Plant size effects on the relationships among specific leaf area, leaf nutrient content, and photosynthetic capacity in tropical woody species
Plant size effects on the relationships among specific leaf area, leaf nutrient content, and photosynthetic capacity in tropical woody species
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DOI：
10.1016/j.actao.2009.11.004
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发表时间：
2010-03-01
影响因子：
1.8
通讯作者：
Sun, Shucun
中科院分区：
文献类型：
--
作者：
Liu, Fude;Yang, Wenjie;Sun, Shucun
为了测试叶片性状关系是否随植株大小而变化，在中国的一个热带山地雨林中，对127株小型个体（木本植物，高度低于2米）和47株大树（高度高于10米）的比叶面积（SLA）、基于面积和质量的叶片养分含量（氮面积和氮质量、磷面积和磷质量）以及基于面积和质量的叶片光合能力（A(面积)和A(质量)）进行了测量。采用标准化主轴（SMA）方法对基于质量的性状关系进行尺度转换。我们发现小型个体的A(质量)、磷面积、磷质量和SLA高于大树，但A(面积)、氮面积和氮质量的变化趋于平稳。氮质量 - A(质量)、SLA - A(质量)和氮质量 - SLA这些性状对通常具有正相关的斜率，但SLA - 氮质量的y轴截距在大树中高于小型个体，这表明在给定的SLA下，大树在氮方面的投入更高。在氮质量 - A(质量)和SLA - A(质量)这两对性状中，小型个体比大树沿着共同斜率向上偏移，这与它们较大的A(质量)和SLA相对应。在给定的SLA下，小型个体沿着共同斜率向上偏移并不意味着它们比大树具有更高的光合氮利用效率（PNUE），因为在它们之间发现SLA - PNUE具有共同斜率且高度一致。磷质量 - A(质量)和氮质量 - 磷质量这些性状对呈正相关，且小型个体和大树之间的斜率不同。大树的磷质量 - A(质量)斜率比小型个体更陡，这表明在磷质量相同增加的情况下，大树会有不成比例的更大回报。然而，氮质量 - 磷质量的斜率模式与磷质量 - A(质量)所观察到的相反，这表明大树的氮/磷比高于小型个体。在给定的SLA下，大树比小型个体具有更高的光合磷利用效率（PPUE），这与它们的SLA - PPUE更高相对应。总之，叶片性状关系可因植株大小而改变，但SLA、氮质量、磷质量和A(质量)之间的正相关关系通常保持不变。（C）2009爱思唯尔马松公司。版权所有。
To test whether leaf trait relationships vary with plant size, specific leaf area (SLA), area- and mass-based leaf nutrient contents (N-area and N-mass, P-area and P-mass), and area- and mass-based leaf photosynthetic capacities (A(area) and A(mass)) of 127 small individuals (woody plants shorter than 2 m) and 47 large trees (taller than 10 m) were measured in a tropical montane rain forest, China. A standardized major axis (SMA) method was used to scale the mass-based trait relationships. We found that A(mass), P-area, P-mass, and SLA were higher in the small individuals than in the large trees, but the changes of A(area), N-area and N-mass leveled off. Trait pairs of N-mass - A(mass). SLA - A(mass) and N-mass - SLA were positively correlated with slopes in common, but the y-intercept of SLA - N-mass was higher in the large trees than in the small individuals, indicating large trees had a higher N investment at a given SLA. In the pairs of N-mass - A(mass) and SLA - A(mass), small individuals were shifted upwards along a common slope than large trees, corresponding to their large A(mass) and SLA. At a given SLA, the upwards shift along a common slope of small individuals does not mean that they have higher photosynthetic nitrogen use efficiency (PNUE) than large trees, since a common slope and homogenous elevations of SLA-PNUE were found between them. Trait pairs of P-mass - A(mass) and N-mass - P-mass were positively correlated and the slopes differed between small and large trees. The slope of P-mass - A(mass) was steeper in the large than in the small individuals, suggesting large trees would have a disproportionally larger return with the same increase in P-mass. However, the pattern of slope of N-mass - P-mass was the reverse of that observed for P-mass - A(mass), indicating a higher N/P ratio in the large than in the small individuals. At a given SLA, large trees had higher photosynthetic phosphorus use efficiency (PPUE) than small individuals, corresponding to their higher elevation of SLA-PPUE. In conclusion, leaf trait relationships can be modified by plant size but the positive correlations among SLA, N-mass, P-mass and A(mass) generally remain invariant. (C) 2009 Elsevier Masson SAS. All rights reserved.