Root-shoot allometry of tropical forest trees determined in a large-scale aeroponic system
Root-shoot allometry of tropical forest trees determined in a large-scale aeroponic system
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DOI：
10.1093/aob/mcs275
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发表时间：
2013-07-01
期刊：
影响因子：
4.2
通讯作者：
Gruenzweig, Jos M.
中科院分区：
文献类型：
--
作者：
Eshel, Amram;Gruenzweig, Jos M.
这项研究是一个多阶段项目的第一步，旨在确定热带树木器官之间的异速生长关系，以及树木各部分与环境之间的碳通量。需要关于冠层根相互关系的资料，以增进对地上和地下过程的了解，并建立区域和全球碳循环的模型。将确定不同植物部位大小之间的异速生长关系。本研究使用了两种热带森林树种：原产于南美洲和中美洲以及西非的快速生长树种Ceiba pentandra（木棉）和原产于中非和东非的生长较慢的树种Khaya anthecca（非洲桃花心木）。比较了大型气培系统和50 l土壤容器中12月龄幼树的生长和异速生长参数。在气培法中种植植物的主要优点是它们的根系在植物的整个生命周期中都是完全可接近的，并且可以完全恢复以便收获。在两种生长体系中，快速生长的五角草和生长较慢的花茶的茎和根大小都存在明显差异。仅气养树苗的根被恢复，其在不同直径级之间的分布符合文献预期的模式。两种体系中各树种幼树的茎、枝、叶异速生长参数相似。气培树木生长系统可用于确定这些树木的根和梢组分之间的基本异速生长关系，从而可用于研究树木的整个地上和地下部分的碳分配和通量。
This study is a first step in a multi-stage project aimed at determining allometric relationships among the tropical tree organs, and carbon fluxes between the various tree parts and their environment. Information on canopyroot interrelationships is needed to improve understanding of above- and below-ground processes and for modelling of the regional and global carbon cycle. Allometric relationships between the sizes of different plant parts will be determined.Two tropical forest species were used in this study: Ceiba pentandra (kapok), a fast-growing tree native to South and Central America and to Western Africa, and Khaya anthotheca (African mahogany), a slower-growing tree native to Central and Eastern Africa. Growth and allometric parameters of 12-month-old saplings grown in a large-scale aeroponic system and in 50-L soil containers were compared. The main advantage of growing plants in aeroponics is that their root systems are fully accessible throughout the plant life, and can be fully recovered for harvesting.The expected differences in shoot and root size between the fast-growing C. pentandra and the slower-growing K. anthotheca were evident in both growth systems. Roots were recovered from the aeroponically grown saplings only, and their distribution among various diameter classes followed the patterns expected from the literature. Stem, branch and leaf allometric parameters were similar for saplings of each species grown in the two systems.The aeroponic tree growth system can be utilized for determining the basic allometric relationships between root and shoot components of these trees, and hence can be used to study carbon allocation and fluxes ofwhole above- and below-ground tree parts.