 0. 27% ~ 4. 07% ,分别以 6 和 23 年生最大; 乔木层器官分配以干
所占比例最高,占 54. 89% ~ 75. 97% ,根占 11. 91% ~ 12. 66% ,均随林龄而增加,枝、叶分别 占 11. 86% ~ 15. 19% 和 4. 80% ~ 13. 17% ,均随林龄而下降; 灌木层器官分配除 50 年生杉 木人工林枝相对生物量小于叶,23 和 50 年生杉木人工林根相对生物量大于枝外,其大小顺
* 中国科学院战略性先导科技专项( Байду номын сангаасDA05050205,XDA05070404) 、中国科学院西部行动计划项目( KZCX2-XB3-10) 、国家科技支撑计划项目 ( 2011BAC09B02) 、国家自然科学基金项目( 31070425,31000224,U1033004,31100329) 、广西科学研究与技术开发计划项目( 桂科攻 11230019C) 和广西特聘专家项目资助。 **通讯作者 E-mail: songtongq@ 163. com 收稿日期: 2013-01-16 接受日期: 2013-03-21
生态学杂志 Chinese Journal of Ecology 2013,32( 7) : 1660-1666
杉木人工林生物量及其分配的动态变化*
俞月 凤1,2,3 宋 同 清1,2** 曾 馥 平1,2 彭 晚 霞1,2 温 远 光4 黄 承 标4 吴 庆 标4
曾昭霞1,2
于 扬1,2,3
( 1 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,长沙 410125; 2 中国科学院环江喀斯特生态系统观
Key words: biomass; stand age; regression model; Cunninghamia lanceolata; Guangxi.
森林生态系统是世界上除海洋之外最大的碳库, 其碳储量约为 1146 Pg C,占全球总碳储量的 46% ( Watson,2000) ,森林植被部分维持着全球植被碳库 的 86% ,土壤碳贮量约占世界陆地土壤碳库的 73% ( Woodwell et al. ,1978) ,对全球碳平衡起着十分重要 的作用。森林生物量和生产力特征是森林生态系统 结构和功能的最基本特征之一,生态系统的能量和营 养循环研究首先依赖于生物量和生产力的数据。森 林的生物量积累和生产力发展是生态系统发展的根 本动力,森林生物量和生产力的动态决定着森林生态 系统的动态,对森林生物量的研究,不仅是合理开发 利用森林资源的需要,而且也是研究森林生态系统物 质与能量流动规律的重要基础( 刘世荣和温远光, 2005) 。因森林生物量估算的误差或不足造成了森林 生态系统向大气中的碳排放仍然是个很不确定的数 字( Schimel,1995) ,获得更为准确的森林生物量数据 是研究森林生态系统结构与功能的基础,对深入研究 森林生态系统生物地球化学循环、碳汇功能、评价人 工林生态系统生产力与环境因子之间的关系具有重 要的科学价值( Garkoti,2008) 。
测研究站,广西环江 547100; 3 中国科学院大学,北京 100049; 4 广西大学林学院,南宁 530004)
摘 要 根据 5 个年龄( 6、16、23、32 和 50 年生) 共 15 块 1000 m2 样地的调查资料,利用 15 株不同年龄和径阶的杉木样木数据,建立以胸径( D) 为单变量的生物量回归方程。采用样 木回归分析法( 乔木层) 和样方收获法( 灌木层、草本层、地上凋落物) 获取不同林龄杉木人
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