Relationship between specific leaf area of aCryptomeria japonica foliage shoot segment and its diameter
Relationship between specific leaf area of aCryptomeria japonica foliage shoot segment and its diameter
复制标题
柳杉叶梢节比叶面积与其直径的关系
DOI：
10.1007/bf02348586
复制
发表时间：
1988
影响因子：
2
通讯作者：
K. Hozumi
中科院分区：
文献类型：
--
作者：
Masumi Katsuno;K. Hozumi
1987年8月，对柳杉（Cryptomeriajaponica）3株18个不同高度水平枝条的5cm左右枝条切段，研究了比叶面积（SLA）与枝条直径（x）的关系。根据叶面积与针叶长度的异速生长关系，将针叶面积之和的一半定义为一个茎段的叶面积（S）。用木质组织干重（Ww）和针叶干重（Wn）除以林段长度（L），得到林段的线密度分别为Ww/L、Wn/L和S/L。密度与toxby幂型方程相关，在所讨论的x范围内，S/L值在1.2 [cm 2 cm −1]附近趋于恒定，而Ww/LandWn/L值随x明显增加。平均针叶面积与针叶线密度之间的近似倒数关系支持S/L值与x无关的事实，SLA和SNA分别定义为S/（Ww+Wn）和S/Wn。由S/L和W_w/L_x和W_n/L_x的平均值预测的SLA_x关系与观测到的SLA随x的增加而降低的情况吻合得很好。SNA也随时间延长而降低。相似茎段间SLA和SNA的变异与其高度水平无系统相关。并提出了一个具有最大值x（Xmax）的经验公式，以描述SLA-x关系。
Dependency of specific leaf area (SLA) on shoot diameter (x) was studied forCryptomeria japonicafoliage shoot segments about 5 cm in length taken from 18 branches at different height levels on 3 trees in August 1987. The leaf area of a shoot segment (S) was defined as half the sum of the needle area (s) estimated by the allometric relationship betweensand needle length. The dry weight of woody tissue (Ww) and needles (Wn) of a segment and itsSwere divided by the segment length (L) to give linear densities asWw/L,Wn/LandS/L, respectively. The densities were related toxby power-form equations.S/Lvalues tended to be constant around 1.2 [cm2cm−1] within the discussed range ofx, whileWw/LandWn/Lvalues clearly increased withx. The approximately reciprocal relationship between average needle area (s) and linear density of the number of needles supported the fact thatS/Lvalues were roughly constant regardless ofx.SLAandSNAwere defined asS/(Ww+Wn) andS/Wn, respectively. TheSLA-xrelationship expected from the average value ofS/Land theWw/L-xand theWn/L-xrelationships was well fitted to the observed decrease inSLAwith increasingx. SNAalso decreased asxincreased. Variations inSLAandSNAamong the shoot segments with similarxwere not systematically related to their height levels. An empirical equation with a maximum value ofx (Xmax)was also proposed in order to formulate theSLA-xrelationship.