Integrating within-crown variation in net photosynthesis in loblolly and slash pine families.
Integrating within-crown variation in net photosynthesis in loblolly and slash pine families.
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DOI：
10.1093/treephys/24.11.1209
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发表时间：
2004-11
期刊：
影响因子：
4
通讯作者：
R. Mcgarvey;T. Martin;T. White
中科院分区：
文献类型：
--
作者：
R. Mcgarvey;T. Martin;T. White
研究了火炬松（Pinus taeda L.）湿地松（Pinus elliottii var.湿地（elliottii Engelm.）在北方佛罗里达的两个地点：（1）量化的光饱和净光合作用（Amax）的变化与垂直冠的位置和叶龄;（2）量化的数量和叶面积的叶龄级的分布;（3）确定是否光合指数，从叶水平到整个冠Amax，与物种和家庭之间的生长差异。在这两个物种中，叶级Amax较高，最近形成的叶子都在同一年内（其中Amax在第三次冲洗平均10至30%，高于Amax在第一次冲洗）和年之间（其中Amax在当年的叶子平均20至40%，高于Amax在1岁的叶子）。当表示叶面积的基础上，Amax的当年叶是较高的湿地松比火炬松，但Amax的质量基础上表示的物种之间没有差异。火炬松有较高的全树叶面积比湿地松，而全树Amax没有物种之间的差异。当快速增长的家庭的平均值与缓慢增长的家庭的平均值进行比较，有没有差异，在叶水平的特点，而在全树水平，快速增长的家庭有较高的叶面积和全树Amax比缓慢增长的家庭在这两个物种。然而，当对个别生长快和生长慢的家庭进行比较时，结果就更不一样了。在这两个物种中，干体积生长与全树Amax强烈相关，与来自体积生长和树叶面积之间的关系的相关性的大部分强度。
We examined photosynthetic characteristics of two fast- and two slow-growing half-sib families of both loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii var. elliottii Engelm.) on two sites in northern Florida to: (1) quantify variation in light-saturated net photosynthesis (Amax) associated with vertical crown position and foliage age; (2) quantify the amount and distribution of leaf area by foliage age class; and (3) determine whether photosynthetic indices, ranging from leaf-level through whole-crown Amax, were related to growth differences among species and families. In both species, leaf-level Amax was higher in more recently formed foliage both within the same year (where Amax in the third flush averaged 10 to 30% higher than Amax in the first flush) and between years (where Amax in current-year foliage averaged 20 to 40% higher than Amax in 1-year-old foliage). When expressed on a leaf area basis, Amax of current-year foliage was higher in slash pine than in loblolly pine, but Amax expressed on a mass basis did not differ between species. Loblolly pine had higher whole-tree leaf area than slash pine, whereas whole-tree Amax did not differ between species. When the mean values for fast-growing families were compared with the mean values for slow-growing families, there were no differences in leaf-level characteristics, whereas at the whole-tree level, fast-growing families had higher leaf area and whole-tree Amax than slow-growing families in both species. When comparisons were made among the individual fast- and slow-growing families, however, results were more variable. In both species, stem volume growth was strongly correlated with whole-tree Amax, with most of the strength of the correlation deriving from the relationship between volume growth and tree leaf area.