Sapling architecture and growth in the co-occurring species Castanopsis cuspidata and Quercus glauca in a secondary forest in western Japan
Sapling architecture and growth in the co-occurring species Castanopsis cuspidata and Quercus glauca in a secondary forest in western Japan
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DOI：
10.1007/s10310-004-0124-9
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发表时间：
2005-04-01
影响因子：
1.5
通讯作者：
Takeda, H
中科院分区：
文献类型：
--
作者：
Cho, M;Kawamura, K;Takeda, H
本研究定量比较了日本西部温带的两种主要树种--锥栗和青栎幼树在次生林遮荫光照条件下的构型和生长。在相同支撑体质量(树干+枝条质量)下比较幼树构型时，由于将更多的生物量分配给侧枝，华山杉的树冠面积较大，但树高增长较小。刺参(0.442 g g(-1)年(-1))的地上相对生长率(RGR)是青冈(0.256 g g(-1)年(-1))的近两倍，这主要是因为紫荆(56 cm(2)g(-1))的地上单位生物量的总叶面积(LAR)比青冈(33 cm(2)g(-1))大。由于其在高生长方面的劣势，与其生物量的分配模式有关，在生物量产量较大的情况下，它实现了与青冈相同的高生长(RGR)。尖顶红杉的光合作用潜力很大，这是它旺盛的横向扩展的结果，这被认为是它在阴暗的森林下层中相对于青冈具有长期优势。问：青冈优先投资于树干生物量，这可能会让它在阳光充足的地方获得优势，而不是在树荫下的森林中。
This study quantitatively compared the sapling (height 62-289cm) architecture and growth of Castanopsis cuspidata and Quercus glauca, both of which are major components in the temperate zone of western Japan, under shaded light conditions in secondary forest. When the sapling architectures were compared at the same support mass (trunk + branch mass), C. cuspidata had a larger crown area but a smaller height gain than did Q. glauca owing to the allocation of more biomass to lateral branches in C. cuspidata. The above-ground relative growth rate (RGR) of C. cuspidata (0.442 g g(-1) year(-1)) was nearly twice that of Q. glauca (0.256 g g(-1) year(-1)), primarily as a result of a greater total leaf area per above-ground biomass (LAR) in C. cuspidata (56 cm(2) g(-1)) as compared to Q. glauca (33 cm(2) g(-1)). Because it has a disadvantage in height gain, related to its allocation pattern of biomass, C cuspidata realized the same height growth (RGR,) as Q. glauca, despite the large biomass production. The great potential for photosynthesis in C cuspidata, which results from its vigorous lateral spreading, is presumed to give it a long-term advantage over Q. glauca in the shaded forest understory. Q. glauca invests preferentially in trunk biomass, possibly giving it an advantage in sunny sites as opposed to a shaded forest understory.